Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2025-03-31 |
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 |
283,200,000
GBP
|
236,800,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
576,000,000
GBP
|
569,000,000
GBP
|
— |
| Goodwill |
1,263,300,000
GBP
|
1,211,000,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
4,000,000
GBP
|
32,000,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
485,900,000
GBP
|
460,900,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
300,300,000
GBP
|
304,800,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
312,700,000
GBP
|
142,400,000
GBP
|
168,500,000
GBP
|
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
1,100,000
GBP
|
700,000
GBP
|
— |
| Miscellaneous assets [abstract] | |||
| Cash and bank balances at central banks |
313,200,000
GBP
|
142,700,000
GBP
|
— |
| Classes of other provisions [abstract] | |||
| Other provisions [abstract] | |||
| Other non-current provisions |
11,200,000
GBP
|
10,700,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
703,800,000
GBP
|
711,900,000
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings and current portion of non-current borrowings |
35,600,000
GBP
|
300,000
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 |
24,500,000
GBP
|
23,900,000
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
343,300,000
GBP
|
296,500,000
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
2,000,000
GBP
|
1,100,000
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
800,000
GBP
|
2,600,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
38,000,000
GBP
|
38,000,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
1,792,400,000
GBP
|
1,604,500,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
88,500,000
GBP
|
126,300,000
GBP
|
— |
| Reserve of cash flow hedges |
300,000
GBP
|
1,300,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
200,000
GBP
|
200,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
3,258,600,000
GBP
|
2,999,900,000
GBP
|
— |
| Liabilities |
1,359,200,000
GBP
|
1,263,400,000
GBP
|
— |
| Assets (liabilities) |
1,899,400,000
GBP
|
1,736,500,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
1,115,200,000
GBP
|
911,700,000
GBP
|
— |
| Current liabilities |
457,800,000
GBP
|
372,100,000
GBP
|
— |
| Current assets (liabilities) |
657,400,000
GBP
|
539,600,000
GBP
|
— |
| Assets less current liabilities [abstract] |