Reportable Operating Segments (Details)	3 Months Ended								12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									6
Net sales	$ 374,910,000	$ 938,735,000	$ 542,205,000	$ 276,839,000	$ 394,130,000	$ 873,800,000	$ 501,913,000	$ 250,594,000	$ 2,132,689,000	$ 2,020,437,000	$ 1,903,339,000
(Loss) income from operations	$ 16,655,000	$ 255,766,000	$ 97,131,000	$ (31,417,000)	$ 31,604,000	$ 244,718,000	$ 90,412,000	$ (39,414,000)	338,135,000	327,320,000	222,584,000
Depreciation, amortization and accretion									38,912,000	44,941,000	48,572,000
Capital expenditures									32,455,000	29,086,000	34,813,000
Segment reconciling items
Segment Reporting Information [Line Items]
Intersegment profit									0
(Loss) income from operations									(260,216,000)	(245,738,000)	(239,270,000)
Depreciation, amortization and accretion									24,359,000	26,473,000	26,932,000
Capital expenditures									23,800,000	22,846,000	26,094,000
Wholesale | UGG brand wholesale
Segment Reporting Information [Line Items]
Net sales									892,990,000	888,347,000	841,893,000
Wholesale | HOKA brand wholesale
Segment Reporting Information [Line Items]
Net sales									277,097,000	185,057,000	132,688,000
Wholesale | Teva brand wholesale
Segment Reporting Information [Line Items]
Net sales									119,108,000	119,390,000	117,478,000
Wholesale | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Net sales									39,463,000	69,791,000	78,283,000
Wholesale | Other brands wholesale
Segment Reporting Information [Line Items]
Net sales									67,175,000	42,818,000	17,273,000
Wholesale | Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
(Loss) income from operations									303,908,000	300,761,000	247,826,000
Depreciation, amortization and accretion									611,000	1,254,000	3,193,000
Capital expenditures									404,000	205,000	58,000
Wholesale | Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
(Loss) income from operations									61,860,000	35,717,000	20,954,000
Depreciation, amortization and accretion									612,000	456,000	485,000
Capital expenditures									434,000	285,000	0
Wholesale | Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
(Loss) income from operations									30,736,000	27,939,000	20,400,000
Depreciation, amortization and accretion									1,000	10,000	12,000
Capital expenditures									0	0	0
Wholesale | Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
(Loss) income from operations									3,212,000	12,781,000	14,474,000
Depreciation, amortization and accretion									2,361,000	4,171,000	4,174,000
Capital expenditures									0	0	20,000
Wholesale | Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
(Loss) income from operations									16,087,000	10,411,000	1,304,000
Depreciation, amortization and accretion									382,000	382,000	380,000
Capital expenditures									64,000	11,000	0
Directly to Consumer | Direct-to-Consumer
Segment Reporting Information [Line Items]
Net sales									736,856,000	715,034,000	715,724,000
Directly to Consumer | Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
(Loss) income from operations									182,548,000	185,449,000	156,896,000
Depreciation, amortization and accretion									10,586,000	12,195,000	13,396,000
Capital expenditures									$ 7,753,000	$ 5,739,000	$ 8,641,000