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Earnings Per Share (Details Textual)
3 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Dilutive options, restricted stock, performance shares and convertible securities [Member]
   
Earnings Per Share (Textual) [Abstract]    
Antidilutive securities excluded from computation of earnings per share 37,714,161  
Preferred Stock and 2018 and 2016 Senior Notes [Member]
   
Earnings Per Share (Textual) [Abstract]    
Antidilutive securities excluded from computation of earnings per share   34,294,602
Weighted-average options, restricted stock and performance shares [Member]
   
Earnings Per Share (Textual) [Abstract]    
Antidilutive securities excluded from computation of earnings per share 4,145,971 4,485,328