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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Goodwill [Line Items] |  |  |  |
Accumulated goodwill impairment loss |  | $ 178,732 | $ 88,324 |
Goodwill write-down |  | 90,408 | 77,572 | $ 0
Amortization expense on intangible assets |  | 71,514 | 45,756 | $ 31,562
Future amortization expense [Abstract] |  |  |  |
Future amortization expense 2021 |  | 60,448 |  |
Future amortization expense 2022 |  | 47,046 |  |
Future amortization expense 2023 |  | 28,165 |  |
Future amortization expense 2024 |  | 26,458 |  |
Future amortization expense 2025 |  | 24,472 |  |
SGK Brand Solutions |  |  |  |
Goodwill [Line Items] |  |  |  |
Accumulated goodwill impairment loss |  | 173,732 | 83,324 |
Goodwill write-down | $ 90,408 |  | 77,572 |
Memorialization |  |  |  |
Goodwill [Line Items] |  |  |  |
Accumulated goodwill impairment loss |  | 5,000 | 5,000 |
Goodwill write-down |  | $ 0 | $ 0 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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