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BUSINESS SEGMENTS - Segment EBITDA (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]        
Segment adjusted EBITDA $ 43,786 $ 39,351 $ 87,442 $ 79,266
Net interest expense (16,044) (12,705) (32,686) (25,994)
Segment depreciation and amortization 13,313 12,147 26,271 24,135
Unallocated amounts 10,541 10,455 20,977 20,766
Acquisition costs 814 0 3,999 0
Income before taxes from continuing operations     13,715  
Income (loss) before taxes from continuing operations 3,188 4,169 1,115 8,600
Home And Building Products [Member]        
Segment Reporting Information [Line Items]        
Segment adjusted EBITDA 39,789 27,565 79,246 59,372
Segment depreciation and amortization 10,504 9,251 20,637 18,418
Telephonics [Member]        
Segment Reporting Information [Line Items]        
Segment adjusted EBITDA 3,997 11,786 8,196 19,894
Segment depreciation and amortization 2,695 2,771 5,414 5,488
Continuing Operations [Member] | Postretirement Life Insurance [Member]        
Segment Reporting Information [Line Items]        
Net interest expense (16,044) (12,705) (32,686) (25,994)
Unallocated amounts 10,541 10,455 20,977 20,766
Income before taxes from continuing operations 0 0 (2,614) 0
Income (loss) before taxes from continuing operations $ 3,188 $ 4,169 $ 1,115 $ 8,600