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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Apr. 07, 2022	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized for issuance (in shares)	6,000,000
Unrecognized compensation expense related to unvested options and RSUs, net of forfeitures		$ 332.3		$ 332.3
Unrecognized compensation expense related to unvested options weighted average recognition period				2 years 8 months 12 days
Weighted-average grant date fair value of options (in dollars per share)				$ 7.16	$ 27.74
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 31.6	$ 28.8	$ 96.3	$ 73.5
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable period				10 years
2011 Equity Incentive Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options vesting percentage				25.00%
Award vesting period				3 years
2017 Incentive Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)		32,793,232		32,793,232
2017 Incentive Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options vesting percentage				25.00%
Award vesting period				3 years
Options exercisable period				10 years
2019 Inducement Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)		10,750,000		10,750,000

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