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 |
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] | ||||||||||
| Decrease (increase) through tax on share-based payment transactions, equity |
—
GBP
|
—
GBP
|
88,000
GBP
|
88,000
GBP
|
—
GBP
|
—
GBP
|
275,000
GBP
|
—
GBP
|
—
GBP
|
275,000
GBP
|
| Increase (decrease) through transactions with owners, equity |
1,000
GBP
|
33,000
GBP
|
35,576,000
GBP
|
33,706,000
GBP
|
1,904,000
GBP
|
267,000
GBP
|
44,053,000
GBP
|
272,000
GBP
|
—
GBP
|
44,592,000
GBP
|
| Purchase of treasury shares |
—
GBP
|
—
GBP
|
2,000,000
GBP
|
—
GBP
|
2,000,000
GBP
|
— | — | — | — | — |