Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jul. 30, 2016
Payables and Accruals [Abstract]
Accrued payroll and related taxes	$ 23,293	$ 23,908
Accrued employee benefit and incentive plan costs	33,873	40,943
Accrued construction costs	26,931	41,123
Other current liabilities	15,234	16,328
Total other accrued liabilities	$ 99,331	$ 122,302