v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Sep. 29, 2018
Oct. 25, 2018
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 29, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Trading Symbol DCO  
Entity Registrant Name DUCOMMUN INC /DE/  
Entity Central Index Key 0000030305  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   11,410,277
Entity Emerging Growth Company false  
Entity Small Business false