Related Party Transactions (Details) (USD $)	9 Months Ended			1 Months Ended			9 Months Ended						9 Months Ended	1 Months Ended	9 Months Ended
	Oct. 29, 2011	Oct. 27, 2012 Stock Options	Jan. 28, 2012 Stock Options	Jun. 30, 2012 Henry Stupp Stock Options 2006 Plan	Jul. 30, 2011 Henry Stupp Employment Agreement	Aug. 31, 2010 Henry Stupp Employment Agreement	Oct. 27, 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	Oct. 27, 2012 Henry Stupp Employment Agreement Maximum	Aug. 31, 2010 Henry Stupp Stock Option Agreement Stock Options	Oct. 27, 2012 Henry Stupp Stock Option Agreement Stock Options	Aug. 26, 2010 Henry Stupp Stock Option Agreement Stock Options item	Jul. 26, 2012 Mr. Stupp's former spouse Stock Option Agreement
Related party transactions
Number of shares of common stock purchased					12,562	81,967
Share price of common stock purchased (in dollars per share)											$ 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		186,333													112,500
Granted (in shares)		293,000		90,000										300,000
Number of shares subject to option		1,075,000	973,833												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