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Net Loss Per Share Attributable to Common Stockholders - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2022
May 01, 2021
Apr. 30, 2022
May 01, 2021
Numerator:        
Net loss $ (78,040) $ (18,846) $ (110,779) $ (30,344)
Net loss attributable to common stockholders - basic (78,040) (18,846) (110,779) (30,344)
Net loss attributable to common stockholders - diluted $ (78,040) $ (18,846) $ (110,779) $ (30,344)
Denominator:        
Weighted-average shares of common stock - basic (in shares) 108,759,202 106,696,220 108,771,065 105,457,907
Weighted-average shares of common stock - diluted (in shares) 108,759,202 106,696,220 108,771,065 105,457,907
Loss per share attributable to common stockholders:        
Basic (in dollars per share) $ (0.72) $ (0.18) $ (1.02) $ (0.29)
Diluted (in dollars per share) $ (0.72) $ (0.18) $ (1.02) $ (0.29)
Class A Common Stock        
Numerator:        
Net loss $ (59,783) $ (12,142) $ (83,688) $ (18,423)
Net loss attributable to common stockholders - basic (59,783) (12,142) (83,688) (18,423)
Reallocation of undistributed loss as a result of conversion of Class B to Class A shares (18,257) (6,704) (27,091) (11,921)
Net loss attributable to common stockholders - diluted $ (78,040) $ (18,846) $ (110,779) $ (30,344)
Denominator:        
Weighted-average shares of common stock - basic (in shares) 83,315,758 68,743,748 82,170,840 64,029,465
Conversion of Class B to Class A common shares outstanding (in shares) 25,443,444 37,952,472 26,600,225 41,428,442
Weighted-average shares of common stock - diluted (in shares) 108,759,202 106,696,220 108,771,065 105,457,907
Loss per share attributable to common stockholders:        
Basic (in dollars per share) $ (0.72) $ (0.18) $ (1.02) $ (0.29)
Diluted (in dollars per share) $ (0.72) $ (0.18) $ (1.02) $ (0.29)
Class B Common Stock        
Numerator:        
Net loss $ (18,257) $ (6,704) $ (27,091) $ (11,921)
Net loss attributable to common stockholders - basic (18,257) (6,704) (27,091) (11,921)
Reallocation of undistributed loss as a result of conversion of Class B to Class A shares 0 0 0 0
Net loss attributable to common stockholders - diluted $ (18,257) $ (6,704) $ (27,091) $ (11,921)
Denominator:        
Weighted-average shares of common stock - basic (in shares) 25,443,444 37,952,472 26,600,225 41,428,442
Conversion of Class B to Class A common shares outstanding (in shares) 0 0 0 0
Weighted-average shares of common stock - diluted (in shares) 25,443,444 37,952,472 26,600,225 41,428,442
Loss per share attributable to common stockholders:        
Basic (in dollars per share) $ (0.72) $ (0.18) $ (1.02) $ (0.29)
Diluted (in dollars per share) $ (0.72) $ (0.18) $ (1.02) $ (0.29)