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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
	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

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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+ References

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