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ACQUISITIONS AND DIVESTITURES - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 01, 2018 | Feb. 01, 2018 | Nov. 28, 2017 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash payment to acquire business |  |  |  |  |  | $ 1,000 | $ 11,504 | $ 121,065
Percentage of voting rights sold |  |  |  |  |  |  | 51.00% |
Proceeds from sale of ownership interests in subsidiaries |  |  |  |  | $ 42,210 |  | $ 8,254 | 0
(Gain) loss on sale of ownership interest in subsidiary |  |  |  |  | $ 11,208 |  | (6,469) | 0
Income (loss) attributable to noncontrolling interest |  |  |  |  |  | $ (497) | (901) | (260)
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] |  |  |  |  |  |  |  |
Cash payment to acquire business |  |  |  | $ 1,000 |  |  | 3,094 |
Star Granite Bronze International, Inc |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash payment to acquire business |  | $ 30,961 |  |  |  |  |  |
Total purchase price of Star Granite and Bronze International, Inc. |  | 35,961 |  |  |  |  |  |
Shares issued in business acquisition |  | 5,000 |  |  |  |  |  |
Annual sales of business before acquisition |  | $ 31,000 |  |  |  |  |  |
Compass Engineering Group, Inc |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash payment to acquire business |  |  | $ 51,887 |  |  |  |  |
Annual sales of business before acquisition |  |  | $ 24,000 |  |  |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash payment to acquire business |  |  |  |  |  |  |  | $ 39,465
Memorialization Business |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
(Gain) loss on sale of ownership interest in subsidiary |  |  |  |  |  |  | (5,587) |
Income (loss) attributable to noncontrolling interest |  |  |  |  |  |  | $ (882) |

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