CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net revenues	$ 461,709	$ 483,069	$ 909,476	$ 704,378
Cost of revenues	255,638	330,440	490,759	441,906
Gross profit	206,071	152,629	418,717	262,472
Operating expenses:
Research, development, and engineering	57,415	57,047	116,939	80,748
Selling, general, and administrative	148,419	174,297	312,027	238,500
Gain, net from litigation settlements	0	0	(1,162)	(30)
Restructuring and other related charges	5,847	7,261	25,372	8,581
Total operating expenses	211,681	238,605	453,176	327,799
Operating loss	(5,610)	(85,976)	(34,459)	(65,327)
Interest expense	(23,797)	(23,893)	(47,729)	(31,220)
Other non-operating income, net	(625)	1,610	(292)	3,606
Loss before income taxes	(30,032)	(108,259)	(82,480)	(92,941)
Income tax benefit	(4,122)	(21,550)	(11,699)	(20,703)
Net loss	$ (25,910)	$ (86,709)	$ (70,781)	$ (72,238)
Loss per common share:
Basic (in dollars per share)	$ (0.65)	$ (2.21)	$ (1.80)	$ (2.01)
Diluted (in dollars per share)	$ (0.65)	$ (2.21)	$ (1.80)	$ (2.01)
Shares used in computing loss per common share:
Basic (in shares)	39,584	39,281	39,411	35,938
Diluted (in shares)	39,584	39,281	39,411	35,938
Product [Member]
Net revenues	$ 395,137	$ 435,262	$ 777,882	$ 656,571
Cost of revenues	229,323	305,477	437,939	416,943
Service [Member]
Net revenues	66,572	47,807	131,594	47,807
Cost of revenues	$ 26,315	$ 24,963	$ 52,820	$ 24,963