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INCOME TAXES (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Operating Loss Carryforwards [Line Items]
Deferred employer portion of OASDI	$ 5.1		$ 3.1
Forecasted effective tax rate	19.90%	18.10%
Revaluation of deferred tax assets and liabilities	$ 11.8	$ 2.3
Actual effective tax rate	24.00%	16.60%
Deferred tax assets, operating loss carryforwards, domestic, refundable and receivables	$ 22.8		22.8
Deferred tax assets, operating loss carryforwards, domestic	24.1
ITC carryforward	$ 219.3		195.2
Effective term	20 years
Potential net capital loss	$ 70.3
Valuation allowance	25.0		17.6
Operating loss carryforward, valuation allowance	17.6
Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, valuation allowance	7.3
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards			134.0
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 465.7		$ 487.7
State | Minimum
Operating Loss Carryforwards [Line Items]
Effective term	7 years
State | Maximum
Operating Loss Carryforwards [Line Items]
Effective term	20 years

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