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Earnings (Loss) Per Share Attributable to Common Stockholders - Common Stock Equivalents Excluded From Computation of Diluted Earnings (Loss) Per Share (Details) - shares | 12 Months Ended
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Aug. 03, 2019 | Jul. 28, 2018 | Jul. 29, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Common stock equivalents excluded from the computation of diluted earnings (loss) per share (in shares) | 5,431,304 | 7,237,515 | 66,252,727
Convertible preferred stock |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Common stock equivalents excluded from the computation of diluted earnings (loss) per share (in shares) | 0 | 0 | 59,511,055
Preferred stock warrants |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Common stock equivalents excluded from the computation of diluted earnings (loss) per share (in shares) | 0 | 0 | 1,066,225
Restricted stock units |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Common stock equivalents excluded from the computation of diluted earnings (loss) per share (in shares) | 2,914,630 | 2,276,994 | 0
Class A common stock | Options |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Common stock equivalents excluded from the computation of diluted earnings (loss) per share (in shares) | 1,547,495 | 1,271,152 | 0
Class B common stock | Options |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Common stock equivalents excluded from the computation of diluted earnings (loss) per share (in shares) | 969,179 | 3,689,369 | 5,675,447

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