Stock Repurchase (Details) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 07, 2012	Jul. 29, 2012	Jul. 29, 2012	Feb. 01, 2009	Jan. 28, 2007	Apr. 25, 2012	Jan. 29, 2012	Aug. 13, 2008	Mar. 23, 2006
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized (in shares)	700,000	700,000	700,000			500,000		200,000	200,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001			$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Shares purchased (in shares)	83,463	34,407	59,941	22,197	3,337
Remaining number of shares authorized to be repurchased (in shares)	556,596	640,059	640,059
Number of shares authorized for repurchase by broker (in shares)	175,000	175,000	175,000