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Net Income per Common Share (Details Textual)	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Diluted and Anti-diluted Net Income Per Share (Textual) [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share	78,000	0	78,000	0
Common stock issued in connection with the exercise or vesting of equity awards			245,297	199,240

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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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