Statement Of Changes In Equity [Abstract]

CMC Markets PLC - Filing #3479907

Concept	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	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
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Decrease (increase) through tax on share-based payment transactions, equity	—	—	—	—	—	—	—	— GBP	— GBP	553,000 GBP	— GBP	— GBP	553,000 GBP	— GBP
Purchase of treasury shares	1 ,1 0 6 GBP	— GBP	— GBP	— GBP	— GBP	— GBP	1 ,1 0 6 GBP	1,006,000 GBP	— GBP	— GBP	— GBP	— GBP	1, 006 GBP	— GBP
Sale or issue of treasury shares	691,000 GBP	— GBP	— GBP	— GBP	— GBP	— GBP	691,000 GBP	294,000 GBP	— GBP	— GBP	— GBP	— GBP	294,000 GBP	— GBP