Reportable Operating Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			5
Net sales to external customers	$ 810,478	$ 760,345	$ 1,502,655	$ 1,420,682
(Loss) income from operations	193,191	53,250	204,290	28,954
Total assets	1,530,963		1,530,963		$ 1,191,780
Reportable segments
Segment Reporting Information [Line Items]
Total assets	790,231		790,231		606,058
Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Net sales to external customers	365,734	342,019	751,057	725,772
(Loss) income from operations	125,381	107,335	241,578	209,633
Total assets	433,588		433,588		259,444
Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Net sales to external customers	16,389	12,653	65,006	54,424
(Loss) income from operations	762	(560)	7,621	(819)
Total assets	61,605		61,605		82,505
Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Net sales to external customers	10,366	10,264	44,673	47,596
(Loss) income from operations	(350)	(119,968)	5,295	(115,998)
Total assets	68,996		68,996		80,102
Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Net sales to external customers	36,266	23,658	103,752	76,899
(Loss) income from operations	1,848	(958)	10,917	(226)
Total assets	77,783		77,783		70,607
Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Net sales to external customers	381,723	371,751	538,167	515,991
(Loss) income from operations	136,034	122,158	120,529	96,647
Total assets	148,259		148,259		$ 113,400
Unallocated overhead costs
Segment Reporting Information [Line Items]
(Loss) income from operations	$ (70,484)	$ (54,757)	$ (181,650)	$ (160,283)