Debt and Credit Facility (Details) (USD $)	12 Months Ended		9 Months Ended	3 Months Ended
	Mar. 29, 2014		Dec. 27, 2014	Dec. 27, 2014
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	$ 993,870,000	[1]	$ 994,595,000	$ 994,595,000
2019 and 2021 Notes Payable [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt	990,100,000
2021 Notes Payable [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500,000,000		500,000,000	500,000,000
Debt Instrument, Unamortized Discount	(3,556,000)		(3,206,000)	(3,206,000)
Debt instrument, Maturity Date			Mar. 15, 2021
Discount Percent of Par			99.281%	99.281%
2019 Notes Payable [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500,000,000		500,000,000	500,000,000
Debt Instrument, Unamortized Discount	(2,574,000)		(2,199,000)	(2,199,000)
Debt instrument, Maturity Date			Mar. 15, 2019
Discount Percent of Par			99.477%	99.477%
2017 Convertible Notes [Member]
Debt Instrument [Line Items]
Price Per Share To Be Purchase By Company Under Call Option				$ 29.64
Debt Instrument, Face Amount	600,000,000		600,000,000	600,000,000
Debt Instrument, Unamortized Discount	(49,223,000)		(37,565,000)	(37,565,000)
Debt Instrument Carrying Amount Of Liability Component	565,001,000		573,290,000	573,290,000
Equity component - net carrying value	$ 66,415,000		$ 66,415,000	$ 66,415,000

[1] Derived from audited financial statements