Reportable Operating Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			6
Net sales	$ 721,902	$ 623,525	$ 1,226,580	$ 906,694
Income (loss) from operations	128,181	128,604	190,013	120,905
Total assets	2,410,432		2,410,432		$ 2,167,705
Unallocated cash and cash equivalents	746,211		746,211		1,089,361
Unallocated deferred tax assets, net	39,580		39,580		37,194
Reportable segments
Segment Reporting Information [Line Items]
Total assets	1,232,849		1,232,849		721,060
Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Total assets	736,080		736,080		212,277
Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
Total assets	171,783		171,783		168,365
Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Total assets	43,390		43,390		87,284
Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Total assets	33,437		33,437		38,311
Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Total assets	50,932		50,932		18,732
Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Total assets	197,227		197,227		196,091
Segment reconciling items
Segment Reporting Information [Line Items]
Income (loss) from operations	(90,137)	(71,002)	(170,803)	(126,648)
Unallocated cash and cash equivalents	746,211		746,211		1,089,361
Unallocated deferred tax assets, net	39,580		39,580		37,194
Corporate
Segment Reporting Information [Line Items]
Unallocated other corporate assets	391,792		391,792		$ 320,090
Wholesale | UGG brand wholesale
Segment Reporting Information [Line Items]
Net sales	348,776	291,994	483,832	335,422
Wholesale | HOKA brand wholesale
Segment Reporting Information [Line Items]
Net sales	146,980	108,117	298,127	178,736
Wholesale | Teva brand wholesale
Segment Reporting Information [Line Items]
Net sales	19,211	17,746	62,570	39,157
Wholesale | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Net sales	7,020	6,085	17,402	13,313
Wholesale | Other brands wholesale
Segment Reporting Information [Line Items]
Net sales	23,253	27,672	27,559	28,307
Wholesale | Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations	121,701	106,726	157,539	102,991
Wholesale | Reportable segments | HOKA brand wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations	43,294	33,826	89,657	51,061
Wholesale | Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations	4,908	4,762	19,411	8,964
Wholesale | Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations	1,523	1,139	4,927	1,627
Wholesale | Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Income (loss) from operations	8,158	9,869	10,865	8,599
Direct-to-Consumer | Direct-to-Consumer
Segment Reporting Information [Line Items]
Net sales	176,662	171,911	337,090	311,759
Direct-to-Consumer | Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Income (loss) from operations	$ 38,734	$ 43,284	$ 78,417	$ 74,311