INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
Income Tax Contingency [Line Items]
Forecasted effective tax rate, percentage	22.50%	23.20%
Actual effective tax rate, percentage	21.80%	22.20%
ITC carryforward	$ 128.6		$ 149.7
Effective term	20 years
Operating loss carryforward, valuation allowance	$ 0.4		0.4
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 353.1		$ 476.1
State | Minimum
Income Tax Contingency [Line Items]
Effective term	7 years
State | Maximum
Income Tax Contingency [Line Items]
Effective term	20 years