Disclosure Of First-Time Adoption [Text Block]

Johnson Matthey PLC - Filing #1895979

Concept	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	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	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	2021-04-01 to 2022-03-31	As at 2022-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31
Disclosure of first-time adoption [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of comparative information prepared under previous GAAP [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of comparative information prepared under previous GAAP [abstract]
Disclosure of comparative information prepared under previous GAAP [line items]
Equity	—	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	29,000,000 GBP	2,345,000,000 GBP	– GBP	2,685,000,000 GBP	148,000,000 GBP	221,000,000 GBP
Comprehensive income	– GBP	—	—	—	—	– GBP	– GBP	164,000,000 GBP	—	65,000,000 GBP	229,000,000 GBP	—	– GBP	– GBP	41,000,000 GBP	47,000,000 GBP	– GBP	—	—	—	—	—	88,000,000 GBP	—	—	—	—	—	—	—
Profit (loss)	– GBP	—	—	—	—	– GBP	– GBP	276,000,000 GBP	—	– GBP	276,000,000 GBP	—	– GBP	– GBP	101,000,000 GBP	– GBP	– GBP	—	—	—	—	—	101,000,000 GBP	—	—	—	—	—	—	—