Statement Of Changes In Equity [Abstract]
| Concept |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||
| Statement of changes in equity [line items] | ||||||||||||
| Increase (decrease) through transactions with owners, equity |
159,600,000
GBP
|
–
GBP
|
2,200,000
GBP
|
–
GBP
|
161,800,000
GBP
|
–
GBP
|
103,200,000
GBP
|
–
GBP
|
–
GBP
|
104,600,000
GBP
|
1,400,000
GBP
|
–
GBP
|
| Purchase of treasury shares |
7 .4
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
7 .4
GBP
|
–
GBP
|
2,500,000
GBP
|
–
GBP
|
–
GBP
|
2,500,000
GBP
|
–
GBP
|
–
GBP
|