Reportable Operating Segments (Details)	3 Months Ended								12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									6
Net sales	$ 394,130,000	$ 873,800,000	$ 501,913,000	$ 250,594,000	$ 400,684,000	$ 810,478,000	$ 482,460,000	$ 209,717,000	$ 2,020,437,000	$ 1,903,339,000	$ 1,790,147,000
(Loss) income from operations	31,604,000	$ 244,718,000	$ 90,412,000	$ (39,414,000)	18,294,000	$ 193,191,000	$ 67,355,000	$ (56,256,000)	327,320,000	222,584,000	(1,919,000)
Depreciation, amortization and accretion									44,941,000	48,572,000	52,628,000
Capital expenditures									29,086,000	34,813,000	44,499,000
Total assets	1,427,206,000				1,264,379,000				1,427,206,000	1,264,379,000
Unallocated deferred tax assets	30,870,000				38,381,000				30,870,000	38,381,000
Reportable segments
Segment Reporting Information [Line Items]
Total assets	592,342,000				582,360,000				592,342,000	582,360,000
Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Total assets	240,411,000				229,894,000				240,411,000	229,894,000
Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
Total assets	94,157,000				65,943,000				94,157,000	65,943,000
Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Total assets	76,370,000				85,980,000				76,370,000	85,980,000
Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Total assets	71,285,000				79,322,000				71,285,000	79,322,000
Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Total assets	14,618,000				8,866,000				14,618,000	8,866,000
Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Total assets	95,501,000				112,355,000				95,501,000	112,355,000
Segment reconciling items
Segment Reporting Information [Line Items]
Intersegment profit									0
(Loss) income from operations									(245,738,000)	(239,270,000)	(226,162,000)
Depreciation, amortization and accretion									26,473,000	26,932,000	27,779,000
Capital expenditures									22,846,000	26,094,000	25,587,000
Unallocated cash and cash equivalents	589,692,000				429,970,000				589,692,000	429,970,000
Unallocated deferred tax assets	30,870,000				38,381,000				30,870,000	38,381,000
Unallocated other corporate assets	$ 214,302,000				$ 213,668,000				214,302,000	213,668,000
Wholesale | Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Net sales									888,347,000	841,893,000	826,355,000
(Loss) income from operations									300,761,000	247,826,000	213,407,000
Depreciation, amortization and accretion									1,254,000	3,193,000	3,167,000
Capital expenditures									205,000	58,000	3,444,000
Wholesale | Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
Net sales									185,057,000	132,688,000	93,064,000
(Loss) income from operations									35,717,000	20,954,000	2,556,000
Depreciation, amortization and accretion									456,000	485,000	590,000
Capital expenditures									285,000	0	191,000
Wholesale | Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Net sales									119,390,000	117,478,000	103,694,000
(Loss) income from operations									27,939,000	20,400,000	10,045,000
Depreciation, amortization and accretion									10,000	12,000	24,000
Capital expenditures									0	0	0
Wholesale | Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Net sales									69,791,000	78,283,000	77,552,000
(Loss) income from operations									12,781,000	14,474,000	(110,582,000)
Depreciation, amortization and accretion									4,171,000	4,174,000	5,018,000
Capital expenditures									0	20,000	0
Wholesale | Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Net sales									42,818,000	17,273,000	23,142,000
(Loss) income from operations									10,411,000	1,304,000	(985,000)
Depreciation, amortization and accretion									382,000	380,000	381,000
Capital expenditures									11,000	0	0
Directly to Consumer | Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Net sales									715,034,000	715,724,000	666,340,000
(Loss) income from operations									185,449,000	156,896,000	109,802,000
Depreciation, amortization and accretion									12,195,000	13,396,000	15,669,000
Capital expenditures									$ 5,739,000	$ 8,641,000	$ 15,277,000