Statement Of Changes In Equity [Abstract]

3i Group PLC - Filing #5976544

Concept	As at 2025-03-31	2024-04-01 to 2025-03-31	As at 2025-03-31	2024-04-01 to 2025-03-31	As at 2025-03-31	As at 2025-03-31	As at 2025-03-31	2024-04-01 to 2025-03-31	As at 2025-03-31	2024-04-01 to 2025-03-31	As at 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	As at 2025-03-31	As at 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	As at 2024-03-31	2023-04-01 to 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	2023-04-01 to 2024-03-31	As at 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	35,000,000 GBP	—	24,611,000,000 GBP	—	43,000,000 GBP	792,000,000 GBP	81,000,000 GBP	—	719,000,000 GBP	—	1,845,000,000 GBP	—	—	—	1,000,000 GBP	21,257,000,000 GBP	—	—	42,000,000 GBP	—	1,519,000,000 GBP	791,000,000 GBP	719,000,000 GBP	92,000,000 GBP	43,000,000 GBP	—	20,170,000,000 GBP	—	—	—	—	—	—	—	6,000,000 GBP	17,154,000,000 GBP	31,000,000 GBP	16,844,000,000 GBP	790,000,000 GBP	719,000,000 GBP	108,000,000 GBP	43,000,000 GBP	1,327,000,000 GBP	14,044,000,000 GBP	2,000,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	– GBP	—	5,038,000,000 GBP	—	—	—	503,000,000 GBP	—	– GBP	—	– GBP	– GBP	– GBP	—	—	– GBP	4,535,000,000 GBP	—	– GBP	—	—	—	—	—	3,836,000,000 GBP	—	– GBP	– GBP	– GBP	– GBP	527,000,000 GBP	– GBP	3,309,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	—	—	11,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	3,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	—	– GBP	—	5,049,000,000 GBP	—	—	—	503,000,000 GBP	—	– GBP	—	– GBP	– GBP	– GBP	—	—	7,000,000 GBP	4,539,000,000 GBP	—	– GBP	—	—	—	—	—	3,839,000,000 GBP	—	– GBP	– GBP	– GBP	– GBP	527,000,000 GBP	4,000,000 GBP	3,316,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Issue of equity	—	– GBP	—	1,000,000 GBP	—	—	—	– GBP	—	– GBP	—	– GBP	– GBP	1,000,000 GBP	—	—	– GBP	– GBP	—	– GBP	—	—	—	—	—	1,000,000 GBP	—	1,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	– GBP	—	625,000,000 GBP	—	—	—	200,000,000 GBP	—	– GBP	—	– GBP	– GBP	– GBP	—	—	– GBP	425,000,000 GBP	—	– GBP	—	—	—	—	—	541,000,000 GBP	—	– GBP	– GBP	– GBP	– GBP	351,000,000 GBP	– GBP	190,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	16,000,000 GBP	—	16,000,000 GBP	—	—	—	– GBP	—	– GBP	—	– GBP	– GBP	– GBP	—	—	– GBP	– GBP	—	27,000,000 GBP	—	—	—	—	—	27,000,000 GBP	—	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—