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 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 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 |
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 | — | — | — | — | — | — | — | — |
357,100,000
GBP
|
— | — |
322,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — | — | — | — | — |
10,800,000
GBP
|
— | — |
32,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||
| Cash and cash equivalents | — | — | — | — | — | — | — | — |
2,209,300,000
GBP
|
— | — |
1,383,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,436,600,000
GBP
|
— | — | — | — | — |
| Assets | — | — | — | — | — | — | — | — |
13,550,300,000
GBP
|
— | — |
12,678,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital | — | — | — | — | — | — | — | — |
38,000,000
GBP
|
— | — |
38,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — | — | — |
1,608,500,000
GBP
|
— | — |
1,628,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — | — | — | — | — |
1,600,000
GBP
|
— | — |
8,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — | — | — | — | — | — |
1,644,900,000
GBP
|
— | — |
1,657,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
38,000,000
GBP
|
1,608,500,000
GBP
|
2,700,000
GBP
|
32,000,000
GBP
|
34,400,000
GBP
|
1,300,000
GBP
|
1,644,900,000
GBP
|
–
GBP
|
1,644,900,000
GBP
|
38,000,000
GBP
|
1,628,400,000
GBP
|
1,657,500,000
GBP
|
1,500,000
GBP
|
21,700,000
GBP
|
29,200,000
GBP
|
100,000
GBP
|
1,657,500,000
GBP
|
–
GBP
|
800,000
GBP
|
1,300,000
GBP
|
22,400,000
GBP
|
1,569,300,000
GBP
|
1,000,000
GBP
|
1,570,300,000
GBP
|
300,000
GBP
|
38,000,000
GBP
|
1,555,500,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Liabilities | — | — | — | — | — | — | — | — |
11,905,400,000
GBP
|
— | — |
11,020,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — | — | — | — | — | — |
13,550,300,000
GBP
|
— | — |
12,678,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |