Summary of Significant Accounting Policies and Estimates - Non-controlling Interest (Details) |
Mar. 31, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Fluence Energy, LLC | ||
| Summary of Significant Accounting Policies and Estimates | ||
| Controlling Interest Ownership | 72.05% | 71.81% |
| AES Grid Stability | ||
| Summary of Significant Accounting Policies and Estimates | ||
| Non-Controlling Interest Ownership (AES) | 27.95% | 28.19% |