Income Taxes (Details) - USD ($) $ in Thousands		4 Months Ended
		Jan. 21, 2018	Jan. 22, 2017
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate, amount		$ 17,192	$ 21,740
Income tax expense at statutory rate		28.60%	38.60%
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit)		$ 30,627	$ 0
One-time, non-cash impact of the Tax Act, percent		51.00%	0.00%
Stock compensation excess tax benefit, amount		$ (802)	$ 0
Stock compensation excess tax benefit, percent		(1.30%)	0.00%
Other, amount		$ 121	$ 91
Other, percent		0.20%	0.20%
Effective income tax rate, amount		$ 47,138	$ 21,831
Effective income tax rates, percent	[1]	78.50%	38.70%

[1] (1)Percentages may not add due to rounding.