v3.25.1
Related Party - Additional Information (Details) - EUR (€)
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Disclosure of transactions between related parties [line items]          
Non-employee director cash compensation per year € 300,000 € 300,000      
Right of use Assets 176,981,000   € 176,981,000   € 171,334,000
Ockenfels          
Disclosure of transactions between related parties [line items]          
Lease payments 100,000 100,000 200,000 € 200,000  
Lease liability 1,100,000   1,100,000   1,300,000
Right of use Assets 1,000,000   1,000,000   1,200,000
Income 100,000 0 100,000 0  
Restricted Share Units          
Disclosure of transactions between related parties [line items]          
Expenses recognized during period 100,000 100,000 200,000 200,000  
Other Curret Assets | Ockenfels          
Disclosure of transactions between related parties [line items]          
Outstanding receivables 9,800,000   9,800,000   9,800,000
Other Financial Liabilities - Current | Ockenfels          
Disclosure of transactions between related parties [line items]          
Outstanding payables 1,900,000   1,900,000   1,800,000
Other related parties [member]          
Disclosure of transactions between related parties [line items]          
Marketing expenses 0 0 100,000 0  
Lease liability 900,000   900,000   200,000
Right of use Assets 900,000   900,000   200,000
Consulting fees and cost reimbursements 100,000 100,000 200,000 300,000  
Sales 300,000 300,000 400,000 400,000  
TRA liability 373,700,000   373,700,000   € 359,900,000
Director compensation € 100,000 € 100,000 € 200,000 € 200,000