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Quarterly Financial Information (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Feb. 02, 2020	Nov. 03, 2019	Aug. 04, 2019	May 05, 2019	Feb. 03, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018
Quarterly Financial Information [Line Items]
Employment-related expense primarily associated with an equity grant				$ 6.5	$ 2.5	$ 1.9	$ 1.9	$ 1.7
Impairment and early lease termination charges					6.8	1.1	5.3
Tax (benefit) expense Tax Cuts and Jobs Act and true-up of deferreds	$ 6.0	$ (0.1)			0.3	10.6	2.9	3.3
Acquisition-related Costs [Member]
Quarterly Financial Information [Line Items]
Expenses related to the acquisition of Outward and its ongoing operations	$ 9.1	$ 7.4	$ 7.2	$ 6.4	$ 7.2	$ 6.0	$ 5.0	6.9
Adjustments for New Accounting Principle, Early Adoption [Member]
Quarterly Financial Information [Line Items]
Adoption of new accounting rules related to stock-based compensation								$ 1.1