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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended |
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Jun. 30, 2019 | Sep. 30, 2018
Intangible Assets |  |
Gross Carrying Amount | $ 79,900 | $ 79,700
Accumulated Amortization | 10,807 | 6,493
Net | $ 69,093 | 73,207
Developed technology |  |
Intangible Assets |  |
Estimated Useful Lives | 15 years |
Gross Carrying Amount | $ 70,200 | 70,000
Accumulated Amortization | 9,089 | 5,589
Net | $ 61,111 | 64,411
Trade name |  |
Intangible Assets |  |
Estimated Useful Lives | 20 years |
Gross Carrying Amount | $ 5,700 | 5,700
Accumulated Amortization | 451 | 237
Net | $ 5,249 | 5,463
Customer relationships |  |
Intangible Assets |  |
Estimated Useful Lives | 5 years |
Gross Carrying Amount | $ 4,000 | 4,000
Accumulated Amortization | 1,267 | 667
Net | $ 2,733 | $ 3,333

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