Summary of Significant Accounting Policies and Estimates - Cash Restrictions (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Summary of Significant Accounting Policies and Estimates | ||
| Total restricted cash | $ 25,590 | $ 23,862 |
| Collateral for credit card program | ||
| Summary of Significant Accounting Policies and Estimates | ||
| Total restricted cash | 6,321 | 6,112 |
| Collateral for outstanding bank guarantees | ||
| Summary of Significant Accounting Policies and Estimates | ||
| Total restricted cash | 8,568 | 7,309 |
| Collateral for surety program | ||
| Summary of Significant Accounting Policies and Estimates | ||
| Total restricted cash | 10,556 | 10,370 |
| Term deposits | ||
| Summary of Significant Accounting Policies and Estimates | ||
| Total restricted cash | $ 145 | $ 71 |