Segments - Information regarding reportable segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 633,552	$ 611,743
Cost of goods sold	397,488	377,216
Gross profit	236,064	234,527
Selling, general and administrative expenses	201,859	202,071
Depreciation and amortization	9,473	9,380
Gain on lease terminations	(829)
Operating profit (loss)	25,561	23,076
Operating Segments | Wholesale operations
Segment Reporting Information [Line Items]
Net sales	570,639	527,673
Cost of goods sold	371,580	341,575
Gross profit	199,059	186,098
Selling, general and administrative expenses	147,258	136,413
Depreciation and amortization	7,522	7,136
Operating profit (loss)	44,279	42,549
Operating Segments | Retail
Segment Reporting Information [Line Items]
Net sales	81,904	104,519
Cost of goods sold	44,899	56,090
Gross profit	37,005	48,429
Selling, general and administrative expenses	54,601	65,658
Depreciation and amortization	1,951	2,244
Gain on lease terminations	(829)
Operating profit (loss)	(18,718)	(19,473)
Elimination
Segment Reporting Information [Line Items]
Net sales	(18,991)	(20,449)
Cost of goods sold	$ (18,991)	$ (20,449)