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] | ||||||||||||
| Decrease (increase) through tax on share-based payment transactions, equity |
—
GBP
|
—
GBP
|
0. 2
GBP
|
—
GBP
|
—
GBP
|
0. 2
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
1 .0
GBP
|
1 .0
GBP
|
| Increase (decrease) through transactions with owners, equity |
0. 1
GBP
|
—
GBP
|
10. 0
GBP
|
—
GBP
|
—
GBP
|
9,900,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
0. 2
GBP
|
2,800,000
GBP
|
3 .0
GBP
|