Statement Of Changes In Equity [Abstract]

WithSecure Oyj - Filing #3037678

Concept	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	As at 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	As at 2024-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 2023-12-31	As at 2023-12-31	2023-01-01 to 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 2022-12-31	As at 2022-12-31	As at 2022-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	—	15 575 EUR	—	80,000 EUR	1 244 EUR	155,000 EUR	—	—	—	83 638 EUR	69 233 EUR	—	—	102 980 EUR	20 222 EUR	—	—	—	80,000 EUR	805,000 EUR	155,000 EUR	—	83 638 EUR	140 089 EUR	58 649 EUR	155,000 EUR	80,000 EUR	2 124 EUR	83 638 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	—	—	—	—	—	—	—	37 979 EUR	—	—	—	40 030 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	0 EUR	0 EUR	—	2 049 EUR	—	—	—	37 979 EUR	35 931 EUR	0 EUR	—	—	38 712 EUR	0 EUR	—	—	40 030 EUR	1 319 EUR	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	0 EUR	0 EUR	—	0 EUR	—	—	—	2 183 EUR	2 183 EUR	0 EUR	—	—	1 603 EUR	0 EUR	—	—	1 603 EUR	0 EUR	0 EUR	—	—	—	0 EUR	—	—	—	—	—	—	—