Statement Of Comprehensive Income [Abstract]
| Concept |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||
| Profit (loss) |
334,022,000
GBP
|
–
GBP
|
28,872,000
GBP
|
375,674,000
GBP
|
–
GBP
|
–
GBP
|
12,780,000
GBP
|
334,022,000
GBP
|
346,802,000
GBP
|
312,373,000
GBP
|
–
GBP
|
312,373,000
GBP
|
13,629,000
GBP
|
–
GBP
|
–
GBP
|
369,843,000
GBP
|
43,841,000
GBP
|
326,002,000
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 |
2,811,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
–
GBP
|
2,811,000
GBP
|
2,811,000
GBP
|
748,000
GBP
|
–
GBP
|
748,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
748,000
GBP
|
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||
| Cash flow hedges [abstract] | ||||||||||||||||||
| Other comprehensive income, before tax, cash flow hedges |
164,422,000
GBP
|
–
GBP
|
— | — |
164,422,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
164,422,000
GBP
|
88,776,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
88,776,000
GBP
|
–
GBP
|
— | — |
88,776,000
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 |
800,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
–
GBP
|
800,000
GBP
|
800,000
GBP
|
210,000
GBP
|
–
GBP
|
210,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
210,000
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 |
30,374,000
GBP
|
–
GBP
|
— | — |
30,374,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
30,374,000
GBP
|
16,138,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
16,138,000
GBP
|
–
GBP
|
— | — |
16,138,000
GBP
|
| Other comprehensive income | — | — | — | — | — | — | — | — |
88,757,000
GBP
|
— | — | — | — | — | — | — | — |
98,649,000
GBP
|
| Comprehensive income |
243,242,000
GBP
|
–
GBP
|
— | — |
92,791,000
GBP
|
–
GBP
|
14,803,000
GBP
|
336,033,000
GBP
|
258,045,000
GBP
|
411,485,000
GBP
|
–
GBP
|
311,835,000
GBP
|
13,166,000
GBP
|
99,650,000
GBP
|
–
GBP
|
— | — |
424,651,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — | — |
243,242,000
GBP
|
— | — | — | — | — | — | — | — |
411,485,000
GBP
|
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — | — |
14,803,000
GBP
|
— | — | — | — | — | — | — | — |
13,166,000
GBP
|