Statement Of Comprehensive Income [Abstract]
| Concept |
2022-05-01 to 2023-04-29 |
2022-05-01 to 2023-04-29 |
2022-05-01 to 2023-04-29 |
2022-05-01 to 2023-04-29 |
2022-05-01 to 2023-04-29 |
2021-05-02 to 2022-04-30 |
2021-05-02 to 2022-04-30 |
2021-05-02 to 2022-04-30 |
2021-05-02 to 2022-04-30 |
2021-05-02 to 2022-04-30 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||
| Profit (loss) |
4 8 1
GBP
|
4 8 1
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
71,000,000
GBP
|
71,000,000
GBP
|
| Other comprehensive income [abstract] | ||||||||||
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||
| Cash flow hedges [abstract] | ||||||||||
| Gains (losses) on cash flow hedges, before tax |
11,000,000
GBP
|
— | — | — | — | — | — | — |
14,000,000
GBP
|
— |
| Reclassification adjustments on cash flow hedges, before tax |
3,000,000
GBP
|
— | — | — | — | — | — | — |
2 8
GBP
|
— |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income |
35,000,000
GBP
|
— | — | — | — | — | — | — |
8,000,000
GBP
|
— |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||
| Income tax relating to cash flow hedges included in other comprehensive income |
–
GBP
|
— | — | — | — | — | — | — |
3,000,000
GBP
|
— |
| Other comprehensive income |
87,000,000
GBP
|
96,000,000
GBP
|
9,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
5 0
GBP
|
–
GBP
|
117,000,000
GBP
|
1 67
GBP
|
| Comprehensive income |
5 6 8
GBP
|
57 7
GBP
|
9,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
5 0
GBP
|
–
GBP
|
188,000,000
GBP
|
23 8
GBP
|