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Transactions with Affiliated Companies - Additional Information (Details)
9 Months Ended
Jun. 30, 2024
Minimum  
Investments In And Advances To Affiliates [Line Items]  
Ownership percentage of voting securities 5.00%
Non-controlled, Affiliated Investments | Minimum  
Investments In And Advances To Affiliates [Line Items]  
Ownership percentage of voting securities 5.00%
Non-controlled, Affiliated Investments | Maximum  
Investments In And Advances To Affiliates [Line Items]  
Ownership percentage of voting securities 25.00%
Controlled, Affiliated Investments | Maximum  
Investments In And Advances To Affiliates [Line Items]  
Ownership percentage of voting securities 25.00%