Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2013	Dec. 29, 2012
Debt Instrument [Line Items]
Principal	$ 594,639	$ 494,639
Unamortized debt discount	(36,460)	(47,628)
Carrying value	100,000	0
Carrying value	558,179	447,011
Notes Due Twenty-Thirteen [Member]
Debt Instrument [Line Items]
Principal	144,461	144,461
Unamortized debt discount	(3,140)	(6,447)
Carrying value	141,321	138,014
Convertible Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Principal	350,000	350,000
Unamortized debt discount	(33,320)	(41,181)
Carrying value	316,680	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	100,000	0
Unamortized debt discount	0	0
Carrying value	$ 100,000	$ 0