Bank Revolving Credit Facility (Tables)

9 Months Ended

Oct. 31, 2013

Debt Disclosure [Abstract]

Available credit on the bank revolving credit facility

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

	October 31, 2013		January 31, 2013
	(in thousands)
Maximum borrowings	$	500,000	$	450,000
Less outstanding balances:
Borrowings	74,900		—
Letters of credit	60,090		67,456
Surety bonds	—		—
Available credit	$	365,010	$	382,544