INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Income Tax Contingency [Line Items]
Forecasted effective tax rate	23.20%	21.50%
Actual effective tax rate	22.20%	20.40%
ITC carryforward	$ 190.8		$ 191.6
Effective term	20 years
Operating loss carryforward, valuation allowance	$ 0.5		0.6
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 599.3		$ 634.7
State | Minimum
Income Tax Contingency [Line Items]
Effective term	7 years
State | Maximum
Income Tax Contingency [Line Items]
Effective term	20 years