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Summary of Significant Accounting Principles and Practices - Narrative (Details) |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 13, 2021 USD ($) | Oct. 04, 2019 USD ($) | Jul. 12, 2019 USD ($) | Jul. 01, 2019 USD ($) | Feb. 13, 2019 USD ($) | Dec. 31, 2020 reporting_unit | Mar. 28, 2020 reporting_unit | Mar. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) reporting_unit segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 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 | $ 28,907,000 | $ 0
COVID-19 related government assistance amount |  |  |  |  |  |  |  |  | 2,700,000 |  |
Research and development, design and related engineering |  |  |  |  |  |  |  |  | $ 86,800,000 | 108,900,000 | 114,300,000
Cash and cash equivalents maturity period (in months) |  |  |  |  |  |  |  |  | 3 months |  |
Depreciation expense |  |  |  |  |  |  |  |  | $ 13,300,000 | 13,700,000 | 15,000,000.0
Impairment charge to right-of-use |  |  |  |  |  |  |  |  | $ 691,000 | 1,019,000 |
Long-lived asset impairment charge |  |  |  |  |  |  |  |  |  | 9,500,000 |
Number of reporting units | reporting_unit |  |  |  |  |  |  | 8 |  |  |  |
Number of reporting units impaired | reporting_unit |  |  |  |  |  |  |  |  | 4 |  |
Impairment charge |  |  |  |  |  |  |  |  | $ 86,312,000 | 1,610,000 | 0
Number of reporting units have goodwill and subject to goodwill impairment test | reporting_unit |  |  |  |  |  | 5 |  |  | 5 |  |
Intangible asset impairment charge |  |  |  |  |  |  |  |  | $ 0 |  | 0
Equity investment impairment |  |  |  |  |  |  |  |  | 3,493,000 | 5,000,000 | 0
Cumulative pretax loss position period |  |  |  |  |  | 3 years |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  | 0 | 0 | $ 0
Cost of Products Sold |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
COVID-19 related government assistance amount |  |  |  |  |  |  |  |  | 2,400,000 |  |
Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
COVID-19 related government assistance amount |  |  |  |  |  |  |  |  | $ 300,000 |  |
Astronics AeroSat Corporation |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  | 1,600,000 |
Disposed of by Sale | Airfield Lighting Product Line |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |
Percentage of revenue (as a percentage) |  |  | 1.00% |  |  |  |  |  | 1.00% |  |
Pre-tax loss on sale |  |  | $ 1,300,000 |  |  |  |  |  | $ 1,300,000 |  |
Test Systems |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  | 0 | 0 |
Test Systems | Held for Sale |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total cash proceeds of divesture |  |  |  |  | $ 103,800,000 |  |  |  |  |  |
Gain on sale, net of tax |  |  |  |  | 80,100,000 |  |  | $ 80,100,000 |  |  |
Income taxes from divesture |  |  |  |  | $ 19,700,000 |  |  | $ 19,700,000 |  |  |
Test Systems | Held for Sale | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent earn-outs | $ 10,700,000 |  |  |  |  |  |  |  |  |  |
Aerospace |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  | $ 86,312,000 | 1,610,000 |
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 |  | $ 7,000,000.0 |  |  |  |  |  |  |  |  |
Contingent consideration, fair value |  | 2,500,000 |  |  |  |  |  |  |  |  |
Potential additional earn-out |  | $ 13,000,000.0 |  |  |  |  |  |  |  |  |
Achievement period (in years) |  | 3 years |  |  |  |  |  |  |  |  |
Earn-out achievement benchmark |  | $ 72,000,000.0 |  |  |  |  |  |  |  |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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