CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Common Stock Held in Treasury	Total
Balance at Jan. 31, 2015	$ 230	$ 328,885	$ (10,105)	$ 446,147	$ (3,899)	$ 761,258
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards exercised/vested, net	(1)	(838)			1,256	417
Share-based compensation expense		15,576				15,576
Tax benefit from exercise/vesting of equity awards		10,127				10,127
Effect of exchange rate changes			(13,584)			(13,584)
Net income				114,333		114,333
Balance at Jan. 31, 2016	229	353,750	(23,689)	560,480	(2,643)	888,127
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards exercised/vested, net	(2)	(892)			1,153	259
Share-based compensation expense		16,901				16,901
Adjustments related to tax withholding for share-based compensation		(6,956)				(6,956)
Shares issued to LVMH in connection with the DKI Acquisition	26	74,974				75,000
Effect of exchange rate changes			(4,033)			(4,033)
Net income				51,938		51,938
Balance at Jan. 31, 2017	253	437,777	(27,722)	612,418	(1,490)	1,021,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards exercised/vested, net	(8)	516			1,070	1,578
Share-based compensation expense		19,665				19,665
Adjustments related to tax withholding for share-based compensation		(6,114)				(6,114)
Effect of exchange rate changes			22,200			22,200
Net income				62,124		62,124
Balance at Jan. 31, 2018	$ 245	$ 451,844	$ (5,522)	$ 674,542	$ (420)	$ 1,120,689