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ACQUISITIONS AND DIVESTITURES - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2018 | Apr. 30, 2021 | Jan. 31, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash payment to acquire business |  |  |  |  | $ 15,623 | $ 1,000 | $ 11,504
Percentage of voting rights sold |  |  |  |  |  |  | 51.00%
Proceeds from sale of ownership interests in subsidiaries |  |  |  | $ 0 |  | 42,210 | $ 8,254
(Gain) loss on sale of ownership interest in subsidiary |  |  |  | $ 0 |  | 11,208 | (6,469)
Net income (loss) attributable to noncontrolling interest |  |  |  |  | $ (52) | (497) | (901)
SGK Brand Solutions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash payment to acquire business |  | $ 2,523 |  |  |  |  |
Memorialization Business |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash payment to acquire business |  |  | $ 13,100 |  |  | $ 1,000 | 3,094
Frost Converting Systems |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash payment to acquire business | $ 7,162 |  |  |  |  |  |
Percentage of voting interests acquired | 80.00% |  |  |  |  |  |
Memorialization Business |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
(Gain) loss on sale of ownership interest in subsidiary |  |  |  |  |  |  | (5,587)
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  | $ (882)

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