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Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
		Apr. 14, 2019	Apr. 15, 2018	Apr. 14, 2019	Apr. 15, 2018	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate, amount		$ 8,633	$ 10,717	$ 19,068	$ 28,037
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		25.80%	29.40%	25.80%	29.10%	24.50%
Stock compensation excess tax benefit		$ 3	$ (14)	$ (47)	$ (816)
Stock compensation excess tax benefit		0.00%	0.00%	(0.10%)	(0.90%)
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit)		$ 0	$ 577	$ 0	$ 31,204
One-time, non-cash impact of the Tax Act, percent		0.00%	1.60%	0.00%	32.40%
Adjustment to state tax provision		$ 0	$ 0	$ (1,027)	$ 0
Adjustment to state tax provision		0.00%	0.00%	(1.40%)	0.00%
Other, amount		$ (262)	$ 146	$ (247)	$ 139
Other, percent		(0.80%)	0.40%	(0.30%)	0.10%
Effective income tax rate, amount	[1]	$ 8,374	$ 11,426	$ 17,747	$ 58,564
Effective income tax rates, percent	[1]	25.00%	31.40%	24.00%	60.70%
[1] Percentages may not add due to rounding.

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