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Income Taxes Components of Income Tax Provision (Details) (USD $)
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Income Tax Disclosure [Abstract]      
Current Federal Tax Expense (Benefit) $ 130,901,000us-gaap_CurrentFederalTaxExpenseBenefit $ 39,028,000us-gaap_CurrentFederalTaxExpenseBenefit $ 167,462,000us-gaap_CurrentFederalTaxExpenseBenefit
Current State and Local Tax Expense (Benefit) 18,193,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 9,897,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 28,461,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current Foreign Tax Expense (Benefit) 66,552,000us-gaap_CurrentForeignTaxExpenseBenefit 52,427,000us-gaap_CurrentForeignTaxExpenseBenefit 50,778,000us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit) 215,646,000us-gaap_CurrentIncomeTaxExpenseBenefit 101,352,000us-gaap_CurrentIncomeTaxExpenseBenefit 246,701,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Federal Income Tax Expense (Benefit) 25,156,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (28,640,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 378,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred State and Local Income Tax Expense (Benefit) 13,217,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (2,265,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 223,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred Foreign Income Tax Expense (Benefit) (661,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 3,050,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit (19,883,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) 37,712,000us-gaap_DeferredIncomeTaxExpenseBenefit (27,855,000)us-gaap_DeferredIncomeTaxExpenseBenefit (19,282,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit) $ 253,358,000us-gaap_IncomeTaxExpenseBenefit $ 73,497,000us-gaap_IncomeTaxExpenseBenefit $ 227,419,000us-gaap_IncomeTaxExpenseBenefit