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WARRANTY LIABILITY - Changes in Warrant Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]        
Balance, beginning of period $ 13,123 $ 15,461 $ 13,050 $ 20,781
Warranties issued and changes in estimated pre-existing warranties 5,119 9,104 10,321 10,044
Actual warranty costs incurred (5,989) (9,662) (11,118) (15,922)
Balance, end of period $ 12,253 $ 14,903 $ 12,253 $ 14,903