Transactions with Affiliated Companies - Additional Information (Details) |
6 Months Ended |
|---|---|
Mar. 31, 2026 | |
| Minimum | |
| Investments In And Advances To Affiliates [Line Items] | |
| Ownership percentage of voting securities | 5.00% |
| Investment, Affiliated Issuer, Controlled | Maximum | |
| Investments In And Advances To Affiliates [Line Items] | |
| Ownership percentage of voting securities | 25.00% |
| Investment, Affiliated Issuer, Noncontrolled | Minimum | |
| Investments In And Advances To Affiliates [Line Items] | |
| Ownership percentage of voting securities | 5.00% |
| Investment, Affiliated Issuer, Noncontrolled | Maximum | |
| Investments In And Advances To Affiliates [Line Items] | |
| Ownership percentage of voting securities | 25.00% |