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Stock-Based Compensation - Summary of Stock Option Activity Under 2011 and 2017 Stock Plan (Details) - 2011, 2017, and 2019 Plans
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
May 02, 2020
USD ($)
$ / shares
shares
Aug. 03, 2019
USD ($)
$ / shares
shares
Number of Options    
Outstanding, beginning balance (in shares) | shares 7,070,125  
Granted (in shares) | shares 1,602,670  
Exercised (in shares) | shares (764,284)  
Cancelled (in shares) | shares (500,803)  
Outstanding, ending balance (in shares) | shares 7,407,708 7,070,125
Weighted- Average Exercise Price    
Outstanding, beginning balance (in dollars per share) | $ / shares $ 14.48  
Granted (in dollars per share) | $ / shares 23.39  
Exercised (in dollars per share) | $ / shares 8.09  
Cancelled (in dollars per share) | $ / shares 22.33  
Outstanding, ending balance (in dollars per share) | $ / shares $ 16.79 $ 14.48
Weighted- Average Remaining Contractual Life (in Years)    
Outstanding, weighted-average remaining contractual life 7 years 7 months 2 days 7 years 8 months 19 days
Aggregate Intrinsic Value (in thousands)    
Outstanding, aggregate intrinsic value | $ $ 21,095 $ 73,861