Statement Of Cash Flows [Abstract]
| Concept | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||
| Cash flows from (used in) operating activities [abstract] | |||||||
| Cash flows from (used in) operations | — | 
                                                533,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                572,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Dividends received, classified as operating activities | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) operating activities | — | 
                                                533,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                572,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) investing activities [abstract] | |||||||
| Cash flows from (used in) investing activities | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                50,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) financing activities [abstract] | |||||||
| Proceeds from issuing shares | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Repayments of borrowings, classified as financing activities | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) financing activities | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | 
                                                533,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                522,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                736,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                736,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 269
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                1 791
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |