Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014 Severance and related	Mar. 30, 2013 Severance and related	Mar. 29, 2014 Lease termination	Mar. 30, 2013 Lease termination	Mar. 29, 2014 Other	Mar. 30, 2013 Other	Mar. 30, 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	$ 11	$ 153							$ 200
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	532	3,424	17	2,373	368	793	147	258
Restructuring charges	9	153	0	30	0	19	9	104
Cash payments	(290)	(2,134)	(8)	(1,767)	(266)	(196)	(16)	(171)
Adjustments to prior restructuring costs	2	0	(9)		11	0	0	0
Balance at the end of the period	$ 253	$ 1,443	$ 0	$ 636	$ 113	$ 616	$ 140	$ 191