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Activity of Sales Return Reserve (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Revenue Recognition, Allowances [Line Items]
Balance at beginning of year	$ 17,089urbn_SalesReturnReserve	$ 14,448urbn_SalesReturnReserve	$ 10,967urbn_SalesReturnReserve
Additions	80,390urbn_IncreaseInSalesReturnReserve	64,313urbn_IncreaseInSalesReturnReserve	49,412urbn_IncreaseInSalesReturnReserve
Deductions	(77,675)urbn_DecreaseInSalesReturnReserve	(61,672)urbn_DecreaseInSalesReturnReserve	(45,931)urbn_DecreaseInSalesReturnReserve
Balance at end of year	$ 19,804urbn_SalesReturnReserve	$ 17,089urbn_SalesReturnReserve	$ 14,448urbn_SalesReturnReserve