Income Taxes (Details) - USD ($) $ in Thousands	4 Months Ended
	Jan. 19, 2020	Jan. 20, 2019
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate, amount	$ 2,868	$ 10,434
Income tax expense at statutory rate (percent)	26.00%	25.80%
Stock compensation tax deficiency (excess tax benefit)	$ 196	$ (50)
Stock compensation tax deficiency (excess tax benefit) (percent)	1.80%	(0.10%)
Company-owned life insurance policies	$ (99)	$ 231
Company-owned life insurance policies (percent)	(0.90%)	0.60%
Adjustment to state tax provision	$ 0	$ (1,027)
Adjustment to state tax provision (percent)	0.00%	(2.60%)
Other, amount	$ 168	$ (215)
Other (percent)	1.50%	(0.50%)
Effective income tax rate, amount	$ 3,133	$ 9,373
Effective income tax rates, percent	28.40%	23.10%