Statement Of Cash Flows [Abstract]
| Concept |
2021-06-27 to 2022-07-02 |
As at 2022-07-02 |
As at 2021-06-27 |
As at 2021-06-26 |
2020-06-28 to 2021-06-26 |
As at 2020-06-28 |
|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||
| Cash flows from (used in) operating activities [abstract] | ||||||
| Interest paid, classified as operating activities |
2,200,000.0
GBP
|
— | — | — |
800,000.0
GBP
|
— |
| Income taxes paid (refund), classified as operating activities |
35,200,000.0
GBP
|
— | — | — |
35,500,000.0
GBP
|
— |
| Cash flows from (used in) operating activities |
251,800,000.0
GBP
|
— | — | — |
184,200,000.0
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |
17,700,000.0
GBP
|
— | — | — |
—
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities |
23,300,000.0
GBP
|
— | — | — |
15,100,000.0
GBP
|
— |
| Purchase of intangible assets, classified as investing activities |
700,000.0
GBP
|
— | — | — |
600,000.0
GBP
|
— |
| Interest received, classified as investing activities |
100,000.0
GBP
|
— | — | — |
100,000.0
GBP
|
— |
| Cash flows from (used in) investing activities |
41,600,000.0
GBP
|
— | — | — |
15,600,000.0
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||
| Payments to acquire or redeem entity's shares |
28,300,000.0
GBP
|
— | — | — |
—
GBP
|
— |
| Proceeds from borrowings, classified as financing activities |
85,000,000.0
GBP
|
— | — | — |
—
GBP
|
— |
| Repayments of borrowings, classified as financing activities |
31,000,000.0
GBP
|
— | — | — |
45,000,000.0
GBP
|
— |
| Payments of lease liabilities, classified as financing activities |
50,200,000.0
GBP
|
— | — | — |
54,000,000.0
GBP
|
— |
| Dividends paid, classified as financing activities |
282,100,000.0
GBP
|
— | — | — |
24,300,000.0
GBP
|
— |
| Interest paid, classified as financing activities |
4,800,000.0
GBP
|
— | — | — |
5,300,000.0
GBP
|
— |
| Cash flows from (used in) financing activities |
309,700,000.0
GBP
|
— | — | — |
127,600,000.0
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||
| Effect of exchange rate changes on cash and cash equivalents |
1,100,000.0
GBP
|
— | — | — |
2,400,000.0
GBP
|
— |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes |
99,500,000.0
GBP
|
— | — | — |
41,000,000.0
GBP
|
— |
| Cash and cash equivalents | — |
30,200,000.0
GBP
|
128,600,000
GBP
|
128,600,000.0
GBP
|
— |
90,000,000
GBP
|