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 |
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) |
9,500,000
GBP
|
21,000,000
GBP
|
12,500,000
GBP
|
12,500,000
GBP
|
21,000,000
GBP
|
8,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
100,000
GBP
|
20,000,000
GBP
|
20,400,000
GBP
|
20,400,000
GBP
|
20,000,000
GBP
|
300,000
GBP
|
–
GBP
|
–
GBP
|
400,000
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — | — |
7,700,000
GBP
|
–
GBP
|
7,700,000
GBP
|
— | — | — | — | — | — | — | — |
39,000,000
GBP
|
–
GBP
|
— | — | — |
39,000,000
GBP
|
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||
| Cash flow hedges [abstract] | ||||||||||||||||||||
| Other comprehensive income, before tax, cash flow hedges | — | — | — |
16,400,000
GBP
|
–
GBP
|
16,400,000
GBP
|
— | — | — | — | — | — | — | — |
29,100,000
GBP
|
–
GBP
|
— | — | — |
29,100,000
GBP
|
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — | — |
2,200,000
GBP
|
–
GBP
|
2,200,000
GBP
|
— | — | — | — | — | — | — | — |
9,800,000
GBP
|
–
GBP
|
— | — | — |
9,800,000
GBP
|
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — | — |
4,100,000
GBP
|
–
GBP
|
4,100,000
GBP
|
— | — | — | — | — | — | — | — |
7,300,000
GBP
|
–
GBP
|
— | — | — |
7,300,000
GBP
|
| Other comprehensive income |
17,800,000
GBP
|
— | — |
17,800,000
GBP
|
–
GBP
|
17,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
7,400,000
GBP
|
— | — |
7,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
7,400,000
GBP
|
| Comprehensive income |
27,300,000
GBP
|
— | — |
5. 3
GBP
|
21,000,000
GBP
|
26,300,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
7,300,000
GBP
|
— | — |
13,000,000
GBP
|
20,000,000
GBP
|
300,000
GBP
|
–
GBP
|
–
GBP
|
7,000,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — |
27,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
7,300,000
GBP
|
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
300,000
GBP
|