Valuation of Long - Lived Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Impaired Long-Lived Assets Held and Used [Line Items]
Valuation of long-lived assets, estimated discount rate			13.00%
Store Related Closure Costs
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets		$ 0.3	$ 0.4	$ 1.9