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Income Taxes (Details) - USD ($) $ in Thousands		4 Months Ended		12 Months Ended
		Jan. 20, 2019	Jan. 21, 2018	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate, amount		$ 10,434	$ 17,192
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		25.80%	28.60%	24.50%
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit)		$ 0	$ 30,627
One-time, non-cash impact of the Tax Act, percent		0.00%	51.00%
Stock compensation excess tax benefit		$ (50)	$ (802)
Stock compensation excess tax benefit		(0.10%)	(1.30%)
Adjustment to state tax provision		$ (1,027)	$ 0
Adjustment to state tax provision		(2.60%)	0.00%
Other, amount		$ 16	$ 121
Other, percent		0.00%	0.20%
Effective income tax rate, amount	[1]	$ 9,373	$ 47,138
Effective income tax rates, percent	[1]	23.10%	78.50%
[1] Percentages may not add due to rounding.

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