Net Income Per Common Share (Tables)

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Net Income Per Common Share (Tables)	3 Months Ended
	Apr. 30, 2011
Net Income Per Common Share (Tables) [Abstract]
Net income per basic and diluted share	Three months ended     April 30,   May 1,     2011   2010                         Net income   $ 23,296     $ 13,661                     Denominator for basic net income per share — weighted-average common shares     60,554       58,306   Dilutive effect of stock options and non-vested stock     2,204       1,970         Denominator for diluted net income per share     62,758       60,276                     Net income per common share:                 Basic   $ 0.38     $ 0.23   Diluted   $ 0.37     $ 0.23