Statement Of Comprehensive Income [Abstract]
| Concept |
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 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||
| Profit (loss) |
229 .4
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
229. 4
GBP
|
–
GBP
|
10 9 . 5
GBP
|
–
GBP
|
–
GBP
|
10 9. 5
GBP
|
–
GBP
|
–
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans |
5 .7
GBP
|
— | — | — | — | — | — | — |
5,300,000
GBP
|
— | — | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||
| Cash flow hedges [abstract] | ||||||||||||||
| Other comprehensive income, before tax, cash flow hedges |
47. 3
GBP
|
— | — | — | — | — | — | — |
16 .1
GBP
|
— | — | — | — | — |
| Other comprehensive income, before tax |
53. 0
GBP
|
— | — | — | — | — | — | — |
21. 4
GBP
|
— | — | — | — | — |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss |
1. 4
GBP
|
— | — | — | — | — | — | — |
1 . 0
GBP
|
— | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss |
11 . 9
GBP
|
— | — | — | — | — | — | — |
2,800,000
GBP
|
— | — | — | — | — |
| Other comprehensive income |
39,700,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
35,400,000
GBP
|
–
GBP
|
4,300,000
GBP
|
–
GBP
|
1 7. 6
GBP
|
–
GBP
|
–
GBP
|
4,300,000
GBP
|
–
GBP
|
13 . 3
GBP
|
| Comprehensive income |
2 6 9 .1
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
35. 4
GBP
|
–
GBP
|
233,700,000
GBP
|
–
GBP
|
1 2 7.1
GBP
|
–
GBP
|
–
GBP
|
11 3 . 8
GBP
|
–
GBP
|
13 . 3
GBP
|