Summary of Significant Accounting Policies and Estimates - Cash Restrictions (Details) - USD ($) $ in Thousands |
Dec. 31, 2024 |
Sep. 30, 2024 |
|---|---|---|
| Cash and Cash Equivalents [Line Items] | ||
| Restricted cash | $ 24,384 | $ 46,089 |
| Restricted cash included in “Other non-current assets” | 22,669 | 23,932 |
| Total restricted cash | 47,053 | 70,021 |
| Collateral for credit card program | ||
| Cash and Cash Equivalents [Line Items] | ||
| Restricted cash | 2,406 | 2,757 |
| Collateral for outstanding bank guarantees | ||
| Cash and Cash Equivalents [Line Items] | ||
| Restricted cash | 11,612 | 31,360 |
| Collateral for surety program | ||
| Cash and Cash Equivalents [Line Items] | ||
| Restricted cash | 9,662 | 9,551 |
| Restricted cash included in “Other non-current assets” | 22,669 | 23,932 |
| Term deposits | ||
| Cash and Cash Equivalents [Line Items] | ||
| Restricted cash | $ 704 | $ 2,421 |