Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 72,214	$ 47,454	$ 23,212
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	7,398	5,159	2,863
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	(2,013)	(1,220)	491
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	113	(74)	53
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(125)	(59)	$ (278)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount	4,500	4,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount	$ 2,500	$ 2,800