Related Party Transactions (Details) (USD $)	6 Months Ended			1 Months Ended		21 Months Ended			1 Months Ended		6 Months Ended						6 Months Ended
	Jul. 30, 2011	Jul. 28, 2012 Stock Options	Jan. 28, 2012 Stock Options	Jun. 30, 2012 Henry Stupp Stock Options	Aug. 31, 2010 Henry Stupp Stock Options	Apr. 30, 2012 Henry Stupp Stock Options	Jul. 28, 2012 Henry Stupp Stock Options	Aug. 26, 2010 Henry Stupp Stock Options item	Jul. 30, 2011 Henry Stupp Employment Agreement	Aug. 31, 2010 Henry Stupp Employment Agreement	Jul. 28, 2012 Henry Stupp Employment Agreement	Apr. 30, 2012 Henry Stupp Employment Agreement	Jan. 31, 2012 Henry Stupp Employment Agreement	Oct. 31, 2011 Henry Stupp Employment Agreement	Jul. 28, 2011 Henry Stupp Employment Agreement	Aug. 26, 2010 Henry Stupp Employment Agreement	Jul. 28, 2012 Henry Stupp Employment Agreement Maximum	Jul. 26, 2012 Mr. Stupp's former spouse Employment Agreement
Related party transactions
Number of shares of common stock purchased									12,562	81,967
Share price of common stock purchased															$ 15.92	$ 18.30
Issuance of common stock	$ 200,000								$ 200,000	$ 1,500,000
Aggregate amount of subsequent shares agreed to be purchased																600,000
Incremental amount of subsequent shares agreed to be purchased on or before specified date												200,000	200,000	200,000
Number of shares subject to option forfeited		163,334				112,500					112,500
Granted (in shares)		293,000		90,000	300,000
Number of shares subject to option		1,103,499	973,833				187,500				187,500
Vesting period				3 years
Base salary after increase											600,000
Performance bonus as a percentage of per-tax income in excess of a threshold amount											5.00%
Threshold amount of the entity's pre-tax income used to calculate performance bonus											20,000,000
Performance bonus per fiscal year pursuant to the terms of the Employment Agreement																	650,000
Bonus target amount used to calculate cash bonus											$ 200,000						$ 400,000
Period after the end of fiscal year during which cash bonus amount will be determined											75 days
Percentage of the shares transferred																		50.00%
Exercise price of stock option granted (in dollars per share)		$ 11.75		$ 13.06	$ 18.30
Number of equal annual installments beginning on January 31, 2012, in which the options vest								5
Number of additional increments on each yearly anniversary thereafter in which the options vest								4
Additional vesting rate in the event of a change in control of the entity (as a percent)								20.00%
Term of option				7 years	6 years