Statement Of Changes In Equity [Abstract]
| Concept |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
2022-05-02 to 2023-04-30 |
As at 2023-04-30 |
2022-05-02 to 2023-04-30 |
2022-05-02 to 2023-04-30 |
2022-05-02 to 2023-04-30 |
2022-05-02 to 2023-04-30 |
2022-05-02 to 2023-04-30 |
2022-05-02 to 2023-04-30 |
2021-05-03 to 2022-05-01 |
2021-05-03 to 2022-05-01 |
2021-05-03 to 2022-05-01 |
2021-05-03 to 2022-05-01 |
As at 2022-05-01 |
As at 2022-05-01 |
As at 2022-05-01 |
As at 2022-05-01 |
As at 2022-05-01 |
As at 2022-05-01 |
As at 2022-05-01 |
2021-05-03 to 2022-05-01 |
2021-05-03 to 2022-05-01 |
2021-05-03 to 2022-05-01 |
As at 2021-05-02 |
As at 2021-05-02 |
As at 2021-05-02 |
As at 2021-05-02 |
As at 2021-05-02 |
As at 2021-05-02 |
As at 2021-05-02 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity |
147,100,000
GBP
|
469,300,000
GBP
|
337,000,000
GBP
|
2,800,000
GBP
|
3,000,000
GBP
|
2,200,000
GBP
|
— |
18,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
3,000,000
GBP
|
2,200,000
GBP
|
147,100,000
GBP
|
6,700,000
GBP
|
214,300,000
GBP
|
5,800,000
GBP
|
361,300,000
GBP
|
— | — | — |
2,200,000
GBP
|
147,100,000
GBP
|
–
GBP
|
4,000,000
GBP
|
3,000,000
GBP
|
106,400,000
GBP
|
250,300,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — |
121,800,000
GBP
|
— |
–
GBP
|
–
GBP
|
121,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
101,000,000
GBP
|
— | — | — | — | — | — | — |
101,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — |
2,800,000
GBP
|
— |
–
GBP
|
–
GBP
|
200,000
GBP
|
–
GBP
|
–
GBP
|
3,000,000
GBP
|
–
GBP
|
–
GBP
|
9,800,000
GBP
|
11,000,000
GBP
|
— | — | — | — | — | — | — |
1,200,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — |
119,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
122,000,000
GBP
|
–
GBP
|
–
GBP
|
3,000,000
GBP
|
–
GBP
|
–
GBP
|
9,800,000
GBP
|
112,000,000
GBP
|
— | — | — | — | — | — | — |
102,200,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — | — |
3,500,000
GBP
|
— |
–
GBP
|
–
GBP
|
3,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3,200,000
GBP
|
— | — | — | — | — | — | — |
3,200,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |