Statement Of Comprehensive Income [Abstract]
| Concept |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||
| Profit (loss) |
147,000,000
GBP
|
185,700,000
GBP
|
-
GBP
|
-
GBP
|
-
GBP
|
-
GBP
|
-
GBP
|
185,700,000
GBP
|
332,700,000
GBP
|
30,000,000
GBP
|
169,600,000
GBP
|
-
GBP
|
139,600,000
GBP
|
-
GBP
|
-
GBP
|
139,600,000
GBP
|
-
GBP
|
-
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 | — | — | — | — | — | — | — |
17,700,000
GBP
|
— | — | — | — | — | — | — |
108,900,000
GBP
|
— | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, before tax | — | — | — | — | — | — | — |
11,600,000
GBP
|
— | — | — | — | — | — | — |
12,600,000
GBP
|
— | — |
| Cash flow hedges [abstract] | ||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax | — | — | — | — | — | — | — |
4,300,000
GBP
|
— | — | — | — | — | — | — |
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 | — | — | — | — | — | — | — |
4,400,000
GBP
|
— | — | — | — | — | — | — |
27,200,000
GBP
|
— | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||||
| Income tax relating to exchange differences on translation of foreign operations included in other comprehensive income | — | — | — | — | — | — | — |
700,000
GBP
|
— | — | — | — | — | — | — |
100,000
GBP
|
— | — |
| Income tax relating to cash flow hedges included in other comprehensive income | — | — | — | — | — | — | — |
1,100,000
GBP
|
— | — | — | — | — | — | — |
-
GBP
|
— | — |
| Other comprehensive income | — |
13,300,000
GBP
|
-
GBP
|
10,900,000
GBP
|
3,200,000
GBP
|
-
GBP
|
-
GBP
|
800,000
GBP
|
— | — | — |
12,500,000
GBP
|
81,700,000
GBP
|
-
GBP
|
100,000
GBP
|
94,100,000
GBP
|
-
GBP
|
-
GBP
|
| Comprehensive income | — |
172,400,000
GBP
|
-
GBP
|
10,900,000
GBP
|
3,200,000
GBP
|
-
GBP
|
-
GBP
|
186,500,000
GBP
|
— | — | — |
12,500,000
GBP
|
57,900,000
GBP
|
-
GBP
|
100,000
GBP
|
45,500,000
GBP
|
-
GBP
|
-
GBP
|