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Income Taxes - Reconciliation of Effective Tax Rate to the Statutory Federal Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 03, 2019 | Jul. 28, 2018 | Jul. 29, 2017
Income Tax Disclosure [Abstract] |  |  |
Tax at federal statutory rate, amount | $ 6,473 | $ 14,752 | $ 4,481
Tax at federal statutory rate, percent | 21.00% | 27.00% | 35.00%
State taxes, net of federal effect, amount | $ (1,068) | $ (755) | $ 1,270
State taxes, net of federal effect, percent | (3.50%) | (1.40%) | 9.90%
Remeasurement of preferred stock warrant liability, amount | $ 0 | $ (2,881) | $ 6,608
Remeasurement of preferred stock warrant liability, percent | 0.00% | (5.30%) | 51.60%
Stock-based compensation, amount | $ (7,114) | $ (5,454) | $ 229
Stock-based compensation, percent | (23.10%) | (9.90%) | 1.80%
Tax Act impact, amount | $ 0 | $ 6,670 | $ 0
Tax Act impact, percent | 0.00% | 12.20% | 0.00%
Research and development credits, amount | $ (5,984) | $ (2,146) | $ 0
Research and development credits, percent | (19.40%) | (3.90%) | (0.00%)
Uncertain tax positions, amount | $ 2,030 | $ 2,846 | $ 23
Uncertain tax positions, percent | 6.60% | 5.10% | 0.20%
Return to provision, amount | $ (1,821) | $ (3,891) | $ 0
Return to provision, percent | (5.90%) | (7.10%) | 0.00%
Nondeductible compensation, amount | $ 765 | $ 652 | $ 1,188
Nondeductible compensation, percent | 2.50% | 1.20% | 9.30%
Other, amount | $ 659 | $ 20 | $ (404)
Other, percent | 2.10% | 0.00% | (3.20%)
Provision (benefit) for income taxes | $ (6,060) | $ 9,813 | $ 13,395
Effective tax rate, percent | (19.70%) | 17.90% | 104.60%

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