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Fair Value Measurements (Recurring Fair Value Measures Of Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash Equivalents - Money Market Mutual Funds [1] $ 35,015 $ 22,269    
Hedging Collateral Deposits 91,670 [1] 88,610 [1] $ 0 $ 6,832
Total Assets [1] 188,714 215,951    
Total Liabilities [1] 785,659 616,410    
Total Net Assets/(Liabilities) [1] (596,945) (400,459)    
Over The Counter Swaps - Gas And Oil [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset [1]   $ 0    
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Derivative Liability [1]   $ 599,749    
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Over The Counter Swaps - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset [1] $ 999      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Derivative Liability [1] $ 513,286      
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Contingent Consideration for Asset Sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset [1] $ 8,176      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] [1] Fair Value of Derivative Financial Instruments      
Foreign Currency Contracts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset [1] $ 0 $ 0    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Derivative Liability [1] $ 1,920 $ (724)    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Balanced Equity Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments [1] $ 19,506 $ 34,433    
Fixed Income Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments [1] 33,348 70,639    
Over the Counter No Cost Collars - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Liability [1] $ 270,453 $ 17,385    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash Equivalents - Money Market Mutual Funds $ 35,015 $ 22,269    
Hedging Collateral Deposits 91,670 88,610    
Total Assets 179,539 215,951    
Total Liabilities 0 0    
Total Net Assets/(Liabilities) 179,539 215,951    
Fair Value, Inputs, Level 1 [Member] | Over The Counter Swaps - Gas And Oil [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset   $ 0    
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Derivative Liability   $ 0    
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Fair Value, Inputs, Level 1 [Member] | Over The Counter Swaps - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset $ 0      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Derivative Liability $ 0      
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Fair Value, Inputs, Level 1 [Member] | Contingent Consideration for Asset Sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset $ 0      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset $ 0 $ 0    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Derivative Liability $ 0 $ 0    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Fair Value, Inputs, Level 1 [Member] | Balanced Equity Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments $ 19,506 $ 34,433    
Fair Value, Inputs, Level 1 [Member] | Fixed Income Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments 33,348 70,639    
Fair Value, Inputs, Level 1 [Member] | Over the Counter No Cost Collars - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Liability $ 0 $ 0    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash Equivalents - Money Market Mutual Funds $ 0 $ 0    
Hedging Collateral Deposits 0 0    
Total Assets 13,481 2,740    
Total Liabilities 789,965 619,150    
Total Net Assets/(Liabilities) (776,484) (616,410)    
Fair Value, Inputs, Level 2 [Member] | Over The Counter Swaps - Gas And Oil [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset   $ 1,802    
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Derivative Liability   $ 601,551    
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Fair Value, Inputs, Level 2 [Member] | Over The Counter Swaps - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset $ 5,177      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Derivative Liability $ 517,464      
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Fair Value, Inputs, Level 2 [Member] | Contingent Consideration for Asset Sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset $ 8,176      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset $ 128 $ 938    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Derivative Liability $ 2,048 $ 214    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Fair Value, Inputs, Level 2 [Member] | Balanced Equity Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments $ 0 $ 0    
Fair Value, Inputs, Level 2 [Member] | Fixed Income Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments 0 0    
Fair Value, Inputs, Level 2 [Member] | Over the Counter No Cost Collars - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Liability $ 270,453 $ 17,385    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash Equivalents - Money Market Mutual Funds $ 0 $ 0    
Hedging Collateral Deposits 0 0    
Total Assets 0 0    
Total Liabilities 0 0    
Total Net Assets/(Liabilities) 0 0    
Fair Value, Inputs, Level 3 [Member] | Over The Counter Swaps - Gas And Oil [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset   $ 0    
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Derivative Liability   $ 0    
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Fair Value, Inputs, Level 3 [Member] | Over The Counter Swaps - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset $ 0      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Derivative Liability $ 0      
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration for Asset Sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset $ 0      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset $ 0 $ 0    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Derivative Liability $ 0 $ 0    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Fair Value, Inputs, Level 3 [Member] | Balanced Equity Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments $ 0 $ 0    
Fair Value, Inputs, Level 3 [Member] | Fixed Income Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments 0 0    
Fair Value, Inputs, Level 3 [Member] | Over the Counter No Cost Collars - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Liability $ 0 $ 0    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Netting Adjustments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash Equivalents - Money Market Mutual Funds [1] $ 0 $ 0    
Hedging Collateral Deposits [1] 0 0    
Total Assets [1] (4,306) (2,740)    
Total Liabilities [1] (4,306) (2,740)    
Total Net Assets/(Liabilities) [1] 0 0    
Netting Adjustments [Member] | Over The Counter Swaps - Gas And Oil [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset [1]   $ (1,802)    
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Derivative Liability [1]   $ (1,802)    
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Fair Value of Derivative Financial Instruments    
Netting Adjustments [Member] | Over The Counter Swaps - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset [1] $ (4,178)      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Derivative Liability [1] $ (4,178)      
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments      
Netting Adjustments [Member] | Contingent Consideration for Asset Sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset [1] $ 0      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] [1] Fair Value of Derivative Financial Instruments      
Netting Adjustments [Member] | Foreign Currency Contracts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Asset [1] $ (128) $ (938)    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Derivative Liability [1] $ (128) $ (938)    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
Netting Adjustments [Member] | Balanced Equity Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments [1] $ 0 $ 0    
Netting Adjustments [Member] | Fixed Income Mutual Fund [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Other Investments [1] 0 0    
Netting Adjustments [Member] | Over the Counter No Cost Collars - Gas [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Derivative Liability [1] $ 0 $ 0    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value of Derivative Financial Instruments Fair Value of Derivative Financial Instruments    
[1] Netting Adjustments represent the impact of legally-enforceable master netting arrangements that allow the Company to net gain and loss positions held with the same counterparties. The net asset or net liability for each counterparty is recorded as an asset or liability on the Company’s balance sheet.