Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance			$ 1,272
Restructuring charges	233	1,447	73	3,532
Cash payments			(765)
Non-cash write-offs and other adjustments			(374)
Accrued expense ending balance	206		206
Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance			585
Restructuring charges			(79)
Cash payments			(441)
Accrued expense ending balance	65		65
Facility
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance			648
Restructuring charges			68
Cash payments			(249)
Non-cash write-offs and other adjustments			(374)
Accrued expense ending balance	93		93
Other Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance			39
Restructuring charges			84
Cash payments			(75)
Accrued expense ending balance	$ 48		$ 48