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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 96,961 | $ 96,961
Accumulated Amortization | 39,601 | 36,386
Net | $ 57,360 | 60,575
Developed technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 15 years |
Gross Carrying Amount | $ 89,096 | 89,096
Accumulated Amortization | 37,070 | 34,092
Net | $ 52,026 | 55,004
Intellectual property |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 13 years |
Gross Carrying Amount | $ 2,000 | 2,000
Accumulated Amortization | 582 | 503
Net | $ 1,418 | 1,497
Trade name |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 20 years |
Gross Carrying Amount | $ 5,865 | 5,865
Accumulated Amortization | 1,949 | 1,791
Net | $ 3,916 | $ 4,074

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