Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||
| Statement of changes in equity [line items] | ||||||||||||
| Increase (decrease) through exercise of options, equity |
100,000
GBP
|
–
GBP
|
2,500,000
GBP
|
2,700,000
GBP
|
–
GBP
|
300,000
GBP
|
0
GBP
|
0
GBP
|
1,300,000
GBP
|
1,300,000
GBP
|
2,000,000
GBP
|
2,000,000
GBP
|
| Increase (decrease) through transactions with owners, equity |
7,900,000
GBP
|
107,600,000
GBP
|
2,500,000
GBP
|
2,700,000
GBP
|
100,000
GBP
|
100,000,000
GBP
|
0
GBP
|
200,000
GBP
|
107,600,000
GBP
|
1,300,000
GBP
|
300,000
GBP
|
106,200,000
GBP
|
| Purchase of treasury shares |
8,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
8,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
2,300,000
GBP
|
2,300,000
GBP
|