Statement Of Changes In Equity [Abstract]
| Concept |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||
| Decrease (increase) through tax on share-based payment transactions, equity |
800,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
800,000
GBP
|
—
GBP
|
0. 5
GBP
|
0. 5
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
| Purchase of treasury shares |
86 .6
GBP
|
0 .1
GBP
|
—
GBP
|
—
GBP
|
9,000,000
GBP
|
7 7. 5
GBP
|
—
GBP
|
83. 4
GBP
|
80 . 4
GBP
|
—
GBP
|
0 .1
GBP
|
—
GBP
|
—
GBP
|
2,900,000
GBP
|