Financial Instruments, Long-term Debt (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 26, 2015 USD ($)	Sep. 27, 2014 USD ($)	Jun. 27, 2015 USD ($)	Jun. 27, 2014 USD ($)	Mar. 30, 2013 USD ($)
Debt Instrument [Line Items]
Long-term debt	$ 1,001,024		$ 1,001,024
Long-term debt, current portion	(1,024)		(1,024)
Long-term debt, excluding current portion	1,000,000		1,000,000
Interest expense relating to the Notes	7,300	$ 7,400
Estimated fair value of long-term debt	1,001,000
Fixed Rate Note Due November 2018 at 2 Point 50 Percent [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500,000	$ 500,000	500,000
Stated interest rate of the notes	2.50%	2.50%
Effective interest rate of the Notes		2.60%
Net Proceeds From Issuance of Long Term Debt 4	$ 494,500
Fixed Rate Note Due March 2023 at 3 Point 375 Percent [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500,000		500,000		$ 500,000
Stated interest rate of the notes	3.375%				3.375%
Effective interest rate of the Notes					3.50%
Net Proceeds From Issuance of Long Term Debt 4	$ 490,000
Term fixed rate notes (2.0%) due up to September 30, 2015 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,024		$ 1,024
Minimum stated interest rate of notes	2.00%
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Convenant Requirement, minimum interest coverage ratio			3.5
Line of Credit Facility, Maximum Borrowing Capacity				$ 350,000
Debt Instrument, Covenant Requirement, Ratio of Debt to EBITDA			3