Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
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 |
517,100,000
GBP
|
478,500,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
148,800,000
GBP
|
140,800,000
GBP
|
| Goodwill |
780,100,000
GBP
|
781,400,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
59,700,000
GBP
|
57,400,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Non-current receivables due from related parties |
3,900,000
GBP
|
9,500,000
GBP
|
| Trade and other non-current receivables |
13,000,000
GBP
|
6,400,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
107,300,000
GBP
|
94,800,000
GBP
|
| Non-current derivative financial assets |
2,800,000
GBP
|
2,600,000
GBP
|
| Non-current finance lease receivables |
22,500,000
GBP
|
22,200,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
487,200,000
GBP
|
506,900,000
GBP
|
| Current prepayments and current accrued income including current contract assets [abstract] | ||
| Current accrued income including current contract assets [abstract] | ||
| Current contract assets |
337,400,000
GBP
|
322,500,000
GBP
|
| Categories of non-current financial assets [abstract] | ||
| Non-current financial assets |
5,300,000
GBP
|
7,300,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
187,400,000
GBP
|
126,800,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
570,600,000
GBP
|
451,700,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
4,400,000
GBP
|
4,300,000
GBP
|
| Current finance lease receivables |
13,000,000
GBP
|
16,400,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
747,100,000
GBP
|
768,400,000
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
20,400,000
GBP
|
19,600,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other non-current payables [abstract] | ||
| Trade and other non-current payables |
5,400,000
GBP
|
900,000
GBP
|
| Trade and other current payables [abstract] | ||
| Current accruals and current deferred income including current contract liabilities [abstract] | ||
| Current deferred income including current contract liabilities [abstract] | ||
| Current contract liabilities [abstract] | ||
| Current contract liabilities |
761,800,000
GBP
|
616,400,000
GBP
|
| Trade and other current payables |
949,200,000
GBP
|
911,100,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
217,000,000
GBP
|
156,200,000
GBP
|
| Non-current derivative financial liabilities |
51,900,000
GBP
|
53,300,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
9,500,000
GBP
|
12,800,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
303,400,000
GBP
|
303,400,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
1,523,900,000
GBP
|
1,568,800,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
3,580,100,000
GBP
|
3,309,900,000
GBP
|
| Liabilities |
3,174,000,000
GBP
|
2,939,000,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
1,611,700,000
GBP
|
1,437,700,000
GBP
|
| Current liabilities |
1,881,200,000
GBP
|
1,693,500,000
GBP
|
| Assets less current liabilities [abstract] |