Statement Of Comprehensive Income [Abstract]
| Concept |
2021-01-31 to 2022-01-29 |
2021-01-31 to 2022-01-29 |
2021-01-31 to 2022-01-29 |
2021-01-31 to 2022-01-29 |
2021-01-31 to 2022-01-29 |
2021-01-31 to 2022-01-29 |
2021-01-31 to 2022-01-29 |
2021-01-31 to 2022-01-29 |
2021-01-31 to 2022-01-29 |
2021-01-31 to 2022-01-29 |
2020-01-26 to 2021-01-30 |
2020-01-26 to 2021-01-30 |
2020-01-26 to 2021-01-30 |
2020-01-26 to 2021-01-30 |
2020-01-26 to 2021-01-30 |
2020-01-26 to 2021-01-30 |
2020-01-26 to 2021-01-30 |
2020-01-26 to 2021-01-30 |
2020-01-26 to 2021-01-30 |
2020-01-26 to 2021-01-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||
| Profit (loss) |
677,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
677,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
286,700,000
GBP
|
–
GBP
|
286,700,000
GBP
|
–
GBP
|
–
GBP
|
–
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 | — | — | — | — | — | — |
55,100,000
GBP
|
— | — | — | — | — | — | — |
57,100,000
GBP
|
— | — | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations | — | — | — | — | — | — |
2,400,000
GBP
|
— | — | — | — | — | — | — |
2,500,000
GBP
|
— | — | — | — | — |
| Cash flow hedges [abstract] | ||||||||||||||||||||
| Other comprehensive income, before tax, cash flow hedges | — | — | — | — | — | — |
36,900,000
GBP
|
— | — | — | — | — | — | — |
14,200,000
GBP
|
— | — | — | — | — |
| Cost of hedging [abstract] | ||||||||||||||||||||
| Change in value of time value of options [abstract] | ||||||||||||||||||||
| Other comprehensive income, before tax, change in value of time value of options | — | — | — | — | — | — |
800,000
GBP
|
— | — | — | — | — | — | — |
500,000
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 | — | — | — | — | — | — |
13,800,000
GBP
|
— | — | — | — | — | — | — |
10,800,000
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 | — | — | — | — | — | — |
7,200,000
GBP
|
— | — | — | — | — | — | — |
2,800,000
GBP
|
— | — | — | — | — |
| Other comprehensive income |
41,300,000
GBP
|
–
GBP
|
29,900,000
GBP
|
–
GBP
|
2,400,000
GBP
|
600,000
GBP
|
69,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
2,500,000
GBP
|
400,000
GBP
|
46,300,000
GBP
|
–
GBP
|
60,700,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
11,500,000
GBP
|
| Comprehensive income |
718,800,000
GBP
|
–
GBP
|
29,900,000
GBP
|
–
GBP
|
2,400,000
GBP
|
600,000
GBP
|
746,900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
2,500,000
GBP
|
400,000
GBP
|
240,400,000
GBP
|
–
GBP
|
226,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
11,500,000
GBP
|