Statement Of Comprehensive Income [Abstract]
| Concept |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2021-08-01 to 2022-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
2020-08-01 to 2021-07-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||
| Profit (loss) |
242,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
242,600,000
GBP
|
–
GBP
|
390,700,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
390,700,000
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 |
3,500,000
GBP
|
— | — | — | — | — |
8,500,000
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 |
500,000
GBP
|
— | — | — | — | — |
2,200,000
GBP
|
— | — | — | — | — |
| Other comprehensive income |
3,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3,000,000
GBP
|
–
GBP
|
6,300,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
6,300,000
GBP
|
–
GBP
|
| Comprehensive income |
239,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
239,600,000
GBP
|
–
GBP
|
3 9 7. 0
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3 9 7. 0
GBP
|
–
GBP
|