Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended
	Sep. 27, 2014 Segment	Sep. 28, 2013 Inventory Valuation Ducommun LaBarge Technologies	Jun. 29, 2013 Inventory Valuation Ducommun LaBarge Technologies	Mar. 30, 2013 Inventory Valuation Ducommun LaBarge Technologies	Dec. 31, 2012 Inventory Valuation Ducommun LaBarge Technologies	Jul. 02, 2011 Inventory Valuation Ducommun LaBarge Technologies	Jul. 03, 2010 Inventory Valuation Ducommun LaBarge Technologies
Significant Accounting Policies [Line Items]
Number of reportable segments	2
Cash equivalent maturity period	3 months
Quantifying misstatement in current year financial statements, amount		$ 1.1	$ 0.1	$ 0.1	$ 0.1	$ 0.5	$ 0.3
Increase (decrease) in deferred tax assets	$ (0.6)