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ABL Credit Facility (Details) (USD $)
Jan. 31, 2015
Letter of Credit  
Line of Credit Facility [Line Items]  
Letters of credit collateralized by the credit facility $ 60,500,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
Revolving Credit Facility  
Line of Credit Facility [Line Items]  
Total commitment 200,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Borrowings outstanding $ 0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember