Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Debt Instrument [Line Items]
Principal	$ 494,639	$ 494,639
Unamortized debt discount	(42,068)	(47,628)
Carrying value	452,571	447,011
Notes Due Twenty-Thirteen [Member]
Debt Instrument [Line Items]
Principal	144,461	144,461
Unamortized debt discount	(4,797)	(6,447)
Carrying value	139,664	138,014
Convertible Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Principal	350,000	350,000
Unamortized debt discount	(37,271)	(41,181)
Carrying value	312,729	308,819
Zero Coupon Zero Yield Senior Convertible Notes Due Two Zero Two Three [Member]
Debt Instrument [Line Items]
Principal	178	178
Unamortized debt discount	0	0
Carrying value	178	178
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal	0	0
Unamortized debt discount	0	0
Carrying value	$ 0	$ 0