Statement Of Comprehensive Income [Abstract]
| Concept |
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 |
2020-05-03 to 2021-05-01 |
2020-05-03 to 2021-05-01 |
2020-05-03 to 2021-05-01 |
2020-05-03 to 2021-05-01 |
2020-05-03 to 2021-05-01 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
–
GBP
|
59,000,000
GBP
|
59,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
12,000,000
GBP
|
12,000,000
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 | — | — | — |
14,000,000
GBP
|
— | — | — | — |
51,000,000
GBP
|
— |
| Reclassification adjustments on cash flow hedges, before tax | — | — | — |
28,000,000
GBP
|
— | — | — | — |
11,000,000
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 | — | — | — |
12,000,000
GBP
|
— | — | — | — |
13,000,000
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 | — | — | — |
2,000,000
GBP
|
— | — | — | — |
-
GBP
|
— |
| Other comprehensive income |
–
GBP
|
4 6
GBP
|
–
GBP
|
99,000,000
GBP
|
145,000,000
GBP
|
–
GBP
|
–
GBP
|
14,000,000
GBP
|
57,000,000
GBP
|
43,000,000
GBP
|
| Comprehensive income |
–
GBP
|
4 6
GBP
|
–
GBP
|
158,000,000
GBP
|
20 4
GBP
|
–
GBP
|
–
GBP
|
14,000,000
GBP
|
69,000,000
GBP
|
55,000,000
GBP
|