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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ in Thousands, € in Millions |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |
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Nov. 01, 2018 USD ($) | Feb. 01, 2018 USD ($) | Nov. 28, 2017 USD ($) | Mar. 01, 2017 USD ($) | Mar. 01, 2017 EUR (€) | Feb. 28, 2017 USD ($) | Jan. 13, 2017 USD ($) | Jan. 13, 2017 EUR (€) | Jan. 03, 2017 USD ($) | Jan. 03, 2017 EUR (€) | Nov. 30, 2016 USD ($) | Nov. 30, 2016 EUR (€) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment to acquire business |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,504 | $ 121,065 | $ 98,235 |
Percentage of voting rights sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00%
Proceeds from divestiture |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,254 |  | 8,254 | 0 | 0 |
Loss on divestitures |  |  |  |  |  |  |  |  |  |  |  |  | 5,587 |  | $ 6,469 | $ 0 | $ 0 |
Frost Converting Systems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment to acquire business | $ 7,162 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Memorialization Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment to acquire business |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |
GJ Creative Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of business before acquisition |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  | $ 37,596 | € 30.5 |  |  |  |  |  |  |  |  |  |  |  |  |
RAF Technology, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  |  |  | $ 8,717 |  |  |  |  |  |  |  |  |  |  |  |
VCG (Holdings) Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  |  |  |  | $ 10,695 | € 8.8 |  |  |  |  |  |  |  |  |  |
Ungricht |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of business before acquisition |  |  |  |  |  |  |  |  | $ 35 |  |  |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  |  |  |  |  |  | $ 25,185 | € 24.0 |  |  |  |  |  |  |  |
Guidance Automation Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  |  |  |  |  |  |  |  | $ 9,974 | € 8.0 |  |  |  |  |  |
Memorialization Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on divestitures |  |  |  |  |  |  |  |  |  |  |  |  | $ 882 |  |  |  |  |

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