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WARRANTY LIABILITY - Summary of changes in warrant liability included in accrued liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
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