Statement Of Financial Position [Abstract]

Grainger PLC - Filing #1958617

Concept	As at 2023-09-30	As at 2023-09-30	As at 2023-09-30	As at 2023-09-30	As at 2023-09-30	As at 2023-09-30	As at 2023-09-30	As at 2022-09-30	As at 2022-09-30	As at 2022-09-30	As at 2022-09-30	As at 2022-09-30	As at 2022-09-30	As at 2022-09-30	As at 2021-09-30	As at 2021-09-30	As at 2021-09-30	As at 2021-09-30	As at 2021-09-30	As at 2021-09-30	As at 2021-09-30
Statement of financial position [abstract]
Assets [abstract]
Non-current assets [abstract]
Property, plant and equipment	—	—	—	—	—	8,600,000 GBP	—	—	—	—	4,200,000 GBP	—	—	—	—	—	—	—	—	—	—
Investment property	—	—	—	—	—	2,948,900,000 GBP	—	—	—	—	2,775,900,000 GBP	—	—	—	—	—	—	—	—	—	—
Deferred tax assets	—	—	—	—	—	3,700,000 GBP	—	—	—	—	1,200,000 GBP	—	—	—	—	—	—	—	—	—	—
Non-current assets	—	—	—	—	—	3,129,800,000 GBP	—	—	—	—	2,915,900,000 GBP	—	—	—	—	—	—	—	—	—	—
Current assets [abstract]
Current inventories	—	—	—	—	—	392,200,000 GBP	—	—	—	—	453,800,000 GBP	—	—	—	—	—	—	—	—	—	—
Trade and other current receivables	—	—	—	—	—	34,000,000 GBP	—	—	—	—	40,500,000 GBP	—	—	—	—	—	—	—	—	—	—
Cash and cash equivalents	—	—	—	—	—	121,000,000 GBP	—	—	—	—	95,900,000 GBP	—	—	—	—	—	—	—	317,600,000 GBP	—	—
Current assets	—	—	—	—	—	592,500,000 GBP	—	—	—	—	663,200,000 GBP	—	—	—	—	—	—	—	—	—	—
Assets	—	—	—	—	—	3,722,300,000 GBP	—	—	—	—	3,579,100,000 GBP	—	—	—	—	—	—	—	—	—	—
Equity and liabilities [abstract]
Equity [abstract]
Issued capital	—	—	—	—	—	37,200,000 GBP	—	—	—	—	37,100,000 GBP	—	—	—	—	—	—	—	—	—	—
Retained earnings	—	—	—	—	—	1,033,200,000 GBP	—	—	—	—	1,059,600,000 GBP	—	—	—	—	—	—	—	—	—	—
Share premium	—	—	—	—	—	817,800,000 GBP	—	—	—	—	817,600,000 GBP	—	—	—	—	—	—	—	—	—	—
Equity	20,000,000 GBP	20,100,000 GBP	1,033,200,000 GBP	817,800,000 GBP	37,200,000 GBP	1,928,600,000 GBP	300,000 GBP	32,100,000 GBP	20,100,000 GBP	817,600,000 GBP	1,966,800,000 GBP	1,059,600,000 GBP	37,100,000 GBP	300,000 GBP	3,300,000 GBP	20,100,000 GBP	300,000 GBP	867,500,000 GBP	1,739,000,000 GBP	37,100,000 GBP	817,300,000 GBP
Liabilities [abstract]
Non-current liabilities [abstract]
Non-current provisions [abstract]
Non-current provisions	—	—	—	—	—	1,100,000 GBP	—	—	—	—	1,100,000 GBP	—	—	—	—	—	—	—	—	—	—
Trade and other non-current payables	—	—	—	—	—	6,900,000 GBP	—	—	—	—	2,200,000 GBP	—	—	—	—	—	—	—	—	—	—
Deferred tax liabilities	—	—	—	—	—	122,300,000 GBP	—	—	—	—	136,900,000 GBP	—	—	—	—	—	—	—	—	—	—
Non-current liabilities	—	—	—	—	—	1,663,800,000 GBP	—	—	—	—	1,457,800,000 GBP	—	—	—	—	—	—	—	—	—	—
Current liabilities [abstract]
Current provisions [abstract]
Current provisions	—	—	—	—	—	8,600,000 GBP	—	—	—	—	8,600,000 GBP	—	—	—	—	—	—	—	—	—	—
Trade and other current payables	—	—	—	—	—	120,700,000 GBP	—	—	—	—	105,900,000 GBP	—	—	—	—	—	—	—	—	—	—
Current liabilities	—	—	—	—	—	129,900,000 GBP	—	—	—	—	154,500,000 GBP	—	—	—	—	—	—	—	—	—	—
Liabilities	—	—	—	—	—	1,793,700,000 GBP	—	—	—	—	1,612,300,000 GBP	—	—	—	—	—	—	—	—	—	—