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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 |

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