Revenue, Product and Geographic Information Revenue by Point-in-time vs Over-time (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 85,917	$ 70,967	$ 196,541	$ 143,651
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	79,898	65,494	183,954	132,820
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 6,019	$ 5,473	$ 12,587	$ 10,831

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration