QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019		Mar. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 760,541	$ 930,129	$ 857,841	$ 540,459	$ 539,007	$ 1,248,738	$ 492,667	$ 387,982	$ 3,088,970	$ 2,668,394		$ 1,792,892
Gross profit	364,901	493,036	389,593	298,990	280,092	350,254	257,787	256,617	1,546,520	1,144,750		894,581
Income from operations	121,884	176,833	74,820	51,730	58,061	51,779	25,986	70,846	425,267	206,672		135,577
Net income	$ 122,722	$ 163,642	$ 71,815	$ 46,280	$ 56,829	$ 179,948	$ 25,367	$ 71,693	$ 404,459	$ 333,837	[1]	$ 173,533	[1]
Earnings per share:
Basic earnings per share (in dollars per share)	$ 1.08	$ 1.44	$ 0.63	$ 0.41	$ 0.50	$ 1.59	$ 0.22	$ 0.63	$ 3.58	$ 2.95		$ 1.57
Diluted earnings per share (in dollars per share)	$ 1.07	$ 1.43	$ 0.63	$ 0.41	$ 0.50	$ 1.57	$ 0.22	$ 0.62	$ 3.54	$ 2.90		$ 1.54

[1] Prior period amounts have been adjusted retrospectively to reflect the adoption of ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. Refer to Note 1 for further discussion.