Reportable Operating Segments (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	6
Net sales	$ 250,594	$ 209,717
(Loss) income from operations	(39,414)	(56,256)
Total assets	1,386,720		$ 1,264,379
Unallocated cash and cash equivalents	417,851	279,940	429,970	$ 291,764
Unallocated deferred tax assets	37,443		38,381
Reportable segments
Segment Reporting Information [Line Items]
Total assets	705,289		582,360
Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Total assets	375,499		229,894
Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
Total assets	77,230		65,943
Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Total assets	64,282		85,980
Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Total assets	61,676		79,322
Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Total assets	30,283		8,866
Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Total assets	96,319		112,355
Segment reconciling items
Segment Reporting Information [Line Items]
Intersegment profit	0
(Loss) income from operations	(56,201)	(53,519)
Unallocated cash and cash equivalents	417,851		429,970
Unallocated deferred tax assets	37,443		38,381
Unallocated other corporate assets	226,137		$ 213,668
Wholesale | Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Net sales	81,353	63,273
(Loss) income from operations	5,869	(1,021)
Wholesale | Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
Net sales	39,954	26,538
(Loss) income from operations	5,728	1,259
Wholesale | Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Net sales	33,196	32,123
(Loss) income from operations	8,064	4,943
Wholesale | Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Net sales	20,503	22,220
(Loss) income from operations	4,200	4,417
Wholesale | Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Net sales	2,637	427
(Loss) income from operations	350	(233)
Directly to Consumer | Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Net sales	72,951	65,136
(Loss) income from operations	$ (7,424)	$ (12,102)