Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								9 Months Ended	12 Months Ended			9 Months Ended	12 Months Ended			9 Months Ended	12 Months Ended			9 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 28, 2013	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Sep. 28, 2013 Severance and related	Dec. 29, 2012 Severance and related	Dec. 31, 2011 Severance and related	Dec. 28, 2013 Severance and related	Sep. 28, 2013 Lease termination	Dec. 29, 2012 Lease termination	Dec. 31, 2011 Lease termination	Dec. 28, 2013 Lease termination	Sep. 28, 2013 Other	Dec. 29, 2012 Other	Dec. 31, 2011 Other	Dec. 28, 2013 Other	Dec. 29, 2012 2012 Restructuring Plan	Dec. 28, 2013 2012 Restructuring Plan	Oct. 31, 2012 2012 Restructuring Plan employee	Jun. 30, 2012 2011 Restructuring Plan	Dec. 31, 2011 2011 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Approximate reduction in headcount																											110
Restructuring charges	$ 131	$ 85	$ 19	$ 153	$ 5,375	$ 0	$ 87	$ 556		$ 388	$ 6,018	$ 6,079													$ 5,400	$ 400		$ 700	$ 7,000
Benefit related to re-occupying leased space which had previously been restructured									198		118	996	150	104	175		(91)	14	821		139	0	0						800
Restructuring Reserve [Roll Forward]
Beginning Balance				3,424				1,582	3,424	3,424	1,582	1,202	2,373	1,556	175	17	793	26	1,014	368	258	0	13	147
Restructuring charges									586		6,136	7,344	109	4,277	6,503		224	1,083	11		253	776	830
Non-cash adjustments												(269)			(269)				0				0
Cash payments									(3,280)		(4,176)	(5,699)	(2,315)	(3,356)	(4,678)		(740)	(302)	(178)		(225)	(518)	(843)
Adjustments to prior restructuring costs									(198)		(118)	(996)	(150)	(104)	(175)		91	(14)	(821)		(139)	0	0						(800)
Ending Balance	$ 532				$ 3,424					$ 532	$ 3,424	$ 1,582		$ 2,373	$ 1,556	$ 17		$ 793	$ 26	$ 368		$ 258	$ 0	$ 147