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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Indefinite Lived Intangible Assets By Major Class [Line Items]      
Cost $ 128,617 $ 128,617  
Accumulated Amortization 58,203 52,861  
Net $ 70,414 $ 75,756 $ 85,743
Completed technologies      
Indefinite Lived Intangible Assets By Major Class [Line Items]      
Weighted Average Amortization Period (in years) 6 years 10 months 24 days 6 years 10 months 24 days  
Cost $ 95,761 $ 95,761  
Accumulated Amortization 34,585 32,265  
Net $ 61,176 $ 63,496  
Customer relationships      
Indefinite Lived Intangible Assets By Major Class [Line Items]      
Weighted Average Amortization Period (in years) 4 years 8 months 12 days 4 years 8 months 12 days  
Cost $ 25,168 $ 25,168  
Accumulated Amortization 20,832 18,241  
Net $ 4,336 $ 6,927  
Trade names      
Indefinite Lived Intangible Assets By Major Class [Line Items]      
Weighted Average Amortization Period (in years) 5 years 5 years  
Cost $ 7,088 $ 7,088  
Accumulated Amortization 2,518 2,174  
Net $ 4,570 $ 4,914  
Covenants not to compete      
Indefinite Lived Intangible Assets By Major Class [Line Items]      
Weighted Average Amortization Period (in years) 3 years 3 years  
Cost $ 600 $ 600  
Accumulated Amortization 268 181  
Net $ 332 $ 419