Convertible Debentures and Revolving Credit Facility (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Apr. 02, 2011	Apr. 03, 2010
Debt Instrument [Line Items]
Amortization of debt discount	$ 15,545	$ 13,921	$ 3,892
2.625% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Contractual coupon interest	15,750	12,863
Amortization of debt issuance costs	1,448	1,207
Amortization of debt discount	11,052	9,739
Total interest expense related to the debentures	28,250	23,809
3.125% Debentures [Member]
Debt Instrument [Line Items]
Contractual coupon interest	21,551	21,551	21,551
Amortization of debt issuance costs	223	223	223
Amortization of embedded derivative	58	58	58
Amortization of debt discount	4,493	4,182	3,892
Fair value adjustment of embedded derivative	(14)	97	(1,262)
Total interest expense related to the debentures	$ 26,311	$ 26,111	$ 24,462