Statement Of Comprehensive Income [Abstract]

Grainger PLC - Filing #1958617

Concept	2022-10-01 to 2023-09-30	2022-10-01 to 2023-09-30	2022-10-01 to 2023-09-30	2022-10-01 to 2023-09-30	2022-10-01 to 2023-09-30	2022-10-01 to 2023-09-30	2022-10-01 to 2023-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30	2021-10-01 to 2022-09-30
Statement of comprehensive income [abstract]
Profit (loss)	– GBP	– GBP	– GBP	– GBP	25,600,000 GBP	25,600,000 GBP	– GBP	229,400,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	229,400,000 GBP
Other comprehensive income [abstract]
Other comprehensive income	– GBP	– GBP	– GBP	12,100,000 GBP	12,900,000 GBP	800,000 GBP	– GBP	39,700,000 GBP	– GBP	– GBP	– GBP	35,400,000 GBP	– GBP	4,300,000 GBP
Comprehensive income	– GBP	– GBP	– GBP	12,100,000 GBP	12,700,000 GBP	24,800,000 GBP	– GBP	269,100,000 GBP	– GBP	– GBP	– GBP	35,400,000 GBP	– GBP	233,700,000 GBP