Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended								3 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013 Severance and related	Sep. 29, 2012 Severance and related	Sep. 28, 2013 Lease termination	Sep. 29, 2012 Lease termination	Sep. 28, 2013 Other	Sep. 29, 2012 Other	Jun. 29, 2013 2012 restructuring plan	Oct. 31, 2012 2012 restructuring plan employee
Restructuring Cost and Reserve [Line Items]
Approximate reduction in headcount												110
Recorded restructuring charges - less than	$ 85	$ 0	$ 257	$ 643							$ 100
Restructuring Reserve [Roll Forward]
Balance at beginning of the period			3,424	1,569	2,373	1,543	793	26	258	0
Restructuring charges			574	761	105	296	224	0	245	465
Cash payments			(3,103)	(2,212)	(2,312)	(1,735)	(571)	(12)	(220)	(465)
Adjustments to prior restructuring costs			(317)	(118)	(150)	(104)	(99)	(14)	(68)	0
Balance at the end of the period	$ 578	$ 0	$ 578	$ 0	$ 16	$ 0	$ 347	$ 0	$ 215	$ 0