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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Indefinite-lived Intangible Assets [Line Items] |  |
Cost | $ 128,617 | $ 128,617
Accumulated Amortization | 63,943 | 52,861
Total | $ 64,674 | $ 75,756
Completed technologies |  |
Indefinite-lived Intangible Assets [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 | 39,254 | 32,265
Total | $ 56,507 | $ 63,496
Customer relationships |  |
Indefinite-lived Intangible Assets [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 | 21,396 | 18,241
Total | $ 3,772 | $ 6,927
Trade names |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (in years) | 5 years | 5 years
Cost | $ 7,088 | $ 7,088
Accumulated Amortization | 2,967 | 2,174
Total | $ 4,121 | $ 4,914
Covenants not to compete |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (in years) | 3 years | 3 years
Cost | $ 600 | $ 600
Accumulated Amortization | 326 | 181
Total | $ 274 | $ 419

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