Commitments and Contingencies - Minimum and Contingent Rent under Lease Agreements Accounted for Operating Leases and Lease Agreements for Build-To-Suit Lease Transactions (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Commitments And Contingencies Disclosure [Abstract]
Minimum rent payments recognized as interest expense	$ 9.9	$ 5.3	$ 1.1