v3.26.1
Transactions with Controlled Companies - R-V Industries, Inc. (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Dec. 15, 2020
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  
Advisory Fee 9,000 12,348 27,666  
Total Other Income 10,555 28,949 79,397  
Interest Receivable $ 17,350 25,144    
Senior Subordinated Notes        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Restructured debt       $ 28,622
First Lien Note        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Principal amount       $ 28,622
R-V Industries, Inc. | R-V Holdings of Delaware, LLC        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Ownership interest 90.28%      
R-V Industries, Inc. | Members of R-V Industries Management        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Ownership interest 9.72%      
Reportable Legal Entities | Subsidiaries | R-V Industries, Inc.        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Interest Income $ 6,333 5,558 5,358  
Dividend Income 13,288 8,774 0  
Advisory Fee 0 0 106  
Total Other Income 0 0 106  
Additions 14,000 10,000 3,700  
Interest Receivable 0 16    
Other Receivables 10 8    
Reportable Legal Entities | Subsidiaries | R-V Industries, Inc. | Prospect Administration        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Managerial Assistance 180 180 180  
Reimbursement of Legal, Tax, etc $ 13 $ 14 $ 17  
Reportable Legal Entities | Subsidiaries | R-V Holdings of Delaware, LLC        
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]        
Ownership interest 100.00%