CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net revenue	$ 1,779,748	$ 1,413,698	$ 1,082,938
Cost of goods sold	1,022,959	813,873	794,867
Gross profit	756,789	599,825	288,071
Selling and marketing	285,453	198,309	235,341
General and administrative	211,409	192,452	175,093
Research and development	137,915	119,807	115,043
Business reorganization	0	71,285	0
Depreciation and amortization	30,707	28,800	21,057
Total operating expenses	665,484	610,653	546,534
Income (loss) from operations	91,305	(10,828)	(258,463)
Interest and other, net	(15,690)	(30,205)	(31,893)
Gain on long-term investments, net	1,350	2,683	17,476
Income (loss) before income taxes	76,965	(38,350)	(272,880)
Provision for (benefit from) income taxes	9,662	(30,048)	6,590
Net income (loss)	$ 67,303	$ (8,302)	$ (279,470)
Earnings (loss) per share:
Basic earnings (loss) per share (in dollars per share)	$ 0.73	$ (0.10)	$ (3.48)
Diluted earnings (loss) per share (in dollars per share)	$ 0.72	$ (0.10)	$ (3.48)