Restructuring Charges - Restructuring Accrual Activity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Mar. 26, 2016	Jun. 25, 2016	Jun. 27, 2015
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		$ 2,000	$ 2,000	$ 584,000
Restructuring charges		0	6,910,000	500,000
Cash payments			(2,000)	(569,000)
Adjustment to restructuring charges				3,000
Non-cash settlement			(964,000)	(500,000)
Accrual at end of period	$ 5,946,000		5,946,000	18,000
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		2,000	2,000	584,000
Restructuring charges	500,000		5,946,000	0
Cash payments			(2,000)	(569,000)
Adjustment to restructuring charges				3,000
Non-cash settlement			0	0
Accrual at end of period	5,946,000		5,946,000	18,000
Stock-based Compensation
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		$ 0	0	0
Restructuring charges			964,000	500,000
Cash payments			0	0
Adjustment to restructuring charges				0
Non-cash settlement			(964,000)	(500,000)
Accrual at end of period	$ 0		$ 0	$ 0