Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | — |
3,847 .1
GBP
|
3,134,100,000
GBP
|
— | — |
| Interest paid, classified as operating activities | — |
12. 4
GBP
|
10,700,000
GBP
|
— | — |
| Interest received, classified as operating activities | — |
103,900,000
GBP
|
21,100,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities | — |
18,700,000
GBP
|
6,500,000
GBP
|
— | — |
| Cash flows from (used in) operating activities | — |
3,919,900,000
GBP
|
3,138,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||
| Purchase of property, plant and equipment, classified as investing activities | — |
3,600,000
GBP
|
4,600,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities | — |
5,200,000
GBP
|
7,300,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — |
2,587,300,000
GBP
|
490,400,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||
| Proceeds from issuing shares | — |
600,000
GBP
|
3,400,000
GBP
|
— | — |
| Payments to acquire or redeem entity's shares | — |
10,100,000
GBP
|
–
GBP
|
— | — |
| Proceeds from borrowings, classified as financing activities | — |
529,000,000
GBP
|
43,000,000
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities | — |
359,000,000
GBP
|
43,000,000
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities | — |
5,900,000
GBP
|
3,800,000
GBP
|
— | — |
| Interest paid, classified as financing activities | — |
700,000
GBP
|
900,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — |
153,900,000
GBP
|
1,300,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
1,486,500,000
GBP
|
2,646,300,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
136,600,000
GBP
|
51,400,000
GBP
|
— | — |
| Cash and cash equivalents |
7,679,400,000
GBP
|
— | — |
6,056,300,000
GBP
|
3,358,600,000
GBP
|