Statement Of Changes In Equity [Abstract]
| Concept |
As at 2023-06-30 |
2022-07-01 to 2023-06-30 |
2022-07-01 to 2023-06-30 |
As at 2023-06-30 |
As at 2023-06-30 |
As at 2023-06-30 |
2022-07-01 to 2023-06-30 |
2022-07-01 to 2023-06-30 |
As at 2023-06-30 |
2022-07-01 to 2023-06-30 |
2022-07-01 to 2023-06-30 |
As at 2023-06-30 |
2022-07-01 to 2023-06-30 |
As at 2023-06-30 |
2022-07-01 to 2023-06-30 |
As at 2023-06-30 |
As at 2022-06-30 |
As at 2022-06-30 |
As at 2022-06-30 |
As at 2022-06-30 |
As at 2022-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
As at 2022-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
As at 2022-06-30 |
As at 2022-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||
| Equity |
7,700,000
GBP
|
— | — |
875,400,000
GBP
|
14,200,000
GBP
|
898,800,000
GBP
|
— | — |
15,600,000
GBP
|
— | — |
913,000,000
GBP
|
— |
–
GBP
|
— |
100,000
GBP
|
901,000,000
GBP
|
15,600,000
GBP
|
21,800,000
GBP
|
33,200,000
GBP
|
945,000,000
GBP
|
— | — | — | — | — |
966,800,000
GBP
|
— | — | — |
4,900,000
GBP
|
100,000
GBP
|
932,700,000
GBP
|
46,200,000
GBP
|
15. 6
GBP
|
100,000
GBP
|
21,100,000
GBP
|
941,000,000
GBP
|
1,100,000
GBP
|
911,600,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
83,300,000
GBP
|
— | — | — |
3,200,000
GBP
|
–
GBP
|
— |
–
GBP
|
83,300,000
GBP
|
— |
86,500,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
91,900,000
GBP
|
88,500,000
GBP
|
–
GBP
|
–
GBP
|
3,400,000
GBP
|
— |
–
GBP
|
88,500,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — |
21,300,000
GBP
|
— | — | — | — | — | — | — | — |
74,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
83,300,000
GBP
|
— | — | — |
2,500,000
GBP
|
25,500,000
GBP
|
— |
–
GBP
|
62,700,000
GBP
|
— |
6 5.2
GBP
|
— |
4,900,000
GBP
|
— | — | — | — | — | — |
166. 1
GBP
|
161,900,000
GBP
|
6,000,000
GBP
|
–
GBP
|
4,200,000
GBP
|
— |
79,400,000
GBP
|
88,500,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
18,500,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— |
–
GBP
|
18. 5
GBP
|
— |
18,500,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
24,500,000
GBP
|
24,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
24. 5
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — |