CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net revenue	$ 492,667	$ 443,562	$ 880,649	$ 861,778
Cost of goods sold	234,880	246,548	366,245	441,117
Gross profit	257,787	197,014	514,404	420,661
Selling and marketing	94,165	76,914	152,471	129,128
General and administrative	67,320	60,824	135,055	121,427
Research and development	60,565	49,999	111,277	92,268
Depreciation and amortization	9,751	18,883	19,011	26,626
Business reorganization	0	1,713	(242)	12,312
Total operating expenses	231,801	208,333	417,572	381,761
Income (loss) from operations	25,986	(11,319)	96,832	38,900
Interest and other, net	4,975	(2,969)	11,576	(5,777)
Income (loss) before income taxes	30,961	(14,288)	108,408	33,123
Provision for (benefit from) income taxes	5,594	(11,552)	11,348	(24,417)
Net income (loss)	$ 25,367	$ (2,736)	$ 97,060	$ 57,540	[1]
Earnings per share:
Basic earnings (loss) per share (in dollars per share)	$ 0.22	$ (0.03)	$ 0.86	$ 0.54
Diluted earnings (loss) per share (in dollars per share)	$ 0.22	$ (0.03)	$ 0.84	$ 0.53

[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.