Statement Of Comprehensive Income [Abstract]
| Concept |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
311,000,000
GBP
|
42,200,000
GBP
|
–
GBP
|
268,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
268,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
288,400,000
GBP
|
54,100,000
GBP
|
234,300,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
234,500,000
GBP
|
200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] | ||||||||||||||||||||||||
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans | — | — | — | — |
12,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
8,800,000
GBP
|
— | — | — | — | — | — | — | — |
| Other comprehensive income |
1,200,000
GBP
|
— | — |
1,900,000
GBP
|
48,100,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
9,000,000
GBP
|
–
GBP
|
36,000,000
GBP
|
–
GBP
|
— | — |
44,600,000
GBP
|
45,200,000
GBP
|
–
GBP
|
–
GBP
|
7,600,000
GBP
|
100,000
GBP
|
1,000,000
GBP
|
6,100,000
GBP
|
–
GBP
|
| Comprehensive income |
1,200,000
GBP
|
— | — |
1,900,000
GBP
|
220,700,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
259,800,000
GBP
|
–
GBP
|
36,000,000
GBP
|
–
GBP
|
— | — |
278,900,000
GBP
|
45,200,000
GBP
|
–
GBP
|
–
GBP
|
226,900,000
GBP
|
300,000
GBP
|
1,000,000
GBP
|
6,100,000
GBP
|
–
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — |
220,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
279,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — |