CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Net revenues	$ 501,669	$ 226,534	$ 1,206,047	$ 640,760
Cost of revenues	286,532	112,409	728,438	315,720
Gross profit	215,137	114,125	477,609	325,040
Operating expenses:
Research, development, and engineering	59,661	21,257	140,409	62,402
Selling, general, and administrative	168,053	56,196	406,553	170,125
Gain, net from litigation settlements	0	(15)	(30)	(295)
Restructuring and other related charges (credits)	12,130	(84)	20,711	2,438
Total operating expenses	239,844	77,354	567,643	234,670
Operating income (loss)	(24,707)	36,771	(90,034)	90,370
Interest expense	(25,032)	(7,341)	(56,252)	(21,904)
Other non-operating income, net	125	2,490	3,731	5,230
Income (Loss) before income taxes	(49,614)	31,920	(142,555)	73,696
Income tax expense (benefit)	(7,880)	81,424	(28,583)	84,419
Net loss	$ (41,734)	$ (49,504)	$ (113,971)	$ (10,723)
Loss per common share:
Basic (in dollars per share)	$ (1.06)	$ (1.54)	$ (3.08)	$ (0.33)
Diluted (in dollars per share)	$ (1.06)	$ (1.54)	$ (3.08)	$ (0.33)
Shares used in computing loss per common share:
Basic (in shares)	39,314	32,075	37,063	32,384
Diluted (in shares)	39,314	32,075	37,063	32,384
Product [Member]
Net revenues	$ 445,441	$ 226,534	$ 1,102,012	$ 640,760
Cost of revenues	259,673	112,409	676,616	315,720
Service [Member]
Net revenues	56,228	0	104,035	0
Cost of revenues	$ 26,859	$ 0	$ 51,822	$ 0