WARRANTY LIABILITY - Changes in Warrant Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance, beginning of period	$ 21,341	$ 19,197	$ 18,026	$ 7,818
Warranties issued and changes in estimated pre-existing warranties	4,999	5,119	16,079	14,368
Actual warranty costs incurred	(3,402)	(4,937)	(11,167)	(10,399)
Other warranty liabilities assumed from acquisitions	0	0	0	7,592
Balance, end of period	$ 22,938	$ 19,379	$ 22,938	$ 19,379