CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Net revenues	$ 410,969	$ 461,709	$ 766,689	$ 909,476
Cost of revenues	230,223	255,638	429,611	490,759
Gross profit	180,746	206,071	337,078	418,717
Operating expenses:
Research, development, and engineering	52,148	57,415	102,177	116,939
Selling, general, and administrative	115,605	148,419	232,250	312,027
(Gain) loss, net from litigation settlements	0	0	17,561	(1,162)
Restructuring and other related charges	6,170	5,847	35,500	25,372
Total operating expenses	173,923	211,681	387,488	453,176
Operating income (loss)	6,823	(5,610)	(50,410)	(34,459)
Interest expense	(18,581)	(23,797)	(39,765)	(47,729)
Other non-operating income (loss), net	1,366	(625)	1,592	(292)
Loss before income taxes	(10,392)	(30,032)	(88,583)	(82,480)
Income tax expense (benefit)	3,013	(4,122)	(163)	(11,699)
Net loss	$ (13,405)	$ (25,910)	$ (88,420)	$ (70,781)
Loss per common share:
Basic (in dollars per share)	$ (0.33)	$ (0.65)	$ (2.17)	$ (1.80)
Diluted (in dollars per share)	$ (0.33)	$ (0.65)	$ (2.17)	$ (1.80)
Shares used in computing loss per common share:
Basic (in shares)	40,970	39,584	40,715	39,411
Diluted (in shares)	40,970	39,584	40,715	39,411
Product
Net revenues	$ 347,677	$ 395,137	$ 639,135	$ 777,882
Cost of revenues	209,261	229,323	385,876	437,939
Service
Net revenues	63,292	66,572	127,554	131,594
Cost of revenues	$ 20,962	$ 26,315	$ 43,735	$ 52,820