Statement Of Changes In Equity [Abstract]

Alten - Filing #2816643

Concept	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Increase (decrease) through appropriation of retained earnings, equity	0 EUR	—	0 EUR	224,000 EUR	224,000 EUR	98 011 EUR	—	98 011 EUR	—	—	—	164 225 EUR	656,000 EUR	656,000 EUR	164 225 EUR	—	—	0 EUR	—	0 EUR
Increase (decrease) through transactions with owners, equity	—	341,000 EUR	16 122 EUR	—	—	81 402 EUR	0 EUR	98 011 EUR	0 EUR	146,000 EUR	356,000 EUR	171 190 EUR	—	—	164 225 EUR	89,000 EUR	0 EUR	—	0 EUR	6 698 EUR