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DISCONTINUED OPERATIONS - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Jun. 27, 2022
Jun. 27, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of business     $ 295,712 $ 0 $ 0
Discontinued Operations | Installation Services and Other Discontinued Activities          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal group, including discontinued operation, insurance claims, warranty and environmental reserves     10,049 7,074  
Revenue from disposed business     0 $ 0 $ 0
Discontinued Operations | Defense Electronics          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Pro forma depreciation and amortization   $ 7,442      
Discontinued Operations | Telephonics Corporation          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal group, including discontinued operation, post closing adjustment     8,846    
Discontinued Operations, Disposed of by Sale | Telephonics Corporation          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of business $ 330,000        
Gain on sale of business     107,517    
Gain (loss) on disposition of business, net of tax     $ 89,241