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Bank Revolving Credit Facility (Tables)
 3 Months Ended
Apr. 30, 2013
Debt Disclosure [Abstract]  
Available Credit on the Bank Revolving Credit Facility
The following table summarizes the available credit on the Credit Facility:
 
April 30, 2013
January 31, 2013
 
(in thousands)
Maximum borrowings
$
465,000

$
450,000

Less outstanding balances:
 
 
Borrowings
45,000

—

Letters of credit
66,756

67,456

Surety bonds
—

—

Available credit
$
353,244

$
382,544