Statement Of Changes In Equity [Abstract]
| Concept |
As at 2023-04-30 |
2022-05-01 to 2023-04-30 |
As at 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
As at 2022-04-30 |
2021-05-01 to 2022-04-30 |
As at 2022-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||
| Equity |
49,800,000
GBP
|
— |
3,332,300,000
GBP
|
— | — | — |
4,212,300,000
GBP
|
6,300,000
GBP
|
25,200,000
GBP
|
961,300,000
GBP
|
— | — |
4, 016. 1
GBP
|
49,800,000
GBP
|
25. 0
GBP
|
6,500,000
GBP
|
— | — | — | — | — |
3, 136. 1
GBP
|
— |
961,300,000
GBP
|
961,300,000
GBP
|
3,17 5.4
GBP
|
49,800,000
GBP
|
4,055,400,000
GBP
|
6,600,000
GBP
|
24,900,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) | — |
465,700,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
465,700,000
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
482,400,000
GBP
|
–
GBP
|
–
GBP
|
482,400,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income | — |
1,300,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
1,300,000
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
1,600,000
GBP
|
–
GBP
|
–
GBP
|
1,600,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income | — |
464,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
480,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
4,500,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
4,500,000
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
8,700,000
GBP
|
–
GBP
|
–
GBP
|
8,700,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |