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Activity of sales Return Reserve (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Revenue Recognition Allowances [Abstract] |  |  |
Balance at beginning of year | $ 24,882 | $ 24,385 | $ 19,804
Additions | 115,353 | 105,909 | 96,707
Deductions | (111,333) | (105,412) | (92,126)
Balance at end of year | $ 28,902 | $ 24,882 | $ 24,385

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- Definition Decrease In Sales Return Reserve + References No definition available. + Details
Name: | urbn_DecreaseInSalesReturnReserve
Namespace Prefix: | urbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase In Sales Return Reserve + References No definition available. + Details
Name: | urbn_IncreaseInSalesReturnReserve
Namespace Prefix: | urbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue recognition allowances. + References No definition available. + Details
Name: | urbn_RevenueRecognitionAllowancesAbstract
Namespace Prefix: | urbn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Sales Return Reserve + References No definition available. + Details
Name: | urbn_SalesReturnReserve
Namespace Prefix: | urbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant