Financial Instruments, Long-term Debt (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Jun. 24, 2017	Jun. 29, 2019	Mar. 30, 2013
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 1,000,000			$ 1,000,000
Less: Reduction for unamortized discount and debt issuance costs	(7,056)	$ (7,416)
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed			101.00%
Interest expense relating to the Notes	8,900	12,400
Estimated fair value of long-term debt	1,030,000
Interest Expense	9,300	$ 12,600
Secured Long-term Debt, Noncurrent	992,944			992,584
Fixed Rate Note Due June 2027 at 3 Point 45 Percent [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500,000		$ 500,000	500,000
Fixed Rate Note Due November 2018 at 2 Point 50 Percent [Member]
Debt Instrument [Line Items]
Long-term debt				$ 500,000
Stated interest rate of the notes	0.00%			2.50%
Fxed Rate Note Due March 2023 at 3 Point 375 Percent [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500,000			$ 500,000	$ 500,000
Effective interest rate of the Notes					3.50%
proceeds from issuance of long term debt 3					$ 490,000
FixedRateNoteDueJune2027at3Point450Percent[Member] [Member]
Debt Instrument [Line Items]
Stated interest rate of the notes	3.45%		3.45%	3.45%
Fixed Rate Note Due June 2027 at 3 Point 50 Percent [Member] [Domain]
Debt Instrument [Line Items]
Effective interest rate of the Notes			3.50%
Fixed Rate Note Due June 2027 at 3 Point 50 Percent [Member] [Member]
Debt Instrument [Line Items]
Net Proceeds From Issuance of Long Term Debt 5			$ 495,200
Fixed Rate Note Due March 2023 at 3 Point 375 Percent [Member]
Debt Instrument [Line Items]
Stated interest rate of the notes	3.375%			3.375%	3.375%