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Convertible Debentures and Revolving Credit Facility (Details 1) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Mar. 31, 2012
Dec. 29, 2012
2.625% Senior Convertible Debentures [Member]
Dec. 31, 2011
2.625% Senior Convertible Debentures [Member]
Dec. 29, 2012
2.625% Senior Convertible Debentures [Member]
Dec. 31, 2011
2.625% Senior Convertible Debentures [Member]
Mar. 31, 2012
2.625% Senior Convertible Debentures [Member]
Dec. 29, 2012
3.125% Junior Convertible Debentures [Member]
Oct. 01, 2011
3.125% Junior Convertible Debentures [Member]
Dec. 29, 2012
3.125% Junior Convertible Debentures [Member]
Dec. 31, 2011
3.125% Junior Convertible Debentures [Member]
Mar. 31, 2012
3.125% Junior Convertible Debentures [Member]
Debt Instrument [Line Items]                          
Principal amount of Debentures       $ 600,000   $ 600,000   $ 600,000 $ 689,635   $ 689,635   $ 689,635
Contractual coupon interest       3,938 3,938 11,813 11,813   5,388 5,388 16,163 16,163  
Amortization of debt issuance costs       362 362 1,086 1,086   55 55 168 168  
Amortization of embedded derivative                 14 14 43 43  
Amortization of debt discount 11,877 11,629   2,763 2,763 8,289 8,289   1,218 1,133 3,588 3,339  
Fair value adjustment of embedded derivative                 (221) (655) 393 407  
Total interest expense related to the debentures       7,063 7,063 21,188 21,188   6,454 5,935 20,355 20,120  
Debt Instrument, Unamortized Discount       (68,653)   (68,653)   (80,311) (321,860)   (321,860)   (325,448)
Debt Instrument Unamortized Discount Of Embedded Derivative From Date Of Issuance                 (1,402)   (1,402)   (1,446)
Debt Instrument Carrying Amount Of Liability Component                 366,373   366,373   362,741
Embedded Derivative, Fair Value of Embedded Derivative Liability 1,324   931           1,324   1,324   931
Convertible Debt, Noncurrent 918,883   906,569 [1] 551,186   551,186   542,897 367,697   367,697   363,672
Debt Instrument, Convertible, Carrying Amount of Equity Component       $ 105,620   $ 105,620   $ 105,620 $ 229,513   $ 229,513   $ 229,513
[1] Derived from audited financial statements