Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2025-03-30 |
As at 2024-03-31 |
As at 2023-03-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
49,600,000
GBP
|
59,400,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
274,000,000
GBP
|
270,000,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current derivative financial assets |
–
GBP
|
100,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
62,400,000
GBP
|
68,800,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
187 .4
GBP
|
254,600,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
155,900,000
GBP
|
111,100,000
GBP
|
157 .5
GBP
|
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
1,000,000
GBP
|
1,500,000
GBP
|
— |
| Miscellaneous assets [abstract] | |||
| Investments other than investments accounted for using equity method |
1,000,000
GBP
|
1,000,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
246,300,000
GBP
|
286,300,000
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
2,400,000
GBP
|
8,400,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
108,900,000
GBP
|
92,200,000
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
100,000
GBP
|
100,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
9,600,000
GBP
|
9,600,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
1,749,100,000
GBP
|
1,747 .6
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
6,600,000
GBP
|
9,700,000
GBP
|
— |
| Reserve of gains and losses on hedging instruments that hedge investments in equity instruments |
700,000
GBP
|
900,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
400,000
GBP
|
400,000
GBP
|
— |
| Merger reserve |
1,400,000,000
GBP
|
1,400,000,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
889,800,000
GBP
|
952,400,000
GBP
|
— |
| Liabilities |
523,400,000
GBP
|
584,200,000
GBP
|
— |
| Assets (liabilities) |
366,400,000
GBP
|
368,200,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
410,900,000
GBP
|
437 .2
GBP
|
— |
| Current liabilities |
158,600,000
GBP
|
153,500,000
GBP
|
— |
| Assets less current liabilities [abstract] |