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INTANGIBLE ASSETS - Intangible Assets, net by major class (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
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Finite-Lived intangible assets |  |
Carrying Amount, Gross | $ 378,350 | $ 377,994
Accumulated Amortization | (87,019) | (69,566)
Carrying Amount, Net | 291,331 | 308,428
Client relationships |  |
Finite-Lived intangible assets |  |
Carrying Amount, Gross | 317,137 | 316,820
Accumulated Amortization | (68,659) | (54,711)
Carrying Amount, Net | 248,478 | 262,109
Intellectual property |  |
Finite-Lived intangible assets |  |
Carrying Amount, Gross | 56,376 | 56,337
Accumulated Amortization | (15,468) | (12,234)
Carrying Amount, Net | 40,908 | 44,103
Other |  |
Finite-Lived intangible assets |  |
Carrying Amount, Gross | 4,837 | 4,837
Accumulated Amortization | (2,892) | (2,621)
Carrying Amount, Net | $ 1,945 | $ 2,216

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