Statement Of Changes In Equity [Abstract]

CMC Markets PLC - Filing #3480029

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	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 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	— GBP	— GBP	— GBP	— GBP	1,1 64 GBP	1,1 64 GBP	— GBP
Purchase of treasury shares	1,0 06 GBP	— GBP	— GBP	— GBP	— GBP	1,0 06 GBP	— GBP	— GBP	— GBP	— GBP	— GBP	— GBP	3 64 GBP	36 4 GBP
Sale or issue of treasury shares	294,000 GBP	— GBP	— GBP	— GBP	— GBP	294,000 GBP	— GBP	— GBP	— GBP	— GBP	— GBP	— GBP	415,000 GBP	415,000 GBP