Statement Of Changes In Equity [Abstract]

Johnson Matthey PLC - Filing #2043542

Concept	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	2022-04-01 to 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	As at 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	As at 2023-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	36,000,000 GBP	1,998,000,000 GBP	148,000,000 GBP	215,000,000 GBP	17,000,000 GBP	—	2,380,000,000 GBP	—	—	—	—	—	2,539,000,000 GBP	148,000,000 GBP	215,000,000 GBP	19,000,000 GBP	—	—	—	2,077,000,000 GBP	—	—	118,000,000 GBP	50,000,000 GBP	24,000,000 GBP	218,000,000 GBP	148,000,000 GBP	2,049,000,000 GBP	2,441,000,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	– GBP	—	—	—	—	—	108,000,000 GBP	—	– GBP	– GBP	– GBP	108,000,000 GBP	– GBP	—	—	—	—	– GBP	276,000,000 GBP	– GBP	—	– GBP	276,000,000 GBP	—	—	—	—	—	—	—
Other comprehensive income	—	—	—	—	—	—	132,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	47,000,000 GBP	—	—	—	—	—	—	—
Comprehensive income	82,000,000 GBP	—	—	—	—	—	24,000,000 GBP	—	– GBP	– GBP	– GBP	58,000,000 GBP	– GBP	—	—	—	—	– GBP	164,000,000 GBP	– GBP	—	65,000,000 GBP	229,000,000 GBP	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	– GBP	—	—	—	—	—	141,000,000 GBP	—	– GBP	– GBP	– GBP	141,000,000 GBP	– GBP	—	—	—	—	– GBP	141,000,000 GBP	– GBP	—	– GBP	141,000,000 GBP	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	– GBP	—	—	—	—	—	17,000,000 GBP	—	– GBP	– GBP	– GBP	17,000,000 GBP	– GBP	—	—	—	—	– GBP	18,000,000 GBP	– GBP	—	– GBP	18,000,000 GBP	—	—	—	—	—	—	—