Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)	9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ (1,500,000)	$ (1,000,000)	$ (1,700,000)
Reclassifications from other comprehensive income		0
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	(500,000)	(500,000)
Post retirement benefit reserve adjustment net of tax expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	(1,000,000)	$ (500,000)
Herley
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications from other comprehensive income	$ 100,000.0