Summary of Significant Accounting Policies and Estimates - Government Incentives and Grants Narrative (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||
| Reduction to cost of goods and services | $ 18.9 | $ 0.0 |