Convertible Debentures and Revolving Credit Facility (Details) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2013	Mar. 30, 2013		Jun. 30, 2010
Debt Instrument [Line Items]
Convertible debentures	$ 926,781	$ 0	[1]
2.625% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Principal amount of Debentures	600,000	600,000		600,000
Unamortized discount of liability component	(60,881)	(64,767)
Hedge Accounting Adjustment - Sale Of Interest Rate Swap	17,593	18,716
Carrying value of liability component	556,712	553,949
Equity component - net carrying value	66,415	66,415
3.125% Junior Convertible Debentures [Member]
Debt Instrument [Line Items]
Principal amount of Debentures	689,635	689,635
Unamortized discount of liability component	(319,358)	(320,620)
Unamortized discount of embedded derivative from date of issuance	(1,373)	(1,388)
Carrying value of liability component	368,904	367,627
Carrying value of embedded derivative component	1,165	1,090
Convertible debentures	370,069	368,717
Equity component - net carrying value	$ 229,513	$ 229,513

[1] Derived from audited financial statements