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Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Jul. 07, 2019	Jul. 08, 2018	Jul. 07, 2019	Jul. 08, 2018	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate, amount		$ 2,948	$ 18,715	$ 22,040	$ 46,752
Income tax expense at statutory rate (percent)		25.80%	28.60%	25.80%	28.90%	24.50%
One-time, non-cash impact of the Tax Act		$ 0	$ 878	$ 0	$ 32,082
One-time, non-cash impact of the Tax Act (percent)		0.00%	1.30%	0.00%	19.80%
Termination of interest rate swaps		$ (2,984)	$ 0	$ (2,984)	$ 0
Termination of interest rate swaps (percent)		(26.10%)	0.00%	(3.50%)	0.00%
Release of valuation reserve on state tax losses and credits		$ (873)	$ (1,312)	$ (1,023)	$ (1,312)
Release of valuation reserve on state tax losses and credits (percent)		(7.60%)	(2.00%)	(1.20%)	(0.80%)
Release of federal tax liability		$ (817)	$ 0	$ (817)	$ 0
Release of federal tax liability (percent)		(7.20%)	0.00%	(1.00%)	0.00%
Stock compensation excess tax benefit		$ (18)	$ (1,268)	$ (66)	$ (2,084)
Stock compensation excess tax benefit (percent)		(0.20%)	(1.90%)	(0.10%)	(1.30%)
Adjustment to state tax provision		$ 0	$ 0	$ (1,027)	$ 0
Adjustment to state tax provision (percent)		0.00%	0.00%	(1.20%)	0.00%
Other, amount		$ (304)	$ 321	$ (424)	$ 460
Other (percent)		(2.60%)	0.50%	(0.40%)	0.30%
Effective income tax rate, amount	[1]	$ (2,048)	$ 17,334	$ 15,699	$ 75,898
Effective income tax rates, percent	[1]	(17.90%)	26.50%	18.40%	46.90%
[1] Percentages may not add due to rounding.

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