Segments - Information regarding reportable segments (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Oct. 31, 2018	Oct. 31, 2017		Oct. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Net sales		$ 1,072,982	$ 1,024,993	[1]	$ 2,309,423	$ 2,092,040	[1]
Cost of goods sold		690,882	633,897	[2]	1,461,252	1,296,239	[2]
Gross profit		382,100	391,096		848,171	795,801
Selling, general and administrative expenses		232,052	242,740		632,983	636,000
Depreciation and amortization		10,033	6,906		28,868	27,480
Operating profit (loss)		140,015	141,450		186,320	132,321
Operating Segments | Wholesale
Segment Reporting Information [Line Items]
Net sales		1,005,358	966,820	[1]	2,077,628	1,887,902	[1]
Cost of goods sold		677,011	636,636	[2]	1,381,342	1,251,372	[2]
Gross profit		328,347	330,184		696,286	636,530
Selling, general and administrative expenses		166,423	174,679		439,014	433,323
Depreciation and amortization		7,709	6,790		22,192	20,403
Operating profit (loss)		154,215	148,715		235,080	182,804
Operating Segments | Retail
Segment Reporting Information [Line Items]
Net sales		110,934	118,709	[1]	322,115	324,329	[1]
Cost of goods sold		57,181	57,797	[2]	170,230	165,058	[2]
Gross profit		53,753	60,912		151,885	159,271
Selling, general and administrative expenses		65,629	68,061		193,969	202,677
Depreciation and amortization		2,324	116		6,676	7,077
Operating profit (loss)		(14,200)	(7,265)		(48,760)	(50,483)
Elimination
Segment Reporting Information [Line Items]
Net sales	[3]	(43,310)	(60,536)	[1]	(90,320)	(120,191)	[1]
Cost of goods sold	[3]	$ (43,310)	$ (60,536)	[2]	$ (90,320)	$ (120,191)	[2]

[1] Certain reclassifications have been made between the wholesale operations segment and the elimination column as a result of sales eliminations within the wholesale operations segment being misclassified as inter-segment eliminations.

[2] Certain reclassifications have been made as a result of the Company’s reclassifying the impact of certain components of foreign currency gain (loss) from cost of goods sold and interest expense to other income.

[3] Represents intersegment sales to the Company’s retail operations segment.