CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017
Revenues	$ 67,942	$ 110,840	$ 264,483	$ 254,491
Cost of sales	41,804	57,684	146,080	148,383
Gross profit	26,138	53,156	118,403	106,108
Operating expenses:
Selling, service and administration	9,376	11,040	30,344	35,496
Research, development and engineering	8,609	8,165	27,821	25,373
Restructuring Costs	0	706	0	4,079
Business Combination, Integration Related Costs	4,277	0	4,277	0
Net operating expenses	22,262	19,911	62,442	64,948
Operating (loss) income	3,876	33,245	55,961	41,160
Non-operating (expense) income:
Interest and other (expense) income, net	1,985	789	2,820	376
Other Nonoperating Income (Expense)	1,985	789	2,820	376
Income (loss) before income taxes	5,861	34,034	58,781	41,536
Provision for (benefit from) income taxes	(479)	61	4,462	401
Net (loss) income	$ 6,340	$ 33,973	$ 54,319	$ 41,135
Net (loss) income per share - basic	$ 0.18	$ 0.99	$ 1.57	$ 1.22
Net (loss) income per share - diluted	$ 0.18	$ 0.94	$ 1.50	$ 1.16
Weighted average number of shares - basic	34,769	34,224	34,623	33,839
Weighted Average Number of Shares Outstanding, Diluted	35,975	36,010	36,127	35,562
Product [Member]
Revenues	$ 55,679	$ 99,418	$ 223,799	$ 221,827
Cost of sales	34,744	52,502	125,377	132,107
Service Market [Member]
Revenues	12,263	11,422	40,684	32,664
Cost of sales	$ 7,060	$ 5,182	$ 20,703	$ 16,276