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Name:	srt_ValuationAndQualifyingAccountsDisclosureLineItems
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Valuation and Qualifying Accounts and Reserves (Parenthetical) (Detail) - USD ($) $ in Millions	Feb. 01, 2020	Feb. 02, 2019	Feb. 03, 2018
Other Current Liabilities
Valuation and Qualifying Accounts Disclosure [Line Items]
Sales return reserve	$ 11.7	$ 9.5	$ 3.8
Prepaid and Other Current Assets
Valuation and Qualifying Accounts Disclosure [Line Items]
Merchandise return asset	$ 7.0	$ 5.7