Disclosure Of Income Tax [Text Block]

Johnson Matthey PLC - Filing #2043544

Concept	2023-04-01 to 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	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	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31
Disclosure of income tax [text block]	—		—	—	—	—	—	—	—	—	—	—	—	—
Major components of tax expense (income) [abstract]
Tax expense (income)	—	56,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	80,000,000 GBP
Income tax relating to components of other comprehensive income [abstract]
Income tax relating to components of other comprehensive income	1,000,000 GBP	1 9 GBP	—	– GBP	– GBP	– GBP	18,000,000 GBP	– GBP	– GBP	—	28,000,000 GBP	37,000,000 GBP	– GBP	9,000,000 GBP
Disclosure of temporary difference, unused tax losses and unused tax credits [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets and liabilities [abstract]
Deferred tax assets	—	—	128,000,000 GBP	—	—	—	—	—	—	121,000,000 GBP	—	—	—	—
Deferred tax liabilities	—	—	2,000,000 GBP	—	—	—	—	—	—	19,000,000 GBP	—	—	—	—
Reconciliation of changes in deferred tax liability (asset) [abstract]
Changes in deferred tax liability (asset) [abstract]
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]