Share-Based Payments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	8 Months Ended
May 09, 2020	May 04, 2019	May 09, 2020	May 04, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted			188,324	172,750
Weighted average grant date fair value of options granted			$ 252.39	$ 208.37
Stock options exercised - Shares			121,236	408,657
Stock options exercised - Weighted average exercise price			$ 480.39	$ 412.75
Share-based compensation expense	$ 10.1	$ 10.0	$ 32.3	$ 31.5
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non vested restricted stock unit award	$ 10.1		$ 10.1
Estimated weighted average period			2 years 10 months 24 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anti-dilutive shares excluded from the computation of earnings per share	187,965	4,177	161,321	149,648

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Net number of share options (or share units) granted during the period.

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Number of share options (or share units) exercised during the current period.

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