Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-03-31 |
As at 2022-03-26 |
As at 2021-03-27 |
As at 2020-03-28 |
|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||
| Property, plant and equipment [abstract] | ||||
| Property, plant and equipment |
10 2 .7
GBP
|
— |
10 0 . 0
GBP
|
— |
| Intangible assets and goodwill [abstract] | ||||
| Intangible assets and goodwill |
3 7. 5
GBP
|
— |
3 2. 3
GBP
|
— |
| Miscellaneous non-current assets [abstract] | ||||
| Non-current net defined benefit asset |
31. 6
GBP
|
— |
–
GBP
|
— |
| Non-current derivative financial assets |
0 .1
GBP
|
— |
0 .1
GBP
|
— |
| Trade and other current receivables [abstract] | ||||
| Trade and other current receivables |
89,000,000
GBP
|
— |
98,800,000
GBP
|
— |
| Current prepayments and current accrued income including current contract assets [abstract] | ||||
| Current accrued income including current contract assets [abstract] | ||||
| Current contract assets |
8,000,000
GBP
|
— |
14 . 8
GBP
|
— |
| Classes of current inventories [abstract] | ||||
| Current inventories |
5 0 .1
GBP
|
— |
5 4.5
GBP
|
— |
| Classes of current inventories, alternative [abstract] | ||||
| Cash and cash equivalents [abstract] | ||||
| Cash [abstract] | ||||
| Cash | — |
20,300,000
GBP
|
25 .7
GBP
|
— |
| Cash equivalents [abstract] | ||||
| Short-term deposits, classified as cash equivalents | — |
4,000,000
GBP
|
–
GBP
|
— |
| Cash and cash equivalents |
24,300,000
GBP
|
24,300,000
GBP
|
25 .7
GBP
|
14 . 5
GBP
|
| Miscellaneous current assets [abstract] | ||||
| Current derivative financial assets |
3,300,000
GBP
|
— |
7. 4
GBP
|
— |
| Borrowings [abstract] | ||||
| Non-current portion of non-current borrowings |
9 2 .6
GBP
|
— |
74 . 2
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | ||||
| Trade and other current payables [abstract] | ||||
| Trade and other current payables |
80,000,000
GBP
|
— |
1 20.5
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | ||||
| Non-current net defined benefit liability |
1. 8
GBP
|
— |
20,500,000
GBP
|
— |
| Non-current derivative financial liabilities |
–
GBP
|
— |
0 .1
GBP
|
— |
| Other non-current liabilities |
1 .1
GBP
|
— |
0 .7
GBP
|
— |
| Miscellaneous current liabilities [abstract] | ||||
| Current derivative financial liabilities |
4. 8
GBP
|
— |
8. 2
GBP
|
— |
| Issued capital [abstract] | ||||
| Issued capital |
8 8.8
GBP
|
— |
88,800,000
GBP
|
— |
| Retained earnings [abstract] | ||||
| Retained earnings |
3 5 .1
GBP
|
— |
14 . 9
GBP
|
— |
| Accumulated other comprehensive income [abstract] | ||||
| Reserve of exchange differences on translation |
4,200,000
GBP
|
— |
5 .7
GBP
|
— |
| Reserve of cash flow hedges |
500,000
GBP
|
— |
800,000
GBP
|
— |
| Miscellaneous equity [abstract] | ||||
| Capital redemption reserve |
5,900,000
GBP
|
— |
5,900,000
GBP
|
— |
| Net assets (liabilities) [abstract] | ||||
| Assets |
378. 5
GBP
|
— |
3 7 7.1
GBP
|
— |
| Liabilities |
216 .7
GBP
|
— |
26 5.7
GBP
|
— |
| Assets (liabilities) |
161. 8
GBP
|
— |
111 . 4
GBP
|
— |
| Net current assets (liabilities) [abstract] | ||||
| Current assets |
17 5 .1
GBP
|
— |
2 0 1. 6
GBP
|
— |
| Current liabilities |
1 0 7. 3
GBP
|
— |
15 4. 6
GBP
|
— |
| Assets less current liabilities [abstract] |