CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Net revenues	$ 1,674,535	$ 856,903	$ 881,176
Cost of revenues	980,396	417,788	439,806
Gross profit	694,139	439,115	441,370
Operating expenses:
Research, development, and engineering	201,886	84,193	88,318
Selling, general, and administrative	567,879	229,390	223,830
(Gain) loss, net from litigation settlements	975	(420)	4,255
Restructuring and other related charges (credits)	32,694	2,451	(109)
Total operating expenses	803,434	315,614	316,294
Operating income (loss)	(109,295)	123,501	125,076
Interest expense	(83,000)	(29,297)	(29,230)
Other non-operating income and (expense), net	6,603	6,023	5,819
Income (loss) before income taxes	(185,692)	100,227	101,665
Income tax expense (benefit)	(50,131)	101,096	19,066
Net income (loss)	$ (135,561)	$ (869)	$ 82,599
Earnings (loss) per common share:
Basic (in dollars per share)	$ (3.61)	$ (0.03)	$ 2.56
Diluted (in dollars per share)	$ (3.61)	$ (0.03)	$ 2.51
Shares used in computing earnings (loss) per common share:
Basic (in shares)	37,569	32,345	32,279
Diluted (in shares)	37,569	32,345	32,963
Cash dividends declared per common share (in dollars per share)	$ 0.6	$ 0.6	$ 0.6
Product [Member]
Net revenues	$ 1,510,770
Cost of revenues	902,625
Service [Member]
Net revenues	163,765	$ 0	$ 0
Cost of revenues	$ 77,771	$ 0	$ 0