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WARRANTY LIABILITY - Changes in Warrant Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]    
Balance, beginning of period $ 16,786 $ 7,818
Warranties issued and changes in estimated pre-existing warranties 4,667 3,461
Actual warranty costs incurred (3,754) (1,707)
Balance, end of period $ 17,699 $ 9,572