Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance			$ 1,882
Restructuring charges	$ 1,972	$ 384	4,684	$ 2,137
Cash payments			(2,461)
Non-cash write-offs and other adjustments			(601)
Accrued expense ending balance	3,504		3,504
Severance
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance			1,358
Restructuring charges			2,563
Cash payments			(1,860)
Non-cash write-offs and other adjustments			(29)
Accrued expense ending balance	2,032		2,032
Facility Closing
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance			406
Restructuring charges			814
Cash payments			26
Non-cash write-offs and other adjustments			46
Accrued expense ending balance	1,292		1,292
Depreciation
Restructuring Cost And Reserve [Line Items]
Restructuring charges			616
Non-cash write-offs and other adjustments			(616)
Other Restructuring Charges
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance			118
Restructuring charges			691
Cash payments			(627)
Non-cash write-offs and other adjustments			(2)
Accrued expense ending balance	$ 180		$ 180