Statement Of Comprehensive Income [Abstract]

Johnson Matthey PLC - Filing #2043542

Concept	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	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
Statement of comprehensive income [abstract]
Profit (loss)	– GBP	108,000,000 GBP	– GBP	– GBP	– GBP	108,000,000 GBP	276,000,000 GBP	– GBP	276,000,000 GBP	– GBP	– GBP	– GBP
Other comprehensive income [abstract]
Other comprehensive income that will not be reclassified to profit or loss, net of tax	—	57,000,000 GBP	—	—	—	—	124,000,000 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	79,000,000 GBP	79,000,000 GBP	– GBP	– GBP	– GBP	– GBP	1,000,000 GBP	– GBP	– GBP	1,000,000 GBP	– GBP	– GBP
Cash flow hedges [abstract]
Other comprehensive income, net of tax, cash flow hedges	1,000,000 GBP	1,000,000 GBP	– GBP	– GBP	– GBP	– GBP	114,000,000 GBP	– GBP	– GBP	114,000,000 GBP	– GBP	– GBP
Hedges of net investment in foreign operations [abstract]
Other comprehensive income, net of tax, hedges of net investments in foreign operations	4,000,000 GBP	4,000,000 GBP	– GBP	– GBP	– GBP	– GBP	10,000,000 GBP	– GBP	– GBP	10,000,000 GBP	– GBP	– GBP
Other comprehensive income that will be reclassified to profit or loss, net of tax	—	75,000,000 GBP	—	—	—	—	77,000,000 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	229,000,000 GBP	– GBP	164,000,000 GBP	65,000,000 GBP	– GBP	– GBP