CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net revenue	$ 857,841	$ 492,667	$ 1,398,300	$ 880,649
Cost of goods sold	468,248	234,880	709,717	366,245
Gross profit	389,593	257,787	688,583	514,404
Selling and marketing	149,566	94,165	241,387	152,471
General and administrative	76,659	67,320	151,492	135,055
Research and development	76,197	60,565	145,160	111,277
Depreciation and amortization	12,024	9,751	23,281	19,011
Business reorganization	327	0	713	(242)
Total operating expenses	314,773	231,801	562,033	417,572
Income from operations	74,820	25,986	126,550	96,832
Interest and other, net	8,054	4,975	18,479	11,576
Income before income taxes	82,874	30,961	145,029	108,408
Provision for income taxes	11,059	5,594	26,934	11,348
Net income	$ 71,815	$ 25,367	$ 118,095	$ 97,060
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.63	$ 0.22	$ 1.05	$ 0.86
Diluted earnings per share (in dollars per share)	$ 0.63	$ 0.22	$ 1.04	$ 0.84