Statement Of Comprehensive Income [Abstract]

3i Group PLC - Filing #1635736

Concept	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31
Statement of comprehensive income [abstract]
Profit (loss)	– GBP	3 , 5 47 GBP	– GBP	– GBP	– GBP	466,000,000 GBP	– GBP	4 , 0 13 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	14 8 GBP	1, 8 5 5 GBP	– GBP	1, 7 0 7 GBP	– GBP
Other comprehensive income [abstract]
Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract]
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	– GBP	2,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	2,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	12 6 GBP	– GBP	12 6 GBP	– GBP
Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract]
Exchange differences on translation [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations	– GBP	– GBP	– GBP	– GBP	1,000,000 GBP	– GBP	– GBP	1,000,000 GBP	– GBP	3,000,000 GBP	– GBP	– GBP	– GBP	– GBP	3,000,000 GBP	– GBP	– GBP	– GBP
Other comprehensive income	—	—	—	—	—	—	—	1,000,000 GBP	—	—	—	—	—	—	12 9 GBP	—	—	—
Comprehensive income	– GBP	3,5 49 GBP	– GBP	– GBP	1,000,000 GBP	466,000,000 GBP	– GBP	4 , 0 14 GBP	– GBP	3,000,000 GBP	– GBP	– GBP	– GBP	14 8 GBP	1,7 2 6 GBP	– GBP	1, 5 8 1 GBP	– GBP