v3.25.2
Transactions with Controlled Companies - Universal Turbine Parts, LLC (Details)
$ in Thousands
 12 Months Ended
Jun. 30, 2025
USD ($)
director
Jun. 30, 2024
USD ($)
director
Jun. 30, 2023
USD ($)
Dec. 10, 2018
director
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Interest Income $ 671,109 $ 770,312 $ 760,785  
Structuring Fee 12,348 27,666 18,131  
Total Other Income 28,949 79,397 83,023  
Interest Receivable $ 25,144 $ 26,936    
Universal Turbine Parts, LLC        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Number of board of directors appointed | director 3 3   3
Universal Turbine Parts, LLC | Reportable Legal Entities | Subsidiaries        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Interest Income $ 4,755 $ 4,030 3,280  
Structuring Fee 300 0 0  
Total Other Income 300 0 0  
Reimbursement of Legal, Tax, etc 21 3,345 0  
Additions 20,000 2,500 0  
Repayment of Loan Receivable 107 49 32  
Interest Receivable 17 34    
Other Receivables 10 1    
Universal Turbine Parts, LLC | Reportable Legal Entities | Subsidiaries | Prospect Administration        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Managerial Assistance $ 10 $ 10 $ 10