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ACCRUED EXPENSES AND OTHER LIABILITIES - Schedule Long-Term Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Sep. 30, 2025
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Payables and Accruals [Abstract] |  |
Escrow liabilities — long-term | $ 1,250 | $ 0
Accrued contingent consideration — long-term portion | 9,650 | 3,489
Deferred tax liability — long-term | 8,504 | 8,994
Deferred revenue — long-term | 3,224 | 808
Other long-term liabilities | 781 | 1,553
Other long-term liabilities | $ 23,409 | $ 14,844

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