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Transactions with Controlled Companies - Valley Electric Company, Inc. (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Interest Income $ 184,615 $ 202,447  
Other Income 9,283 30,739  
Interest Receivable $ 27,486   $ 26,936
Valley Electric Holdings II, Inc. | Valley Electric Holdings I, Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Ownership interest 100.00%    
Valley Electric Company, Inc. | Members of Valley Electric Company, Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Ownership interest 5.01%    
Valley Electric Company, Inc. | Valley Electric Holdings II, Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Ownership interest 94.99%    
VE Company, Inc. | Valley Electric Company, Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Ownership interest 100.00%    
Valley Electric Co. of Mt. Vernon, Inc. | VE Company, Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Ownership interest 100.00%    
Reportable Legal Entities | Subsidiaries | Valley Electric Company, Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Interest Income $ 3,174 3,020  
Royalty, net profit and revenue interests 167 167  
Other Income 167 167  
Interest Receivable 137   2,974
Other 3   $ 2
Reportable Legal Entities | Subsidiaries | Valley Electric Company, Inc. | Prospect Administration      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Managerial Assistance 150 150  
Reimbursement of Legal, Tax, etc. $ 3 0  
Reportable Legal Entities | Subsidiaries | Valley Electric Holdings I, Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Ownership interest 100.00%    
Reportable Legal Entities | Subsidiaries | Valley Electric Company, Inc. | Valley Electric Company, Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Interest Income $ 2,825 2,649  
Reportable Legal Entities | Subsidiaries | Valley Electric Co. of Mt. Vernon, Inc. | Valley Electric Company, Inc.      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]      
Interest Income $ 349 $ 371