Accounting Policies - Additional Information (Details) |
12 Months Ended | |
|---|---|---|
|
Sep. 30, 2025
EUR (€)
Segment
|
Sep. 30, 2024
EUR (€)
|
|
| Disclosure of changes in accounting estimates [line items] | ||
| Number of operating segments of cash generating unit | Segment | 3 | |
| Amount reclassified from treasury shares to share premium | € 355,800,000 | |
| Incremental expense | € 11,700,000 | |
| Restricted cash | € 0 | |
| Office Equipment and Storage Facilities | ||
| Disclosure of changes in accounting estimates [line items] | ||
| Lease term | 12 months | |