Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2022-03-31 |
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As at 2021-03-31 |
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As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | ||||||||||||||||||||||||||||||||||||
| Assets | — | — | — | — | — | — | — | — | — |
549,200,000
GBP
|
— | — | — | — | — | — |
615,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | ||||||||||||||||||||||||||||||||||||
| Liabilities | — | — | — | — | — | — | — | — | — |
476,800,000
GBP
|
— | — | — | — | — | — |
519,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity |
500,000
GBP
|
3,000,000
GBP
|
–
GBP
|
73,400,000
GBP
|
22,200,000
GBP
|
1,200,000
GBP
|
3,000,000
GBP
|
104,400,000
GBP
|
60,700,000
GBP
|
72,400,000
GBP
|
1,000,000
GBP
|
11,800,000
GBP
|
9,600,000
GBP
|
500,000
GBP
|
–
GBP
|
22,200,000
GBP
|
96,400,000
GBP
|
33,100,000
GBP
|
1,200,000
GBP
|
104,300,000
GBP
|
1,300,000
GBP
|
97,700,000
GBP
|
3,000,000
GBP
|
4,000,000
GBP
|
1,000,000
GBP
|
69,700,000
GBP
|
11,700,000
GBP
|
22,200,000
GBP
|
68,600,000
GBP
|
9,700,000
GBP
|
2,700,000
GBP
|
500,000
GBP
|
–
GBP
|
103,700,000
GBP
|
1,200,000
GBP
|
57,100,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |