v3.26.1
Transactions with Controlled Companies - Universal Turbine Parts, LLC (Details)
$ in Thousands
 12 Months Ended
Jun. 30, 2026
USD ($)
director
Jun. 30, 2025
USD ($)
director
Jun. 30, 2024
USD ($)
Dec. 10, 2018
director
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Interest Income $ 581,932 $ 671,109 $ 770,312  
Dividend Income 46,967 19,378 11,953  
Structuring Fee 9,000 12,348 27,666  
Total Other Income 10,555 28,949 79,397  
Interest Receivable $ 17,350 $ 25,144    
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 $ 6,043 $ 4,755 4,030  
Dividend Income 6,179 0 0  
Structuring Fee 0 300 0  
Total Other Income 0 300 0  
Additions 0 20,000 2,500  
Interest Income Capitalized as PIK 6,179 0 0  
Repayment of Loan Receivable 248 107 49  
Interest Receivable 16 17    
Other Receivables 4 10    
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  
Reimbursement of Legal, Tax, etc $ 14 $ 21 $ 3,345