Financial Instruments and Financial Risk Management - Additional Information (Details) - EUR (€) |
3 Months Ended | 6 Months Ended | 12 Months Ended |
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2025 |
Sep. 30, 2024 |
|
| Disclosure of fair value measurement [abstract] | |||
| Transfers out of level 1 into level 2 of fair value hierarchy, liabilities held at end of reporting period | € 0 | € 0 | |
| Decrease in fair value recorded through Finance cost, net | € 5,600,000 | € 8,800,000 | |
| Percentge of increase decrease in yield volatility | 2.50% | ||
| Percentage of yield volatility | 40.00% | ||
| Increase/decrease in fair value | € 1,300,000 | ||
| Percentage of credit spread | 1.36% |