Stock-Based Compensation (Tables)
 9 Months Ended
Apr. 29, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
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 – July 30, 2022
4,703,564 $21.07 7.58$638 
Granted3,836,774 4.57 
Exercised(119,170)1.30 
Cancelled(1,951,644)27.09 
Balance – April 29, 2023
6,469,524 $9.83 8.56$29 
Schedule of Unvested Restricted Stock Units Activity
The following table summarizes the RSU award activity under the 2017 Plan and 2019 Plan:
Unvested RSUs
 Class A Common StockWeighted-
Average
Grant Date
Fair Value
Unvested at July 30, 2022
19,217,622 $16.09 
Granted6,745,333 4.38 
Vested(4,354,801)13.92 
Forfeited(8,152,659)15.90 
Unvested at April 29, 2023
13,455,495 $11.04 
Schedule of Black - Scholes Option - Pricing Model Assumptions Used in Estimating 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 Nine Months Ended
 April 29, 2023April 30, 2022April 29, 2023April 30, 2022
Expected term (in years)
3.8 - 5.3
3.1 - 3.7
3.2 - 5.5
3.1 - 5.5
Volatility
83.2%
67.0%
83.2% - 87.3%
62.1% - 67.0%
Risk free interest rate
3.6% - 3.8%
1.4% - 1.5%
3.6% -4.4%
0.8% - 1.5%
Dividend yield— %— %— %— %