Debt and Credit Facility (Details) (USD $)	12 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 30, 2013
Long Term Debt [Line Items]
Long-term Debt, Excluding Current Maturities	$ 994,839,000	$ 993,870,000
Amortization of Debt Discount (Premium)	12,022,000	16,319,000	15,880,000
Proceeds from Issuance of Long-term Debt	0	990,149,000	0
Line of Credit Facility, Expiration Date	Dec. 31, 2016
Line of Credit Facility, Maximum Borrowing Capacity	250,000,000
Line of Credit Facility, Average Outstanding Amount	0
2019 Debt instrument, Maturity Date	Mar. 15, 2019
2021 Debt instrument, Maturity Date	Mar. 15, 2021
2037 Convertible Notes
Long Term Debt [Line Items]
Interest Expense, Debt, Excluding Amortization			21,551,000
Amortization of Financing Costs			223,000
Amortization of embedded derivative			58,000
Amortization of Debt Discount (Premium)			4,828,000
Fair value adjustment of embedded derivative			(159,000)
Interest Expense, Debt			26,819,000
2017 Convertible Notes
Long Term Debt [Line Items]
Interest Expense, Debt, Excluding Amortization			15,750,000
Amortization of Financing Costs			1,448,000
Amortization of Debt Discount (Premium)			11,052,000
Interest Expense, Debt			28,250,000
2019 and 2021 Notes Payable [Member]
Long Term Debt [Line Items]
Interest Expense, Debt, Excluding Amortization	25,625,000	1,210,000	0
Amortization of Financing Costs	586,000	52,000	0
Amortization of Debt Discount (Premium)	970,000	80,000	0
Interest Expense, Debt	27,181,000	1,342,000	0
2019 Notes Payable [Member]
Long Term Debt [Line Items]
Discount Percent Of Par	99.477%
Debt Instrument, Face Amount	500,000,000	500,000,000
Debt Instrument, Unamortized Discount	2,073,000	2,574,000
2021 Notes Payable [Member]
Long Term Debt [Line Items]
Discount Percent Of Par	99.281%
Debt Instrument, Face Amount	500,000,000	500,000,000
Debt Instrument, Unamortized Discount	$ 3,088,000	$ 3,556,000