v3.25.2
Loans and Borrowings - Schedule of Principal and Interest Payable Outstanding Amounts (Details) - EUR (€)
€ in Thousands
 9 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Disclosure of detailed information about borrowings [line items]    
Senior Note embedded derivative € 28,638 € 28,638
Less: amortization under the effective interest method (24,097) (23,361)
Non-current liabilities 1,161,547 1,164,688
Current liabilities € 15,572 24,670
Term Loan | EUR    
Disclosure of detailed information about borrowings [line items]    
Borrowings, maturity 2029  
Non-current liabilities, gross € 375,000 375,000
Term Loan | USD    
Disclosure of detailed information about borrowings [line items]    
Borrowings, maturity 2029  
Non-current liabilities, gross € 140,639 152,883
Current liabilities € 7,257 7,890
Vendor Loan | EUR    
Disclosure of detailed information about borrowings [line items]    
Borrowings, maturity 2029  
Non-current liabilities, gross € 217,408 208,305
Senior Notes | EUR    
Disclosure of detailed information about borrowings [line items]    
Borrowings, maturity 2029  
Non-current liabilities, gross € 428,500 428,500
Term Loan interest payable    
Disclosure of detailed information about borrowings [line items]    
Non-current liabilities, gross 1,166,088 1,169,965
Term Loan interest payable | EUR    
Disclosure of detailed information about borrowings [line items]    
Current liabilities 2,305 3,591
Term Loan interest payable | USD    
Disclosure of detailed information about borrowings [line items]    
Current liabilities 673  
Vendor Loan interest payable | EUR    
Disclosure of detailed information about borrowings [line items]    
Current liabilities 1,588 3,816
Senior Notes interest payable | EUR    
Disclosure of detailed information about borrowings [line items]    
Current liabilities € 3,749 € 9,373