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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges | $ 261,186 |  | $ 261,186 |  | $ 261,186
Percentage of fair value in excess of carrying amount |  |  |  |  | 7.00%
Amortization expense on intangible assets | 8,959 | $ 10,517 | 18,754 | $ 20,859 |
Future amortization expense [Abstract] |  |  |  |  |
Future amortization expense for the remainder 2023 | 17,736 |  | 17,736 |  |
Future amortization expense 2024 | 20,614 |  | 20,614 |  |
Future amortization expense 2025 | 14,293 |  | 14,293 |  |
Future amortization expense 2026 | 13,200 |  | 13,200 |  |
Future amortization expense 2027 | 11,135 |  | 11,135 |  |
Memorialization |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges | 5,000 |  | 5,000 |  | $ 5,000
Industrial Technologies |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges | 23,946 |  | 23,946 |  | 23,946
SGK Brand Solutions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges | $ 232,240 |  | $ 232,240 |  | $ 232,240

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