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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, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |  |
Adjusted EBITDA |  |  | $ 227,750 | $ 203,080 | $ 220,872
Non-Operating Income and Expenses [Abstract] |  |  |  |  |
Acquisition related items |  |  | (541) | (3,440) | (10,084)
ERP integration costs |  |  | (1,037) | (2,296) | (7,508)
Workforce reductions and related costs |  |  | (10,644) | (9,232) | (5,061)
Other cost-reduction initiatives |  |  | (17,317) | (25,718) | (9,176)
Legal matter reserve |  |  | 0 | (10,566) | 0
Non-recurring / incremental COVID-19 costs |  |  | (5,312) | (3,908) | 0
Goodwill write-downs | $ (90,408) | $ (77,600) | 0 | (90,408) | (77,572)
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |  |
Gain (loss) on sale of ownership interests in a subsidiaries |  |  | 0 | 11,208 | (6,469)
Realized loss on cost-method investments |  |  | 0 | 0 | (4,731)
Net gains from the sale of buildings and vacant properties |  |  | 0 | 0 | 7,347
Joint Venture depreciation, amortization, interest expense and other charges |  |  | 0 | (4,732) | (1,514)
Stock-based compensation |  |  | (15,581) | (8,096) | (7,729)
Non-service pension and postretirement expense |  |  | (5,837) | (7,789) | (3,802)
Depreciation and amortization |  |  | (133,512) | (119,058) | (90,793)
Interest expense |  |  | (28,684) | (34,885) | (40,962)
Net loss attributable to noncontrolling interests |  |  | (52) | (497) | (901)
Income (loss) before income taxes |  |  | 9,233 | (106,337) | (38,083)
Income tax (provision) benefit |  |  | (6,375) | 18,685 | (806)
Net income (loss) |  |  | 2,858 | (87,652) | (38,889)
SGK Brand Solutions |  |  |  |  |
Non-Operating Income and Expenses [Abstract] |  |  |  |  |
Goodwill write-downs |  |  |  | (90,408) |
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |  |
Acquisition costs, ERP integration costs, and strategic initiatives and other charges |  |  | 16,349 | 14,737 | 8,903
Memorialization |  |  |  |  |
Non-Operating Income and Expenses [Abstract] |  |  |  |  |
Goodwill write-downs |  |  |  | 0 |
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |  |
Acquisition costs, ERP integration costs, and strategic initiatives and other charges |  |  |  | 1,923 | 2,696
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
Operating Segments | SGK Brand Solutions |  |  |  |  |
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |  |
Adjusted EBITDA |  |  | 99,665 | 90,644 | 119,493
Non-Operating Income and Expenses [Abstract] |  |  |  |  |
Non-recurring / incremental COVID-19 costs |  |  | (1,563) | (1,453) |
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |  |
Depreciation and amortization |  |  | (99,490) | (87,597) | (59,684)
Net gains (losses) from the sale of buildings and vacant properties |  |  | (915) |  |
Operating Segments | Memorialization |  |  |  |  |
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |  |
Adjusted EBITDA |  |  | 165,653 | 146,285 | 134,286
Non-Operating Income and Expenses [Abstract] |  |  |  |  |
Non-recurring / incremental COVID-19 costs |  |  | (3,646) | (1,819) |
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |  |
Depreciation and amortization |  |  | (23,043) | (20,527) | (19,731)
Net gains (losses) from the sale of buildings and vacant properties |  |  | (401) |  |
Operating Segments | Industrial Technologies |  |  |  |  |
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |  |
Adjusted EBITDA |  |  | 26,659 | 22,753 | 24,082
Non-Operating Income and Expenses [Abstract] |  |  |  |  |
Non-recurring / incremental COVID-19 costs |  |  | (14) | (21) |
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |  |
Depreciation and amortization |  |  | (5,602) | (5,771) | (6,195)
Net gains (losses) from the sale of buildings and vacant properties |  |  | 8,663 |  |
Corporate, Non-Segment |  |  |  |  |
Reconciliation Of Adjusted EBITDA To Net Income [Abstract] |  |  |  |  |
Adjusted EBITDA |  |  | (64,227) | (56,602) | (56,989)
Non-Operating Income and Expenses [Abstract] |  |  |  |  |
Non-recurring / incremental COVID-19 costs |  |  | (89) | (615) |
Net realized gains (losses) on divestitures and asset dispositions: |  |  |  |  |
Depreciation and amortization |  |  | (5,377) | (5,163) | (5,183)
Acquisition costs, ERP integration costs, and strategic initiatives and other charges |  |  | $ 11,267 | $ 22,985 | $ 19,853

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