Debt and Credit Facility (Details 2) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 27, 2014	Dec. 28, 2013	Mar. 29, 2014
Short-term Debt [Line Items]
Amortization of Debt Discount (Premium)			$ 9,014,000	$ 12,144,000
2017 Convertible Notes [Member]
Short-term Debt [Line Items]
Maximum number of common shares to be purchased under call option	20.2		20.2
Debt Instrument, Convertible, Remaining Discount Amortization Period			2 years 5 months 19 days
Debt Instrument, Face Amount	600,000,000		600,000,000		600,000,000
Debt Instrument, Convertible, Conversion Ratio	33.7391
Debt Instrument, Unamortized Discount	37,565,000		37,565,000		49,223,000
Hedge Accounting Adjustment - Sale Of Interest Rate Swap	10,855,000		10,855,000		14,224,000
Debt Instrument Carrying Amount Of Liability Component	573,290,000		573,290,000		565,001,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	66,415,000		66,415,000		66,415,000
Interest Expense, Debt, Excluding Amortization	3,938,000	3,938,000	11,813,000	11,813,000
Amortization of Financing Costs	362,000	362,000	1,086,000	1,086,000
Amortization of Debt Discount (Premium)	2,763,000	2,763,000	8,289,000	8,289,000
Interest Expense, Debt	7,063,000	7,063,000	21,188,000	21,188,000
Base conversion, block amount of senior convertible debenture	1,000
Warrants, number of shares the holders have the right to purchase	20.2		20.2
Class of Warrant or Right, Exercise Price of Warrants or Rights	41.9889		41.9889
Convertible debt, conversion price	$ 29.64		$ 29.64
Debt Instrument, Convertible, If-converted Value in Excess of Principal	$ 903,300,000		$ 903,300,000