Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2025-03-31 |
As at 2024-03-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
1,262,386,000
GBP
|
1,430,513,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
696,819,000
GBP
|
946,798,000
GBP
|
| Goodwill |
1,716,684,000
GBP
|
2,190,147,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
71,428,000
GBP
|
32,825,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current derivative financial assets |
24,871,000
GBP
|
42,760,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
1,975,444,000
GBP
|
2,172,422,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
940,159,000
GBP
|
1,072,061,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash equivalents [abstract] | ||
| Short-term deposits, classified as cash equivalents |
1,088,175,000
GBP
|
1,109,446,000
GBP
|
| Cash and cash equivalents |
1,088,175,000
GBP
|
1,109,446,000
GBP
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | ||
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners |
1,070,864,000
GBP
|
–
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
25,321,000
GBP
|
55,064,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
1,849,217,000
GBP
|
1,574,775,000
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
116,825,000
GBP
|
368,743,000
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 |
2,513,000
GBP
|
2,704,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
2,763,181,000
GBP
|
3,054,108,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
5,884,000
GBP
|
6,557,000
GBP
|
| Non-current derivative financial liabilities |
19,224,000
GBP
|
27,536,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
11,348,000
GBP
|
20,914,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
17,422,000
GBP
|
17,422,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
2,087,407,000
GBP
|
2,078,568,000
GBP
|
| Accumulated other comprehensive income [abstract] | ||
| Reserve of exchange differences on translation |
10,324,000
GBP
|
64,873,000
GBP
|
| Reserve of cash flow hedges |
2,083,000
GBP
|
18,100,000
GBP
|
| Miscellaneous equity [abstract] | ||
| Reserve of share-based payments |
71,350,000
GBP
|
63,806,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
9,257,629,000
GBP
|
9,483,219,000
GBP
|
| Liabilities |
6,089,333,000
GBP
|
6,300,187,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
5,099,963,000
GBP
|
4,408,993,000
GBP
|
| Current liabilities |
3,371,876,000
GBP
|
3,739,166,000
GBP
|
| Assets less current liabilities [abstract] |