INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Forecasted effective tax rate	22.50%	21.60%
Revaluation of deferred tax assets and liabilities	$ (554)	$ 166
Actual effective tax rate	22.20%	21.70%
ITC carryforward	$ 177,800		$ 211,800
Effective term	20 years
Potential net capital loss	$ 56,600		56,600
Valuation allowance	21,900		22,200
Operating loss carryforward, valuation allowance	$ 16,900		17,200
Investment tax credit, solar property, percentage	26.00%	26.00%		26.00%
Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, valuation allowance	$ 5,100		5,100
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 515,100		$ 544,400
State | Minimum
Operating Loss Carryforwards [Line Items]
Effective term	7 years
State | Maximum
Operating Loss Carryforwards [Line Items]
Effective term	20 years