Profit Or Loss [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
Profit or loss [abstract]
Profit (loss) [abstract]
Revenue	—	—	—	—	267,100,000 GBP	—	—	279,200,000 GBP	—	—	—	—	—	—
Profit (loss) from operating activities	—	—	—	—	128,400,000 GBP	—	—	122,200,000 GBP	—	—	—	—	—	—
Finance income	—	—	—	—	2,200,000 GBP	—	—	1,300,000 GBP	—	—	—	—	—	—
Finance costs	—	—	—	—	34,000,000 GBP	—	—	34,600,000 GBP	—	—	—	—	—	—
Profit (loss) before tax	—	—	—	—	27,400,000 GBP	—	—	298,600,000 GBP	—	—	—	—	—	—
Tax expense (income)	—	—	—	—	1,800,000 GBP	—	—	69,200,000 GBP	—	—	—	—	—	—
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
Profit (loss), attributable to [abstract]
Profit (loss), attributable to owners of parent	—	—	—	—	25,600,000 GBP	—	—	229,400,000 GBP	—	—	—	—	—	—
Earnings per share [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Earnings per share [abstract]
Earnings per share [line items]
Basic earnings per share [abstract]
Basic earnings (loss) per share	—	—	—	—	0.035	—	—	0.310	—	—	—	—	—	—
Diluted earnings per share [abstract]
Diluted earnings (loss) per share	—	—	—	—	0.035	—	—	0.309	—	—	—	—	—	—