Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)	6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Dec. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ (1,600,000)	$ (900,000)	$ (1,700,000)
Reclassifications from other comprehensive income	0	0
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	(600,000)	(400,000)
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)