Revenue, Product and Geographic Information Revenue from Geographic Location table (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Revenue from External Customer [Line Items]
Revenues	$ 85,917	$ 70,967	$ 196,541	$ 143,651
Asia [Member]
Revenue from External Customer [Line Items]
Revenues	76,334	64,053	175,700	130,616
Americas [Member]
Revenue from External Customer [Line Items]
Revenues	3,115	2,936	9,478	7,106
Europe [Member]
Revenue from External Customer [Line Items]
Revenues	$ 6,468	$ 3,978	$ 11,363	$ 5,929