Commitments and Contingencies - Minimum Rent Payments and Contingent Rent Expense under Lease Agreements Accounted for Operating Leases as Build-To-Suit Lease Transactions (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017
Commitments And Contingencies Disclosure [Abstract]
Minimum rent payments recognized as interest expense	$ 20.3	$ 15.4	$ 12.1
Minimum rent payments allocated to financing obligations	7.5	10.2	0.4
Minimum rent payments allocated to deferred rent amortization	0.5
Remaining minimum rent payments represent land rent expense	$ 7.2	$ 6.7	$ 3.6