CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net revenue	$ 480,840	$ 476,473	$ 1,342,618	$ 1,208,192
Cost of goods sold	267,983	311,074	709,100	708,059
Gross profit	212,857	165,399	633,518	500,133
Selling and marketing	79,513	95,820	208,641	247,141
General and administrative	65,951	52,939	187,378	149,367
Research and development	49,977	37,589	142,245	101,494
Depreciation and amortization	7,864	7,460	34,490	22,329
Business reorganization	700	0	13,012	0
Total operating expenses	204,005	193,808	585,766	520,331
Income (loss) from operations	8,852	(28,409)	47,752	(20,198)
Interest and other, net	3,374	(3,715)	(2,403)	(15,298)
Gain on long-term investments, net	0	0	0	1,350
Income (loss) before income taxes	12,226	(32,124)	45,349	(34,146)
Benefit from income taxes	(12,914)	(2,282)	(37,331)	(2,169)
Net income (loss)	$ 25,140	$ (29,842)	$ 82,680	$ (31,977)
Earnings (loss) per share:
Basic earnings (loss) per share (in dollars per share)	$ 0.22	$ (0.33)	$ 0.76	$ (0.37)
Diluted earnings (loss) per share (in dollars per share)	$ 0.21	$ (0.33)	$ 0.74	$ (0.37)