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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 100,461 | $ 100,461
Accumulated Amortization | 28,419 | 26,623
Net | $ 72,042 | 73,838
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 15 years |
Gross Carrying Amount | $ 89,096 | 89,096
Accumulated Amortization | 23,671 | 22,182
Net | $ 65,425 | 66,914
Intellectual property |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 13 years |
Gross Carrying Amount | $ 1,500 | 1,500
Accumulated Amortization | 244 | 216
Net | $ 1,256 | 1,284
Trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 20 years |
Gross Carrying Amount | $ 5,865 | 5,865
Accumulated Amortization | 1,237 | 1,158
Net | $ 4,628 | 4,707
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 5 years |
Gross Carrying Amount | $ 4,000 | 4,000
Accumulated Amortization | 3,267 | 3,067
Net | $ 733 | $ 933

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