Convertible Debentures and Revolving Credit Facility (Details 1) (USD $) In Thousands	3 Months Ended	6 Months Ended
Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Debt Instrument [Line Items]
Amortization of debt discount			$ 7,732	$ 6,266
2.625% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Contractual coupon interest	3,938	3,938	7,875	4,988
Amortization of debt issuance costs	362	365	724	482
Amortization of debt discount	2,763	3,167	5,526	4,213
Total interest expense related to the debentures	7,063	7,470	14,125	9,683
3.125% Debentures [Member]
Debt Instrument [Line Items]
Contractual coupon interest	5,388	5,388	10,766	10,776
Amortization of debt issuance costs	55	55	112	112
Amortization of embedded derivative	14	14	29	29
Amortization of debt discount	1,113	1,036	2,206	2,053
Total interest expense related to the debentures	$ 6,570	$ 6,493	$ 13,113	$ 12,970

The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate caption: Noncash Interest Expense.

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The component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement to which such costs relate. Alternate captions include Noncash Interest Expense.

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Interest expense related to convertible debt instruments which has been recognized for the period, including the contractual interest coupon and amortization of the debt discount, if any.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings.

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