Realignment and reorganization costs System Optimization Accrual Rollforward (Details) - System Optimization [Member] - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 28, 2015		Jun. 29, 2014	Jun. 28, 2015		Jun. 29, 2014
Restructuring Reserve [Roll Forward]
Beginning balance				$ 2,804
Charges	$ 285		$ 1,276	735		$ 11,877
Payments				(2,851)
Ending balance	688			688
Severance and related employee costs [Member]
Restructuring Reserve [Roll Forward]
Beginning balance				2,235
Charges	303		393	629		5,926
Payments				(2,438)
Ending balance	426			426
Professional fees [Member]
Restructuring Reserve [Roll Forward]
Beginning balance				146
Charges	110		558	151		3,189
Payments				(159)
Ending balance	138			138
Other [Member]
Restructuring Reserve [Roll Forward]
Beginning balance				423
Charges	(128)	[1]	$ 325	(45)	[1]	$ 2,762
Payments				(254)
Ending balance	$ 124			$ 124

[1] The three and six months ended June 28, 2015 includes a reversal of an accrual of $210 as a result of a change in estimate.