Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Jan. 31, 2009	$ 137	$ 67,686	$ 153,866	$ (17,053)	$ 204,636
Balance (in shares) at Jan. 31, 2009	13,664			(745)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises		(1,853)		2,851	998
Stock option exercises (in shares)				125
Stock-based compensation income tax benefit		376			376
Employee stock purchase plan purchases		(157)		307	150
Employee stock purchase plan purchases (in shares)				13
Restricted stock awards		(98)		98	0
Restricted stock awards (in shares)	(9)			4
Common stock repurchased				(394)	(394)
Common stock repurchased (in shares)				(19)
Stock-based compensation expense		897			897
Net income			15,166		15,166
Balance at Jan. 30, 2010	137	66,851	169,032	(14,191)	221,829
Balance (in shares) at Jan. 30, 2010	13,655			(622)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises		(568)		1,146	578
Stock option exercises (in shares)				50
Stock-based compensation income tax benefit		626			626
Employee stock purchase plan purchases		(30)		190	160
Employee stock purchase plan purchases (in shares)				9
Restricted stock awards		(3,031)		3,031	0
Restricted stock awards (in shares)				133
Common stock repurchased				(656)	(656)
Common stock repurchased (in shares)				(26)
Stock-based compensation expense		4,985			4,985
Net income			26,821		26,821
Balance at Jan. 29, 2011	137	68,833	195,853	(10,480)	254,343
Balance (in shares) at Jan. 29, 2011	13,655			(456)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises		(1,449)		3,913	2,464
Stock option exercises (in shares)				162
Stock-based compensation income tax benefit		1,586			1,586
Employee stock purchase plan purchases		(12)		202	190
Employee stock purchase plan purchases (in shares)				8
Restricted stock awards		(3,254)		3,254	0
Restricted stock awards (in shares)	(3)			141
Common stock repurchased				(3,219)	(3,219)
Common stock repurchased (in shares)				(116)
Stock-based compensation expense		1,938			1,938
Net income			26,382		26,382
Balance at Jan. 28, 2012	$ 137	$ 67,642	$ 222,235	$ (6,330)	$ 283,684
Balance (in shares) at Jan. 28, 2012	13,652			(261)