Statement Of Changes In Equity [Abstract]

Stef Group - Filing #2821459

Concept	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	As at 2020-12-31	2020-01-01 to 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	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	2019-01-01 to 2019-12-31	2019-01-01 to 2019-12-31	As at 2018-12-31	As at 2018-12-31	As at 2018-12-31	As at 2018-12-31	As at 2018-12-31	As at 2018-12-31	As at 2018-12-31	As at 2018-12-31	As at 2018-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	846 046 EUR	863,000 EUR	3 585 EUR	816 914 EUR	—	13 000 EUR	—	—	38 923 EUR	375,000 EUR	0 EUR	—	817 776 EUR	—	—	—	—	759 266 EUR	—	1 478 EUR	—	256,000 EUR	—	—	0 EUR	760 743 EUR	789 631 EUR	—	39 454 EUR	4 167 EUR	—	13 000 EUR	—	—	—	738,000 EUR	0 EUR	1 894 EUR	40 538 EUR	693 140 EUR	695 034 EUR	4 122 EUR	13 166 EUR	725 372 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	72 361 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	100 161 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	74 161 EUR	—	—	—	—	0 EUR	—	73 861 EUR	582,000 EUR	—	—	—	0 EUR	—	119,000 EUR	402,000 EUR	0 EUR	74 563 EUR	—	994,000 EUR	—	94 546 EUR	—	93 597 EUR	171,000 EUR	—	—	—	94 375 EUR	—	—	45,000 EUR	—	0 EUR	0 EUR	0 EUR	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	18 563 EUR	—	—	—	—	—	—	18 563 EUR	—	—	—	—	—	—	—	0 EUR	—	18 563 EUR	—	—	—	30 870 EUR	—	30 870 EUR	71,000 EUR	—	—	—	30 941 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through treasury share transactions, equity	617,000 EUR	—	—	—	—	617,000 EUR	—	—	—	—	—	—	—	—	—	—	—	617,000 EUR	—	—	—	918,000 EUR	—	—	—	—	—	—	918,000 EUR	—	—	—	—	—	—	918,000 EUR	—	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	272,000 EUR	—	—	—	—	—	—	46,000 EUR	—	—	—	—	—	—	—	226,000 EUR	—	46,000 EUR	—	—	—	0 EUR	—	0 EUR	174,000 EUR	—	—	—	174,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	1 090 EUR	—	—	—	—	86,000 EUR	—	1 163 EUR	—	—	—	—	0 EUR	—	—	13,000 EUR	—	1 077 EUR	—	—	—	1 532 EUR	—	1 532 EUR	—	—	—	—	1 532 EUR	—	—	—	—	166,000 EUR	—	166,000 EUR	—	—	—	—	—	—	—	—	—