Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept | As at 2024-08-31 | As at 2023-08-31 | As at 2022-08-31 | 
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill | 
                                                3 000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                3 000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Investment property [abstract] | |||
| Investment property | 
                                                560 050
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                694 970
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Miscellaneous non-current assets [abstract] | |||
| Other non-current assets | 
                                                1 824
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                3 223
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Trade and other current receivables [abstract] | |||
| Current trade receivables | 
                                                14 359
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                17 574
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Current prepayments and current accrued income other than current contract assets [abstract] | |||
| Current prepayments [abstract] | |||
| Current prepayments | 
                                                789,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                588,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Other current receivables | 
                                                7 115
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                7 007
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Current prepayments and current accrued income including current contract assets [abstract] | |||
| Categories of non-current financial assets [abstract] | |||
| Non-current financial assets | 
                                                1 824
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                3 223
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash and cash equivalents [abstract] | |||
| Cash [abstract] | |||
| Cash | 
                                                5 138
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                6 351
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                397,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                5 138
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                6 351
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| Non-current assets or disposal groups classified as held for sale | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2 364
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Non-current portion of non-current loans received | 
                                                226 296
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                279 281
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Non-current portion of non-current bonds issued | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Non-current portion of other non-current borrowings | 
                                                70 001
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                81 307
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Current borrowings and current portion of non-current borrowings, by type [abstract] | |||
| Current loans received and current portion of non-current loans received | 
                                                12 893
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                4 745
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Current bonds issued and current portion of non-current bonds issued | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Other current borrowings and current portion of other non-current borrowings | 
                                                4 052
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                4 977
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Categories of non-current financial liabilities [abstract] | |||
| Non-current financial liabilities | 
                                                296 297
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                360 588
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Categories of current financial liabilities [abstract] | |||
| Current financial liabilities | 
                                                18 862
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                49 782
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current deposits from customers | 
                                                5 165
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                6 026
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities | 
                                                852,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Issued capital [abstract] | |||
| Issued capital | 
                                                20 787
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                20 787
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Retained earnings [abstract] | |||
| Retained earnings, profit (loss) for reporting period | 
                                                41 338
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                26 009
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Retained earnings, excluding profit (loss) for reporting period | 
                                                279 804
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                305 813
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Net assets (liabilities) [abstract] | |||
| Assets | 
                                                592 276
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                735 078
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Net current assets (liabilities) [abstract] | |||
| Current assets | 
                                                27 402
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                33 884
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Current liabilities | 
                                                31 552
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                67 864
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Assets less current liabilities [abstract] |