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INCOME TAXES (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Income Tax Contingency [Line Items]
Forecasted effective tax rate, percentage	23.10%	21.70%
Actual effective tax rate, percentage	22.60%	21.40%
ITC carryforward	$ 192.0		$ 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	$ 453.8		$ 634.7
State | Minimum
Income Tax Contingency [Line Items]
Effective term	7 years
State | Maximum
Income Tax Contingency [Line Items]
Effective term	20 years

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Effective Income Tax Rate Reconciliation, Forecasted, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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