Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2025-03-31 |
As at 2025-03-27 |
As at 2024-03-31 |
As at 2024-03-28 |
As at 2023-03-30 |
|---|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||||
| Property, plant and equipment [abstract] | |||||
| Property, plant and equipment | — |
1 61 . 7
GBP
|
— |
1 58 .1
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||||
| Intangible assets and goodwill | — |
98 5 .1
GBP
|
— |
9 7 9. 7
GBP
|
— |
| Trade and other current receivables [abstract] | |||||
| Trade and other current receivables | — |
63,300,000
GBP
|
— |
6 0 .9
GBP
|
— |
| Classes of current inventories [abstract] | |||||
| Current inventories | — |
10 6 .9
GBP
|
— |
9 7. 5
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||||
| Cash and cash equivalents [abstract] | |||||
| Cash and cash equivalents | — |
3 9. 5
GBP
|
— |
5 7. 1
GBP
|
178 .0
GBP
|
| Miscellaneous current assets [abstract] | |||||
| Current derivative financial assets | — |
0. 5
GBP
|
— |
300,000
GBP
|
— |
| Borrowings [abstract] | |||||
| Non-current portion of non-current borrowings | — |
26. 7
GBP
|
— |
4 3 . 3
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||||
| Current borrowings | — |
4 .7
GBP
|
— |
2. 2
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||||
| Trade and other current payables [abstract] | |||||
| Trade and other current payables | — |
255,600,000
GBP
|
— |
24 9. 2
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||||
| Current derivative financial liabilities |
1,700,000
GBP
|
— |
1. 0
GBP
|
— | — |
| Issued capital [abstract] | |||||
| Issued capital | — |
4,600,000
GBP
|
— |
4,700,000
GBP
|
— |
| Retained earnings [abstract] | |||||
| Retained earnings | — |
1, 248. 2
GBP
|
— |
1,24 2.8
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||||
| Reserve of exchange differences on translation | — |
0 .1
GBP
|
— |
100,000
GBP
|
— |
| Reserve of cash flow hedges | — |
1 . 2
GBP
|
— |
500,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||||
| Capital redemption reserve | — |
0. 4
GBP
|
— |
300,000
GBP
|
— |
| Merger reserve | — |
113. 3
GBP
|
— |
113. 3
GBP
|
— |
| Net assets (liabilities) [abstract] | |||||
| Assets | — |
1,656,800,000
GBP
|
— |
1,683 .8
GBP
|
— |
| Liabilities | — |
66 3 . 6
GBP
|
— |
695,300,000
GBP
|
— |
| Assets (liabilities) | — |
993. 2
GBP
|
— |
98 8. 5
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||||
| Current assets | — |
210. 4
GBP
|
— |
215,800,000
GBP
|
— |
| Current liabilities | — |
345,600,000
GBP
|
— |
3 41 . 2
GBP
|
— |
| Assets less current liabilities [abstract] |