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DISCONTINUED OPERATIONS - Narrative (Details) $ in Thousands | 12 Months Ended | 24 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) position | Sep. 30, 2019 USD ($) | Sep. 30, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue from disposed business | $ 271,060 | $ 340,976 | $ 335,041 |
Discontinued Operations | Installation Services and Other Discontinued Activities |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue from disposed business | 0 | 0 | 0 |
Discontinued operation, claims dispute settlement |  |  | 11,050 |
Discontinued operation, claims dispute settlement, net of tax |  |  | 8,335 |
Total Liabilities Held for Sale | 7,074 | $ 10,811 |  | $ 7,074
Discontinued Operations | Defense Electronics | Voluntary Employee Retirement Plan and Reduction In Force |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of headcount reduced | position |  | 90 |  |
Discontinued Operations | Defense Electronics | Voluntary Employee Retirement Plan |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Restructuring charges | 2,200 | $ 2,100 |  | $ 4,300
Discontinued Operations | Defense Electronics | Exit of Older Weather Radar Product Lines |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Business exit costs | 5,601 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Systems Engineering Group, Inc. |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue from disposed business | $ 6,713 | $ 31,758 | $ 27,450 |

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