BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2025 USD ($)
Disaggregation of Revenue [Line Items]
Reduction of revenue for economic value of tax credits to be transferred	$ 52,989
Benefit to tax provision related to tax credits	(58,369)
Liability for credits to be transferred	$ 12,985
Minimum
Disaggregation of Revenue [Line Items]
Performance obligation and payment period	30 days
Maximum
Disaggregation of Revenue [Line Items]
Performance obligation and payment period	60 days