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Net Income per Common Share (Details Textual)	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Net Income per Common Share (Textual) [Abstract]
Antidilutive shares excluded from the diluted per share calculation	245,393	0	154,777	0
Common stock issued in connection with the exercise or vesting of equity awards			311,388	203,790

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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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Number of share options (or share units) exercised during the current period.

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