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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges | $ 45,673 | $ 277,913 | $ 45,673 | $ 277,913 |
Goodwill write-downs | 0 |  | 0 | 16,727 | $ 0
Amortization expense on intangible assets |  |  | 20,069 | 37,023 | $ 42,068
Future amortization expense 2026 | 9,497 |  | 9,497 |  |
Future amortization expense 2027 | 8,597 |  | 8,597 |  |
Future amortization expense 2028 | 6,702 |  | 6,702 |  |
Future amortization expense 2029 | 5,782 |  | 5,782 |  |
Future amortization expense 2030 | 5,314 |  | 5,314 |  |
Surfaces and Engineering Reporting Unit |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill write-downs |  | 16,727 |  |  |
Memorialization |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges | 5,000 | 5,000 | 5,000 | 5,000 |
Goodwill write-downs |  |  |  | 0 |
Industrial Technologies |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges | $ 40,673 | 40,673 | $ 40,673 | 40,673 |
Goodwill write-downs |  |  |  | 16,727 |
SGK Brand Solutions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges |  | $ 232,240 |  | 232,240 |
Goodwill write-downs |  |  |  | $ 0 |

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