Statement Of Changes In Equity [Abstract]
| Concept |
As at 2022-08-31 |
2021-09-01 to 2022-08-31 |
2021-09-01 to 2022-08-31 |
2021-09-01 to 2022-08-31 |
As at 2022-08-31 |
2021-09-01 to 2022-08-31 |
2021-09-01 to 2022-08-31 |
As at 2022-08-31 |
2021-09-01 to 2022-08-31 |
As at 2022-08-31 |
As at 2022-08-31 |
As at 2022-08-31 |
As at 2022-08-31 |
As at 2022-08-31 |
2021-09-01 to 2022-08-31 |
2021-09-01 to 2022-08-31 |
2020-09-01 to 2021-08-31 |
As at 2021-08-31 |
2020-09-01 to 2021-08-31 |
As at 2021-08-31 |
As at 2021-08-31 |
2020-09-01 to 2021-08-31 |
2020-09-01 to 2021-08-31 |
As at 2021-08-31 |
2020-09-01 to 2021-08-31 |
2020-09-01 to 2021-08-31 |
2020-09-01 to 2021-08-31 |
2020-09-01 to 2021-08-31 |
As at 2021-08-31 |
As at 2021-08-31 |
As at 2021-08-31 |
As at 2021-08-31 |
As at 2020-08-31 |
As at 2020-08-31 |
As at 2020-08-31 |
As at 2020-08-31 |
As at 2020-08-31 |
As at 2020-08-31 |
As at 2020-08-31 |
As at 2020-08-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||
| Equity |
2 4 5 .7
GBP
|
— | — | — |
6 81. 2
GBP
|
— | — |
5 8.9
GBP
|
— |
2 .1
GBP
|
26. 2
GBP
|
1 , 0 14 . 9
GBP
|
2 .7
GBP
|
3,500,000
GBP
|
— | — | — |
14 . 3
GBP
|
— |
2 . 4
GBP
|
58,900,000
GBP
|
— | — |
1, 0 3 4 .0
GBP
|
— | — | — | — |
3,500,000
GBP
|
2 4 5 .7
GBP
|
2 .1
GBP
|
7 11 . 9
GBP
|
2,000,000
GBP
|
810 . 3
GBP
|
1 5.8
GBP
|
–
GBP
|
5 7 7. 0
GBP
|
2 .1
GBP
|
3,500,000
GBP
|
2 4 5 .7
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
3 0 . 8
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — |
3 0 . 8
GBP
|
–
GBP
|
12 8 . 4
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
— |
12 8 . 4
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
6 .1
GBP
|
–
GBP
|
— |
6,400,000
GBP
|
0. 3
GBP
|
— |
–
GBP
|
— | — | — | — | — |
–
GBP
|
–
GBP
|
2 9.8
GBP
|
— |
–
GBP
|
— | — |
3 0 .1
GBP
|
–
GBP
|
— |
–
GBP
|
0 .3
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
2 4 .7
GBP
|
–
GBP
|
— |
6,400,000
GBP
|
0. 3
GBP
|
— |
–
GBP
|
— | — | — | — | — |
3 0 . 8
GBP
|
–
GBP
|
15 8 . 2
GBP
|
— |
–
GBP
|
— | — |
3 0 .1
GBP
|
–
GBP
|
— |
12 8 . 4
GBP
|
0 .3
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
800,000
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — |
800,000
GBP
|
–
GBP
|
9,400,000
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
— |
9,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |