Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
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 |
1,354,806,000
GBP
|
1,253,349,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
928,009,000
GBP
|
868,488,000
GBP
|
| Goodwill |
2,029,620,000
GBP
|
1,765,961,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
47,789,000
GBP
|
26,843,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current derivative financial assets |
89,199,000
GBP
|
118,578,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
2,312,269,000
GBP
|
2,508,613,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
1,192,803,000
GBP
|
1,133,666,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash equivalents [abstract] | ||
| Short-term deposits, classified as cash equivalents |
1,421,749,000
GBP
|
1,394,272,000
GBP
|
| Cash and cash equivalents |
1,421,749,000
GBP
|
1,394,272,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
59,258,000
GBP
|
107,361,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
1,933,759,000
GBP
|
1,933,482,000
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
320,856,000
GBP
|
67,668,000
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 |
446,000
GBP
|
356,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
3,279,898,000
GBP
|
3,468,705,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
11,721,000
GBP
|
7,745,000
GBP
|
| Non-current derivative financial liabilities |
40,585,000
GBP
|
10,330,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
42,341,000
GBP
|
28,634,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
17,422,000
GBP
|
17,422,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
1,941,223,000
GBP
|
1,783,033,000
GBP
|
| Accumulated other comprehensive income [abstract] | ||
| Reserve of exchange differences on translation |
128,529,000
GBP
|
87,272,000
GBP
|
| Reserve of cash flow hedges |
48,280,000
GBP
|
85,768,000
GBP
|
| Miscellaneous equity [abstract] | ||
| Reserve of share-based payments |
54,596,000
GBP
|
47,436,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
9,840,776,000
GBP
|
9,559,176,000
GBP
|
| Liabilities |
6,782,466,000
GBP
|
6,588,613,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
4,986,079,000
GBP
|
5,143,912,000
GBP
|
| Current liabilities |
3,893,147,000
GBP
|
3,762,389,000
GBP
|
| Assets less current liabilities [abstract] |