Statement Of Changes In Equity [Abstract]
| Concept |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
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 |
2021-10-01 to 2022-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||
| Increase (decrease) through exercise of options, equity |
200,000
GBP
|
-
GBP
|
300,000
GBP
|
3,900,000
GBP
|
11,400,000
GBP
|
-
GBP
|
14,800,000
GBP
|
700,000
GBP
|
9,600,000
GBP
|
1,000,000
GBP
|
-
GBP
|
-
GBP
|
400,000
GBP
|
10,300,000
GBP
|
| Decrease (increase) through tax on share-based payment transactions, equity |
-
GBP
|
-
GBP
|
-
GBP
|
1,900,000
GBP
|
1,900,000
GBP
|
-
GBP
|
-
GBP
|
500,000
GBP
|
-
GBP
|
-
GBP
|
-
GBP
|
-
GBP
|
-
GBP
|
500,000
GBP
|
| Purchase of treasury shares |
-
GBP
|
-
GBP
|
-
GBP
|
120,500,000
GBP
|
-
GBP
|
-
GBP
|
120,500,000
GBP
|
79,500,000
GBP
|
79,500,000
GBP
|
-
GBP
|
-
GBP
|
-
GBP
|
-
GBP
|
-
GBP
|
| Cancellation of treasury shares |
12,900,000
GBP
|
12,900,000
GBP
|
-
GBP
|
-
GBP
|
67,300,000
GBP
|
-
GBP
|
67,300,000
GBP
|
-
GBP
|
109,400,000
GBP
|
-
GBP
|
-
GBP
|
21,500,000
GBP
|
21,500,000
GBP
|
109,400,000
GBP
|