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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 100,461 $ 100,461
Accumulated Amortization 26,623 19,434
Net $ 73,838 81,027
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 22,182 16,222
Net $ 66,914 72,874
Intellectual property    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 13 years  
Gross Carrying Amount $ 1,500 1,500
Accumulated Amortization 216 103
Net $ 1,284 1,397
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 1,158 842
Net $ 4,707 5,023
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 3,067 2,267
Net $ 933 $ 1,733