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Stock-Based Compensation - Summary of Restricted Stock Units Award Activity (Details) - Class A Common Stock - Restricted stock units
9 Months Ended
May 02, 2020
$ / shares
shares
Class A Common Stock  
Unvested, beginning balance (in shares) | shares 4,428,845
Granted (in shares) | shares 7,032,993
Vested (in shares) | shares (714,908)
Forfeited (in shares) | shares (1,069,114)
Unvested, ending balance (in shares) | shares 9,677,816
Weighted- Average Grant Date Fair Value  
Unvested, beginning balance (in dollars per share) | $ / shares $ 27.30
Granted (in dollars per share) | $ / shares 17.01
Vested (in dollars per share) | $ / shares 25.14
Forfeited (in dollars per share) | $ / shares 24.49
Unvested, ending balance (in dollars per share) | $ / shares $ 20.30