Statement Of Changes In Equity [Abstract]
| Concept |
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 |
|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||
| Statement of changes in equity [line items] | ||||||
| Purchase of treasury shares |
7,100,000
GBP
|
— |
7,100,000
GBP
|
5,000,000
GBP
|
— |
5,000,000
GBP
|
| Sale or issue of treasury shares |
3,255,000
GBP
|
2,692,000
GBP
|
563,000
GBP
|
1,126,000
GBP
|
1,042,000
GBP
|
84,000
GBP
|