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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets, net by major class (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
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Finite-Lived intangible assets |  |
Carrying Amount, Gross | $ 378,471 | $ 380,699
Accumulated Amortization | (60,918) | (34,813)
Carrying Amount, Net | 317,553 | 345,886
Customer relationships |  |
Finite-Lived intangible assets |  |
Carrying Amount, Gross | 317,272 | 318,896
Accumulated Amortization | (47,771) | (26,990)
Carrying Amount, Net | 269,501 | 291,906
Intellectual property |  |
Finite-Lived intangible assets |  |
Carrying Amount, Gross | 56,393 | 56,997
Accumulated Amortization | (10,667) | (5,767)
Carrying Amount, Net | 45,726 | 51,230
Non-compete agreements |  |
Finite-Lived intangible assets |  |
Carrying Amount, Gross | 2,410 | 2,410
Accumulated Amortization | (1,214) | (872)
Carrying Amount, Net | 1,196 | 1,538
Other |  |
Finite-Lived intangible assets |  |
Carrying Amount, Gross | 2,396 | 2,396
Accumulated Amortization | (1,266) | (1,184)
Carrying Amount, Net | $ 1,130 | $ 1,212

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