Statement Of Changes In Equity [Abstract]
| Concept |
As at 2025-03-29 |
2024-03-31 to 2025-03-29 |
As at 2025-03-29 |
2024-03-31 to 2025-03-29 |
2024-03-31 to 2025-03-29 |
2024-03-31 to 2025-03-29 |
As at 2025-03-29 |
2024-03-31 to 2025-03-29 |
As at 2025-03-29 |
2024-03-31 to 2025-03-29 |
As at 2025-03-29 |
As at 2025-03-29 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
2023-04-02 to 2024-03-30 |
2023-04-02 to 2024-03-30 |
2023-04-02 to 2024-03-30 |
2023-04-02 to 2024-03-30 |
2023-04-02 to 2024-03-30 |
2023-04-02 to 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||
| Equity |
86,900,000
GBP
|
— |
351,700,000
GBP
|
— | — | — |
9,300,000
GBP
|
— |
1,442,000,000
GBP
|
— |
1,010,000,000
GBP
|
2,700,000
GBP
|
86,900,000
GBP
|
2,700,000
GBP
|
351,700,000
GBP
|
— | — | — | — | — | — |
9,300,000
GBP
|
894,900,000
GBP
|
1,326,900,000
GBP
|
86,800,000
GBP
|
1,406,000,000
GBP
|
974,300,000
GBP
|
2,500,000
GBP
|
351,700,000
GBP
|
9,300,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— |
124,900,000
GBP
|
— |
124,900,000
GBP
|
— | — | — | — | — |
112,500,000
GBP
|
112,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— |
9,600,000
GBP
|
— |
9,600,000
GBP
|
— | — | — | — | — |
179,200,000
GBP
|
179,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— |
134,500,000
GBP
|
— |
134,500,000
GBP
|
— | — | — | — | — |
66,700,000
GBP
|
66,700,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
300,000
GBP
|
200,000
GBP
|
100,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— |
14,900,000
GBP
|
— |
14,900,000
GBP
|
— | — | — | — | — |
12,400,000
GBP
|
12,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— |
4,600,000
GBP
|
— |
4,600,000
GBP
|
— | — | — | — | — |
4,400,000
GBP
|
4,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |