Impact of Impairment of Certain Long-Lived Assets on Financial Condition and Results of Operations (Detail) (USD $) In Thousands, unless otherwise specified	5 Months Ended	6 Months Ended
	Jul. 30, 2011	Jul. 28, 2012
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charge	$ 395	$ 160
Long-term assets written down to fair value
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charge	$ 395	$ 160