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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 98,961 | $ 79,700
Accumulated Amortization | 12,245 | 6,493
Net | $ 86,716 | 73,207
Developed technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 15 years |
Gross Carrying Amount | $ 89,096 | 70,000
Accumulated Amortization | 10,256 | 5,589
Net | $ 78,840 | 64,411
Trade name |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 20 years |
Gross Carrying Amount | $ 5,865 | 5,700
Accumulated Amortization | 522 | 237
Net | $ 5,343 | 5,463
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Estimated Useful Lives | 5 years |
Gross Carrying Amount | $ 4,000 | 4,000
Accumulated Amortization | 1,467 | 667
Net | $ 2,533 | $ 3,333

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