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Components of Provision for Income Tax Expense or Benefit (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Schedule Of Income Loss From Continuing Operations [Line Items]      
Current, Federal $ 109,978us-gaap_CurrentFederalTaxExpenseBenefit $ 139,848us-gaap_CurrentFederalTaxExpenseBenefit $ 93,625us-gaap_CurrentFederalTaxExpenseBenefit
Current, State 19,665us-gaap_CurrentStateAndLocalTaxExpenseBenefit 20,530us-gaap_CurrentStateAndLocalTaxExpenseBenefit 15,746us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current, Foreign 3,600us-gaap_CurrentForeignTaxExpenseBenefit 13,285us-gaap_CurrentForeignTaxExpenseBenefit 6,639us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax expense, total 133,243us-gaap_CurrentIncomeTaxExpenseBenefit 173,663us-gaap_CurrentIncomeTaxExpenseBenefit 116,010us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred, Federal (3,295)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (15,171)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 23,285us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred, State 1,372us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (6,225)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (722)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred, Foreign (298)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (7,109)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (315)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred income tax expense (benefit), total (2,221)us-gaap_DeferredIncomeTaxExpenseBenefit (28,505)us-gaap_DeferredIncomeTaxExpenseBenefit 22,248us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit), total $ 131,022us-gaap_IncomeTaxExpenseBenefit $ 145,158us-gaap_IncomeTaxExpenseBenefit $ 138,258us-gaap_IncomeTaxExpenseBenefit