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Net Income per Share (Antidiluted Securities Excluded from Computation) (Details)	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount (in options and restricted units)	257,216.000	600,457.000

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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