Statement Of Changes In Equity [Abstract]
| Concept |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
2021-05-01 to 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 |
As at 2022-04-30 |
2021-05-01 to 2022-04-30 |
As at 2022-04-30 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-04-30 |
2020-05-01 to 2021-04-30 |
As at 2021-04-30 |
2020-05-01 to 2021-04-30 |
As at 2021-04-30 |
2020-05-01 to 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
2020-05-01 to 2021-04-30 |
2020-05-01 to 2021-04-30 |
2020-05-01 to 2021-04-30 |
As at 2020-05-01 |
As at 2020-05-01 |
As at 2020-05-01 |
As at 2020-05-01 |
As at 2020-05-01 |
As at 2020-05-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity |
4,016. 1
GBP
|
49,800,000
GBP
|
6,500,000
GBP
|
— |
25,000,000
GBP
|
— | — | — | — |
3, 136. 1
GBP
|
— |
961,300,000
GBP
|
6,600,000
GBP
|
49,800,000
GBP
|
24,900,000
GBP
|
961,300,000
GBP
|
3, 175.4
GBP
|
4,055,400,000
GBP
|
961,300,000
GBP
|
— |
3, 175.4
GBP
|
— |
2 4.9
GBP
|
— |
49,800,000
GBP
|
4,055,400,000
GBP
|
6,600,000
GBP
|
— | — | — |
3,981,600,000
GBP
|
3, 101.6
GBP
|
961,300,000
GBP
|
6,800,000
GBP
|
24. 7
GBP
|
49,800,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — |
–
GBP
|
— |
482,400,000
GBP
|
–
GBP
|
–
GBP
|
482,400,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
— |
–
GBP
|
— |
422. 7
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
422,700,000
GBP
|
— | — | — | — | — | — |
| Other comprehensive income | — | — | — |
–
GBP
|
— |
1,600,000
GBP
|
–
GBP
|
–
GBP
|
1,600,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
— |
–
GBP
|
— |
2,700,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
2,700,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — | — | — |
480,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
425,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
–
GBP
|
— |
145,500,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
145,500,000
GBP
|
— | — | — | — | — | — |
| Decrease through other distributions to owners, equity | — | — | — |
–
GBP
|
— |
451,500,000
GBP
|
–
GBP
|
–
GBP
|
451,500,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |