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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jan. 30, 2021	Feb. 01, 2020	Jan. 30, 2021	Feb. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of options (in dollars per share)			$ 28.46	$ 11.59
Unrecognized compensation expense related to unvested options and RSUs, net of forfeitures	$ 275.3		$ 275.3
Unrecognized compensation expense related to unvested options weighted average recognition period			2 years 7 months 6 days
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 24.8	$ 15.8	$ 44.7	$ 27.9
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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)	27,395,455		27,395,455
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
2017 Incentive Plan | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options vesting percentage			25.00%
Award vesting period			3 years
2019 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)	4,750,000		4,750,000

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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