Statement Of Changes In Equity [Abstract]
| Concept |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||
| Increase (decrease) through transactions with owners, equity |
41,300,000
GBP
|
0. 3
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
41. 6
GBP
|
20 1. 0
GBP
|
16 8 .9
GBP
|
3,300,000
GBP
|
35 . 4
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Purchase of treasury shares |
3 . 3
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3. 3
GBP
|
–
GBP
|
0 . 3
GBP
|
–
GBP
|
0 . 3
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|