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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013	Apr. 30, 2013
Summary Of Significant Accounting Policies [Line Items]
Amortized cost of available-for-sale securities	$ 208,587us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 647,483us-gaap_AvailableForSaleSecuritiesAmortizedCost
Estimated fair value of available-for-sale securities	208,694us-gaap_AvailableForSaleSecurities	648,235us-gaap_AvailableForSaleSecurities
Advertising costs reported as prepaid expenses	2,146us-gaap_PrepaidAdvertising	2,067us-gaap_PrepaidAdvertising
Advertising expense	103,882us-gaap_AdvertisingExpense	91,615us-gaap_AdvertisingExpense	81,944us-gaap_AdvertisingExpense
Foreign currency translation losses	(14,128)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	7,194us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	1,455us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Long Term Investments
Summary Of Significant Accounting Policies [Line Items]
Amortized cost of available-for-sale securities	104,386us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = urbn_LongTermInvestmentsMember	365,809us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = urbn_LongTermInvestmentsMember
Estimated fair value of available-for-sale securities	104,448us-gaap_AvailableForSaleSecurities / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = urbn_LongTermInvestmentsMember	366,422us-gaap_AvailableForSaleSecurities / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = urbn_LongTermInvestmentsMember
Accumulated Other Comprehensive Income (Loss)
Summary Of Significant Accounting Policies [Line Items]
Foreign currency translation losses	(15,516)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(1,388)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Unrealized gains / (losses) on marketable securities, net of tax	89us-gaap_MarketableSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	420us-gaap_MarketableSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Change in unrealized gains / (losses) on marketable securities, tax	(201)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(378)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(672)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Furniture and Fixtures
Summary Of Significant Accounting Policies [Line Items]
Average useful life (in years)	5 years
Leasehold Improvements
Summary Of Significant Accounting Policies [Line Items]
Depreciable life (in years)	Lesser of the lease term or useful life for leasehold improvements
Equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Average useful life (in years)	3 years
Equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Average useful life (in years)	10 years
Building
Summary Of Significant Accounting Policies [Line Items]
Average useful life (in years)	39 years
Auction Rate Securities
Summary Of Significant Accounting Policies [Line Items]
Proceeds from sale of available-for-sale securities				4,580us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Auction Rate Securities | Long Term Investments
Summary Of Significant Accounting Policies [Line Items]
Amortized cost of available-for-sale securities			4,925us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = urbn_LongTermInvestmentsMember
Estimated fair value of available-for-sale securities			$ 4,330us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = urbn_LongTermInvestmentsMember

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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