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SEGMENTS - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 03, 2021 | Mar. 28, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information |  |  |  |  |
Goodwill impairment loss | $ 0 |  | $ 0 | $ 86,312,000 | $ 1,600,000
Goodwill |  |  | 58,282,000 | 58,282,000 | 144,970,000
Aerospace |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Goodwill impairment loss |  | $ 86,300,000 |  | 86,312,000 |
Intangible asset impairment charge |  |  |  |  | 6,200,000
Goodwill |  |  | 36,648,000 | 36,648,000 | 123,038,000
Test Systems |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Goodwill impairment loss |  |  |  | 0 |
Goodwill |  |  | $ 21,634,000 | $ 21,634,000 | $ 21,932,000

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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