Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2015	Jun. 27, 2014	Jul. 03, 2015	Jun. 27, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense – cost of revenue	$ 1,174	$ 1,614	$ 2,293	$ 2,915
Amortization expense – operating expenses	1,852	2,876	3,741	4,620
Total amortization expense	$ 3,026	$ 4,490	$ 6,034	$ 7,535