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Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 28, 2020	Apr. 21, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 28, 2020
Document Transition Report	false
Entity File Number	001-08174
Entity Registrant Name	DUCOMMUN INCORPORATED
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-0693330
Entity Address, Address Line One	200 Sandpointe Avenue, Suite 700
Entity Address, City or Town	Santa Ana
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92707-5759
City Area Code	657
Local Phone Number	335-3665
Title of 12(b) Security	Common Stock, $.01 par value per share
Trading Symbol	DCO
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		11,648,725
Entity Central Index Key	0000030305
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 65,599	$ 39,584
Accounts receivable, net (allowance for credit losses of $1,418 and $1,321 at March 28, 2020 and December 31, 2019, respectively)	81,627	67,133
Contract assets	117,213	106,670
Inventories	119,751	112,482
Production cost of contracts	7,859	9,402
Other current assets	4,733	5,497
Total Current Assets	396,782	340,768
Property and Equipment, Net of Accumulated Depreciation of $158,711 and $162,920 at March 28, 2020 and December 31, 2019, respectively	114,732	115,216
Operating Lease Right-of-Use Assets	18,519	19,105
Goodwill	170,890	170,917
Intangibles, Net	134,532	138,362
Non-Current Deferred Income Taxes	60	55
Other Assets	6,322	6,006
Total Assets	841,837	790,429
Current Liabilities
Accounts payable	76,970	82,597
Contract liabilities	27,878	14,517
Accrued and other liabilities	28,048	37,620
Operating lease liabilities	3,049	2,956
Current portion of long-term debt	7,000	7,000
Total Current Liabilities	142,945	144,690
Long-Term Debt, Less Current Portion	343,625	300,887
Non-Current Operating Lease Liabilities	16,937	17,565
Non-Current Deferred Income Taxes	18,147	16,766
Other Long-Term Liabilities	17,756	17,721
Total Liabilities	539,410	497,629
Commitments and Contingencies (Notes 9, 11)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,648,617 and 11,572,668 shares issued and outstanding at March 28, 2020 and December 31, 2019, respectively	116	116
Additional paid-in capital	89,820	88,399
Retained earnings	220,483	212,553
Accumulated other comprehensive loss	(7,992)	(8,268)
Total Shareholders’ Equity	302,427	292,800
Total Liabilities and Shareholders’ Equity	$ 841,837	$ 790,429

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for credit loss	$ 1,418	$ 1,321
Property and equipment, accumulated depreciation	$ 158,711	$ 162,920
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	35,000,000	35,000,000
Common stock, shares issued (in shares)	11,648,617	11,572,668
Common Stock, shares outstanding (in shares)	11,648,617	11,572,668

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Income Statement [Abstract]
Net Revenues	$ 173,475	$ 172,566
Cost of Sales	136,671	136,872
Gross Profit	36,804	35,694
Selling, General and Administrative Expenses	23,178	22,846
Operating Income	13,626	12,848
Interest Expense	(4,246)	(4,351)
Income Before Taxes	9,380	8,497
Income Tax Expense	1,450	1,025
Net Income	$ 7,930	$ 7,472
Earnings Per Share
Basic earnings per share (in dollars per share)	$ 0.68	$ 0.65
Diluted earnings per share (in dollars per share)	$ 0.67	$ 0.64
Weighted-Average Number of Common Shares Outstanding
Basic (in shares)	11,610	11,434
Diluted (in shares)	11,855	11,755

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 7,930	$ 7,472
Other Comprehensive Income, Net of Tax:
Amortization of actuarial loss and prior service costs, net of tax of $59 and $51 for the three months ended March 28, 2020 and March 30, 2019, respectively	190	170
Change in unrealized gains and losses on cash flow hedges, net of tax of $26 and $54 for the three months ended March 28, 2020 and March 30, 2019, respectively	86	(84)
Other Comprehensive Income, Net of Tax	276	86
Comprehensive Income	$ 8,206	$ 7,558

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Statement of Comprehensive Income [Abstract]
Amortization of actuarial losses and prior service costs, tax benefits	$ 59	$ 51
Change in unrealized gains and losses on cash flow hedges, tax benefit	$ 26	$ 54

Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock Including Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2018		$ 83,826	$ 180,356	$ (7,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised		97
Stock awards vested		(1)
Stock repurchased related to the exercise of stock options		(1,901)
Stock-based compensation		1,464
Net Income	$ 7,472
Other Comprehensive Income, Net of Tax	86			86
Ending Balance at Mar. 30, 2019	263,778	83,485	187,564	(7,271)
Beginning Balance at Dec. 31, 2019	292,800	88,515	212,553	(8,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee Stock Purchase Plan		1,112
Stock options exercised		39
Stock awards vested		(1)
Stock repurchased related to the exercise of stock options		(2,008)
Stock-based compensation		2,279
Net Income	7,930
Other Comprehensive Income, Net of Tax	276			276
Ending Balance at Mar. 28, 2020	$ 302,427	$ 89,936	$ 220,483	$ (7,992)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Cash Flows from Operating Activities
Net Income	$ 7,930	$ 7,472
Net Cash Provided by Operating Activities:
Depreciation and amortization	7,336	6,755
Non-cash operating lease cost	811	633
Stock-based compensation expense	2,279	1,464
Deferred income taxes	1,495	217
Allowance for credit losses	97	104
Inventory reserves	398	154
Other	194	(19)
Changes in Assets and Liabilities:
Accounts receivable	(14,591)	4,581
Contract assets	(10,543)	(6,641)
Inventories	(7,667)	(3,023)
Production cost of contracts	973	105
Other assets	871	(468)
Accounts payable	(4,711)	(1,789)
Contract liabilities	13,361	(2,115)
Operating lease liabilities	(700)	(627)
Accrued and other liabilities	(9,567)	(8,492)
Net Cash Used in Operating Activities	(12,034)	(1,689)
Cash Flows from Investing Activities
Purchases of property and equipment	(3,867)	(3,225)
Post closing cash received from the acquisition of Nobles Worldwide, Inc., net	190	0
Net Cash Used in Investing Activities	(3,677)	(3,225)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	65,900	61,900
Repayments of senior secured revolving credit facility	(15,900)	(58,700)
Repayments of term loans	(7,362)	(3,000)
Repayments of other debt	(54)	(17)
Net cash paid upon issuance of common stock under stock plans	(858)	(1,805)
Net Cash Provided by (Used in) Financing Activities	41,726	(1,622)
Net Increase (Decrease) in Cash and Cash Equivalents	26,015	(6,536)
Cash and Cash Equivalents at Beginning of Period	39,584	10,263
Cash and Cash Equivalents at End of Period	$ 65,599	$ 3,727

Summary of Significant Accounting Policies

3 Months Ended

Mar. 28, 2020

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Description of Business

We are a leading global provider of engineering and manufacturing services for high-performance products and high-cost-of failure applications used primarily in the aerospace and defense (“A&D”), industrial, medical and other industries (collectively, “Industrial”). Our operations are organized into two primary businesses: Electronic Systems segment and Structural Systems segment, each of which is a reportable operating segment. Electronic Systems designs, engineers and manufactures high-reliability electronic and electromechanical products used in worldwide technology-driven markets including A&D and Industrial end-use markets. Electronic Systems’ product offerings primarily range from prototype development to complex assemblies. Structural Systems designs, engineers and manufactures large, complex contoured aerostructure components and assemblies and supplies composite and metal bonded structures and assemblies. Structural Systems’ products are primarily used on commercial aircraft, military fixed-wing aircraft, and military and commercial rotary-wing aircraft. All reportable operating segments follow the same accounting principles.

Basis of Presentation

The unaudited condensed consolidated financial statements include the accounts of Ducommun Incorporated and its subsidiaries (“Ducommun,” the “Company,” “we,” “us” or “our”), after eliminating intercompany balances and transactions. The December 31, 2019 condensed consolidated balance sheet data was derived from audited financial statements, but does not contain all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”).

Our significant accounting policies were described in Part IV, Item 15(a)(1), “Note 1. Summary of Significant Accounting Policies” in our Annual Report on Form 10-K for the year ended December 31, 2019. The financial information included in this Quarterly Report on Form 10-Q should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2019.

In the opinion of management, all adjustments, consisting of recurring accruals, have been made that are necessary to fairly state our condensed consolidated financial position, statements of income, comprehensive income and cash flows in accordance with GAAP for the periods covered by this Quarterly Report on Form 10-Q. The results of operations for the three months ended March 28, 2020 are not necessarily indicative of the results to be expected for the full year ending December 31, 2020.

Our fiscal quarters typically end on the Saturday closest to the end of March, June and September for the first three fiscal quarters of each year, and ends on December 31 for our fourth fiscal quarter. As a result of using fiscal quarters for the first three quarters combined with leap years, our first and fourth fiscal quarters can range between 12 1/2 weeks to 13 1/2 weeks while the second and third fiscal quarters remain at a constant 13 weeks per fiscal quarter.

Certain reclassifications have been made to prior period amounts to conform to the current year’s presentation.

Use of Estimates

Certain amounts and disclosures included in the unaudited condensed consolidated financial statements require management to make estimates and judgments that affect the amounts of assets, liabilities (including forward loss reserves), revenues and expenses, and related disclosures of contingent assets and liabilities. These estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates.Certain reclassifications have been made to prior period amounts to conform to the current year’s presentation.

Impact of the COVID-19 Pandemic

The commercial aerospace industry continues to be adversely affected by the impact from the continued grounding of the Boeing 737 MAX program combined with the outbreak of the COVID-19 pandemic which resulted in the announcements towards the end of our first quarter by two of our largest customers, The Boeing Company (“Boeing”) and Spirit Aerosystems Holdings, Inc. (“Spirit”), to temporarily shut down production at some of their facilities. While Boeing has resumed production at two of their manufacturing facilities subsequent to our quarter ended March 28, 2020, we expect there will be an impact to our condensed consolidated financial results for the second quarter of 2020. Given the uncertainties surrounding the duration and impact of these matters, we cannot reasonably estimate with certainty the related financial impact to our full year 2020 financial results; however, there could be a material adverse impact on our business, results of operations and financial condition for some portion, if not the remainder, of 2020.

Supplemental Cash Flow Information


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Interest paid	$	3,523	$	3,984
Taxes paid	$	33	$	5
Non-cash activities:
Purchases of property and equipment not paid	$	464	$	2,124

Earnings Per Share

Basic earnings per share are computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding in each period. Diluted earnings per share is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding, plus any potentially dilutive shares that could be issued if exercised or converted into common stock in each period.

The net income and weighted-average common shares outstanding used to compute earnings per share were as follows:


	(In thousands, except per share data)
	Three Months Ended
	March 28, 2020		March 30, 2019
Net income	$	7,930	$	7,472
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,610		11,434
Dilutive potential common shares	245		321
Diluted weighted-average common shares outstanding	11,855		11,755
Earnings per share
Basic	$	0.68	$	0.65
Diluted	$	0.67	$	0.64

Potentially dilutive stock awards to purchase common stock, as shown below, were excluded from the computation of diluted earnings per share because their inclusion would have been anti-dilutive. However, these shares may be potentially dilutive common shares in the future.

(In thousands)

Three Months Ended

March 28,
2020

March 30,
2019

Stock options and stock units

253

178

Fair Value

Assets and liabilities that are measured, recorded or disclosed at fair value on a recurring basis are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value. Level 1, the highest level, refers to the values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant observable inputs. Level 3, the lowest level, includes fair values estimated using significant unobservable inputs.

We have money market funds and they are included as cash and cash equivalents. We also have interest rate cap hedge agreements for which the fair value of the interest rate cap hedge agreements was determined using pricing models that use observable market inputs as of the balance sheet date, a Level 2 measurement. The interest rate cap hedge premium is zero as of March 28, 2020.

There were no transfers between Level 1, Level 2, or Level 3 financial instruments in the three months ended March 28, 2020.

Cash and Cash Equivalents

Cash equivalents consist of highly liquid instruments purchased with original maturities of three months or less. These assets are valued at cost, which approximates fair value, which we classify as Level 1. See Fair Value above.

Derivative Instruments

We recognize derivative instruments on our condensed consolidated balance sheets at their fair value. On the date that we enter into a derivative contract, we designate the derivative instrument as a fair value hedge, a cash flow hedge, a hedge of a net investment in a foreign operation, or a derivative instrument that will not be accounted for using hedge accounting methods. As of March 28, 2020, all of our derivative instruments were designated as cash flow hedges.

We record changes in the fair value of a derivative instrument that is highly effective and that is designated and qualifies as a cash flow hedge in other comprehensive income (loss), net of tax until our earnings are affected by the variability of cash flows of the underlying hedge. We record any hedge ineffectiveness and amounts excluded from effectiveness testing in current period earnings within interest expense. We report changes in the fair values of derivative instruments that are not designated or do not qualify for hedge accounting in current period earnings. We classify cash flows from derivative instruments in the condensed consolidated statements of cash flows in the same category as the item being hedged or on a basis consistent with the nature of the instrument. For the three months ended March 28, 2020, the impact of cash flow hedges in the respective periods were insignificant.

When we determine that a derivative instrument is not highly effective as a hedge, we discontinue hedge accounting prospectively. In all situations in which we discontinue hedge accounting and the derivative instrument remains outstanding, we will carry the derivative instrument at its fair value on our condensed consolidated balance sheets and recognize subsequent changes in its fair value in our current period earnings.

Inventories

Inventories are stated at the lower of cost or net realizable value with cost being determined using a moving average cost basis for raw materials and actual cost for work-in-process and finished goods. The majority of our inventory is charged to cost of sales as raw materials are placed into production and the related revenue is recognized. Inventoried costs include raw materials, outside processing, direct labor and allocated overhead, adjusted for any abnormal amounts of idle facility expense, freight, handling costs, and wasted materials (spoilage) incurred. We assess the inventory carrying value and reduce it, if necessary, to its net realizable value based on customer orders on hand, and internal demand forecasts using management’s best estimates given information currently available. The majority of our revenues are recognized over time, however, for revenue contracts where revenue is recognized using the point in time method, inventory is not reduced until it is shipped or transfer of control to the customer has occurred. Our ending inventory consists of raw materials, work-in-process, and finished goods.

Production Cost of Contracts

Production cost of contracts includes non-recurring production costs, such as design and engineering costs, and tooling and other special-purpose machinery necessary to build parts as specified in a contract. Production costs of contracts are recorded to cost of sales using the over time revenue recognition model. We review the value of the production cost of contracts on a quarterly basis to ensure when added to the estimated cost to complete, the value is not greater than the estimated realizable value of the related contracts.

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss, as reflected on the condensed consolidated balance sheets under the equity section, was comprised of cumulative pension and retirement liability adjustments, net of tax, and change in net unrealized gains and losses on cash flow hedges, net of tax.

Provision for Estimated Losses on Contracts

We record provisions for the total anticipated losses on contracts, considering total estimated costs to complete the contract compared to total anticipated revenues, in the period in which such losses are identified. The provisions for estimated losses on contracts require us to make certain estimates and assumptions, including those with respect to the future revenue under a contract and the future cost to complete the contract. Our estimate of the future cost to complete a contract may include assumptions as to changes in manufacturing efficiency, operating and material costs, and our ability to resolve claims and assertions with our customers. If any of these or other assumptions and estimates do not materialize in the future, we may be required to adjust the provisions for estimated losses on contracts. The provision for estimated losses on contracts is included as part of contract liabilities on the condensed consolidated balance sheets.

Revenue Recognition

Our customers typically engage us to manufacture products based on designs and specifications provided by the end-use customer. This requires the building of tooling and manufacturing first article inspection products (prototypes) before volume manufacturing. Contracts with our customers generally include a termination for convenience clause.

We have a significant number of contracts that are started and completed within the same year, as well as contracts derived from long-term agreements and programs that can span several years. We recognize revenue when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration to which we expect to be entitled to in exchange for those goods or services. We apply a five-step approach as defined in the new standard in determining the amount and timing of revenue to be recognized: (1) identifying the contract with a customer; (2) identifying the performance obligations in the contract; (3) determining the transaction price; (4) allocating the transaction price to the performance obligations in the contract; and (5) recognizing revenue when the corresponding performance obligation is satisfied.

Orders for our products generally correspond to the production schedules of our customers and are supported with purchase orders with firm fixed price and firm delivery dates. Our customers have continuous control of the work in progress and finished goods throughout the manufacturing process, as these are built to customer specifications with no alternative use, and there is an enforceable right to payment for work performed to date. As a result, we recognize revenue over time based on the extent of progress towards completion of the performance obligation. Revenue recognized is based on the cost-to-cost method as it best depicts the transfer of control to our customer which takes place as we incur costs. Under the cost-to-cost measure of progress, the extent of progress toward completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. Revenues are recorded proportionally as costs are incurred.

From time to time, we recognize revenue at a point in time upon transfer of control of the products to the customer. Point in time recognition was determined as the customer does not simultaneously receive or consume the benefits provided by our performance and the asset being manufactured has alternative uses to us.

Each distinct promise to transfer products is considered an identified performance obligation for which revenue is recognized upon transfer of control of the products to our customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of our contracts have a single performance obligation as the promise to transfer the individual good or service is not separately identifiable from other promises in the contract and is, therefore, not distinct.

As a significant change in one or more of these estimates could affect the profitability of our contracts, we review and update our contract-related estimates on a regular basis. We recognize adjustments in estimated profit on contracts under the cumulative catch-up method. Under this method, the impact of the adjustment on profit recorded to date is recognized in the period the adjustment is identified. Revenue and profit in future periods of contract performance is recognized using the adjusted estimate. If at any time the estimate of contract profitability indicates an anticipated loss on the contract, we recognize the total loss in the quarter it is identified. The impact of adjustments in contract estimates on our operating earnings can be reflected in either operating costs and expenses or revenue. Net cumulative catch up adjustments on profit recorded were not material during the three months ended for both March 28, 2020 and March 30, 2019.

Contract Assets and Contract Liabilities

Payments under long-term contracts may be received before or after revenue is recognized. When revenue is recognized before we bill our customer, a contract asset is created for the work performed but not yet billed. Similarly, when we receive payment before we ship our products to our customer, a contract liability is created for the advance or progress payment.

Contract assets consist of our right to payment for work performed but not yet billed. Contract assets are transferred to accounts receivable when we bill our customers. We bill our customers when we ship the products and meet the shipping terms within the revenue contract. Contract liabilities consist of advance or progress payments received from our customers prior to the time transfer of control occurs plus the estimated losses on contracts.

Contract assets and contract liabilities from revenue contracts with customers are as follows:


	(In thousands)
	March 28, 2020		December 31, 2019
Contract assets	$	117,213	$	106,670
Contract liabilities	$	27,878	$	14,517

Remaining performance obligations are defined as customer placed purchase orders (“POs”) with firm fixed price and firm delivery dates. Our remaining performance obligations as of March 28, 2020 totaled $726.8 million. We anticipate recognizing

an estimated 70% of our remaining performance obligations as revenue during the next 12 months with the remaining performance obligations being recognized in the remainder of 2021 and beyond.

Revenue by Category

In addition to the revenue categories disclosed above, the following table reflects our revenue disaggregated by major end-use market:


	(In thousands)
	Three Months Ended
	March 28 2020		March 30, 2019
Consolidated Ducommun
Military and space	$	100,820	$	76,661
Commercial aerospace	62,525		85,496
Industrial	10,130		10,409
Total	$	173,475	$	172,566

Electronic Systems
Military and space	$	73,238	$	60,387
Commercial aerospace	14,752		13,401
Industrial	10,130		10,409
Total	$	98,120	$	84,197

Structural Systems
Military and space	$	27,582	$	16,274
Commercial aerospace	47,773		72,095
Total	$	75,355	$	88,369

Recent Accounting Pronouncements

New Accounting Guidance Adopted in 2020

In March 2020, the FASB issued ASU 2020-03, “Codification Improvements to Financial Instruments” (“ASU 2020-03”), which provides clarity to, or address various specific issues, including modifications of debt instruments. The new guidance was effective upon issuance of this final accounting standards update. The adoption of this standard did not have a material impact on our condensed consolidated financial statements.

In February 2020, the FASB issued ASU 2020-02, “Financial Statements - Credit losses (Topic 326) and Leases (Topic 842) - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Relating to Accounting Standards Update No. 2016-02, Leases (Topic 842)” (“ASU 2020-02”), which provides guidance on the measurement and requirements related to credit losses. The new guidance was effective upon issuance of this final accounting standards update. The adoption of this standard did not have a material impact on our condensed consolidated financial statements.

In April 2019, the FASB issued ASU 2019-04, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Statements” (“ASU 2019-04”), which clarify, correct, and improve various aspects of the guidance in ASU 2016-01, ASU 2016-13, and ASU 2017-12. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which was our interim period beginning January 1, 2020. The adoption of this standard did not have a material impact on our condensed consolidated financial statements.

In March 2019, the FASB issued ASU 2019-01, “Leases (Topic 842): Codification Improvements” (“ASU 2019-01”), which addresses various lessor implementation issues and clarifies that lessees and lessors are exempt from certain interim disclosure requirements associated with the adoption of ASC 842. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which was our interim period beginning January 1, 2020. The adoption of this standard did not have a material impact on our condensed consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to

the Disclosure Requirements for Fair Value Measurement” (“ASU 2018-13”), which should improve the effectiveness of fair value measurement disclosures by removing certain requirements, modifying certain requirements, and adding certain new requirements. The new guidance was effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which was our interim period beginning January 1, 2020. Early adoption was permitted. The adoption of this standard did not have a material impact on our condensed consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”), which is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. ASU 2016-13 requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. These disclosures include qualitative and quantitative requirements that provide additional information about the amounts recorded in the financial statements. The new guidance was effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which was our interim period beginning January 1, 2020. The adoption of this standard did not have a material impact on our condensed consolidated financial statements.

Recently Issued Accounting Standards

In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”), which provides optional guidance for a limited time for contracts that reference London Interbank Offered Rate (“LIBOR”), to ease the potential burden in accounting for, or recognizing the effects, of reference rate reform on financial reporting as a result of the cessation of LIBOR. The new guidance is effective at any time after March 12, 2020 but no later than December 31, 2022. We are evaluating the impact of this standard.

In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes” (“ASU 2019-12”), which removes certain exceptions and provides guidance on various areas of tax accounting. The new guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2021. Early adoption is permitted. We are evaluating the impact of this standard.

In August 2018, the FASB issued ASU 2018-14, “Compensation - Retirement Benefits - Defined Benefit Plans - General (Topic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans” (“ASU 2018-14”), which will remove disclosures that no longer are considered cost-beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. The new guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2021. Early adoption is permitted. We are evaluating the impact of this standard.

Business Combinations

3 Months Ended

Mar. 28, 2020

Business Combinations [Abstract]

Business Combinations

In October 2019, we acquired 100.0% of the outstanding equity interests of Nobles Parent Inc., the parent company of Nobles Worldwide, Inc. (“Nobles”), a privately-held global leader in the design and manufacturing of high performance ammunition handling systems for a wide range of military platforms including fixed-wing aircraft, rotary-wing aircraft, ground vehicles, and shipboard systems. Nobles is located in St. Croix Falls, Wisconsin. The acquisition of Nobles advances our strategy to diversify and offer more customized, value-driven engineered products with aftermarket opportunities.

The original purchase price for Nobles was $77.0 million, net of cash acquired, all payable in cash. We paid a gross total aggregate of $77.3 million in cash upon the closing of the transaction. Subsequent to the closing of the transaction, during the three months ended March 28, 2020, we received $0.2 million back from the seller which lowered the purchase price to $76.8 million, net of cash acquired. We preliminarily allocated the gross purchase price of $77.1 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase price over the aggregate fair values of the net assets was recorded as goodwill. The allocation is subject to revision as the estimates of fair value of the assets acquired and liabilities assumed are based on preliminary information and are subject to refinement. We are in the process of reviewing third party valuation of the assets and liabilities. In addition, the purchase price is subject to finalization of the working capital amount.

The following table summarizes the preliminary estimated fair value of the assets acquired and liabilities assumed at the date of acquisition (in thousands):


	Estimated Fair Value
Cash	$	658
Accounts receivable	1,880
Inventories	2,866
Other current assets	288
Property and equipment	2,319
Intangible assets	37,200
Goodwill	34,833
Other non-current assets	675
Total assets acquired	80,719
Current liabilities	(2,187)
Net non-current deferred tax liability	(742)
Other non-current liabilities	(675)
Total liabilities assumed	(3,604)
Total purchase price allocation	$	77,115


	Useful Life (In years)	Estimated Fair Value (In thousands)
Intangible assets:
Customer relationships	15-16	$	34,200
Trade names and trademarks	15	3,000
		$	37,200

The intangible assets acquired of $37.2 million were preliminarily determined based on the estimated fair values using valuation techniques consistent with the income approach to measure fair value. The useful lives were estimated based on the underlying agreements or the future economic benefit expected to be received from the assets. The fair values of the identifiable intangible assets were estimated using several valuation methodologies, which represented Level 3 fair value measurements. The value for customer relationships was estimated based on a multi-period excess earnings approach, while the value for trade names and trademarks was assessed using the relief from royalty methodology.

The goodwill of $34.8 million arising from the acquisition is attributable to the benefits we expect to derive from expected synergies from the transaction, including complementary products that will enhance our overall product portfolio, opportunities within new markets, and an acquired assembled workforce. All the goodwill was assigned to the Structural Systems segment. The Nobles acquisition, for tax purposes, is also deemed a stock acquisition and thus, the goodwill recognized is not deductible for income tax purposes except for $6.7 million of pre-acquisition goodwill that is tax deductible.

Acquisition related transaction costs were not included as components of consideration transferred but have been expensed as incurred. Total acquisition-related transaction costs incurred by us were $0.8 million during 2019 and charged to selling, general and administrative expenses.

Nobles’ results of operations have been included in our condensed consolidated statements of income since the date of acquisition as part of the Structural Systems segment. Pro forma results of operations of the Nobles acquisition have not been presented as the effect of the Nobles acquisition was not material to our financial results.

Inventories

3 Months Ended

Mar. 28, 2020

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following:


	(In thousands)
	March 28, 2020		December 31, 2019
Raw materials and supplies	$	106,347	$	98,151
Work in process	10,026		10,887
Finished goods	3,378		3,444


Total	$	119,751	$	112,482

Leases

3 Months Ended

Mar. 28, 2020

Leases [Abstract]

Leases

We elected to utilize the following practical expedients that are permitted under ASC 842:

•As an accounting policy election by class of underlying asset, chose not to separate nonlease components from lease components and instead to account for each separate lease component and the nonlease components associated with that lease component as a single lease component; and

•As an accounting policy election chose not to apply the recognition requirements in ASC 842 to short term leases (a lease at commencement date has a lease term of 12 months or less and does not contain a purchase option that the lessee is reasonably certain to exercise).

We have operating and finance leases for manufacturing facilities, corporate offices, and various equipment. Our leases have remaining lease terms of 1 year to 11 years, some of which include options to extend the leases for up to 5 years, and some of which include options to terminate the leases within 1 year.

The components of lease expense were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Operating leases expense	$	1,008	963

Finance leases expense:
Amortization of right-of-use assets	$	60	$	45
Interest on lease liabilities	10		9
Total finance lease expense	$	70	$	54

Short term lease expense for the three months ended March 28, 2020 was not material.

Supplemental cash flow information related to leases were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,029	$	923
Operating cash flows from finance leases	$	10	$	9
Financing cash flows from finance leases	$	54	$	17

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	165	$	—
Finance leases	$	372	$	457

The weighted average remaining lease terms were as follows:


	(In years)
	Three Months Ended
	March 28, 2020	March 30, 2019
Operating leases	5	7
Finance leases	7	4

When a lease is identified, we recognize a right-of-use asset and a corresponding lease liability based on the present value of the lease payments over the lease term discounted using our incremental borrowing rate, unless an implicit rate is readily determinable. As the discount rate in our leases is usually not readily available, we use our own incremental borrowing rate as the discount rate. Our incremental borrowing rate is based on the interest rate on our term loan, which is a secured rate. The interest rate on our term loan is based on London Interbank Offered Rate (“LIBOR”) plus an applicable margin.

The weighted average discount rates were as follows:


	Three Months Ended
	March 28, 2020		March 30, 2019
Operating leases	6.5	%	6.5	%
Finance leases	5.3	%	6.5	%

Maturity of operating and finance lease liabilities are as follows:


	(In thousands)
	Operating Leases		Finance Leases
2020 (Excluding the three months ended March 28, 2020)	$	3,173	$	223
2021	4,177		284
2022	3,786		147
2023	3,454		108
2024	3,032		82
Thereafter	7,071		207
Total lease payments	24,693		1,051
Less imputed interest	4,707		81
Total	$	19,986	$	970

Operating lease payments include $11.6 million related to options to extend lease terms that are reasonably certain of being exercised. As of March 28, 2020, there are no legally binding minimum lease payments for leases signed but not yet commenced.

Finance lease payments related to options to extend lease terms that are reasonably certain of being exercised are not significant. As of March 28, 2020, it excludes $1.0 million of legally binding minimum lease payments for leases signed but not yet commenced. These finance leases will commence during 2020 with a lease term of 10 years.

Leases

We elected to utilize the following practical expedients that are permitted under ASC 842:

The components of lease expense were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Operating leases expense	$	1,008	963

Finance leases expense:
Amortization of right-of-use assets	$	60	$	45
Interest on lease liabilities	10		9
Total finance lease expense	$	70	$	54

Short term lease expense for the three months ended March 28, 2020 was not material.

Supplemental cash flow information related to leases were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,029	$	923
Operating cash flows from finance leases	$	10	$	9
Financing cash flows from finance leases	$	54	$	17

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	165	$	—
Finance leases	$	372	$	457

The weighted average remaining lease terms were as follows:


	(In years)
	Three Months Ended
	March 28, 2020	March 30, 2019
Operating leases	5	7
Finance leases	7	4

The weighted average discount rates were as follows:


	Three Months Ended
	March 28, 2020		March 30, 2019
Operating leases	6.5	%	6.5	%
Finance leases	5.3	%	6.5	%

Maturity of operating and finance lease liabilities are as follows:


	(In thousands)
	Operating Leases		Finance Leases
2020 (Excluding the three months ended March 28, 2020)	$	3,173	$	223
2021	4,177		284
2022	3,786		147
2023	3,454		108
2024	3,032		82
Thereafter	7,071		207
Total lease payments	24,693		1,051
Less imputed interest	4,707		81
Total	$	19,986	$	970

Goodwill

3 Months Ended

Mar. 28, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

We perform our annual goodwill impairment test as of the first day of the fourth quarter. If certain factors occur, including significant under performance of our business relative to expected operating results, significant adverse economic and industry trends, significant decline in our market capitalization for an extended period of time relative to net book value, a decision to divest individual businesses within a reporting unit, or a decision to group individual businesses differently, we may perform an impairment test prior to the fourth quarter.

As a result of the outbreak of the COVID-19 pandemic during the three months ended March 28, 2020, which impacts our business in the United States and the rest of the world, we assessed our goodwill for potential impairment indicators. The most recent goodwill impairment test for our Electronic Systems reporting unit was the annual goodwill impairment test as of the first day of the fourth quarter of 2019 where the fair value of our Electronic Systems reporting unit exceeded its carrying value by 44% and thus, goodwill was not deemed impaired at that time. For the first quarter of 2020, we performed a qualitative assessment including consideration of 1) margin of passing most recent Step 1 analysis, 2) earnings before interest, taxes, depreciation, and amortization, 3) long-term growth rate, 4) analyzing material adverse factors/changes between valuation

dates, 5) general macroeconomic factors, and 6) industry and market conditions. We determined it was not more likely than not that the fair value of a reporting unit is less than its carrying amount and thus, goodwill was not deemed impaired.

The most recent Step 1 goodwill impairment test for our Structural Systems reporting unit was April 2019, where the fair value of our Structural Systems reporting unit exceeded its carrying value by 85%. As such, for our annual goodwill impairment test as of the first day of the fourth quarter of 2019, we used a qualitative assessment and determined it was not more likely than not that the fair value of a reporting unit is less than its carrying amount and thus, goodwill was not deemed impaired at that time. For the first quarter of 2020, we performed a qualitative assessment including consideration of 1) margin of passing most recent step 1 analysis, 2) earnings before interest, taxes, depreciation, and amortization, 3) long-term growth rate, 4) analyzing material adverse factors/changes between valuation dates, 5) general macroeconomic factors, and 6) industry and market conditions. We determined it was not more likely than not that the fair value of a reporting unit is less than its carrying amount and thus, goodwill was not deemed impaired.

We acquired Nobles Worldwide, Inc. (“Nobles”) in October 2019 and recorded goodwill of $34.8 million in our Structural Systems segment. See Note 2.

The carrying amounts of our goodwill were as follows:



	Electronic Systems		Structural Systems		Consolidated Ducommun
Gross goodwill	$	199,157	$	53,482	$	252,639
Accumulated goodwill impairment	(81,722)		—		(81,722)
Balance at December 31, 2019	117,435		53,482		170,917
Purchase price allocation refinements	—		(27)		(27)
Balance at March 28, 2020	$	117,435	$	53,455	$	170,890

Accrued and Other Liabilities

3 Months Ended

Mar. 28, 2020

Payables and Accruals [Abstract]

Accrued and Other Liabilities

The components of accrued and other liabilities were as follows:


	(In thousands)
	March 28, 2020		December 31, 2019
Accrued compensation	$	20,201	$	31,342
Accrued income tax and sales tax	585		163



Other	7,262		6,115
Total	$	28,048	$	37,620

Long-Term Debt

3 Months Ended

Mar. 28, 2020

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt and the current period interest rates were as follows:


	(In thousands)
	March 28, 2020			December 31, 2019
Term loans	$	302,638		$	310,000
Revolving credit facility	50,000			—



Total debt	352,638			310,000
Less current portion	7,000			7,000
Total long-term debt, less current portion	345,638			303,000
Less debt issuance costs - term loans	2,013			2,113
Total long-term debt, net of debt issuance costs - term loans	$	343,625		$	300,887
Debt issuance costs - revolving credit facility ⁽¹⁾	$	1,799		$	1,894
Weighted-average interest rate	4.49		%	6.87		%

(1) Included as part of other assets.

On December 20, 2019, we completed the refinancing of a portion of our existing debt by entering into a new revolving credit facility (“New Revolving Credit Facility”) to replace the existing revolving credit facility that was entered into in November 2018 (“2018 Revolving Credit Facility”) and entering into a new term loan (“New Term Loan”). The New Revolving Credit Facility is a $100.0 million senior secured revolving credit facility that matures on December 20, 2024 replacing the $100.0 million 2018 Revolving Credit Facility that would have matured on November 21, 2023. The New Term Loan is a $140.0 million senior secured term loan that matures on December 20, 2024. We also have an existing $240.0 million senior secured term loan that was entered into in November 2018 that matures on November 21, 2025 (“2018 Term Loan”). The original amounts available under the New Revolving Credit Facility, New Term Loan, and 2018 Term Loan (collectively, the “Credit Facilities”) in aggregate, totaled $480.0 million.

The New Term Loan bears interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as the London Interbank Offered Rate [“LIBOR”] plus an applicable margin ranging from 1.50% to 2.50% per year) or (ii) the Base Rate (defined as the highest of [a] Federal Funds Rate plus 0.50%, [b] Bank of America’s prime rate, and [c] the Eurodollar Rate plus 1.00%) plus an applicable margin ranging from 0.50% to 1.50% per year, in each case based upon the consolidated total net adjusted leverage ratio, typically payable quarterly. In addition, the New Term Loan requires installment payments of 1.25% of the original outstanding principal balance of the New Term Loan amount on a quarterly basis.

The New Revolving Credit Facility bears interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as LIBOR) plus an applicable margin ranging from 1.50% to 2.50% per year or (ii) the Base Rate (defined as the highest of [a] Federal Funds Rate plus 0.50%, [b] Bank of America’s prime rate, and [c] the Eurodollar Rate plus 1.00%) plus an applicable margin ranging from 0.50% to 1.50% per year, in each case based upon the consolidated total net adjusted leverage ratio, typically payable quarterly. The undrawn portion of the commitment of the New Revolving Credit Facility is subject to a commitment fee ranging from 0.175% to 0.275%, based upon the consolidated total net adjusted leverage ratio.

The 2018 Term Loan bears interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as LIBOR plus an applicable margin ranging from 3.75% to 4.00% per year) or (ii) the Base Rate (defined as the highest of [a] Federal Funds Rate plus 0.50%, [b] Bank of America’s prime rate, and [c] the Eurodollar Rate plus 1.00%) plus an applicable margin ranging from 3.75% to 4.00% per year, in each case based upon the consolidated total net adjusted leverage ratio, typically payable quarterly. In addition, the 2018 Term Loan requires installment payments of 0.25% of the outstanding principal balance of the 2018 Term Loan amount on a quarterly basis.

Further, under the Credit Facilities, if we meet the annual excess cash flow threshold, we will be required to make excess flow payments. The annual mandatory excess cash flow payments will be based on (i) 50% of the excess cash flow amount if the adjusted leverage ratio is greater than 3.25 to 1.0, (ii) 25% of the excess cash flow amount if the adjusted leverage ratio is less than or equal to 3.25 to 1.0 but greater than 2.50 to 1.0, and (iii) zero percent of the excess cash flow amount if the adjusted leverage ratio is less than or equal to 2.50 to 1.0. During the three months ended March 28, 2020, we made the required 2019 annual excess cash flow payment of $7.4 million. As of March 28, 2020, we were in compliance with all covenants required under the Credit Facilities.

We have been making periodic voluntary principal prepayments on our credit facilities, however, during the three months ended March 28, 2020, as a result of drawing down $50.0 million on the New Revolving Credit Facility to hold as cash, we made no net aggregate voluntary prepayments.

In conjunction with entering into the New Revolving Credit Facility and the New Term Loan, we drew down the entire $140.0 million on the New Term Loan and used those proceeds to pay off and close the 2018 Revolving Credit Facility of $58.5 million, pay down a portion of the 2018 Term Loan of $56.0 million, pay the accrued interest associated with the amounts being paid down on the 2018 Revolving Credit Facility and 2018 Term Loan, pay the fees related to this transaction, and the remainder will be used for general corporate expenses. The New Revolving Credit Facility does not require any principal installment payments, however, the undrawn portion is subject to a commitment fee ranging from 0.175% to 0.275%, based upon the consolidated total net adjusted leverage ratio. The New Term Loan requires installment payments of 1.25% of the initial principal balance outstanding on a quarterly basis. The $56.0 million pay down paid all the required quarterly principal installment payments on the 2018 Term Loan until it matures.

The New Term Loan and 2018 Term Loan were considered a modification of debt and thus, no gain or loss was recorded. Instead, the new fees paid to the lenders of $0.6 million were capitalized and are being amortized over the life of the New Term Loan. The remaining debt issuance costs related to the 2018 Term Loan of $1.5 million will continue to be amortized over its remaining life.

The New Revolving Credit Facility that replaced the 2018 Revolving Credit Facility was considered an extinguishment of debt except for the portion related to the creditors that were part of both the New Revolving Credit Facility and the 2018 Revolving Credit Facility and in which case, it was considered a modification of debt. As a result, we expensed the portion of the unamortized debt issuance costs related to the 2018 Revolving Credit Facility that was considered an extinguishment of debt of $0.5 million. In addition, the new fees paid to the lenders of $0.5 million as part of the New Revolving Credit Facility were

capitalized and are being amortized over its remaining life. Further, the remaining debt issuance costs related to the 2018 Revolving Credit Facility of $1.1 million will also be amortized its remaining life.

In October 2019, we acquired 100.0% of the outstanding equity interests of Nobles for an original purchase price of $77.0 million, net of cash acquired, all payable in cash. Upon the closing of the transaction, we paid a gross total aggregate of $77.3 million in cash upon the closing of the transaction by drawing down on the 2018 Revolving Credit Facility. See Note 2.

As of March 28, 2020, we had $49.8 million of unused borrowing capacity under the Revolving Credit Facility, after deducting $0.2 million for standby letters of credit.

The Credit Facilities were entered into by us (“Parent Company”) and guaranteed by all of our domestic subsidiaries, other than two subsidiaries that were considered minor (“Subsidiary Guarantors”). The Subsidiary Guarantors jointly and severally guarantee the Credit Facilities. The Parent Company has no independent assets or operations and therefore, no consolidating financial information for the Parent Company and its subsidiaries are presented.

In October 2015, we entered into interest rate cap hedges designated as cash flow hedges with a portion of these interest rate cap hedges maturing on a quarterly basis, and a final quarterly maturity date of June 2020, and in aggregate, totaling $135.0 million of our debt. We paid a total of $1.0 million in connection with entering into the interest rate cap hedges. See Note 1 for further information.

Employee Benefit Plans

3 Months Ended

Mar. 28, 2020

Retirement Benefits [Abstract]

Employee Benefit Plans

The components of net periodic pension expense were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Service cost	$	155	$	126
Interest cost	302		347
Expected return on plan assets	(440)		(411)
Amortization of actuarial losses	249		221
Net periodic pension cost	$	266	$	283

The components of the reclassifications of net actuarial losses from accumulated other comprehensive loss to net income for the three months ended March 28, 2020 were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020
Amortization of actuarial losses - total before tax ⁽¹⁾	$	249
Tax benefit	(59)
Net of tax	$	190

(1)The amortization expense is included in the computation of periodic pension cost and is a decrease to net income upon reclassification from accumulated other comprehensive loss.

Indemnifications	3 Months Ended
Indemnifications	Mar. 28, 2020
Disclosure of Guarantees and Indemnifications [Abstract]
Indemnifications	Indemnifications We have made guarantees and indemnities under which we may be required to make payments to a guaranteed or indemnified party, in relation to certain transactions, including revenue transactions in the ordinary course of business. In connection with certain facility leases, we have indemnified our lessors for certain claims arising from our use of the facility under our lease. We indemnify our directors and officers to the maximum extent permitted under the laws of the State of Delaware. However, we have a directors and officers insurance policy that may reduce our exposure in certain circumstances and may enable us to recover a portion of future amounts that may be payable, if any. The duration of the guarantees and indemnities vary and, in many cases, are subject to statutes of limitations. The majority of guarantees and indemnities do not provide any limitations of the maximum potential future payments we could be obligated to make. Historically, payments related to these guarantees and indemnities have been immaterial. We estimate the amount of our indemnification obligations as insignificant based on this history and insurance coverage and therefore, have not recorded any liability for these guarantees and indemnities on the accompanying condensed consolidated balance sheets. Further, when considered with our insurance coverage, although recorded through different captions on our condensed consolidated balance sheets, the potential impact is further mitigated.

Income Taxes	3 Months Ended
Income Taxes	Mar. 28, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes is determined using an estimated annual effective tax rate, which is generally less than the U.S. federal statutory rate, primarily due to research and development (“R&D”) tax credits. Our effective tax rate may be subject to fluctuations during the year as new information is obtained, which may affect the assumptions used to estimate the annual effective tax rate, including factors such as expected utilization of R&D tax credits, valuation allowances against deferred tax assets, the recognition or derecognition of tax benefits related to uncertain tax positions, and changes in or the interpretation of tax laws in jurisdictions where we conduct business. Also, excess tax benefits and tax deficiencies related to our equity compensation recognized in the income statement could result in fluctuations in our effective tax rate period-over-period depending on the volatility of our stock price and how many awards vest in the period. We recognize deferred tax assets and liabilities, using enacted tax rates, for temporary differences between the financial reporting basis and the tax basis of our assets and liabilities along with net operating loss and tax credit carryovers. We record a valuation allowance against our deferred tax assets to reduce the net carrying value to an amount that we believe is more likely than not to be realized. When we establish or reduce our valuation allowances against our deferred tax assets, the provision for income taxes will increase or decrease, respectively, in the period when that determination is made. We recorded income tax expense of $1.5 million for the three months ended March 28, 2020 compared to $1.0 million for the three months ended March 30, 2019. The increase in income tax expense for the first quarter of 2020 compared to the first quarter of 2019 was primarily due to higher pre-tax income for the first quarter of 2020 compared to the first quarter of 2019. On March 27, 2020, the U.S. enacted the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) that provides tax relief to individuals and businesses affected by the coronavirus pandemic. We considered the provisions of the CARES Act and determined they do not have a material impact to our income taxes. Our total amount of unrecognized tax benefits was $5.8 million and $5.7 million as of March 28, 2020 and December 31, 2019, respectively. If recognized, $4.1 million would affect the effective tax rate. As a result of statute of limitations set to expire in the fourth quarter of 2020, we expect decreases to our unrecognized tax benefits of approximately $2.0 million in the next twelve months.

Contingencies	3 Months Ended
Contingencies	Mar. 28, 2020
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Structural Systems has been directed by California environmental agencies to investigate and take corrective action for groundwater contamination at its facilities located in El Mirage and Monrovia, California. Based on currently available information, Ducommun has established an accrual for its estimated liability for such investigation and corrective action of $1.5 million at both March 28, 2020 and December 31, 2019, which is reflected in other long-term liabilities on its condensed consolidated balance sheets. Structural Systems also faces liability as a potentially responsible party for hazardous waste disposed at landfills located in Casmalia and West Covina, California. Structural Systems and other companies and government entities have entered into consent decrees with respect to these landfills with the United States Environmental Protection Agency and/or California environmental agencies under which certain investigation, remediation and maintenance activities are being performed. Based on currently available information, Ducommun preliminarily estimates that the range of its future liabilities in connection with the landfill located in West Covina, California is between $0.4 million and $3.1 million. Ducommun has established an accrual for its estimated liability in connection with the West Covina landfill of $0.4 million at March 28, 2020, which is reflected in other long-term liabilities on its condensed consolidated balance sheet. Ducommun’s ultimate liability in connection with these matters will depend upon a number of factors, including changes in existing laws and regulations, the design and cost of construction, operation and maintenance activities, and the allocation of liability among potentially responsible parties. In the normal course of business, Ducommun and its subsidiaries are defendants in certain other litigation, claims and inquiries, including matters relating to environmental laws. In addition, Ducommun makes various commitments and incurs contingent liabilities in the ordinary course of business. While it is not feasible to predict the outcome of these matters, Ducommun does not presently expect that any sum it may be required to pay in connection with these matters would have a material adverse effect on its condensed consolidated financial position, results of operations or cash flows.

Business Segment Information

3 Months Ended

Mar. 28, 2020

Segment Reporting [Abstract]

Business Segment Information

We supply products and services primarily to the aerospace and defense industries. Our subsidiaries are organized into two strategic businesses, Electronic Systems and Structural Systems, each of which is a reportable operating segment.

Financial information by reportable operating segment was as follows:


	(In thousands) Three Months Ended
	March 28, 2020		March 30, 2019
Net Revenues
Electronic Systems	$	98,120	$	84,197
Structural Systems	75,355		88,369
Total Net Revenues	$	173,475	$	172,566
Segment Operating Income
Electronic Systems	$	15,122	$	9,181
Structural Systems	5,390		10,549
	20,512		19,730
Corporate General and Administrative Expenses ⁽¹⁾	(6,886)		(6,882)
Operating Income	$	13,626	$	12,848
Depreciation and Amortization Expenses
Electronic Systems	$	3,575	$	3,502
Structural Systems	3,689		3,000
Corporate Administration	72		253
Total Depreciation and Amortization Expenses	$	7,336	$	6,755
Capital Expenditures
Electronic Systems	$	815	$	836
Structural Systems	2,137		3,689
Corporate Administration	—		—
Total Capital Expenditures	$	2,952	$	4,525

(1)Includes costs not allocated to either the Electronic Systems or Structural Systems operating segments.

Segment assets include assets directly identifiable to or allocated to each segment. Our segment assets are as follows:


	(In thousands)
	March 28, 2020		December 31, 2019
Total Assets
Electronic Systems	$	431,562	$	411,981
Structural Systems	335,942		328,718
Corporate Administration ⁽¹⁾	74,333		49,730
Total Assets	$	841,837	$	790,429
Goodwill and Intangibles
Electronic Systems	$	208,097	$	210,453
Structural Systems	97,325		98,826
Total Goodwill and Intangibles	$	305,422	$	309,279

(1)Includes assets not specifically identified to or allocated to either the Electronic Systems or Structural Systems operating segments, including cash and cash equivalents.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 28, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements include the accounts of Ducommun Incorporated and its subsidiaries (“Ducommun,” the “Company,” “we,” “us” or “our”), after eliminating intercompany balances and transactions. The December 31, 2019 condensed consolidated balance sheet data was derived from audited financial statements, but does not contain all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). Our significant accounting policies were described in Part IV, Item 15(a)(1), “Note 1. Summary of Significant Accounting Policies” in our Annual Report on Form 10-K for the year ended December 31, 2019. The financial information included in this Quarterly Report on Form 10-Q should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2019. In the opinion of management, all adjustments, consisting of recurring accruals, have been made that are necessary to fairly state our condensed consolidated financial position, statements of income, comprehensive income and cash flows in accordance with GAAP for the periods covered by this Quarterly Report on Form 10-Q. The results of operations for the three months ended March 28, 2020 are not necessarily indicative of the results to be expected for the full year ending December 31, 2020. Our fiscal quarters typically end on the Saturday closest to the end of March, June and September for the first three fiscal quarters of each year, and ends on December 31 for our fourth fiscal quarter. As a result of using fiscal quarters for the first three quarters combined with leap years, our first and fourth fiscal quarters can range between 12 1/2 weeks to 13 1/2 weeks while the second and third fiscal quarters remain at a constant 13 weeks per fiscal quarter.
Use of Estimates	Use of Estimates Certain amounts and disclosures included in the unaudited condensed consolidated financial statements require management to make estimates and judgments that affect the amounts of assets, liabilities (including forward loss reserves), revenues and expenses, and related disclosures of contingent assets and liabilities. These estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates.Certain reclassifications have been made to prior period amounts to conform to the current year’s presentation.
Earnings Per Share	Earnings Per Share Basic earnings per share are computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding in each period. Diluted earnings per share is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding, plus any potentially dilutive shares that could be issued if exercised or converted into common stock in each period.
Fair Value	Fair Value Assets and liabilities that are measured, recorded or disclosed at fair value on a recurring basis are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value. Level 1, the highest level, refers to the values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant observable inputs. Level 3, the lowest level, includes fair values estimated using significant unobservable inputs. We have money market funds and they are included as cash and cash equivalents. We also have interest rate cap hedge agreements for which the fair value of the interest rate cap hedge agreements was determined using pricing models that use observable market inputs as of the balance sheet date, a Level 2 measurement.
Cash and Cash Equivalents	Cash and Cash EquivalentsCash equivalents consist of highly liquid instruments purchased with original maturities of three months or less. These assets are valued at cost, which approximates fair value, which we classify as Level 1.
Derivatives Instruments	Derivative Instruments We recognize derivative instruments on our condensed consolidated balance sheets at their fair value. On the date that we enter into a derivative contract, we designate the derivative instrument as a fair value hedge, a cash flow hedge, a hedge of a net investment in a foreign operation, or a derivative instrument that will not be accounted for using hedge accounting methods. As of March 28, 2020, all of our derivative instruments were designated as cash flow hedges. We record changes in the fair value of a derivative instrument that is highly effective and that is designated and qualifies as a cash flow hedge in other comprehensive income (loss), net of tax until our earnings are affected by the variability of cash flows of the underlying hedge. We record any hedge ineffectiveness and amounts excluded from effectiveness testing in current period earnings within interest expense. We report changes in the fair values of derivative instruments that are not designated or do not qualify for hedge accounting in current period earnings. We classify cash flows from derivative instruments in the condensed consolidated statements of cash flows in the same category as the item being hedged or on a basis consistent with the nature of the instrument. For the three months ended March 28, 2020, the impact of cash flow hedges in the respective periods were insignificant. When we determine that a derivative instrument is not highly effective as a hedge, we discontinue hedge accounting prospectively. In all situations in which we discontinue hedge accounting and the derivative instrument remains outstanding, we will carry the derivative instrument at its fair value on our condensed consolidated balance sheets and recognize subsequent changes in its fair value in our current period earnings.
Inventories	Inventories Inventories are stated at the lower of cost or net realizable value with cost being determined using a moving average cost basis for raw materials and actual cost for work-in-process and finished goods. The majority of our inventory is charged to cost of sales as raw materials are placed into production and the related revenue is recognized. Inventoried costs include raw materials, outside processing, direct labor and allocated overhead, adjusted for any abnormal amounts of idle facility expense, freight, handling costs, and wasted materials (spoilage) incurred. We assess the inventory carrying value and reduce it, if necessary, to its net realizable value based on customer orders on hand, and internal demand forecasts using management’s best estimates given information currently available. The majority of our revenues are recognized over time, however, for revenue contracts where revenue is recognized using the point in time method, inventory is not reduced until it is shipped or transfer of control to the customer has occurred. Our ending inventory consists of raw materials, work-in-process, and finished goods.
Production Cost of Contracts and Revenue Recognition	Production Cost of Contracts Production cost of contracts includes non-recurring production costs, such as design and engineering costs, and tooling and other special-purpose machinery necessary to build parts as specified in a contract. Production costs of contracts are recorded to cost of sales using the over time revenue recognition model. We review the value of the production cost of contracts on a quarterly basis to ensure when added to the estimated cost to complete, the value is not greater than the estimated realizable value of the related contracts. Revenue Recognition Our customers typically engage us to manufacture products based on designs and specifications provided by the end-use customer. This requires the building of tooling and manufacturing first article inspection products (prototypes) before volume manufacturing. Contracts with our customers generally include a termination for convenience clause. We have a significant number of contracts that are started and completed within the same year, as well as contracts derived from long-term agreements and programs that can span several years. We recognize revenue when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration to which we expect to be entitled to in exchange for those goods or services. We apply a five-step approach as defined in the new standard in determining the amount and timing of revenue to be recognized: (1) identifying the contract with a customer; (2) identifying the performance obligations in the contract; (3) determining the transaction price; (4) allocating the transaction price to the performance obligations in the contract; and (5) recognizing revenue when the corresponding performance obligation is satisfied. Orders for our products generally correspond to the production schedules of our customers and are supported with purchase orders with firm fixed price and firm delivery dates. Our customers have continuous control of the work in progress and finished goods throughout the manufacturing process, as these are built to customer specifications with no alternative use, and there is an enforceable right to payment for work performed to date. As a result, we recognize revenue over time based on the extent of progress towards completion of the performance obligation. Revenue recognized is based on the cost-to-cost method as it best depicts the transfer of control to our customer which takes place as we incur costs. Under the cost-to-cost measure of progress, the extent of progress toward completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. Revenues are recorded proportionally as costs are incurred. From time to time, we recognize revenue at a point in time upon transfer of control of the products to the customer. Point in time recognition was determined as the customer does not simultaneously receive or consume the benefits provided by our performance and the asset being manufactured has alternative uses to us. Each distinct promise to transfer products is considered an identified performance obligation for which revenue is recognized upon transfer of control of the products to our customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of our contracts have a single performance obligation as the promise to transfer the individual good or service is not separately identifiable from other promises in the contract and is, therefore, not distinct. As a significant change in one or more of these estimates could affect the profitability of our contracts, we review and update our contract-related estimates on a regular basis. We recognize adjustments in estimated profit on contracts under the cumulative catch-up method. Under this method, the impact of the adjustment on profit recorded to date is recognized in the period the adjustment is identified. Revenue and profit in future periods of contract performance is recognized using the adjusted estimate. If at any time the estimate of contract profitability indicates an anticipated loss on the contract, we recognize the total loss in the quarter it is identified. The impact of adjustments in contract estimates on our operating earnings can be reflected in either operating costs and expenses or revenue. Net cumulative catch up adjustments on profit recorded were not material during the three months ended for both March 28, 2020 and March 30, 2019. Contract Assets and Contract Liabilities Payments under long-term contracts may be received before or after revenue is recognized. When revenue is recognized before we bill our customer, a contract asset is created for the work performed but not yet billed. Similarly, when we receive payment before we ship our products to our customer, a contract liability is created for the advance or progress payment. Contract assets consist of our right to payment for work performed but not yet billed. Contract assets are transferred to accounts receivable when we bill our customers. We bill our customers when we ship the products and meet the shipping terms within the revenue contract. Contract liabilities consist of advance or progress payments received from our customers prior to the time transfer of control occurs plus the estimated losses on contracts. Remaining performance obligations are defined as customer placed purchase orders (“POs”) with firm fixed price and firm delivery dates. Our remaining performance obligations as of March 28, 2020 totaled $726.8 million. We anticipate recognizing an estimated 70% of our remaining performance obligations as revenue during the next 12 months with the remaining performance obligations being recognized in the remainder of 2021 and beyond.
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Accumulated other comprehensive loss, as reflected on the condensed consolidated balance sheets under the equity section, was comprised of cumulative pension and retirement liability adjustments, net of tax, and change in net unrealized gains and losses on cash flow hedges, net of tax.
Provision for Estimated Losses on Contracts	Provision for Estimated Losses on Contracts We record provisions for the total anticipated losses on contracts, considering total estimated costs to complete the contract compared to total anticipated revenues, in the period in which such losses are identified. The provisions for estimated losses on contracts require us to make certain estimates and assumptions, including those with respect to the future revenue under a contract and the future cost to complete the contract. Our estimate of the future cost to complete a contract may include assumptions as to changes in manufacturing efficiency, operating and material costs, and our ability to resolve claims and assertions with our customers. If any of these or other assumptions and estimates do not materialize in the future, we may be required to adjust the provisions for estimated losses on contracts. The provision for estimated losses on contracts is included as part of contract liabilities on the condensed consolidated balance sheets.
Recent Accounting Pronouncements and Recently Issued Accounting Standards	Recent Accounting Pronouncements New Accounting Guidance Adopted in 2020 In March 2020, the FASB issued ASU 2020-03, “Codification Improvements to Financial Instruments” (“ASU 2020-03”), which provides clarity to, or address various specific issues, including modifications of debt instruments. The new guidance was effective upon issuance of this final accounting standards update. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. In February 2020, the FASB issued ASU 2020-02, “Financial Statements - Credit losses (Topic 326) and Leases (Topic 842) - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Relating to Accounting Standards Update No. 2016-02, Leases (Topic 842)” (“ASU 2020-02”), which provides guidance on the measurement and requirements related to credit losses. The new guidance was effective upon issuance of this final accounting standards update. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. In April 2019, the FASB issued ASU 2019-04, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Statements” (“ASU 2019-04”), which clarify, correct, and improve various aspects of the guidance in ASU 2016-01, ASU 2016-13, and ASU 2017-12. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which was our interim period beginning January 1, 2020. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. In March 2019, the FASB issued ASU 2019-01, “Leases (Topic 842): Codification Improvements” (“ASU 2019-01”), which addresses various lessor implementation issues and clarifies that lessees and lessors are exempt from certain interim disclosure requirements associated with the adoption of ASC 842. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which was our interim period beginning January 1, 2020. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement” (“ASU 2018-13”), which should improve the effectiveness of fair value measurement disclosures by removing certain requirements, modifying certain requirements, and adding certain new requirements. The new guidance was effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which was our interim period beginning January 1, 2020. Early adoption was permitted. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”), which is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. ASU 2016-13 requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. These disclosures include qualitative and quantitative requirements that provide additional information about the amounts recorded in the financial statements. The new guidance was effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which was our interim period beginning January 1, 2020. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. Recently Issued Accounting Standards In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”), which provides optional guidance for a limited time for contracts that reference London Interbank Offered Rate (“LIBOR”), to ease the potential burden in accounting for, or recognizing the effects, of reference rate reform on financial reporting as a result of the cessation of LIBOR. The new guidance is effective at any time after March 12, 2020 but no later than December 31, 2022. We are evaluating the impact of this standard. In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes” (“ASU 2019-12”), which removes certain exceptions and provides guidance on various areas of tax accounting. The new guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2021. Early adoption is permitted. We are evaluating the impact of this standard. In August 2018, the FASB issued ASU 2018-14, “Compensation - Retirement Benefits - Defined Benefit Plans - General (Topic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans” (“ASU 2018-14”), which will remove disclosures that no longer are considered cost-beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. The new guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2021. Early adoption is permitted. We are evaluating the impact of this standard.

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 28, 2020

Accounting Policies [Abstract]

Schedule of Supplemental Cash Flow Information

Supplemental Cash Flow Information


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Interest paid	$	3,523	$	3,984
Taxes paid	$	33	$	5
Non-cash activities:
Purchases of property and equipment not paid	$	464	$	2,124

Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share

The net income and weighted-average common shares outstanding used to compute earnings per share were as follows:


	(In thousands, except per share data)
	Three Months Ended
	March 28, 2020		March 30, 2019
Net income	$	7,930	$	7,472
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,610		11,434
Dilutive potential common shares	245		321
Diluted weighted-average common shares outstanding	11,855		11,755
Earnings per share
Basic	$	0.68	$	0.65
Diluted	$	0.67	$	0.64

Weighted Average Number of Shares Outstanding Excluded from Computation of Diluted Earnings

(In thousands)

Three Months Ended

March 28,
2020

March 30,
2019

Stock options and stock units

253

178

Contract with Customer, Asset and Liability

Contract assets and contract liabilities from revenue contracts with customers are as follows:


	(In thousands)
	March 28, 2020		December 31, 2019
Contract assets	$	117,213	$	106,670
Contract liabilities	$	27,878	$	14,517

Disaggregation of Revenue

In addition to the revenue categories disclosed above, the following table reflects our revenue disaggregated by major end-use market:


	(In thousands)
	Three Months Ended
	March 28 2020		March 30, 2019
Consolidated Ducommun
Military and space	$	100,820	$	76,661
Commercial aerospace	62,525		85,496
Industrial	10,130		10,409
Total	$	173,475	$	172,566

Electronic Systems
Military and space	$	73,238	$	60,387
Commercial aerospace	14,752		13,401
Industrial	10,130		10,409
Total	$	98,120	$	84,197

Structural Systems
Military and space	$	27,582	$	16,274
Commercial aerospace	47,773		72,095
Total	$	75,355	$	88,369

Business Combinations (Tables)

3 Months Ended

Mar. 28, 2020

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The following table summarizes the preliminary estimated fair value of the assets acquired and liabilities assumed at the date of acquisition (in thousands):


	Estimated Fair Value
Cash	$	658
Accounts receivable	1,880
Inventories	2,866
Other current assets	288
Property and equipment	2,319
Intangible assets	37,200
Goodwill	34,833
Other non-current assets	675
Total assets acquired	80,719
Current liabilities	(2,187)
Net non-current deferred tax liability	(742)
Other non-current liabilities	(675)
Total liabilities assumed	(3,604)
Total purchase price allocation	$	77,115

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination


	Useful Life (In years)	Estimated Fair Value (In thousands)
Intangible assets:
Customer relationships	15-16	$	34,200
Trade names and trademarks	15	3,000
		$	37,200

Inventories (Tables)

3 Months Ended

Mar. 28, 2020

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following:


	(In thousands)
	March 28, 2020		December 31, 2019
Raw materials and supplies	$	106,347	$	98,151
Work in process	10,026		10,887
Finished goods	3,378		3,444


Total	$	119,751	$	112,482

Leases (Tables)

3 Months Ended

Mar. 28, 2020

Leases [Abstract]

Lease, Cost

The components of lease expense were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Operating leases expense	$	1,008	963

Finance leases expense:
Amortization of right-of-use assets	$	60	$	45
Interest on lease liabilities	10		9
Total finance lease expense	$	70	$	54

Supplemental cash flow information related to leases were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,029	$	923
Operating cash flows from finance leases	$	10	$	9
Financing cash flows from finance leases	$	54	$	17

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	165	$	—
Finance leases	$	372	$	457

The weighted average remaining lease terms were as follows:


	(In years)
	Three Months Ended
	March 28, 2020	March 30, 2019
Operating leases	5	7
Finance leases	7	4

The weighted average discount rates were as follows:


	Three Months Ended
	March 28, 2020		March 30, 2019
Operating leases	6.5	%	6.5	%
Finance leases	5.3	%	6.5	%

Finance Lease, Liability, Maturity

Maturity of operating and finance lease liabilities are as follows:


	(In thousands)
	Operating Leases		Finance Leases
2020 (Excluding the three months ended March 28, 2020)	$	3,173	$	223
2021	4,177		284
2022	3,786		147
2023	3,454		108
2024	3,032		82
Thereafter	7,071		207
Total lease payments	24,693		1,051
Less imputed interest	4,707		81
Total	$	19,986	$	970

Lessee, Operating Lease, Liability, Maturity

Maturity of operating and finance lease liabilities are as follows:


	(In thousands)
	Operating Leases		Finance Leases
2020 (Excluding the three months ended March 28, 2020)	$	3,173	$	223
2021	4,177		284
2022	3,786		147
2023	3,454		108
2024	3,032		82
Thereafter	7,071		207
Total lease payments	24,693		1,051
Less imputed interest	4,707		81
Total	$	19,986	$	970

Goodwill (Tables)

3 Months Ended

Mar. 28, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The carrying amounts of our goodwill were as follows:



	Electronic Systems		Structural Systems		Consolidated Ducommun
Gross goodwill	$	199,157	$	53,482	$	252,639
Accumulated goodwill impairment	(81,722)		—		(81,722)
Balance at December 31, 2019	117,435		53,482		170,917
Purchase price allocation refinements	—		(27)		(27)
Balance at March 28, 2020	$	117,435	$	53,455	$	170,890

Accrued and Other Liabilities (Tables)

3 Months Ended

Mar. 28, 2020

Payables and Accruals [Abstract]

Summary of Accrued Liabilities

The components of accrued and other liabilities were as follows:


	(In thousands)
	March 28, 2020		December 31, 2019
Accrued compensation	$	20,201	$	31,342
Accrued income tax and sales tax	585		163



Other	7,262		6,115
Total	$	28,048	$	37,620

Long-Term Debt (Tables)

3 Months Ended

Mar. 28, 2020

Debt Disclosure [Abstract]

Long Term Debt Summary

Long-term debt and the current period interest rates were as follows:


	(In thousands)
	March 28, 2020			December 31, 2019
Term loans	$	302,638		$	310,000
Revolving credit facility	50,000			—



Total debt	352,638			310,000
Less current portion	7,000			7,000
Total long-term debt, less current portion	345,638			303,000
Less debt issuance costs - term loans	2,013			2,113
Total long-term debt, net of debt issuance costs - term loans	$	343,625		$	300,887
Debt issuance costs - revolving credit facility ⁽¹⁾	$	1,799		$	1,894
Weighted-average interest rate	4.49		%	6.87		%

(1) Included as part of other assets.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 835
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Employee Benefit Plans (Tables)

3 Months Ended

Mar. 28, 2020

Retirement Benefits [Abstract]

Components of Net Periodic Pension Cost

The components of net periodic pension expense were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020		March 30, 2019
Service cost	$	155	$	126
Interest cost	302		347
Expected return on plan assets	(440)		(411)
Amortization of actuarial losses	249		221
Net periodic pension cost	$	266	$	283

Reclassification out of Accumulated Other Comprehensive Income

The components of the reclassifications of net actuarial losses from accumulated other comprehensive loss to net income for the three months ended March 28, 2020 were as follows:


	(In thousands)
	Three Months Ended
	March 28, 2020
Amortization of actuarial losses - total before tax ⁽¹⁾	$	249
Tax benefit	(59)
Net of tax	$	190

(1)The amortization expense is included in the computation of periodic pension cost and is a decrease to net income upon reclassification from accumulated other comprehensive loss.

Business Segment Information (Tables)

3 Months Ended

Mar. 28, 2020

Segment Reporting [Abstract]

Financial Information by Reportable Segment

Financial information by reportable operating segment was as follows:


	(In thousands) Three Months Ended
	March 28, 2020		March 30, 2019
Net Revenues
Electronic Systems	$	98,120	$	84,197
Structural Systems	75,355		88,369
Total Net Revenues	$	173,475	$	172,566
Segment Operating Income
Electronic Systems	$	15,122	$	9,181
Structural Systems	5,390		10,549
	20,512		19,730
Corporate General and Administrative Expenses ⁽¹⁾	(6,886)		(6,882)
Operating Income	$	13,626	$	12,848
Depreciation and Amortization Expenses
Electronic Systems	$	3,575	$	3,502
Structural Systems	3,689		3,000
Corporate Administration	72		253
Total Depreciation and Amortization Expenses	$	7,336	$	6,755
Capital Expenditures
Electronic Systems	$	815	$	836
Structural Systems	2,137		3,689
Corporate Administration	—		—
Total Capital Expenditures	$	2,952	$	4,525

(1)Includes costs not allocated to either the Electronic Systems or Structural Systems operating segments.

Segment Assets

Our segment assets are as follows:


	(In thousands)
	March 28, 2020		December 31, 2019
Total Assets
Electronic Systems	$	431,562	$	411,981
Structural Systems	335,942		328,718
Corporate Administration ⁽¹⁾	74,333		49,730
Total Assets	$	841,837	$	790,429
Goodwill and Intangibles
Electronic Systems	$	208,097	$	210,453
Structural Systems	97,325		98,826
Total Goodwill and Intangibles	$	305,422	$	309,279

(1)Includes assets not specifically identified to or allocated to either the Electronic Systems or Structural Systems operating segments, including cash and cash equivalents.

Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended
	Mar. 28, 2020 USD ($) Segment
Accounting Policies [Abstract]
Number of reportable segments \| Segment	2
Unamortized premium	$ 0
Remaining performance obligation	$ 726,800,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-03-29
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	70.00%
Remaining performance obligation, period	12 months

Summary of Significant Accounting Policies - Supplemental Cash Flow Items (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Supplemental Disclosures of Cash Flow Information
Interest paid	$ 3,523	$ 3,984
Taxes paid	33	5
Non-cash activities:
Purchases of property and equipment not paid	$ 464	$ 2,124

Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Accounting Policies [Abstract]
Net income	$ 7,930	$ 7,472
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)	11,610	11,434
Dilutive potential common shares (in shares)	245	321
Diluted weighted-average common shares outstanding (in shares)	11,855	11,755
Earnings per share
Basic (in dollars per share)	$ 0.68	$ 0.65
Diluted (in dollars per share)	$ 0.67	$ 0.64

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Excluded from Computation of Diluted Earnings (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Stock options and stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive stock options and stock units to purchase common stock (in shares)	253	178

Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Contract assets	$ 117,213	$ 106,670
Contract liabilities	$ 27,878	$ 14,517

Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 173,475	$ 172,566
Military and space
Disaggregation of Revenue [Line Items]
Revenue	100,820	76,661
Commercial Aerospace
Disaggregation of Revenue [Line Items]
Revenue	62,525	85,496
Industrial
Disaggregation of Revenue [Line Items]
Revenue	10,130	10,409
Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	98,120	84,197
Electronic Systems \| Military and space
Disaggregation of Revenue [Line Items]
Revenue	73,238	60,387
Electronic Systems \| Commercial Aerospace
Disaggregation of Revenue [Line Items]
Revenue	14,752	13,401
Electronic Systems \| Industrial
Disaggregation of Revenue [Line Items]
Revenue	10,130	10,409
Structural Systems
Disaggregation of Revenue [Line Items]
Revenue	75,355	88,369
Structural Systems \| Military and space
Disaggregation of Revenue [Line Items]
Revenue	27,582	16,274
Structural Systems \| Commercial Aerospace
Disaggregation of Revenue [Line Items]
Revenue	$ 47,773	$ 72,095

Business Combinations - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Oct. 08, 2019	Mar. 28, 2020	Mar. 30, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Proceeds from previous acquisition		$ 190	$ 0
Goodwill		170,890		$ 170,917
Nobles Worldwide, Inc.
Business Acquisition [Line Items]
Percentage of outstanding common stock acquired	100.00%
Purchase price of acquisition	$ 77,000	76,800
Payments to acquire business	77,300
Proceeds from previous acquisition		200
Purchase price allocation, fair value	77,115
Intangible assets	37,200
Goodwill	$ 34,833
Goodwill, expected tax deductible amount		$ 6,700
Acquisition related costs				$ 800

Business Combinations - Fair Value of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019	Oct. 08, 2019
Business Acquisition [Line Items]
Goodwill	$ 170,890	$ 170,917
Nobles Worldwide, Inc.
Business Acquisition [Line Items]
Cash			$ 658
Accounts receivable			1,880
Inventories			2,866
Other current assets			288
Property and equipment			2,319
Intangible assets			37,200
Goodwill			34,833
Other assets			675
Total assets acquired			80,719
Current liabilities			(2,187)
Net non-current deferred tax liability			(742)
Other non-current liabilities			(675)
Total liabilities assumed			(3,604)
Total purchase price allocation			$ 77,115

Business Combinations - Estimated Fair Value of Intangible Assets Acquired (Details) - Nobles Worldwide, Inc. $ in Thousands	Oct. 08, 2019 USD ($)
Business Acquisition [Line Items]
Intangible assets	$ 37,200
Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 34,200
Trade names and trademarks
Business Acquisition [Line Items]
Useful life (in years)	15 years
Intangible assets	$ 3,000
Minimum \| Customer relationships
Business Acquisition [Line Items]
Useful life (in years)	15 years
Maximum \| Customer relationships
Business Acquisition [Line Items]
Useful life (in years)	16 years

Inventories (Detail) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 106,347	$ 98,151
Work in process	10,026	10,887
Finished goods	3,378	3,444
Total	$ 119,751	$ 112,482

Leases - Narrative (Details)	3 Months Ended
Leases - Narrative (Details)	Mar. 28, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Lease termination period	1 year
Payments due with option to extend	$ 11,600,000
Operating lease, lease not yet commenced, amount	0
Finance lease, lease not yet commenced, amount	$ 1,000,000.0
Finance lease, lease not yet commenced, term of contract	10 years
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	11 years

Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended
Leases - Lease Costs (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Mar. 30, 2019
Leases [Abstract]
Operating leases expense	$ 1,008	$ 963
Finance leases expense:
Amortization of right-of-use assets	60	45
Interest on lease liabilities	10	9
Total finance lease expense	$ 70	$ 54

Leases - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 1,029	$ 923
Operating cash flows from finance leases	10	9
Financing cash flows from finance leases	54	17
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	165	0
Finance leases	$ 372	$ 457

Leases - Weighted Average Remaining Lease Term and Discount Rate (Details)	Mar. 28, 2020	Mar. 30, 2019
Weighted Average Lease Term
Operating leases	5 years	7 years
Finance leases	7 years	4 years
Weighted Average Discount Rate
Operating leases	6.50%	6.50%
Finance leases	5.30%	6.50%

Leases - Undiscounted Cash Flows (Details) $ in Thousands	Mar. 28, 2020 USD ($)
Operating Leases
2020 (Excluding the three months ended March 28, 2020)	$ 3,173
2020	4,177
2021	3,786
2022	3,454
2023	3,032
Thereafter	7,071
Total lease payments	24,693
Less imputed interest	4,707
Total	19,986
Finance Leases
2020 (Excluding the three months ended March 28, 2020)	223
2020	284
2021	147
2022	108
2023	82
Thereafter	207
Total lease payments	1,051
Less imputed interest	81
Total	$ 970

Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
Goodwill (Detail) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019	Oct. 08, 2019
Goodwill [Line Items]
Gross goodwill		$ 252,639
Accumulated goodwill impairment		(81,722)
Purchase price allocation refinements	$ (27)
Goodwill	$ 170,890	170,917
Electronic Systems
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	44.00%
Gross goodwill		199,157
Accumulated goodwill impairment		(81,722)
Purchase price allocation refinements	$ 0
Goodwill	$ 117,435	117,435
Structural Systems
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	85.00%
Gross goodwill		53,482
Accumulated goodwill impairment		0
Purchase price allocation refinements	$ (27)
Goodwill	$ 53,455	$ 53,482
Nobles Worldwide, Inc.
Goodwill [Line Items]
Goodwill			$ 34,833
Nobles Worldwide, Inc. \| Structural Systems
Goodwill [Line Items]
Goodwill			$ 34,800

Accrued and Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued compensation	$ 20,201	$ 31,342
Accrued income tax and sales tax	585	163
Other	7,262	6,115
Total	$ 28,048	$ 37,620

Long-Term Debt - Summary (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 352,638	$ 310,000
Less current portion	7,000	7,000
Total long-term debt, less current portion	345,638	303,000
Less debt issuance costs - term loans	2,013	2,113
Total long-term debt, net of debt issuance costs - term loans	$ 343,625	$ 300,887
Weighted-average interest rate (percent)	4.49%	6.87%
Term loans
Debt Instrument [Line Items]
Long-term debt	$ 302,638	$ 310,000
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	50,000	0
Less debt issuance costs - term loans	$ 1,799	$ 1,894

Long-Term Debt - Narrative (Details)			1 Months Ended	3 Months Ended		12 Months Ended
Long-Term Debt - Narrative (Details)	Dec. 20, 2019 USD ($)	Oct. 08, 2019 USD ($)	Oct. 31, 2015 USD ($)	Mar. 28, 2020 USD ($) subsidiary	Mar. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Repayments of secured debt				$ 7,362,000	$ 3,000,000
Interest Rate Cap
Debt Instrument [Line Items]
Interest rate hedge			$ 135,000,000.0
Payments made for interest rate hedge			$ 1,000,000.0
Credit Facilities
Debt Instrument [Line Items]
Debt amount	$ 480,000,000.0
New Credit Facilities
Debt Instrument [Line Items]
Number of subsidiaries that are not guarantors on debt \| subsidiary				2
Nobles Worldwide, Inc.
Debt Instrument [Line Items]
Percentage of outstanding common stock acquired		100.00%
Purchase price of acquisition		$ 77,000,000.0		$ 76,800,000
Payments to acquire business		$ 77,300,000
Revolving Credit Facility \| New Revolving Credit Facility Due December 20, 2024
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100,000,000.0
Proceeds from lines of credit				50,000,000.0
Revolving Credit Facility \| New Revolving Credit Facility Due December 20, 2024 \| Minimum
Debt Instrument [Line Items]
Commitment fee	0.175%
Revolving Credit Facility \| New Revolving Credit Facility Due December 20, 2024 \| Maximum
Debt Instrument [Line Items]
Commitment fee	0.275%
Revolving Credit Facility \| New Revolving Credit Facility Due December 20, 2024 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	1.50%
Revolving Credit Facility \| New Revolving Credit Facility Due December 20, 2024 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Spread on variable rate	2.50%
Revolving Credit Facility \| New Revolving Credit Facility Due December 20, 2024 \| Federal Funds Rate
Debt Instrument [Line Items]
Spread on variable rate	0.50%
Revolving Credit Facility \| New Revolving Credit Facility Due December 20, 2024 \| Eurodollar Rate
Debt Instrument [Line Items]
Spread on base rate	1.00%
Revolving Credit Facility \| New Revolving Credit Facility Due December 20, 2024 \| Base Rate \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	0.50%
Revolving Credit Facility \| New Revolving Credit Facility Due December 20, 2024 \| Base Rate \| Maximum
Debt Instrument [Line Items]
Spread on variable rate	1.50%
Revolving Credit Facility \| 2018 Revolving Credit Facility Maturing November 21, 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 100,000,000.0
Percentage of excess cash flow payment when leverage ratio is greater than 3.25						50.00%
Percentage of excess cash flow payment when leverage ratio is less than or equal to 3.25 but greater than 2.50						25.00%
Percentage of excess cash flow payment when leverage ratio is less than or equal to 2.50						0.00%
Repayments of lines of credit	$ 58,500,000
Fees paid to lenders to be capitalized				500,000
Amortization of debt issuance costs				500,000
Debt issuance costs, line of credit arrangements				1,100,000
Revolving Credit Facility \| 2018 Term Loan
Debt Instrument [Line Items]
Fees paid to lenders to be capitalized				1,500,000
Revolving Credit Facility \| New Credit Facilities
Debt Instrument [Line Items]
Remaining borrowing capacity				49,800,000
Outstanding standby letters of credit				200,000
Secured Debt \| New Term Loan Maturing December 20, 2024
Debt Instrument [Line Items]
Debt amount	$ 140,000,000.0
Prepayment amount of principal outstanding	1.25%
Proceeds from lines of credit	$ 140,000,000.0
Fees paid to lenders to be capitalized				600,000
Secured Debt \| New Term Loan Maturing December 20, 2024 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	1.50%
Secured Debt \| New Term Loan Maturing December 20, 2024 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Spread on variable rate	2.50%
Secured Debt \| New Term Loan Maturing December 20, 2024 \| Federal Funds Rate
Debt Instrument [Line Items]
Spread on variable rate	0.50%
Secured Debt \| New Term Loan Maturing December 20, 2024 \| Eurodollar Rate
Debt Instrument [Line Items]
Spread on base rate	1.00%
Secured Debt \| New Term Loan Maturing December 20, 2024 \| Base Rate \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	0.50%
Secured Debt \| New Term Loan Maturing December 20, 2024 \| Base Rate \| Maximum
Debt Instrument [Line Items]
Spread on variable rate	1.50%
Secured Debt \| 2018 Term Loan
Debt Instrument [Line Items]
Debt amount	$ 240,000,000.0
Prepayment amount of principal outstanding	0.25%
Repayments of debt	$ 56,000,000.0
Secured Debt \| 2018 Term Loan \| LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	3.75%
Secured Debt \| 2018 Term Loan \| LIBOR \| Maximum
Debt Instrument [Line Items]
Spread on variable rate	4.00%
Secured Debt \| 2018 Term Loan \| Federal Funds Rate
Debt Instrument [Line Items]
Spread on variable rate	0.50%
Secured Debt \| 2018 Term Loan \| Eurodollar Rate
Debt Instrument [Line Items]
Spread on base rate	1.00%
Secured Debt \| 2018 Term Loan \| Base Rate \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	3.75%
Secured Debt \| 2018 Term Loan \| Base Rate \| Maximum
Debt Instrument [Line Items]
Spread on variable rate	4.00%
Secured Debt \| Credit Facilities
Debt Instrument [Line Items]
Repayments of secured debt				$ 7,400,000

Employee Benefit Plans - Components of Net Periodic Pension Cost for Defined Benefit Pension Plan and Retirement Plan (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 155	$ 126
Interest cost	302	347
Expected return on plan assets	(440)	(411)
Amortization of actuarial losses	249	221
Net periodic pension cost	$ 266	$ 283

Employee Benefit Plans - Reclassifications from Accumulated Other Comprehensive Income (Detail) $ in Thousands	3 Months Ended
	Mar. 28, 2020 USD ($)
Retirement Benefits [Abstract]
Amortization of actuarial loss - total before tax	$ 249
Tax benefit	(59)
Net of tax	$ 190

Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Detail) - USD ($) $ in Thousands	Mar. 28, 2020	Mar. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 1,450	$ 1,025
Unrecognized tax benefits	5,800		$ 5,700
Expected change in unrecognized tax benefits	4,100
Decrease in unrecognized tax benefits in next twelve months	$ 2,000

Contingencies (Detail) - Structural Systems - USD ($) $ in Millions	Mar. 28, 2020	Dec. 31, 2019
El Mirage and Monrovia, California
Loss Contingencies [Line Items]
Reserve for estimated liability	$ 1.5	$ 1.5
West Covina, California
Loss Contingencies [Line Items]
Reserve for estimated liability	0.4
Minimum \| West Covina, California
Loss Contingencies [Line Items]
Possible loss	0.4
Maximum \| West Covina, California
Loss Contingencies [Line Items]
Possible loss	$ 3.1

Business Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 28, 2020 Segment
Segment Reporting [Abstract]
Number of reportable segments	2

Business Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Segment Reporting Information [Line Items]
Net Revenues	$ 173,475	$ 172,566
Operating Income	13,626	12,848
Depreciation and Amortization Expenses	7,336	6,755
Capital Expenditures	2,952	4,525
Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues	98,120	84,197
Structural Systems
Segment Reporting Information [Line Items]
Net Revenues	75,355	88,369
Operating Segments
Segment Reporting Information [Line Items]
Operating Income	20,512	19,730
Operating Segments \| Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues	98,120	84,197
Operating Income	15,122	9,181
Depreciation and Amortization Expenses	3,575	3,502
Capital Expenditures	815	836
Operating Segments \| Structural Systems
Segment Reporting Information [Line Items]
Net Revenues	75,355	88,369
Operating Income	5,390	10,549
Depreciation and Amortization Expenses	3,689	3,000
Capital Expenditures	2,137	3,689
Segment Reconciling Items
Segment Reporting Information [Line Items]
Corporate General and Administrative Expenses	(6,886)	(6,882)
Corporate Administration
Segment Reporting Information [Line Items]
Depreciation and Amortization Expenses	72	253
Capital Expenditures	$ 0	$ 0

Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total Assets	$ 841,837	$ 790,429
Total Goodwill and Intangibles	305,422	309,279
Operating Segments \| Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	431,562	411,981
Total Goodwill and Intangibles	208,097	210,453
Operating Segments \| Structural Systems
Segment Reporting Information [Line Items]
Total Assets	335,942	328,718
Total Goodwill and Intangibles	97,325	98,826
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 74,333	$ 49,730

Label	Element	Value
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (264,000)