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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 100,461 $ 100,461
Accumulated Amortization 28,419 26,623
Net $ 72,042 73,838
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 15 years  
Gross Carrying Amount $ 89,096 89,096
Accumulated Amortization 23,671 22,182
Net $ 65,425 66,914
Intellectual property    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 13 years  
Gross Carrying Amount $ 1,500 1,500
Accumulated Amortization 244 216
Net $ 1,256 1,284
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 20 years  
Gross Carrying Amount $ 5,865 5,865
Accumulated Amortization 1,237 1,158
Net $ 4,628 4,707
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Estimated Useful Lives 5 years  
Gross Carrying Amount $ 4,000 4,000
Accumulated Amortization 3,267 3,067
Net $ 733 $ 933