Equity Incentive Plans - Additional Information (Details)					1 Months Ended		12 Months Ended
	Aug. 01, 2022 shares	Aug. 02, 2021 shares	Aug. 01, 2020 shares	Dec. 13, 2019 USD ($) PurchasePeriod shares	Oct. 31, 2021 $ / shares shares	Dec. 31, 2020 $ / shares shares	Jul. 31, 2022 USD ($) Plan $ / shares shares	Jul. 31, 2021 USD ($) $ / shares shares	Jul. 31, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans | Plan							3
Shares reserved for future issuance (in shares)							41,346,000
Number of shares available for grant (in shares)							15,200,000
Options granted (in shares)							0	0	0
Exercises in period, intrinsic value | $							$ 35,000,000.0	$ 90,500,000	$ 23,400,000
Proceeds from stock options exercised | $							6,500,000	15,100,000	6,900,000
Options vested in period, fair value | $								200,000	1,000,000.0
Monetary cap | $				$ 25,000
Share cap (in shares)				1,000
Offering period duration (in months)				12 months
Number of six-month purchase periods | PurchasePeriod				2
Proceeds from Stock Plans | $							67,826,000	$ 65,766,000	57,797,000
Compensation not yet recognized | $							$ 583,400,000
Period for recognition (in years)							2 years 6 months
Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments outstanding (in shares)							1,100,000
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)							2,362,000
Percent of eligible compensation (up to)				15.00%
Purchase price of common stock, percent				85.00%
ESPP stock issued during period (in shares)							2,800,000
Employee stock purchase plan | 2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from Stock Plans | $							$ 62,600,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)							4 years
Expiration period (in years)							10 years
Incentive Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, percent of estimated fair value							100.00%
Non-qualified Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, percent of estimated fair value							100.00%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)							15,575,000	13,732,000
Granted (in dollars per share) | $ / shares							$ 30.92	$ 29.60
Released (in dollars per share) | $ / shares							$ 32.68	$ 32.58
RSUs | Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					400,000	703,117
Granted (in dollars per share) | $ / shares					$ 46.20	$ 35.69
Vesting percentage					200.00%	133.00%
Award vesting period (in years)					2 years 9 months 18 days	4 years
Options vested in period, fair value | $							$ 314,600,000	$ 317,400,000	$ 298,200,000
RSUs | Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)						75,000
Granted (in dollars per share) | $ / shares						$ 27.54
Award vesting period (in years)						3 years 10 months 24 days
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)							39,000,000.0
Common Class A | 2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)							22,400,000
Annual increase (in shares)							18,000,000.0
Annual increase, percent of outstanding shares							5.00%
Number of additional shares authorized (in shares)	11,300,000	10,700,000	10,100,000
Number of shares available for grant (in shares)							15,159,000
Common Class A | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)				11,500,000
Number of additional shares authorized (in shares)				9,200,000
Principal Owner | Incentive Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)							5 years
Exercise price, percent of estimated fair value							110.00%