Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Future Issuance (Details) - shares shares in Thousands	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Class of Stock [Line Items]
Share reserved for future equity grants (in shares)	15,200
Shares underlying outstanding stock options (in shares)	1,689	3,334	7,546
Shares reserved for future issuance (in shares)	41,346
RSUs
Class of Stock [Line Items]
Shares underlying outstanding restricted stock units (in shares)	22,136	21,708	22,632
Employee Stock Purchase Plan
Class of Stock [Line Items]
Shares reserved for future issuance (in shares)	2,362
Common Class A | 2016 Plan
Class of Stock [Line Items]
Share reserved for future equity grants (in shares)	15,159
Shares reserved for future issuance (in shares)	22,400