Analysis Of Income And Expense [Abstract]

Alten - Filing #5981757

Concept	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31
Analysis of income and expense [abstract]
Material income and expense [abstract]
Other finance income	—	42 637 EUR	—	—	—	—	—	—	—	44 213 EUR	—	—	—	—	—	—
Other finance cost	—	41 696 EUR	—	—	—	—	—	—	—	46 013 EUR	—	—	—	—	—	—
Expenses by nature [abstract]
Classes of employee benefits expense [abstract]
Expense from share-based payment transactions with employees	—	20 261 EUR	—	—	—	—	—	—	—	32 282 EUR	—	—	—	—	—	—
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Depreciation and amortisation expense [abstract]
Depreciation and amortisation expense	—	94 460 EUR	—	—	—	—	—	—	—	92 040 EUR	—	—	—	—	—	—
Tax expense other than income tax expense	—	16 741 EUR	—	—	—	—	—	—	—	12 605 EUR	—	—	—	—	—	—
Other expenses, by nature	—	273 862 EUR	—	—	—	—	—	—	—	303 406 EUR	—	—	—	—	—	—
Disclosure of attribution of expenses by nature to their function [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of attribution of expenses by nature to their function [abstract]
Disclosure of attribution of expenses by nature to their function [line items]
Miscellaneous other comprehensive income [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations	—	23 195 EUR	—	—	—	—	—	—	—	14 736 EUR	—	—	—	—	—	—
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of associates accounted for using equity method	—	30,000 EUR	—	—	—	—	—	—	—	75,000 EUR	—	—	—	—	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	0 EUR	205 882 EUR	186 419 EUR	3 733 EUR	(0) EUR	0 EUR	23 195 EUR	205 882 EUR	14 736 EUR	221 129 EUR	233 205 EUR	2 660 EUR	0 EUR	0 EUR	(0) EUR	221 129 EUR
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	205 882 EUR	—	—	—	—	—	—	—	221 129 EUR	—	—	—	—	—	—
Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract]
Comprehensive income, attributable to non-controlling interests	—	0 EUR	—	—	—	—	—	—	—	0 EUR	—	—	—	—	—	—