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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Cash flows from operating activities:      
Net income $ 232,428us-gaap_NetIncomeLoss $ 282,360us-gaap_NetIncomeLoss $ 237,314us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 138,110us-gaap_DepreciationAndAmortization 132,664us-gaap_DepreciationAndAmortization 118,664us-gaap_DepreciationAndAmortization
(Benefit) provision for deferred income taxes (2,221)us-gaap_DeferredIncomeTaxExpenseBenefit (28,505)us-gaap_DeferredIncomeTaxExpenseBenefit 22,248us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock option exercises (3,822)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (9,540)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (6,713)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Share-based compensation expense 16,736us-gaap_ShareBasedCompensation 15,742us-gaap_ShareBasedCompensation 10,892us-gaap_ShareBasedCompensation
Loss on disposition of property and equipment, net 3,189us-gaap_GainLossOnSaleOfPropertyPlantEquipment 2,368us-gaap_GainLossOnSaleOfPropertyPlantEquipment 616us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Changes in assets and liabilities:      
Receivables (18,393)us-gaap_IncreaseDecreaseInReceivables (15,368)us-gaap_IncreaseDecreaseInReceivables (2,917)us-gaap_IncreaseDecreaseInReceivables
Inventories (68,992)us-gaap_IncreaseDecreaseInInventories (27,713)us-gaap_IncreaseDecreaseInInventories (32,237)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (23,257)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 2,985us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 16,057us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Payables, accrued expenses and other liabilities 48,543us-gaap_IncreaseDecreaseInOperatingLiabilities 68,162us-gaap_IncreaseDecreaseInOperatingLiabilities 31,756us-gaap_IncreaseDecreaseInOperatingLiabilities
Net cash provided by operating activities 322,321us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 423,155us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 395,680us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Cash paid for property and equipment (229,804)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (186,101)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (168,875)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash paid for marketable securities (405,659)us-gaap_PaymentsToAcquireMarketableSecurities (727,987)us-gaap_PaymentsToAcquireMarketableSecurities (372,689)us-gaap_PaymentsToAcquireMarketableSecurities
Sales and maturities of marketable securities 830,297us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 451,866us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 207,576us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Net cash provided by (used in) investing activities 194,834us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (462,222)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (333,988)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Proceeds from the exercise of stock options 10,693us-gaap_ProceedsFromStockOptionsExercised 35,218us-gaap_ProceedsFromStockOptionsExercised 30,671us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefits from stock option exercises 3,822us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 9,540us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 6,713us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Share repurchases related to share repurchase program (611,475)us-gaap_PaymentsForRepurchaseOfCommonStock (10,695)us-gaap_PaymentsForRepurchaseOfCommonStock  
Share repurchases related to taxes for share-based awards (3,947)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (397)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation  
Net cash (used in) provided by financing activities (600,907)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 33,666us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 37,384us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents (3,748)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 2,132us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 978us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
(Decrease) increase in cash and cash equivalents (87,500)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,269)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 100,054us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 242,058us-gaap_CashAndCashEquivalentsAtCarryingValue 245,327us-gaap_CashAndCashEquivalentsAtCarryingValue 145,273us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 154,558us-gaap_CashAndCashEquivalentsAtCarryingValue 242,058us-gaap_CashAndCashEquivalentsAtCarryingValue 245,327us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the year for:      
Income taxes 144,892us-gaap_IncomeTaxesPaid 159,628us-gaap_IncomeTaxesPaid 103,006us-gaap_IncomeTaxesPaid
Non-cash investing activities-Accrued capital expenditures $ 18,771us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 20,889us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 15,055us-gaap_CapitalExpendituresIncurredButNotYetPaid