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IMPAIRMENTS, RESTRUCTURING AND OTHER CHARGES - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 03, 2021 | Mar. 28, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Goodwill impairment loss | $ 0 |  |  | $ 0 | $ 86,312,000 | $ 1,600,000
Impairment of long-lived assets held-for-use |  |  | $ 9,500,000 |  |  |
Restructuring charges |  |  |  | 798,000 | 5,327,000 | 5,190,000
Impairment Charge of Operating Lease ROU Asset |  |  |  | 0 | 691,000 |
Severance costs |  |  |  | 600,000 | 2,600,000 | 2,800,000
Equity investment impairment |  |  |  | 0 | 3,493,000 | 5,000,000
Aerospace |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Goodwill impairment loss |  | $ 86,300,000 |  |  | 86,312,000 |
Impairment of long-lived assets held-for-use |  |  |  |  |  | $ 2,300,000
Restructuring, settlement and impairment provisions |  |  | 23,600,000 | 200,000 | 400,000 |
Restructuring charges |  |  | $ 5,200,000 |  |  |
Severance costs |  |  |  | 300,000 | 4,900,000 |
Test Systems |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  | $ 0 |
Severance costs |  |  |  | $ 300,000 |  |

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