Product and Geographic Information Revenue from Product Market (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Revenue from External Customer [Line Items]
Revenue, Net	$ 70,967	$ 29,658	$ 143,651	$ 77,326
Printed Circuit Board [Member]
Revenue from External Customer [Line Items]
Revenue, Net	43,541	13,527	95,859	44,445
Component Test [Member] [Member]
Revenue from External Customer [Line Items]
Revenue, Net	7,677	4,990	15,858	9,592
Semiconductor [Member]
Revenue from External Customer [Line Items]
Revenue, Net	12,028	7,222	18,765	14,831
Industrial Machining [Member]
Revenue from External Customer [Line Items]
Revenue, Net	$ 7,721	$ 3,919
Industrial Machining [Member]
Revenue from External Customer [Line Items]
Revenue, Net			$ 13,169	$ 8,458