Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-03-31 |
As at 2023-03-31 |
As at 2022-03-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
236,800,000
GBP
|
222,900,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
569,000,000
GBP
|
472,300,000
GBP
|
— |
| Goodwill |
1,211,000,000
GBP
|
1,120,500,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
32,000,000
GBP
|
38,400,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
460,900,000
GBP
|
410,700,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
304,800,000
GBP
|
312,400,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
142,400,000
GBP
|
168,500,000
GBP
|
156,700,000
GBP
|
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
700,000
GBP
|
1,500,000
GBP
|
— |
| Miscellaneous assets [abstract] | |||
| Cash and bank balances at central banks |
142,700,000
GBP
|
169,500,000
GBP
|
— |
| Classes of other provisions [abstract] | |||
| Other provisions [abstract] | |||
| Other non-current provisions |
10,700,000
GBP
|
9,700,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
711,900,000
GBP
|
677,300,000
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings and current portion of non-current borrowings |
300,000
GBP
|
1,000,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Current borrowings and current portion of non-current borrowings, by type [abstract] | |||
| Trade and other non-current payables [abstract] | |||
| Trade and other non-current payables |
23,900,000
GBP
|
21,900,000
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
296,500,000
GBP
|
280,700,000
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
1,100,000
GBP
|
500,000
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
2,600,000
GBP
|
900,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
38,000,000
GBP
|
38,000,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
1,604,500,000
GBP
|
1,415,800,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
126,300,000
GBP
|
162,300,000
GBP
|
— |
| Reserve of cash flow hedges |
1,300,000
GBP
|
600,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
200,000
GBP
|
200,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
2,999,900,000
GBP
|
2,788,400,000
GBP
|
— |
| Liabilities |
1,263,400,000
GBP
|
1,189,500,000
GBP
|
— |
| Assets (liabilities) |
1,736,500,000
GBP
|
1,598,900,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
911,700,000
GBP
|
895,600,000
GBP
|
— |
| Current liabilities |
372,100,000
GBP
|
341,200,000
GBP
|
— |
| Current assets (liabilities) |
539,600,000
GBP
|
554,400,000
GBP
|
— |
| Assets less current liabilities [abstract] |