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Income Taxes - Uncertain Tax Positions (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 03, 2019
Jul. 28, 2018
Jul. 29, 2017
Reconciliation of Unrecognized Tax Benefits      
Balance at the beginning of the year $ 5,503 $ 1,052 $ 846
Lapse of statute of limitations (422) 0 0
Increase related to prior period tax positions 2,602 2,334 0
Decrease related to prior period tax positions (183) (241) (36)
Increase related to current year tax positions 3,495 2,358 242
Balance at the end of the year $ 10,995 $ 5,503 $ 1,052