Net Income Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Basic Earnings per Share:
Net income	$ 12,248	$ 10,473	$ 26,127	$ 23,107
Amount allocated to participating securities	(249)	(200)	(491)	(508)
Net income available for basic common shares and basic earnings per share	11,999	10,273	25,636	22,599
Net income available for basic common shares and basic earnings per share, Shares	19,951	19,597	19,922	19,471
Net income available for basic common shares and basic earnings per share, Per Share Amount	$ 0.6	$ 0.52	$ 1.29	$ 1.16
Diluted Earnings per Share:
Net income	12,248	10,473	26,127	23,107
Amount allocated to participating securities	(249)	(200)	(491)	(508)
Adjustment for dilutive potential common shares	1	0	2	0
Adjustment for dilutive potential common shares, Shares	52	151	74	185
Net income available for diluted common shares and diluted earnings per share	$ 12,000	$ 10,273	$ 25,638	$ 22,599
Net income available for diluted common shares and diluted earnings per share, Shares	20,003	19,748	19,996	19,656
Net income available for diluted common shares and diluted earnings per share, Per Share Amount	$ 0.6	$ 0.52	$ 1.28	$ 1.15