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SEGMENT INFORMATION - Reconciliation of Adjusted EBITDA to Net Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |
Adjusted EBITDA |  | $ 203,080 | $ 220,872 | $ 255,114
Non-Operating Income and Expenses [Abstract] |  |  |  |
Acquisition costs |  | (3,844) | (10,872) | (10,918)
ERP integration costs |  | (2,296) | (7,508) | (10,864)
Strategic initiatives and other charges |  | (33,799) | (13,449) | (5,266)
Legal matter reserve |  | (10,566) | 0 | 0
Non-recurring / incremental COVID-19 costs |  | (4,655) | 0 | 0
Goodwill write-downs |  | (90,408) | (77,572) | 0
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |
Gain (loss) on sale of ownership interests in a subsidiary |  | 11,208 | (6,469) | 0
Realized (loss) gain on cost-method investments |  | 0 | (4,731) | 3,771
Net gains from the sale of buildings and vacant properties |  | 0 | 7,347 | 0
Joint Venture depreciation, amortization, interest expense and other charges |  | (4,732) | (1,514) | 0
Stock-based compensation |  | (8,096) | (7,729) | (13,460)
Non-service pension and postretirement expense |  | (7,789) | (3,802) | (5,723)
Depreciation and amortization |  | (119,058) | (90,793) | (76,974)
Interest expense |  | (34,885) | (40,962) | (37,427)
Net loss attributable to noncontrolling interests |  | (497) | (901) | (260)
(Loss) income before income taxes |  | (106,337) | (38,083) | 97,993
Income tax benefit (provision) |  | 18,685 | (806) | 9,118
Net (loss) income |  | (87,652) | (38,889) | 107,111
SGK Brand Solutions |  |  |  |
Non-Operating Income and Expenses [Abstract] |  |  |  |
Goodwill write-downs | $ (90,408) |  | (77,572) |
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |
Acquisition costs, ERP integration costs, and strategic initiatives and other charges |  | 13,990 | 8,903 | 11,044
Memorialization |  |  |  |
Non-Operating Income and Expenses [Abstract] |  |  |  |
Goodwill write-downs |  | 0 | 0 |
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |
Acquisition costs, ERP integration costs, and strategic initiatives and other charges |  |  | 2,696 | 1,430
Industrial Technologies |  |  |  |
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |
Acquisition costs, ERP integration costs, and strategic initiatives and other charges |  | 268 | 3,073 | 613
Operating Segments | SGK Brand Solutions |  |  |  |
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |
Adjusted EBITDA |  | 90,644 | 119,493 | 150,233
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |
Net gains from the sale of buildings and vacant properties |  | (915) |  |
Depreciation and amortization |  | (87,597) | (59,684) | (46,300)
Operating Segments | Memorialization |  |  |  |
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |
Adjusted EBITDA |  | 146,285 | 134,286 | 145,487
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |
Net gains from the sale of buildings and vacant properties |  | (401) |  |
Depreciation and amortization |  | (20,527) | (19,731) | (20,005)
Operating Segments | Industrial Technologies |  |  |  |
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |
Adjusted EBITDA |  | 22,753 | 24,082 | 25,864
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |
Net gains from the sale of buildings and vacant properties |  | 8,663 |  |
Depreciation and amortization |  | (5,771) | (6,195) | (5,796)
Corporate, Non-Segment |  |  |  |
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |
Adjusted EBITDA |  | (56,602) | (56,989) | (66,470)
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |
Depreciation and amortization |  | (5,163) | (5,183) | (4,873)
Acquisition costs, ERP integration costs, and strategic initiatives and other charges |  | $ 22,985 | $ 19,853 | $ 13,961

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