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WARRANTY LIABILITY - Summary of changes in warrant liability included in accrued liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Movement in Standard Product Warranty Accrual [Roll Forward] |  |
Balance, beginning of period | $ 13,050 | $ 20,781
Warranties issued and changes in estimated pre-existing warranties | 19,300 | 23,253
Actual warranty costs incurred | (22,207) | (30,984)
Balance, end of period | $ 10,143 | $ 13,050

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