v3.26.3
Fair Value Summary of fair value Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Sep. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure $ 4,833 $ 4,428
Financial Transmission Rights Fair Value Disclosure 4,947 1,584
Assets, Fair Value Disclosure 9,825 6,012
Financial and Nonfinancial Liabilities, Fair Value Disclosure 2,743 0
Trading Liabilities, Fair Value Disclosure 2,743 0
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 4,833 4,428
Financial Transmission Rights Fair Value Disclosure 0 0
Assets, Fair Value Disclosure 4,833 4,428
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Trading Liabilities, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 0 0
Financial Transmission Rights Fair Value Disclosure 0 0
Assets, Fair Value Disclosure 45 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 2,743 0
Trading Liabilities, Fair Value Disclosure 2,743 0
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 0 0
Financial Transmission Rights Fair Value Disclosure 4,947 1,584
Assets, Fair Value Disclosure 4,947 1,584
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Trading Liabilities, Fair Value Disclosure 0 0
Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 144 104
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 144 104
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 0 0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 0 0
Mutual Fund [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 4,689 4,324
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 4,689 4,324
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 0 0
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure $ 0 $ 0