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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2022
Summary Of Significant Accounting Policies [Line Items]            
Gas Stored Underground $ 12,336   $ 12,336   $ 33,669  
Capitalized Costs Oil and Gas Producing Activities Net $ 1,800,000   1,800,000   1,900,000  
Capitalized costs of unproved properties excluded from amortization     $ 105,500   103,800  
Full cost ceiling test discount factor 10.00%   10.00%      
Amount Full Cost Ceiling Exceeds Book Value Of Oil And Gas Properties $ 2,400,000   $ 2,400,000      
Decrease estimated future net cash flows (757,600)          
Other Post-Retirement Adjustment for Regulatory Proceeding $ 0 $ 0 (7,351) $ 0    
Other Post-Retirement Adjustment for Regulatory Proceeding After Tax     $ (5,807)      
Antidilutive securities 873 334,335 6,990 333,445    
Reserve For Gas Replacement [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Gas Stored Underground $ 21,775   $ 21,775   $ 0  
Restricted Stock Units [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Share based compensation other than options grants in period     128,950      
Granted in fiscal year, weighted average grant date fair value     $ 54.10      
Performance Shares [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Share based compensation other than options grants in period     195,397      
Granted in fiscal year, weighted average grant date fair value     $ 65.39      
Subsequent Event [Member] | Reserve For Gas Replacement [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Gas Stored Underground           $ 0