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IMPAIRMENTS, RESTRUCTURING AND OTHER CHARGES - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 03, 2021 | Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Goodwill impairment loss | $ 0 | $ 0 | $ 0 | $ 0 | $ 86,300,000
Severance costs |  |  |  | 600,000 | 2,600,000
Equity investment impairment |  |  | 0 | 0 | 3,493,000
Aerospace |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Goodwill impairment loss |  |  |  |  | 86,300,000
Restructuring, settlement and impairment provisions |  |  |  | 200,000 | 400,000
Impairment charge to right-of-use assets |  |  |  |  | 700,000
Severance costs |  |  |  | $ 300,000 | $ 4,900,000
Test Systems |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Severance costs |  |  | $ 300,000 |  |

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- Definition Amount of impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
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