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Senior and Subordinated Debt (Details) (USD $)
Apr. 30, 2013
Jan. 31, 2013
Senior Notes    
Total Senior Notes $ 812,335,000 $ 1,003,969,000
Subordinated Debt [Abstract]    
Senior and Subordinated debt 841,335,000 1,032,969,000
Puttable Equity-Linked Senior Notes due 2014 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 3.625% 3.625%
Senior Notes    
Total Senior Notes 61,006,000 199,457,000
Senior Notes due 2015 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 7.625% 7.625%
Senior Notes    
Total Senior Notes 0 53,253,000
Convertible Senior Notes due 2016 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 5.00% 5.00%
Senior Notes    
Total Senior Notes 50,000,000 50,000,000
Senior Notes due 2017 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 6.50% 6.50%
Senior Notes    
Total Senior Notes 132,144,000 132,144,000
Convertible Senior Notes due 2018 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 4.25% 4.25%
Senior Notes    
Total Senior Notes 350,000,000 350,000,000
Senior Notes due 2034 [Member]
   
Debt Instrument [Line Items]    
Interest Rate 7.375% 7.375%
Senior Notes    
Total Senior Notes 219,185,000 219,115,000
Subordinate Tax Revenue Bonds due 2013 [Member]
   
Subordinated Debt [Abstract]    
Subordinate Tax Revenue Bonds due 2013 $ 29,000,000 $ 29,000,000