Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-12-31 |
2022-12-26 to 2023-12-31 |
2021-12-27 to 2022-12-25 |
As at 2022-12-25 |
As at 2021-12-26 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | — |
136,400,000
GBP
|
103,800,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities | — |
22,900,000
GBP
|
18,700,000
GBP
|
— | — |
| Cash flows from (used in) operating activities | — |
113,500,000
GBP
|
85,100,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
–
GBP
|
3,700,000
GBP
|
— | — |
| Other cash receipts from sales of equity or debt instruments of other entities, classified as investing activities | — |
70,600,000
GBP
|
–
GBP
|
— | — |
| Other cash receipts from sales of interests in joint ventures, classified as investing activities | — |
–
GBP
|
3,300,000
GBP
|
— | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
4,400,000
GBP
|
–
GBP
|
— | — |
| Purchase of property, plant and equipment, classified as investing activities | — |
9,800,000
GBP
|
10,500,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities | — |
11,000,000
GBP
|
9,200,000
GBP
|
— | — |
| Interest received, classified as investing activities | — |
600,000
GBP
|
100,000
GBP
|
— | — |
| Other inflows (outflows) of cash, classified as investing activities | — |
12,300,000
GBP
|
6,800,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — |
94,700,000
GBP
|
29,500,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares | — |
98,300,000
GBP
|
86,500,000
GBP
|
— | — |
| Proceeds from borrowings, classified as financing activities | — |
113,000,000
GBP
|
365,800,000
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities | — |
112,200,000
GBP
|
323,400,000
GBP
|
— | — |
| Dividends paid, classified as financing activities | — |
41,900,000
GBP
|
43,800,000
GBP
|
— | — |
| Interest paid, classified as financing activities | — |
13,700,000
GBP
|
4,900,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — |
186,500,000
GBP
|
127,400,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
21,700,000
GBP
|
12,800,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
–
GBP
|
400,000
GBP
|
— | — |
| Cash and cash equivalents |
52,100,000
GBP
|
— | — |
30,400,000
GBP
|
42,800,000
GBP
|