Operating Expenses - Additional Information (Details) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2024 |
Sep. 30, 2023 |
Sep. 30, 2022 |
|
| German Govermental Plan | |||
| Disclosure of attribution of expenses by nature to their function [line items] | |||
| Employers contribution to pension plan percent | 9.30% | ||
| Employers contribution to pension plan amount | € 17.5 | € 15.0 | € 12.3 |
| DC plans US | |||
| Disclosure of attribution of expenses by nature to their function [line items] | |||
| Employers contribution to pension plan amount | € 1.9 | € 1.6 | € 1.6 |