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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2021
Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 100,461 $ 100,461
Accumulated Amortization 24,827 19,434
Net $ 75,634 81,027
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 15 years  
Gross Carrying Amount $ 89,096 89,096
Accumulated Amortization 20,693 16,222
Net $ 68,403 72,874
Intellectual property    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 13 years  
Gross Carrying Amount $ 1,500 1,500
Accumulated Amortization 188 103
Net $ 1,312 1,397
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 20 years  
Gross Carrying Amount $ 5,865 5,865
Accumulated Amortization 1,079 842
Net $ 4,786 5,023
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 5 years  
Gross Carrying Amount $ 4,000 4,000
Accumulated Amortization 2,867 2,267
Net $ 1,133 $ 1,733