Other Long-Term Obligations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014	Aug. 03, 2013
Other Liabilities Disclosure [Abstract]
Interest expense related to build-to-suit lease transactions	$ 1.4	$ 0.2	$ 2.2	$ 0.2
Interest expense related to notes payable for share repurchases	$ 0.2	$ 0	$ 0.4	$ 0