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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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