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Fair Value Measurements (Tables)
6 Months Ended
Jul. 31, 2011
Fair Value Measurements (Tables) [Abstract]  
Company's financial assets and liabilities and redeemable noncontrolling interests on a recurring basis
                                 
    Fair Value Measurements  
    at July 31, 2011  
    Level 1     Level 2     Level 3     Total  
            (in thousands)          
Interest rate caps
  $ -     $ 40     $ -     $ 40  
Interest rate swap agreements (positive fair value)
    -       1,523       -       1,523  
Interest rate swap agreements (negative fair value)
    -       (7,088 )     (121,459 )     (128,547 )
TRS (positive fair value)
    -       -       3,839       3,839  
TRS (negative fair value)
    -       -       (24,052 )     (24,052 )
Fair value adjustment to the borrowings subject to TRS
    -       -       13,571       13,571  
Redeemable noncontrolling interest
    -       -       (226,936 )     (226,936 )
 
                       
Total
  $ -     $ (5,525 )   $ (355,037 )   $ (360,562 )
 
                       
Reconciliation of financial assets and liabilities and redeemable noncontrolling interest measured at fair value on a recurring basis using significant unobservable inputs
The table below presents a reconciliation of all financial assets and liabilities and redeemable noncontrolling interest measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
                                                 
    Fair Value Measurements  
    Six Months Ended July 31, 2011  
                    (in thousands)              
                            Fair value              
    Redeemable                     adjustment to              
    Noncontrolling     Interest Rate     Net     the borrowings     Total TRS        
    Interest     Swaps     TRS     subject to TRS     Related     Total  
Balance, February 1, 2011
  $ (226,829 )   $ (102,387 )   $ (30,034 )   $ 21,938     $ (8,096 )   $ (337,312 )
Total realized and unrealized gains (losses):
                                               
Included in earnings
    1,879       -       8,918       (7,464 )     1,454       3,333  
Included in other comprehensive income
    -       (19,072 )     -       -       -       (19,072 )
Included in additional paid-in capital
    (1,986 )     -       -       -       -       (1,986 )
Settlement
    -       -       903       (903 )     -       -  
 
                               
 
                                             
Balance, July 31, 2011
  $ (226,936 )   $ (121,459 )   $ (20,213 )   $ 13,571     $ (6,642 )   $ (355,037 )