Convertible Debentures And Revolving Credit Facility (Carrying Values Of The Liability And Equity Components Of Debentures) (Details) (USD $)	Jul. 02, 2011	Apr. 02, 2011		Jul. 02, 2011 2.625% Senior Convertible Debentures [Member]	Apr. 02, 2011 2.625% Senior Convertible Debentures [Member]	Jun. 30, 2010 2.625% Senior Convertible Debentures [Member]	Jul. 02, 2011 3.125% Junior Subordinated Convertible Debentures [Member]	Apr. 02, 2011 3.125% Junior Subordinated Convertible Debentures [Member]	Mar. 31, 2007 3.125% Junior Subordinated Convertible Debentures [Member]
Principal amount of Debentures				$ 600,000,000	$ 600,000,000	$ 600,000,000	$ 689,635,000	$ 689,635,000	$ 1,000,000,000
Unamortized discount of liability component				(91,969,000)	(95,855,000)		(328,848,000)	(329,941,000)
Hedge accounting adjustment - sale of interest rate swap				26,577,000	27,700,000
Unamortized discount of embedded derivative from date of issuance							(1,489,000)	(1,504,000)
Carrying value of liability component							359,298,000	358,190,000
Carrying value of embedded derivative component							572,000	945,000
Net carrying value of Debentures	894,478,000	890,980,000	[1]	534,608,000	531,845,000		359,870,000	359,135,000
Equity component - net carrying value				$ 105,620,000	$ 105,620,000		$ 229,513,000	$ 229,513,000

[1] Derived from audited financial statements