Segment and Geographic Information Net Sales by Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 29,658	$ 46,472	$ 77,326	$ 89,563
Component Processing [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	25,739	32,754	68,868	71,038
Micromachining [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 3,919	$ 13,718	$ 8,458	$ 18,525