Financial Instruments and Financial Risk Management - Schedule of Fair Values and Fair Value Hierarchy of Financial Instruments Carried at Fair Value on Recurring Basis (Details) - Recurring Fair Value Measurement - FVtPL - EUR (€) € in Thousands |
Mar. 31, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Level 2 | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Currency derivative | € 1,736 | € 16,851 |
| Derivative liabilities | 7,441 | 347 |
| Level 3 | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Senior Note - embedded derivative | € 18,254 | € 22,796 |