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 |
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
|
–
GBP
|
183,700,000
GBP
|
183,700,000
GBP
|
–
GBP
|
–
GBP
|
183,700,000
GBP
|
–
GBP
|
284,800,000
GBP
|
284,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
284,800,000
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 | — | — | — |
800,000
GBP
|
— | — | — | — | — | — | — | — | — |
34,200,000
GBP
|
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations | — | — | — |
3,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
43,100,000
GBP
|
| Cash flow hedges [abstract] | ||||||||||||||
| Other comprehensive income, before tax, cash flow hedges | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — | — | — |
3,900,000
GBP
|
| Hedges of net investment in foreign operations [abstract] | ||||||||||||||
| Gains (losses) on hedges of net investments in foreign operations, before tax | — | — | — |
3,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
5,400,000
GBP
|
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | — | — | — |
200,000
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 | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — | — | — |
7,900,000
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 | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
700,000
GBP
|
| Other comprehensive income |
100,000
GBP
|
700,000
GBP
|
–
GBP
|
100,000
GBP
|
–
GBP
|
–
GBP
|
700,000
GBP
|
–
GBP
|
25,300,000
GBP
|
26,300,000
GBP
|
51,600,000
GBP
|
–
GBP
|
–
GBP
|
25,300,000
GBP
|
| Comprehensive income |
100,000
GBP
|
700,000
GBP
|
183,700,000
GBP
|
183,600,000
GBP
|
–
GBP
|
–
GBP
|
184,400,000
GBP
|
–
GBP
|
310,100,000
GBP
|
258,500,000
GBP
|
51,600,000
GBP
|
–
GBP
|
–
GBP
|
310,100,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — |
183,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
310,100,000
GBP
|
| Comprehensive income, attributable to non-controlling interests | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|