Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Convertible Debentures and Revolving Credit Facility (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Apr. 02, 2011	Mar. 31, 2012 2.625% Senior Convertible Debentures [Member]	Apr. 02, 2011 2.625% Senior Convertible Debentures [Member]	Jun. 30, 2010 2.625% Senior Convertible Debentures [Member]	Mar. 31, 2012 3.125% Debentures [Member]	Apr. 02, 2011 3.125% Debentures [Member]	Mar. 31, 2007 3.125% Debentures [Member]
Debt Instrument [Line Items]
Principal amount of Debentures			$ 600,000	$ 600,000	$ 600,000	$ 689,635	$ 689,635	$ 1,000,000
Unamortized discount of liability component			(80,311)	(95,855)		(325,448)	(329,941)
Hedge accounting adjustment - sale of interest rate swap			23,208	27,700
Unamortized discount of embedded derivative from date of issuance						(1,446)	(1,504)
Carrying value of liability component 3.125% Debentures						362,741	358,190
Carrying value of embedded derivative component						931	945
Net carrying value of the convertible debentures	906,569	890,980	542,897	531,845		363,672	359,135
Equity component - net carrying value			$ 105,620	$ 105,620		$ 229,513	$ 229,513