Debt and Credit Facility (Details 1) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Mar. 29, 2014	Mar. 28, 2015
Debt Instrument [Line Items]
Amortization of Debt Discount (Premium)			$ 6,019,000	$ 6,008,000
Line of Credit Facility, Expiration Date			Dec. 31, 2016
Line of Credit Facility, Maximum Borrowing Capacity	$ 250,000,000		$ 250,000,000
Line of Credit Facility, Average Outstanding Amount			0
2019 and 2021 Notes Payable [Member]
Debt Instrument [Line Items]
Interest Expense, Debt, Excluding Amortization	6,406,000	$ 6,406,000	12,813,000	12,813,000
Amortization of Financing Costs	146,000	134,000	293,000	290,000
Amortization of Debt Discount (Premium)	247,000	242,000	493,000	482,000
Interest Expense, Debt	6,799,000	$ 6,782,000	13,599,000	$ 13,585,000
Proceeds from Issuance of Long-term Debt					$ 990,100,000
2.125% 2019 Senior Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500,000,000		500,000,000			$ 500,000,000
Debt Instrument, Unamortized Discount	$ 1,818,000		$ 1,818,000			$ 2,073,000