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Earnings Per Share (Details Textual)
3 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Series A Preferred Stock [Member]
   
Earnings Per Share (Textual) [Abstract]    
Weighted-average share issuable upon conversion 14,550,257 14,550,257
Dilutive Options, restricted stock and convertible securities [Member]
   
Earnings Per Share (Textual) [Abstract]    
Shares excluded from computation of earnings per shares 4,485,328 3,443,125
Conversion of 2018 and 2016 Notes [Member]
   
Earnings Per Share (Textual) [Abstract]    
Shares excluded from computation of earnings per shares 19,744,345