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Components of Income before Income Taxes (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]      
Domestic $ 328,479us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 375,793us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 340,536us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign 34,971us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 51,725us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 35,036us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes $ 363,450us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 427,518us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 375,572us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments