Statement Of Comprehensive Income [Abstract]
| Concept |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||||||||
| Profit (loss) |
3,700,000
GBP
|
247,900,000
GBP
|
–
GBP
|
–
GBP
|
200,000
GBP
|
–
GBP
|
244,200,000
GBP
|
244,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
244,200,000
GBP
|
–
GBP
|
222,500,000
GBP
|
19,200,000
GBP
|
203,300,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
203,300,000
GBP
|
–
GBP
|
–
GBP
|
203,400,000
GBP
|
–
GBP
|
100,000
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 | — | — | — | — | — | — | — | — | — | — | — |
41,600,000
GBP
|
— | — | — | — | — | — | — | — |
30,600,000
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 | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
2,800,000
GBP
|
— | — | — | — | — |
| Cash flow hedges [abstract] | ||||||||||||||||||||||||||
| Other comprehensive income, before tax, cash flow hedges | — | — | — | — | — | — | — | — | — | — | — |
1,500,000
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — | — | — | — | — | — | — | — | — | — |
9,600,000
GBP
|
— | — | — | — | — | — | — | — |
5,900,000
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 | — | — | — | — | — | — | — | — | — | — | — |
400,000
GBP
|
— | — | — | — | — | — | — | — |
200,000
GBP
|
— | — | — | — | — |
| Other comprehensive income | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
43,900,000
GBP
|
— |
32,000,000
GBP
|
1,700,000
GBP
|
–
GBP
|
1,100,000
GBP
|
73,100,000
GBP
|
–
GBP
|
— | — | — |
75,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
99,400,000
GBP
|
–
GBP
|
–
GBP
|
24,700,000
GBP
|
800,000
GBP
|
–
GBP
|
| Comprehensive income | — | — |
–
GBP
|
–
GBP
|
200,000
GBP
|
43,900,000
GBP
|
— |
276,400,000
GBP
|
1,700,000
GBP
|
–
GBP
|
1,100,000
GBP
|
317,300,000
GBP
|
–
GBP
|
— | — | — |
75,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
103,900,000
GBP
|
–
GBP
|
–
GBP
|
178,700,000
GBP
|
800,000
GBP
|
100,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — | — | — | — | — |
317,500,000
GBP
|
— | — | — | — | — | — | — | — |
104,000,000
GBP
|
— | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — | — | — | — | — |
200,000
GBP
|
— | — | — | — | — | — | — | — |
100,000
GBP
|
— | — | — | — | — |