Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended			9 Months Ended		6 Months Ended	3 Months Ended		1 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012 C Corporation	Oct. 27, 2012 C Corporation	May 01, 2012 S Corporation	Oct. 27, 2012 Pro Forma	Oct. 29, 2011 Pro Forma	Oct. 27, 2012 Pro Forma	Oct. 29, 2011 Pro Forma	Oct. 27, 2012 Actual C Corporation	May 01, 2012 Actual S Corporation	May 01, 2012 Scenario, Previously Reported S Corporation	May 31, 2012 IPO	May 31, 2012 IPO One-time charge
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			6,325,000			3,000,000										3,000,000
Effective income tax rate			32.90%	1.10%						40.00%		32.90%	32.90%	1.10%
Assumed combined federal, state and local effective tax rate								40.00%			40.00%
Income tax benefit	$ 4,532,000	$ 140,000	$ 2,478,000	$ 236,000	$ 3,500,000		$ 2,000,000	$ 5,530,000	$ 4,918,000	$ 6,612,000	$ 8,288,000