Reportable Operating Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			5
Net sales to external customers	$ 482,460	$ 485,944	$ 692,177	$ 660,337
(Loss) income from operations	67,355	54,023	11,099	(24,296)
Total assets	1,520,288		1,520,288		$ 1,191,780
Reportable segments
Segment Reporting Information [Line Items]
Total assets	1,010,987		1,010,987		606,058
Reportable segments | UGG brand wholesale
Segment Reporting Information [Line Items]
Net sales to external customers	322,050	337,852	385,323	383,753
(Loss) income from operations	117,218	112,510	116,197	102,298
Total assets	712,746		712,746		259,444
Reportable segments | Teva brand wholesale
Segment Reporting Information [Line Items]
Net sales to external customers	16,494	12,246	48,617	41,771
(Loss) income from operations	1,916	(2,121)	6,859	(259)
Total assets	49,411		49,411		82,505
Reportable segments | Sanuk brand wholesale
Segment Reporting Information [Line Items]
Net sales to external customers	12,087	15,030	34,307	37,333
(Loss) income from operations	1,228	(211)	5,645	3,970
Total assets	59,583		59,583		80,102
Reportable segments | Other brands wholesale
Segment Reporting Information [Line Items]
Net sales to external customers	40,521	34,830	67,486	53,241
(Loss) income from operations	8,043	2,362	9,069	732
Total assets	70,413		70,413		70,607
Reportable segments | Direct-to-Consumer
Segment Reporting Information [Line Items]
Net sales to external customers	91,308	85,986	156,444	144,239
(Loss) income from operations	(3,403)	(6,092)	(15,505)	(25,511)
Total assets	118,834		118,834		$ 113,400
Unallocated to Segments
Segment Reporting Information [Line Items]
(Loss) income from operations	$ (57,647)	$ (52,425)	$ (111,166)	$ (105,526)