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 |
1,430,513,000
GBP
|
1,354,806,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
946,798,000
GBP
|
928,009,000
GBP
|
| Goodwill |
2,190,147,000
GBP
|
2,029,620,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
32,825,000
GBP
|
47,789,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current derivative financial assets |
42,760,000
GBP
|
89,199,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
2,172,422,000
GBP
|
2,312,269,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
1,072,061,000
GBP
|
1,192,803,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash equivalents [abstract] | ||
| Short-term deposits, classified as cash equivalents |
1,109,446,000
GBP
|
1,421,749,000
GBP
|
| Cash and cash equivalents |
1,109,446,000
GBP
|
1,421,749,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
55,064,000
GBP
|
59,258,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
1,574,775,000
GBP
|
1,933,759,000
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
368,743,000
GBP
|
320,856,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other non-current payables [abstract] | ||
| Non-current accruals and non-current deferred income including non-current contract liabilities [abstract] | ||
| Non-current deferred income including non-current contract liabilities [abstract] | ||
| Non-current deferred income other than non-current contract liabilities | — | — |
| Non-current government grants |
2,704,000
GBP
|
446,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
3,054,108,000
GBP
|
3,279,898,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
6,557,000
GBP
|
11,721,000
GBP
|
| Non-current derivative financial liabilities |
27,536,000
GBP
|
40,585,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
20,914,000
GBP
|
42,341,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
17,422,000
GBP
|
17,422,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
2,078,568,000
GBP
|
1,941,223,000
GBP
|
| Accumulated other comprehensive income [abstract] | ||
| Reserve of exchange differences on translation |
64,873,000
GBP
|
128,529,000
GBP
|
| Reserve of cash flow hedges |
18,100,000
GBP
|
48,280,000
GBP
|
| Miscellaneous equity [abstract] | ||
| Reserve of share-based payments |
63,806,000
GBP
|
54,596,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
9,483,219,000
GBP
|
9,840,776,000
GBP
|
| Liabilities |
6,300,187,000
GBP
|
6,782,466,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
4,408,993,000
GBP
|
4,986,079,000
GBP
|
| Current liabilities |
3,739,166,000
GBP
|
3,893,147,000
GBP
|
| Assets less current liabilities [abstract] |