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Net Income per Common Share - Additional Information (Detail) (USD $)
3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive common shares 100,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 947,950us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Anti-dilutive common shares exercise price, minimum   $ 37.02urbn_AntiDilutiveCommonShareExercisePriceLowerRangeLimit
Anti-dilutive common shares exercise price, maximum   $ 46.02urbn_AntiDilutiveCommonShareExercisePriceUpperRangeLimit
Anti-dilutive common shares exercise price $ 46.02us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount  
Performance Stock Units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive common shares 1,939,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_PerformanceSharesMember
1,742,033us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_PerformanceSharesMember