Quarterly Summary of Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Summarized unaudited quarterly financial data
Net sales	$ 400,684	$ 810,478	$ 482,460	$ 209,717	$ 369,465	$ 760,345	$ 485,944	$ 174,393	$ 1,903,339	$ 1,790,147	$ 1,875,197
Gross profit	192,429	423,471	225,117	90,625	158,924	383,634	216,425	76,252	931,642	835,235	846,668
(Loss) income from operations	18,294	193,191	67,355	(56,256)	(30,873)	53,250	54,023	(78,319)	$ 222,584	$ (1,919)	$ 162,127
Net (loss) income	$ 20,615	$ 86,341	$ 49,559	$ (42,121)	$ (15,704)	$ 41,027	$ 39,305	$ (58,918)
Net income per share:
Basic (in dollars per share)	$ 0.66	$ 2.71	$ 1.55	$ (1.32)	$ (0.49)	$ 1.28	$ 1.23	$ (1.84)	$ 3.60	$ 0.18	$ 3.76
Diluted (in dollars per share)	$ 0.66	$ 2.69	$ 1.54	$ (1.32)	$ (0.49)	$ 1.27	$ 1.21	$ (1.84)	$ 3.58	$ 0.18	$ 3.70
Condensed Financial Statements, Captions [Line Items]
Restructuring charges									$ 1,667	$ 28,984	$ 24,673
Impairment of goodwill									$ 0	$ 113,944	$ 0
Sanuk
Condensed Financial Statements, Captions [Line Items]
Impairment of goodwill						$ 113,944
Patents | Sanuk
Condensed Financial Statements, Captions [Line Items]
Impairment of intangible assets (excluding goodwill)						$ 4,086