Statement Of Cash Flows [Abstract]
| Concept | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | 
                                                525,245
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                419,851
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Dividends received, classified as operating activities | 
                                                7,686,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                4,098,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Interest paid, classified as operating activities | 
                                                2,189
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                11,932
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Interest received, classified as operating activities | 
                                                18,081
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                9,012
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Income taxes paid (refund), classified as operating activities | 
                                                81,575
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                35,075
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) operating activities | 
                                                443,669
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                384,776
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) investing activities [abstract] | |||||
| Proceeds from sales of property, plant and equipment, classified as investing activities | 
                                                8,766,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                7,164,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Purchase of property, plant and equipment, classified as investing activities | 
                                                169,813
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                97,809
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Cash payments for futures contracts, forward contracts, option contracts and swap contracts, classified as investing activities | 
                                                494,408
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                343,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) investing activities | 
                                                329,445
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                156,591
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) financing activities [abstract] | |||||
| Proceeds from borrowings, classified as financing activities | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                5,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Repayments of borrowings, classified as financing activities | 
                                                5,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                225,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Payments of lease liabilities, classified as financing activities | 
                                                779,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                527,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Dividends paid, classified as financing activities | 
                                                110,715
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                64,584
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) financing activities | 
                                                124,040
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                301,500
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | 
                                                9,816
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                73,315
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                22,088
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                31,904
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                105,219
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |