Statement Of Comprehensive Income [Abstract]
| Concept |
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 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||
| Profit (loss) |
37 .8
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3 7 .8
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
123,900,000
GBP
|
–
GBP
|
–
GBP
|
123,900,000
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 |
0. 9
GBP
|
— | — | — | — | — | — | — | — | — | — |
–
GBP
|
| Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] | ||||||||||||
| Cash flow hedges [abstract] | ||||||||||||
| Reclassification adjustments on cash flow hedges, net of tax |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
300,000
GBP
|
| Other comprehensive income |
1,300,000
GBP
|
0. 4
GBP
|
–
GBP
|
–
GBP
|
900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,800,000
GBP
|
–
GBP
|
–
GBP
|
1,800,000
GBP
|
| Comprehensive income |
36,500,000
GBP
|
400,000
GBP
|
–
GBP
|
–
GBP
|
36,900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
125. 7
GBP
|
–
GBP
|
–
GBP
|
125,700,000
GBP
|