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Revenues - Disaggregation of Revenue by Market Sector (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 28, 2020 | Mar. 30, 2019
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 67,696 | $ 76,525
Test & Measurement |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 14,345 | 17,621
Avionics, Military & Space |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 6,160 | 8,115
Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 8,244 | 9,619
Other Markets |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 13,128 | 12,924
Industrial Weighing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 12,467 | 14,437
General Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 4,039 | 5,622
Steel |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 9,313 | $ 8,187

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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