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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Jan. 26, 2019	Jul. 29, 2017	Jul. 30, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount				$ 6,000	$ 4,500
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount				1,300	2,500
Statutory rate applied to pre-tax income	$ 15,334		$ 18,488	87,649	72,214
State taxes, net of federal tax benefit	1,406		4,004	9,868	7,398
Tax Reform and related effects	(32,249)		0	0	0
Federal benefit of vesting and exercise of share-based awards	(7,067)		(200)	0	0
Non-deductible and non-taxable items, net	1,585		2,433	(4,686)	(2,013)
Change in accruals for uncertain tax positions	250		464	632	113
Tax credits	(1,596)		(1,835)	0	0
Change in valuation allowance	0		291	0	0
Effect of rates other than statutory	557		1,537	6	118
Other items, net	(505)		(51)	(261)	(243)
Total provision for income taxes	$ (22,285)	$ 44,332	$ 25,131	$ 93,208	$ 77,587

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