Reportable Operating Segments - Schedule of Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 561,188	$ 1,077,759	$ 623,525	$ 283,169	$ 374,910	$ 938,735	$ 542,205	$ 276,839	$ 2,545,641	$ 2,132,689	$ 2,020,437
Income (loss) from operations	$ 54,645	$ 328,655	$ 128,604	$ (7,699)	$ 16,655	$ 255,766	$ 97,131	$ (31,417)	504,205	338,135	327,320
Depreciation, amortization, and accretion									40,530	38,912	44,941
Capital expenditures									32,218	32,455	29,086
Segment reconciling items
Segment Reporting Information [Line Items]
Income (loss) from operations									(297,717)	(260,216)	(245,738)
Depreciation, amortization, and accretion									26,157	24,359	26,473
Capital expenditures									21,711	23,800	22,846
Wholesale | UGG brand wholesale
Segment Reporting Information [Line Items]
Net sales									871,799	892,990	888,347
Wholesale | HOKA brand wholesale
Segment Reporting Information [Line Items]
Net sales									405,243	277,097	185,057
Wholesale | Teva brand wholesale
Segment Reporting Information [Line Items]
Net sales									105,928	119,108	119,390
Wholesale | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Net sales									26,566	39,463	69,791
Wholesale | Other brands wholesale
Segment Reporting Information [Line Items]
Net sales									69,375	67,175	42,818
Wholesale | Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations									292,718	303,908	300,761
Depreciation, amortization, and accretion									532	611	1,254
Capital expenditures									(31)	404	205
Wholesale | Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations									111,208	61,860	35,717
Depreciation, amortization, and accretion									611	612	456
Capital expenditures									56	434	285
Wholesale | Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations									27,120	30,736	27,939
Depreciation, amortization, and accretion									0	1	10
Wholesale | Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations									(162)	3,212	12,781
Depreciation, amortization, and accretion									1,727	2,361	4,171
Capital expenditures									8	0	0
Wholesale | Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations									21,573	16,087	10,411
Depreciation, amortization, and accretion									382	382	382
Capital expenditures									40	64	11
Direct-to-Consumer | Direct-to-Consumer
Segment Reporting Information [Line Items]
Net sales									1,066,730	736,856	715,034
Direct-to-Consumer | Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Income (loss) from operations									349,465	182,548	185,449
Depreciation, amortization, and accretion									11,121	10,586	12,195
Capital expenditures									$ 10,434	$ 7,753	$ 5,739