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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) reporting_unit | Sep. 30, 2019 USD ($)
Goodwill [Line Items] |  |  |  |  |
Accumulated goodwill impairment loss |  |  | $ 178,732 | $ 178,732 |
Number of reporting units | reporting_unit |  |  |  | 2 |
Goodwill write-down | $ 90,408 | $ 77,600 | 0 | $ 90,408 | $ 77,572
Amortization expense on intangible assets |  |  | 84,233 | 71,514 | $ 45,756
Future amortization expense [Abstract] |  |  |  |  |
Future amortization expense 2022 |  |  | 57,569 |  |
Future amortization expense 2023 |  |  | 41,064 |  |
Future amortization expense 2024 |  |  | 35,505 |  |
Future amortization expense 2025 |  |  | 19,711 |  |
Future amortization expense 2026 |  |  | $ 14,686 |  |
Graphics Imaging |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Percent of fair value exceeding carrying value |  |  | 5.00% |  |
SGK Brand Solutions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated goodwill impairment loss |  |  | $ 173,732 | 173,732 |
Goodwill write-down |  |  |  | 90,408 |
Memorialization |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated goodwill impairment loss |  |  | $ 5,000 | 5,000 |
Goodwill write-down |  |  |  | $ 0 |

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