Debt and Credit Facility (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 26, 2015	Sep. 26, 2015	Mar. 29, 2014	Mar. 28, 2015
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	$ 995,333	$ 995,333		$ 994,839	[1]
2019 and 2021 Notes Payable [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt			$ 990,100
3.0% 2021 Senior Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500,000	500,000		500,000
Debt Instrument, Unamortized Discount	$ (2,849)	$ (2,849)		(3,088)
Debt instrument, Maturity Date		Mar. 15, 2021
Discount Percent of Par	99.281%	99.281%
2.125% 2019 Senior Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000	$ 500,000		500,000
Debt Instrument, Unamortized Discount	$ (1,818)	$ (1,818)		(2,073)
Debt instrument, Maturity Date		Mar. 15, 2019
Discount Percent of Par	99.477%	99.477%
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Price Per Share To Be Purchase By Company Under Call Option	$ 29.2608
Debt Instrument, Face Amount	$ 600,000	$ 600,000		600,000
Debt Instrument, Unamortized Discount	(25,907)	(25,907)		(33,679)
Debt Instrument Carrying Amount Of Liability Component	581,580	581,580		576,053
Equity component - net carrying value	$ 66,415	$ 66,415		$ 66,415

[1] Derived from audited financial statements