Reportable Operating Segments (Details)	3 Months Ended
	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	6
Net sales	$ 276,839,000	$ 250,594,000
(Loss) income from operations	(31,417,000)	(39,414,000)
Total assets	1,751,056,000		$ 1,427,206,000
Unallocated cash and cash equivalents	502,626,000		589,692,000
Unallocated deferred tax assets, net	32,964,000		30,870,000
Reportable segments
Segment Reporting Information [Line Items]
Total assets	904,214,000		592,342,000
Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Total assets	422,189,000		240,411,000
Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
Total assets	106,810,000		94,157,000
Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Total assets	56,601,000		76,370,000
Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Total assets	54,414,000		71,285,000
Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Total assets	36,152,000		14,618,000
Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Total assets	228,048,000		95,501,000
Segment reconciling items
Segment Reporting Information [Line Items]
Intersegment profit	0
(Loss) income from operations	(58,027,000)	(56,201,000)
Unallocated cash and cash equivalents	502,626,000		589,692,000
Unallocated deferred tax assets, net	32,964,000		30,870,000
Unallocated other corporate assets	311,252,000		$ 214,302,000
Wholesale | Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Net sales	85,400,000	81,353,000
(Loss) income from operations	9,441,000	5,869,000
Wholesale | Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
Net sales	64,006,000	39,954,000
(Loss) income from operations	11,358,000	5,728,000
Wholesale | Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Net sales	30,831,000	33,196,000
(Loss) income from operations	8,316,000	8,064,000
Wholesale | Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Net sales	14,607,000	20,503,000
(Loss) income from operations	1,935,000	4,200,000
Wholesale | Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Net sales	1,727,000	2,637,000
(Loss) income from operations	132,000	350,000
Directly to Consumer | Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Net sales	80,268,000	72,951,000
(Loss) income from operations	$ (4,572,000)	$ (7,424,000)