Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
1 5, 395 .9
GBP
|
14 ,61 2. 8
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Other non-current receivables |
14 9. 5
GBP
|
1 36.4
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
5 41 . 1
GBP
|
58 4 .9
GBP
|
— |
| Non-current derivative financial assets |
24 6 .0
GBP
|
371 .7
GBP
|
— |
| Non-current investments other than investments accounted for using equity method |
2 7. 4
GBP
|
8,700,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
3 , 24 5 . 1
GBP
|
2, 21 1 .0
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
394,900,000
GBP
|
26 6 .6
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
891 . 8
GBP
|
1,0 4 9. 3
GBP
|
1,6 00. 2
GBP
|
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
75 9. 2
GBP
|
2,9 41 . 8
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
7, 2 3 9 . 3
GBP
|
7, 8 7 3 . 9
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings and current portion of non-current borrowings |
1 , 820.6
GBP
|
1,190,800,000
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 |
9 59. 9
GBP
|
8 42.4
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
2,6 58 .6
GBP
|
2,67 2.6
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current derivative financial liabilities |
1 ,021 .0
GBP
|
5 49. 6
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
24 3. 3
GBP
|
701 . 5
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
5 4 7. 0
GBP
|
536,500,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
6, 68 9. 8
GBP
|
6 , 57 2 .9
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
32 . 1
GBP
|
6 .6
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
52 .6
GBP
|
4 9. 2
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
2 7, 1 3 8 . 4
GBP
|
25,755 . 5
GBP
|
— |
| Liabilities |
16,0 23 .0
GBP
|
16, 58 6 . 1
GBP
|
— |
| Assets (liabilities) |
11 ,115.4
GBP
|
9,16 9.4
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
5 ,76 5 . 8
GBP
|
6 ,93 6 . 8
GBP
|
— |
| Current liabilities |
4 , 761 . 0
GBP
|
4,65 8. 2
GBP
|
— |
| Assets less current liabilities [abstract] |