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Stock-Based Compensation (Tables)
 6 Months Ended
Jan. 30, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity Under 2011 and 2017 Stock Plan
Stock option activity under the 2011 Plan, 2017 Plan, and 2019 Plan is as follows:
 Options Outstanding
Number of
Options		Weighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Life (in Years)		Aggregate
Intrinsic
Value
(in thousands)
Balance – August 1, 2020
6,817,196 $17.10 7.41$40,252 
Granted392,000 $56.50 
Exercised(1,601,726)$12.82 
Cancelled(1,054,611)$22.19 
Balance – January 30, 2021
4,552,859 $20.82 7.33$339,750 
Schedule of Unvested Restricted Stock Units Activity
The following table summarizes the restricted stock unit (“RSU”) award activity under the 2017 Plan and 2019 Plan:
Unvested RSUs
 Class A Common StockWeighted-
Average
Grant Date
Fair Value
Unvested at August 1, 2020
9,123,341 $20.11 
Granted4,727,643 $31.87 
Vested(950,507)$22.05 
Forfeited(1,468,261)$21.62 
Unvested at January 30, 2021
11,432,216 $24.62 
Summary of Assumptions Used in Black-Scholes Option-Pricing Model to Determine Fair Value of Stock Options The fair value of stock options granted to employees was estimated at the grant date using the Black-Scholes option-pricing model with the following assumptions:
 For the Three Months EndedFor the Six Months Ended
 January 30, 2021February 1, 2020January 30, 2021February 1, 2020
Expected term (in years)
5.3 - 6.3
5.5 - 6.1
5.3 - 6.3
5.5 - 6.2
Volatility55.5 %
50.1%
55.5% - 55.9%
50.1% - 51.2%
Risk free interest rate
0.4% - 0.5%
1.6%
0.3% - 0.5%
1.6% - 1.7%
Dividend yield— %— %— %— %