Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||||||
| Property, plant and equipment [abstract] | ||||||||
| Property, plant and equipment |
120,687,000
EUR
|
— |
111,491,000
EUR
|
— | — | — | — | — |
| Intangible assets and goodwill [abstract] | ||||||||
| Intangible assets other than goodwill [abstract] | ||||||||
| Intangible assets other than goodwill |
70,094,000
EUR
|
— |
77,357,000
EUR
|
— | — | — | — | — |
| Goodwill |
62,409,000
EUR
|
— |
63,218,000
EUR
|
— | — | — | — | — |
| Investment property [abstract] | ||||||||
| Investment property |
0
EUR
|
— |
113,000
EUR
|
— | — | — | — | — |
| Trade and other non-current receivables [abstract] | ||||||||
| Trade and other non-current receivables |
17,534,000
EUR
|
— |
15,477,000
EUR
|
— | — | — | — | — |
| Trade and other current receivables [abstract] | ||||||||
| Current trade receivables |
78,135,000
EUR
|
— |
67,716,000
EUR
|
— | — | — | — | — |
| Classes of current inventories [abstract] | ||||||||
| Current inventories |
43,692,000
EUR
|
— |
57,346,000
EUR
|
— | — | — | — | — |
| Classes of current inventories, alternative [abstract] | ||||||||
| Cash and cash equivalents [abstract] | ||||||||
| Cash and cash equivalents |
191,393,000
EUR
|
191,393,000
EUR
|
39,782,000
EUR
|
25,431,000
EUR
|
65,213,000
EUR
|
84,519,000
EUR
|
41,200,000
EUR
|
125,719,000
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
|
— |
544,236,000
EUR
|
— | — | — | — | — |
| Classes of other provisions [abstract] | ||||||||
| Other provisions [abstract] | ||||||||
| Other non-current provisions |
31,148,000
EUR
|
— |
17,992,000
EUR
|
— | — | — | — | — |
| Other current provisions |
0
EUR
|
— |
256,000
EUR
|
— | — | — | — | — |
| Trade and other non-current payables [abstract] | ||||||||
| Other non-current payables |
982,000
EUR
|
— |
1,016,000
EUR
|
— | — | — | — | — |
| Trade and other current payables [abstract] | ||||||||
| Current trade payables |
70,068,000
EUR
|
— |
75,638,000
EUR
|
— | — | — | — | — |
| Current accruals and current deferred income including current contract liabilities [abstract] | ||||||||
| Current deferred income including current contract liabilities [abstract] | ||||||||
| Current contract liabilities [abstract] | ||||||||
| Current contract liabilities |
8,037,000
EUR
|
— |
7,587,000
EUR
|
— | — | — | — | — |
| Other current payables |
44,955,000
EUR
|
— |
29,964,000
EUR
|
— | — | — | — | — |
| Categories of non-current financial liabilities [abstract] | ||||||||
| Non-current financial liabilities |
23,082,000
EUR
|
— |
196,763,000
EUR
|
— | — | — | — | — |
| Categories of current financial liabilities [abstract] | ||||||||
| Current financial liabilities |
6,415,000
EUR
|
— |
93,824,000
EUR
|
— | — | — | — | — |
| Issued capital [abstract] | ||||||||
| Issued capital |
140,577,000
EUR
|
— |
140,521,000
EUR
|
— | — | — | — | — |
| Retained earnings [abstract] | ||||||||
| Retained earnings |
160,974,000
EUR
|
— |
124,233,000
EUR
|
— | — | — | — | — |
| Net assets (liabilities) [abstract] | ||||||||
| Assets |
659,954,000
EUR
|
— |
1,074,878,000
EUR
|
— | — | — | — | — |
| Net current assets (liabilities) [abstract] | ||||||||
| Current assets |
339,907,000
EUR
|
— |
746,452,000
EUR
|
— | — | — | — | — |
| Current liabilities |
131,256,000
EUR
|
— |
378,042,000
EUR
|
— | — | — | — | — |
| Assets less current liabilities [abstract] |