Income Taxes - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended				6 Months Ended		3 Months Ended
	May 31, 2012	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012 C Corporation	May 01, 2012 S Corporation	Jul. 28, 2012 Pro Forma	Jul. 30, 2011 Pro Forma	Jul. 28, 2012 Pro Forma	Jul. 30, 2011 Pro Forma	Jul. 28, 2012 Actual C Corporation	May 01, 2012 Actual S Corporation	May 01, 2012 Scenario, Previously Reported S Corporation
Income Taxes [Line Items]
Increase in current deferred tax assets	$ 3,600,000
Increase in noncurrent deferred tax liabilities	600,000
Deferred Income tax benefit Recognized	3,000,000			6,148,000		3,000,000
Effective income tax rate		33.60%			1.10%					40.00%		33.60%	33.60%	1.10%
Assumed combined federal, state and local effective tax rate								40.00%			40.00%
Income tax benefit		$ (2,122,000)	$ 40,000	$ (2,053,000)	$ 96,000	$ 1,100,000	$ (2,000,000)	$ (1,311,000)	$ 1,404,000	$ 1,082,000	$ 3,370,000