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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 100,461 $ 98,961
Accumulated Amortization 19,434 12,245
Net $ 81,027 86,716
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 16,222 10,256
Net $ 72,874 78,840
Intellectual property    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 13 years  
Gross Carrying Amount $ 1,500 0
Accumulated Amortization 103 0
Net $ 1,397 0
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 842 522
Net $ 5,023 5,343
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 2,267 1,467
Net $ 1,733 $ 2,533