Statement Of Changes In Equity [Abstract]
| Concept |
As at 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
As at 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity |
1,893,700,000
GBP
|
— | — |
20,100,000
GBP
|
37,200,000
GBP
|
4,400,000
GBP
|
817,900,000
GBP
|
1,013,800,000
GBP
|
— | — | — |
300,000
GBP
|
— | — | — |
20,000,000
GBP
|
— | — |
20,100,000
GBP
|
— |
1,033,200,000
GBP
|
817,800,000
GBP
|
— |
37,200,000
GBP
|
— |
1,928,600,000
GBP
|
300,000
GBP
|
— |
32,100,000
GBP
|
20,100,000
GBP
|
817,600,000
GBP
|
1,966,800,000
GBP
|
1,059,600,000
GBP
|
37,100,000
GBP
|
300,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
— | — | — | — | — |
31,200,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
31,200,000
GBP
|
–
GBP
|
— |
25,600,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — |
25,600,000
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income | — |
15,600,000
GBP
|
–
GBP
|
— | — | — | — | — |
2,300,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
17,900,000
GBP
|
12,100,000
GBP
|
— |
800,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — |
12,900,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income | — |
15,600,000
GBP
|
–
GBP
|
— | — | — | — | — |
28,900,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
13,300,000
GBP
|
12,100,000
GBP
|
— |
24,800,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — |
12,700,000
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
–
GBP
|
— | — | — | — | — |
51,000,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
51,000,000
GBP
|
–
GBP
|
— |
45,700,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — |
45,700,000
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
–
GBP
|
— | — | — | — | — |
2,800,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
2,800,000
GBP
|
–
GBP
|
— |
2,400,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — |
2,400,000
GBP
|
— | — | — | — | — | — | — |