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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Intangible Assets    
Gross Carrying Amount $ 100,461 $ 98,961
Accumulated Amortization 14,132 12,245
Net $ 86,329 86,716
Developed technology    
Intangible Assets    
Weighted Average Estimated Useful Lives 15 years  
Gross Carrying Amount $ 89,096 89,096
Accumulated Amortization 11,841 10,256
Net $ 77,255 78,840
Intellectual property    
Intangible Assets    
Weighted Average Estimated Useful Lives 13 years  
Gross Carrying Amount $ 1,500 0
Accumulated Amortization 19 0
Net $ 1,481 0
Trade name    
Intangible Assets    
Weighted Average Estimated Useful Lives 20 years  
Gross Carrying Amount $ 5,865 5,865
Accumulated Amortization 605 522
Net $ 5,260 5,343
Customer relationships    
Intangible Assets    
Weighted Average Estimated Useful Lives 5 years  
Gross Carrying Amount $ 4,000 4,000
Accumulated Amortization 1,667 1,467
Net $ 2,333 $ 2,533