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Bank Revolving Credit Facility (Details) (USD $)
Jul. 31, 2013
Jan. 31, 2013
Debt Disclosure [Abstract]    
Maximum borrowings   $ 450,000,000
Borrowings 0 0
Letters of credit 56,920,000 67,456,000
Surety bonds 0 0
Reserve for retirement of indebtedness 132,144,000 [1] 0
Available credit $ 310,936,000 $ 382,544,000
[1] On August 23, 2013, this reserve for retirement of indebtedness was removed in conjunction with the redemption of the 6.500% Senior Notes due 2017 (See Note D – Senior and Subordinated Debt)