Revenue, Product and Geographic Information Revenue by Point-in-time vs Over-time (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 67,942	$ 110,840	$ 264,483	$ 254,491
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	62,607	104,202	246,561	237,022
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 5,335	$ 6,638	$ 17,922	$ 17,469

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