WARRANTY LIABILITY - Schedule of Changes in Warranty Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of period	$ 10,143	$ 13,050
Warranties issued and changes in estimated pre-existing warranties	4,191	5,202
Actual warranty costs incurred	(3,270)	(5,129)
Balance, end of period	$ 11,064	$ 13,123