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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Aug. 03, 2019 | Jul. 28, 2018 | Jul. 29, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Blended U.S. statutory rate | 21.00% | 27.00% | 35.00%
Increase of liability for uncertain tax positions that impact current and future tax expense | $ 7.7 |  |
Lapses of applicable statutes of limitations |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Expected decrease of unrecognized tax benefits | 0.9 |  |
Federal |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Research and development tax credit carryforwards | 3.5 |  |
California |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Research and development tax credit carryforwards | $ 5.2 | $ 1.5 |
State |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Operating loss carryforwards |  | $ 0.2 |

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