Statement Of Changes In Equity [Abstract]

Alten - Filing #2816643

Concept	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	8 728 EUR	—	53,000 EUR	—	—	427,000 EUR	—	1 120 271 EUR	—	1 421 056 EUR	207 837 EUR	—	3,000 EUR	—	—	1 421 427 EUR	60 250 EUR	—	5 700 EUR	36 099 EUR	371,000 EUR	—	—	484,000 EUR	1 043 949 EUR	—	35 953 EUR	1 213 604 EUR	224,000 EUR	—	267,000 EUR	—	—	98 011 EUR	—	9 070 EUR	7,000 EUR	15 489 EUR	60 250 EUR	—	—	1 213 120 EUR	—	—	—	1 113 752 EUR	425,000 EUR	948,000 EUR	237,000 EUR	5,000 EUR	656,000 EUR	861 179 EUR	60 250 EUR	8 713 EUR	164 225 EUR	35 864 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	207 889 EUR	97 786 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	49,000 EUR	—	—	—	223 945 EUR	53,000 EUR	—	—	—	5 080 EUR	—	—	207 837 EUR	—	4,000 EUR	21 188 EUR	—	—	—	—	—	—	223 994 EUR	92 940 EUR	—	—	11 580 EUR	—	—	—	224,000 EUR	—	—	12,000 EUR	—	98 011 EUR	—	—	—	—	—	—	—	16 436 EUR	213,000 EUR	93 154 EUR	—	—	—	—	—	—	—	—	—	—	—
Issue of equity	0 EUR	—	—	—	0 EUR	—	—	—	—	146,000 EUR	—	—	—	—	—	—	—	—	146,000 EUR	—	—	—	—	—	—	—	89,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	89,000 EUR	—	—	0 EUR	0 EUR	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	—	—	—	33 875 EUR	—	—	—	—	33 875 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	0 EUR	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through other changes, equity	—	—	—	—	83,000 EUR	—	—	—	—	83,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	71,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	71,000 EUR	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through treasury share transactions, equity	—	—	341,000 EUR	—	341,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	356,000 EUR	—	—	—	—	356,000 EUR	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	64,000 EUR	—	—	—	—	—	—	64,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	153,000 EUR	—	—	—	—	—	—	—	—	—	—	—	153,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	—	—	—	17 494 EUR	—	—	—	—	17 494 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	6 983 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	6 983 EUR	—	—	—	—	—	—	—	—	—	—	—