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Net Income per Common Share - Additional information (Detail Textuals)	3 Months Ended	9 Months Ended
	Oct. 31, 2013	Oct. 31, 2013	Oct. 31, 2012
Earnings Per Share [Abstract]
Common stock excluded from the diluted net income per share calculation	171,511	125,962
Common stock issued in connection with exercise or vesting of equity awards		275,089	245,393

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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