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INCOME TAXES (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Income Tax Contingency [Line Items]      
Forecasted effective tax rate 21.70% 21.90%  
Revaluation of deferred tax assets and liabilities $ (0.8) $ (16.3)  
Reversal of a valuation allowance for certain deferred tax assets   $ (15.8)  
Actual effective tax rate 21.40% 15.90%  
ITC carryforward $ 186.0   $ 191.2
Effective term 20 years    
Operating loss carryforward, valuation allowance $ 0.7   0.7
State      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards $ 627.1   $ 631.2
State | Minimum      
Income Tax Contingency [Line Items]      
Effective term 7 years    
State | Maximum      
Income Tax Contingency [Line Items]      
Effective term 20 years