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Stock-Based Compensation (Tables)
9 Months Ended
May 02, 2020
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 3, 2019
7,070,125  $14.48  7.72$73,861  
Granted1,602,670  $23.39  
Exercised(764,284) $8.09  
Cancelled(500,803) $22.33  
Balance – May 2, 2020
7,407,708  $16.79  7.59$21,095  
Summary of Restricted Stock Units Award 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 3, 2019
4,428,845  $27.30  
Granted7,032,993  $17.01  
Vested(714,908) $25.14  
Forfeited(1,069,114) $24.49  
Unvested at May 2, 2020
9,677,816  $20.30  
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 Ended For the Nine Months Ended
 May 2, 2020 April 27, 2019 May 2, 2020 April 27, 2019
Expected term (in years)
6.2 - 6.2
 
6.0 - 6.5
 
5.5 - 6.2
5.1 - 6.5
Volatility50.1 % 
52.2%
 
50.1% - 51.2%
41.7% - 52.2%
Risk free interest rate1.4 % 
2.6%
 
1.4% - 1.7%
2.6% - 3.0%
Dividend yield— %— % — %— %