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Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Jan. 31, 2015 Store	Jan. 31, 2014	Jan. 31, 2013	Nov. 27, 2012
Commitments and Contingencies Disclosure [Line Items]
Number of lease commitment not opened	22urbn_NumberOfLeaseCommitmentNotOpened
Commitments for un-fulfilled purchase orders	$ 466,008,000urbn_CommitmentsFromVendorsForUnFulfilledPurchaseOrders
Commitments with construction contractors	12,056,000urbn_CommitmentsForContractsWithConstructionContractors
U.S. based employees age limit to participate in 401(k) Saving Plan	18 years
Employer matching contribution per employee	0.25urbn_DeferredCompensationPerOneDollarContributionsMatchedOverFirstSixPercentContributions
Percentage of employee contribution for first threshold limit of employer contribution	6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Employees contribution percentage vested	100.00%urbn_EmployeeContributionPercentageVestedAtPercentageOfEmployersContributionPerYear
Percentage of employers contribution per year vested	20.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Company's contribution to Savings Plan	1,708,000us-gaap_DefinedContributionPlanCostRecognized	1,770,000us-gaap_DefinedContributionPlanCostRecognized	1,483,000us-gaap_DefinedContributionPlanCostRecognized
Nonqualified Deferred Compensation Plan
Commitments and Contingencies Disclosure [Line Items]
Employer matching contribution per employee				0.25urbn_DeferredCompensationPerOneDollarContributionsMatchedOverFirstSixPercentContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = urbn_NonqualifiedDeferredCompensationPlanMember
Percentage of employee contribution for first threshold limit of employer contribution				6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = urbn_NonqualifiedDeferredCompensationPlanMember
Employees contribution percentage vested				100.00%urbn_EmployeeContributionPercentageVestedAtPercentageOfEmployersContributionPerYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = urbn_NonqualifiedDeferredCompensationPlanMember
Percentage of employers contribution per year vested				100.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = urbn_NonqualifiedDeferredCompensationPlanMember
Company's contribution to Savings Plan	100,000us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = urbn_NonqualifiedDeferredCompensationPlanMember
Deferred compensation obligation	3,778,000us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = urbn_NonqualifiedDeferredCompensationPlanMember
Aggregate market value of investments	$ 3,778,000us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = urbn_NonqualifiedDeferredCompensationPlanMember
Minimum
Commitments and Contingencies Disclosure [Line Items]
Operating lease, renewal option	5 years
Percentage of compensation deferred by employees under Saving Plan	1.00%urbn_PercentageOfCompensationDeferredByEmployeeUnderBenefitPlan / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Commitments and Contingencies Disclosure [Line Items]
Operating lease, renewal option	10 years
Percentage of compensation deferred by employees under Saving Plan	25.00%urbn_PercentageOfCompensationDeferredByEmployeeUnderBenefitPlan / us-gaap_RangeAxis = us-gaap_MaximumMember

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Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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The amount of the cost recognized during the period for defined contribution plans.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Nominal or face amount on the investment owned.

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Term of the lessor's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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