v3.23.3
Related Party Transactions (Details)
 12 Months Ended
May 03, 2019
May 02, 2019
Sep. 30, 2023
USD ($)
component
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Related Party Transaction [Line Items]          
Base management fee and incentive fee payable     $ 19,547,000 $ 15,940,000  
Base management fee rate (as a percent) 1.00% 1.50%      
Base management fee, threshold (as a percent) 200.00%        
Base management fee     44,899,000 39,556,000 $ 32,288,000
Part I incentive fee     35,831,000 26,644,000 21,598,000
Due to affiliate     $ 4,310,000 3,180,000  
Affiliated Entity          
Related Party Transaction [Line Items]          
Related party transaction, termination, notice period     60 days    
Administrator expense     $ 1,500,000 1,500,000 1,700,000
General and administrative expenses     300,000 300,000 200,000
Due to affiliate     4,300,000 3,200,000  
Oaktree Strategic Income Corporation Merger          
Related Party Transaction [Line Items]          
Investment company, contractual fee waived     $ 6,000,000    
Contractual fee waived, period otherwise receivable (in years)     2 years    
Contractual fee waived, per quarter     $ 750,000    
Oaktree Strategic Income II, Inc. Merger          
Related Party Transaction [Line Items]          
Investment company, contractual fee waived     9,000,000    
Oaktree Strategic Income II, Inc Merger, Year One          
Related Party Transaction [Line Items]          
Investment company, contractual fee waived     6,000,000    
Contractual fee waived, per quarter     1,500,000    
Oaktree Strategic Income II, Inc Merger, Year Two          
Related Party Transaction [Line Items]          
Investment company, contractual fee waived     3,000,000    
Contractual fee waived, per quarter     $ 750,000    
Investment Advisory Agreement          
Related Party Transaction [Line Items]          
Number of components | component     2    
Related party transaction, termination, notice period     60 days    
Base management fee     $ 39,400,000 36,600,000 30,700,000
Management incentive rate     1.50%    
Investment Advisory Agreement | Affiliated Entity          
Related Party Transaction [Line Items]          
Part I incentive fee     $ 35,800,000 26,600,000 21,600,000
Incentive fee expense     9,600,000 0 8,800,000
Accrued capital gains incentive fees expensed (reversed)     $ 0 $ (8,800,000) $ 17,600,000
Investment Advisory Agreement Incentive Rate Pre Incentive Fee Net Investment Income Below Catch Up          
Related Party Transaction [Line Items]          
Management incentive rate     100.00%    
Investment Advisory Agreement Incentive Rate Quarterly Catch Up Threshold          
Related Party Transaction [Line Items]          
Management incentive rate     1.8182%    
Investment Advisory Agreement Cumulative Pre Incentive Fee Net Investment Income          
Related Party Transaction [Line Items]          
Management incentive rate     17.50%    
Investment Advisory Agreement - Incentive Rate, Realized Capital Gains | Affiliated Entity          
Related Party Transaction [Line Items]          
Management incentive rate     17.50%