Revenue, Product and Geographic Information Revenue from Product Market (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Revenue from External Customer [Line Items]
Revenue, Net	$ 110,624	$ 72,684
Service-based [Member] [Domain]
Revenue from External Customer [Line Items]
Revenue, Net	13,767	10,591
Printed Circuit Board [Member]
Revenue from External Customer [Line Items]
Revenue, Net	66,337	46,185
Component Test [Member] [Member]
Revenue from External Customer [Line Items]
Revenue, Net	9,405	7,448
Semiconductor [Member]
Revenue from External Customer [Line Items]
Revenue, Net	18,777	5,181
Industrial Machining [Member]
Revenue from External Customer [Line Items]
Revenue, Net	$ 2,338	$ 3,279