Stock Issued During Period, Shares, Share-based Compensation, Nonvested Options Exercised

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

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Aug. 03, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of options granted (in dollars per share)	$ 29.07	$ 11.35	$ 11.60
Grant date fair value of options vested	$ 13.3	$ 15.3	$ 13.1
Aggregate intrinsic value	78.3	19.1	49.1
Income tax benefit related to stock-based compensation	25.6	$ 17.2	$ 8.9
Unrecognized compensation expense related to unvested options and RSUs, net of forfeitures	$ 298.5
Unrecognized compensation expense, period for recognition	2 years 4 months 24 days
Shares issued for exercised unvested stock options (in shares)	0	0	0
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of award	10 years
Award vesting period	3 years
Dividend yield	0.00%	0.00%	0.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation	$ 100.7	$ 67.5	$ 35.2
25% vested on first anniversary \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
25% vested on first anniversary \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
25% vested on second anniversary \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
25% vested on second anniversary \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
25% vested on third anniversary \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
25% vested on third anniversary \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
25% vested on fourth anniversary \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
25% vested on fourth anniversary \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
2011 Plan \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Award vesting period	3 years
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	27,395,455
2017 Plan \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Term of award	10 years
Award vesting period	3 years
Number of shares authorized (in shares)	5,187,757
2017 Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
2019 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	4,750,000