Statement Of Financial Position [Abstract]
| Concept |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment | — |
31,700,000
GBP
|
— | — | — | — | — | — | — |
34,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — |
4,900,000
GBP
|
— | — | — | — | — | — | — |
9,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Deferred tax assets | — |
1,700,000
GBP
|
— | — | — | — | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — | — |
| Other non-current financial assets | — |
38,600,000
GBP
|
— | — | — | — | — | — | — |
20,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Non-current assets | — |
79,400,000
GBP
|
— | — | — | — | — | — | — |
71,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Current inventories | — |
4,575,600,000
GBP
|
— | — | — | — | — | — | — |
4,423,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Trade and other current receivables | — |
88,300,000
GBP
|
— | — | — | — | — | — | — |
114,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash and cash equivalents | — |
362,000,000
GBP
|
— | — | — | — | — | — | — |
375,300,000
GBP
|
— | — | — | — | — | — | — |
460,300,000
GBP
|
| Current assets | — |
5,034,700,000
GBP
|
— | — | — | — | — | — | — |
4,913,500,000
GBP
|
— | — | — | — | — | — | — | — |
| Assets | — |
5,114,100,000
GBP
|
— | — | — | — | — | — | — |
4,985,100,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital | — |
15,000,000
GBP
|
— | — | — | — | — | — | — |
15,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Retained earnings | — |
3,242,700,000
GBP
|
— | — | — | — | — | — | — |
3,148,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Share premium | — |
182,000,000
GBP
|
— | — | — | — | — | — | — |
182,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Other reserves | — |
1,500,000
GBP
|
— | — | — | — | — | — | — |
1,500,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity |
182,000,000
GBP
|
3,461,600,000
GBP
|
15,000,000
GBP
|
3,242,700,000
GBP
|
20,400,000
GBP
|
1,500,000
GBP
|
182,000,000
GBP
|
15,400,000
GBP
|
3,148,900,000
GBP
|
3,367,800,000
GBP
|
20,000,000
GBP
|
1,500,000
GBP
|
1,500,000
GBP
|
15,400,000
GBP
|
20,000,000
GBP
|
3,071,100,000
GBP
|
179,800,000
GBP
|
3,287,800,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||
| Non-current provisions | — |
403,500,000
GBP
|
— | — | — | — | — | — | — |
400,800,000
GBP
|
— | — | — | — | — | — | — | — |
| Trade and other non-current payables | — |
107,300,000
GBP
|
— | — | — | — | — | — | — |
106,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Deferred tax liabilities | — |
6,200,000
GBP
|
— | — | — | — | — | — | — |
8,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Non-current liabilities | — |
647,000,000
GBP
|
— | — | — | — | — | — | — |
646,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||
| Current provisions | — |
104,700,000
GBP
|
— | — | — | — | — | — | — |
40,700,000
GBP
|
— | — | — | — | — | — | — | — |
| Trade and other current payables | — |
900,800,000
GBP
|
— | — | — | — | — | — | — |
930,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Current liabilities | — |
1,005,500,000
GBP
|
— | — | — | — | — | — | — |
971,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Liabilities | — |
1,652,500,000
GBP
|
— | — | — | — | — | — | — |
1,617,300,000
GBP
|
— | — | — | — | — | — | — | — |