CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net revenues	$ 483,069	$ 210,300	$ 704,378	$ 414,226
Cost of revenues	330,440	102,668	441,906	203,311
Gross profit	152,629	107,632	262,472	210,915
Operating expenses:
Research, development, and engineering	57,047	19,932	80,748	41,145
Selling, general, and administrative	174,297	57,696	238,500	113,929
Gain, net from litigation settlements	0	(104)	(30)	(280)
Restructuring and other related charges (credits)	7,261	(51)	8,581	2,522
Total operating expenses	238,605	77,473	327,799	157,316
Operating income (loss)	(85,976)	30,159	(65,327)	53,599
Interest expense	(23,893)	(7,260)	(31,220)	(14,563)
Other non-operating income, net	1,610	1,826	3,606	2,740
Income (Loss) before income taxes	(108,259)	24,725	(92,941)	41,776
Income tax expense (benefit)	(21,550)	4,772	(20,703)	2,995
Net income (loss)	$ (86,709)	$ 19,953	$ (72,238)	$ 38,781
Earnings (Loss) per common share:
Earnings (Loss) per common share:	$ (2.21)	$ 0.59	$ (2.01)	$ 1.16
Diluted (in dollars per share)	$ (2.21)	$ 0.59	$ (2.01)	$ 1.14
Shares used in computing earnings (loss) per common share:
Basic (in shares)	39,281	32,570	35,938	32,538
Diluted (in shares)	39,281	32,809	35,938	33,111
Cash dividends declared per common share (in dollars per share)	$ 0.15	$ 0.15	$ 0.3	$ 0.3
Product [Member]
Net revenues	$ 435,262	$ 210,300	$ 656,571	$ 414,226
Cost of revenues	305,477	102,668	416,943	203,311
Service [Member]
Net revenues	47,807	0	47,807	0
Cost of revenues	$ 24,963	$ 0	$ 24,963	$ 0