CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net revenue	$ 1,248,738	$ 480,840	$ 2,129,387	$ 1,342,618
Cost of goods sold	898,484	267,983	1,264,730	709,100
Gross profit	350,254	212,857	864,657	633,518
Selling and marketing	161,322	79,513	313,793	208,641
General and administrative	70,638	65,951	205,693	187,378
Research and development	62,305	49,977	173,582	142,245
Depreciation and amortization	10,140	7,864	29,151	34,490
Business reorganization	(5,930)	700	(6,172)	13,012
Total operating expenses	298,475	204,005	716,047	585,766
Income from operations	51,779	8,852	148,610	47,752
Interest and other, net	8,071	3,374	19,647	(2,403)
Income before income taxes	59,850	12,226	168,257	45,349
Benefit from income taxes	120,098	12,914	108,750	37,331
Net income	$ 179,948	$ 25,140	$ 277,007	$ 82,680	[1]
Earnings per share:
Basic earnings per share (in dollars per share)	$ 1.59	$ 0.22	$ 2.44	$ 0.76
Diluted earnings per share (in dollars per share)	$ 1.57	$ 0.21	$ 2.41	$ 0.74

[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.