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Bank Revolving Credit Facility (Tables)
6 Months Ended
Jul. 31, 2011
Bank Revolving Credit Facility (Tables) [Abstract]  
Available Credit on the Bank Revolving Credit Facility
The following table summarizes the available credit on the bank revolving credit facility:
                 
    July 31, 2011     January 31, 2011  
    (in thousands)  
Maximum borrowings
  $ 450,000     $ 470,336  
Less outstanding balances and reserves:
               
Borrowings
    -       137,152  
Letters of credit
    67,896       63,418  
Surety bonds
    -       -  
Reserve for retirement of debt
    121,413       46,891  
     
Available credit
  $ 260,691     $ 222,875