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SUMMARY OF SIGNIFICANT ACCOUNTING PRINCIPLES AND PRACTICES - Narrative (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2022 USD ($) | Oct. 03, 2021 USD ($) | Feb. 13, 2021 USD ($) | Oct. 04, 2019 USD ($) | Jul. 12, 2019 USD ($) | Jul. 01, 2019 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 28, 2020 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  | 2 |  |
Business acquisition purchase price paid in cash |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 28,907,000
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  | (5,530,000) | 37,335,000 | 42,689,000
Net Gain on Sale of Businesses |  |  |  |  |  |  |  | $ 10,677,000 | $ 0 |  | 10,677,000 | 0 | 78,801,000
Impairment charge |  | $ 0 |  |  |  |  |  |  |  |  | 0 | 86,312,000 | 1,600,000
Research and development, design and related engineering |  |  |  |  |  |  |  |  |  |  | $ 85,300,000 | 86,800,000 | 108,900,000
Cash and cash equivalents maturity period (in months) |  |  |  |  |  |  |  |  |  |  | 3 months |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  | $ 12,700,000 | 13,300,000 | 13,700,000
Impairment charge to right-of-use |  |  |  |  |  |  |  |  |  |  | 0 | 691,000 |
Long-lived asset impairment charge |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000
Equity investment impairment |  |  |  |  |  |  |  |  |  |  | $ 0 | 3,493,000 | 5,000,000
Cumulative pretax loss position period |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Cash dividends paid |  |  |  |  |  |  |  |  |  |  | $ 0 | 0 | 0
United States Department Of Transportation | Grant |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
USDOT grant receivable amount |  |  |  |  |  |  | $ 14,700,000 | 7,300,000 |  |  | 7,300,000 |  |
Second installment to be received |  |  |  |  |  |  |  | 5,200,000 |  |  | 5,200,000 |  |
Portion of grant received |  |  |  |  |  |  | $ 7,400,000 |  |  |  |  |  |
Revenue recognized included in contract liability balance |  |  |  |  |  |  |  |  |  |  | 8,700,000 |  |
Unearned portion of the AMPJ award |  |  |  |  |  |  |  | 6,000,000 |  |  | 6,000,000 |  |
Federal |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease) |  |  |  |  |  |  |  |  | 14,100,000 |  | 6,000,000 | 23,300,000 |
Foreign Tax Authority |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease) |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |
Disposed of by Sale | Airfield Lighting Product Line |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
Percentage of revenue (as a percentage) |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Pre-tax loss on sale |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |
Test Systems |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  | 0 |
Test Systems | Held for Sale |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earn-outs |  |  | $ 10,700,000 |  |  |  |  |  |  |  |  |  |
Test Systems | Held for Sale | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earn-outs | $ 11,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Aerospace |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  | $ 86,300,000 |  | 86,312,000 |
Intangible asset impairment charge |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,200,000
Building | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  |  |  |  |  |  |  |  |  |  | 25 years |  |
Building | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  |  |  |  |  |  |  |  |  |  | 40 years |  |
Machinery and Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  |  |  |  |  |  |  |  |  |  | 4 years |  |
Machinery and Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Freedom Communication Technologies, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition purchase price paid in cash |  |  |  |  |  | $ 21,800,000 |  |  |  |  |  |  |
Cash acquired |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |
Diagnosys Test Systems Limited |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |
Financial liabilities carried at fair value |  |  |  | $ 2,500,000 |  |  |  | $ 0 | $ 2,200,000 |  | $ 0 | $ 2,200,000 |

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