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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
Apr. 30, 2022
$ / shares
shares
Class A Common Stock  
Unvested, beginning balance (in shares) | shares 10,264,925
Granted (in shares) | shares 13,186,611
Vested (in shares) | shares (2,344,882)
Forfeited (in shares) | shares (4,227,978)
Unvested, ending balance (in shares) | shares 16,878,676
Weighted- Average Grant Date Fair Value  
Unvested, beginning balance (in dollars per share) | $ / shares $ 31.35
Granted (in dollars per share) | $ / shares 16.34
Vested (in dollars per share) | $ / shares 27.57
Forfeited (in dollars per share) | $ / shares 29.03
Unvested, ending balance (in dollars per share) | $ / shares $ 20.73