Statement Of Cash Flows [Abstract]
| Concept |
As at 2025-03-30 |
2024-04-01 to 2025-03-30 |
2023-04-01 to 2024-03-31 |
As at 2024-03-31 |
As at 2023-03-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | — |
204,700,000
GBP
|
185,200,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities | — |
12,200,000
GBP
|
18,800,000
GBP
|
— | — |
| Cash flows from (used in) operating activities | — |
196,300,000
GBP
|
167 .9
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||
| Purchase of property, plant and equipment, classified as investing activities | — |
8,400,000
GBP
|
18,200,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities | — |
10,300,000
GBP
|
10,200,000
GBP
|
— | — |
| Interest received, classified as investing activities | — |
3,400,000
GBP
|
2,900,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — |
15,300,000
GBP
|
25,500,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares | — |
–
GBP
|
50,500,000
GBP
|
— | — |
| Proceeds from borrowings, classified as financing activities | — |
250,000,000
GBP
|
–
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities | — |
283,000,000
GBP
|
–
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities | — |
49,300,000
GBP
|
43,600,000
GBP
|
— | — |
| Dividends paid, classified as financing activities | — |
9,500,000
GBP
|
57 .8
GBP
|
— | — |
| Interest paid, classified as financing activities | — |
31,500,000
GBP
|
19,900,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — |
134,200,000
GBP
|
185,900,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
46,800,000
GBP
|
43,500,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
2,000,000
GBP
|
2,900,000
GBP
|
— | — |
| Cash and cash equivalents |
155,900,000
GBP
|
— | — |
111,100,000
GBP
|
157 .5
GBP
|