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Net Income per Common Share - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive common shares | 1,015,895 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 151,625 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 2,440,525 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Anti-dilutive common shares exercise price, minimum | $ 35.12 urbn_AntiDilutiveCommonShareExercisePriceLowerRangeLimit | $ 37.65 urbn_AntiDilutiveCommonShareExercisePriceLowerRangeLimit | $ 28.49 urbn_AntiDilutiveCommonShareExercisePriceLowerRangeLimit
Anti-dilutive common shares exercise price, maximum | $ 46.02 urbn_AntiDilutiveCommonShareExercisePriceUpperRangeLimit | $ 46.02 urbn_AntiDilutiveCommonShareExercisePriceUpperRangeLimit | $ 39.58 urbn_AntiDilutiveCommonShareExercisePriceUpperRangeLimit
Contingently issuable awards | 2,216,899 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | 1,752,200 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 55 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2626-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 48 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2538-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingently Issuable Shares -URI http://asc.fasb.org/extlink&oid=6508586 + Details
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