Statement Of Cash Flows [Abstract]
| Concept | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2022-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||||||
| Profit (loss) | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                23,371
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                23,371
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                23,371
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,246
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,246
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                1,246
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||||||
| Adjustments for decrease (increase) in trade accounts receivable | — | — | — | — | — | — | — | — | — | 
                                                15,225
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                10,444
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Adjustments for increase (decrease) in trade accounts payable | — | — | — | — | — | — | — | — | — | 
                                                3,582
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                4,181
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Adjustments for depreciation and amortisation expense | — | — | — | — | — | — | — | — | — | 
                                                23,837
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                7,774
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Adjustments for provisions | — | — | — | — | — | — | — | — | — | 
                                                3,629
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                69,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Other adjustments for non-cash items | — | — | — | — | — | — | — | — | — | 
                                                2,511
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                561,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Adjustments for losses (gains) on disposal of non-current assets | — | — | — | — | — | — | — | — | — | 
                                                307,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                1,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Dividends paid, classified as operating activities | — | — | — | — | — | — | — | — | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                3,741
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Interest received, classified as operating activities | — | — | — | — | — | — | — | — | — | 
                                                20,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                26,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — | — | — | — | — | 
                                                2,955
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                5,320
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) operating activities | — | — | — | — | — | — | — | — | — | 
                                                8,895
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                9,245
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — | — | — | — | — | 
                                                106,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                325,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Purchase of intangible assets, classified as investing activities | — | — | — | — | — | — | — | — | — | 
                                                3,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                71,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) investing activities | — | — | — | — | — | — | — | — | — | 
                                                1,286
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                7,495
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||
| Proceeds from issuing shares | — | — | — | — | — | — | — | — | — | 
                                                4,302
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Proceeds from borrowings, classified as financing activities | — | — | — | — | — | — | — | — | — | 
                                                30,300
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                30,341
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Repayments of borrowings, classified as financing activities | — | — | — | — | — | — | — | — | — | 
                                                29,589
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                21,065
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — | — | — | — | — | 
                                                5,198
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                5,042
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) financing activities | — | — | — | — | — | — | — | — | — | 
                                                2,429
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                908,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — | — | — | — | — | — | — | — | 
                                                5,180
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                842,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                12,080
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                6,900
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                6,058
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |