Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Product and Geographic Information - Net Sales & Gross Profit by Product Category (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Mar. 31, 2018	Apr. 01, 2017	Apr. 02, 2016
Product Category Reporting Information [Line Items]
Gross Profit	$ 54,722	$ 53,156	$ 26,532	$ 26,420	$ 18,230	$ 11,448	$ 10,980	$ 20,808	$ 160,830	$ 61,466	$ 72,703
Revenue, Net	$ 113,393	$ 110,840	$ 70,967	$ 72,684	$ 49,918	$ 33,779	$ 29,658	$ 47,668	367,884	161,023	184,391
Printed Circuit Board [Member]
Product Category Reporting Information [Line Items]
Revenue, Net									256,430	88,771	94,121
Component Test [Member]
Product Category Reporting Information [Line Items]
Revenue, Net									32,790	22,381	19,901
Semiconductor [Member]
Product Category Reporting Information [Line Items]
Revenue, Net									55,171	29,557	38,262
Industrial Machining [Member]
Product Category Reporting Information [Line Items]
Revenue, Net									$ 23,493	$ 20,314	$ 32,107