Debt and Credit Facility (Details 1) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014	Mar. 30, 2013	Mar. 12, 2014
Short-term Debt [Line Items]
Amortization of Debt Discount (Premium)		$ 12,022,000	$ 16,319,000	$ 15,880,000
Gains (Losses) on Extinguishment of Debt	(9,848,000)	0	(9,848,000)	0
2037 Convertible Notes
Short-term Debt [Line Items]
Debt Instrument Unamortized Discount Of Embedded Derivative From Date Of Issuance					1,300,000
Extinguishment of Debt, Amount			1,230,000,000
Debt Instrument, Face Amount					689,600,000
Amortization of Financing Costs		0	223,000
Debt Instrument, Unamortized Discount					315,400,000
Unamortized Debt Issuance Expense					5,100,000
Amortization of embedded derivative		0	58,000
Amortization of Debt Discount (Premium)		0	5,187,000
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net		0	1,090,000
Debt Instrument Carrying Amount Of Liability Component					377,600,000
Debt Instrument, Convertible, Carrying Amount of Equity Component					856,500,000
Gains (Losses) on Extinguishment of Debt			(9,800,000)
Interest Expense, Debt, Excluding Amortization		0	20,065,000
Interest Expense, Debt		0	24,443,000
2017 Convertible Notes
Short-term Debt [Line Items]
Base conversion, block amount of senior convertible debenture		1,000
Debt Instrument, Convertible, Conversion Ratio		33.7391
Convertible debt, conversion price		$ 29.64
Debt Instrument, Convertible, Remaining Discount Amortization Period		2 years 2 months 19 days
Debt instrument, Convertible, If-converted Value		831,600,000
Price Per Share To Be Purchase By Company Under Call Option			$ 29.64
Warrants, number of shares the holders have the right to purchase		20.2
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 41.99
Maximum number of common shares to be purchased under call option		20.2
Debt Instrument, Face Amount	600,000,000	600,000,000	600,000,000
Amortization of Financing Costs		1,448,000	1,448,000
Debt Instrument, Unamortized Discount	49,223,000	33,679,000	49,223,000
Amortization of Debt Discount (Premium)		11,052,000	11,052,000
Debt Instrument Carrying Amount Of Liability Component	565,001,000	576,053,000	565,001,000
Hedge Accounting Adjustment - Sale Of Interest Rate Swap	14,224,000	9,732,000	14,224,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	66,415,000	66,415,000	66,415,000
Interest Expense, Debt, Excluding Amortization		15,750,000	15,750,000
Interest Expense, Debt		$ 28,250,000	$ 28,250,000