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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019
Intangible Assets |  |
Gross Carrying Amount | $ 100,461 | $ 98,961
Accumulated Amortization | 15,928 | 12,245
Net | $ 84,533 | 86,716
Developed technology |  |
Intangible Assets |  |
Weighted Average Estimated Useful Lives | 15 years |
Gross Carrying Amount | $ 89,096 | 89,096
Accumulated Amortization | 13,331 | 10,256
Net | $ 75,765 | 78,840
Intellectual property |  |
Intangible Assets |  |
Weighted Average Estimated Useful Lives | 13 years |
Gross Carrying Amount | $ 1,500 | 0
Accumulated Amortization | 47 | 0
Net | $ 1,453 | 0
Trade name |  |
Intangible Assets |  |
Weighted Average Estimated Useful Lives | 20 years |
Gross Carrying Amount | $ 5,865 | 5,865
Accumulated Amortization | 683 | 522
Net | $ 5,182 | 5,343
Customer relationships |  |
Intangible Assets |  |
Weighted Average Estimated Useful Lives | 5 years |
Gross Carrying Amount | $ 4,000 | 4,000
Accumulated Amortization | 1,867 | 1,467
Net | $ 2,133 | $ 2,533

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