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Earnings Per Share (Details Textual)	3 Months Ended		6 Months Ended
Earnings Per Share (Details Textual)	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Dilutive options, restricted stock, performance shares and convertible securities [Member]
Earnings Per Share (Textual) [Abstract]
Anti-dilutive securities excluded from computation of earnings per share	29,282,326	52,436,282	33,430,831	52,535,035
Weighted-average options, restricted stock and performance shares [Member]
Earnings Per Share (Textual) [Abstract]
Anti-dilutive securities excluded from computation of earnings per share	3,759,294	4,474,149	3,952,633	4,479,739

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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