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REPORTABLE SEGMENTS - Schedule of summary of reconciliation of segment profit before taxes and operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |
Subtotal | $ 317,174 | $ 282,912 | $ 245,942
Segment Adjusted EBITDA | 296,688 | 257,684 | 210,838
Unallocated amounts, excluding depreciation | (49,054) | (48,262) | (47,231)
Adjusted EBITDA | 247,634 | 209,422 | 163,607
Net interest expense | (62,735) | (65,795) | (67,513)
Depreciation and amortization | (52,302) | (52,100) | (51,517)
Restructuring charges | (21,418) | (13,670) | 0
Loss from debt extinguishment | 0 | (7,925) | 0
Acquisition contingent consideration | 0 | 1,733 | 1,646
Acquisition costs | 0 | (2,960) | 0
Income (loss) before taxes from continuing operations | 111,179 | 68,705 | 46,223
Discontinued Operations, Held-for-sale | Defense Electronics |  |  |
Segment Reporting Information [Line Items] |  |  |
Less: Defense Electronics | 20,486 | 25,228 | 35,104
Consumer and Professional Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment Adjusted EBITDA: | 115,673 | 104,053 | 90,677
Depreciation and amortization | (34,433) | (32,788) | (32,289)
Home and Building Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment Adjusted EBITDA: | 181,015 | 153,631 | 120,161
Depreciation and amortization | $ (17,370) | $ (18,361) | $ (18,334)

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