Bank Revolving Credit Facility (Tables)

6 Months Ended

Jul. 31, 2012

Debt Disclosure [Abstract]

Available Credit on the Bank Revolving Credit Facility

The following table summarizes the available credit on the Credit Facility:

	July 31, 2012		January 31, 2012
	(in thousands)
Maximum borrowings	$	450,000	$	450,000
Less outstanding balances:
Borrowings	—		—
Letters of credit	70,646		69,389
Surety bonds	—		—
Available credit	$	379,354	$	380,611