Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Sep. 30, 2024 |
|---|---|---|
| Commitments and Contingencies Disclosure [Abstract] | ||
| Unfunded Commitment | $ 1,000,470 | $ 642,044 |
| Investment company, financial support to investee contractually required, not provided, amount that can be drawn immediately | $ 986,193 | $ 600,609 |