Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-09-30 |
As at 2023-09-30 |
As at 2022-09-30 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
10,600,000
GBP
|
8,600,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
1,800,000
GBP
|
1,000,000
GBP
|
— |
| Investment property [abstract] | |||
| Investment property |
2,996,800,000
GBP
|
2,948,900,000
GBP
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in joint ventures reported in separate financial statements |
76,400,000
GBP
|
75,200,000
GBP
|
— |
| Investments in associates reported in separate financial statements |
14,900,000
GBP
|
15,800,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
6,500,000
GBP
|
9,600,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
90,900,000
GBP
|
34,000,000
GBP
|
— |
| Categories of non-current financial assets [abstract] | |||
| Non-current financial assets at fair value through profit or loss [abstract] | |||
| Non-current financial assets at fair value through profit or loss |
57,400,000
GBP
|
67,000,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
331,600,000
GBP
|
392,200,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
93,200,000
GBP
|
121,000,000
GBP
|
95,900,000
GBP
|
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
19,800,000
GBP
|
45,300,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
1,592,900,000
GBP
|
1,533,500,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other non-current payables [abstract] | |||
| Trade and other non-current payables |
6,300,000
GBP
|
6,900,000
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
114,100,000
GBP
|
120,700,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
37,200,000
GBP
|
37,200,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
1,013,800,000
GBP
|
1,033,200,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of cash flow hedges |
4,400,000
GBP
|
20,000,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
300,000
GBP
|
300,000
GBP
|
— |
| Merger reserve |
20,100,000
GBP
|
20,100,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
3,742,700,000
GBP
|
3,722,300,000
GBP
|
— |
| Liabilities |
1,849,000,000
GBP
|
1,793,700,000
GBP
|
— |
| Assets (liabilities) |
1,893,700,000
GBP
|
1,928,600,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
572,200,000
GBP
|
592,500,000
GBP
|
— |
| Current liabilities |
127,300,000
GBP
|
129,900,000
GBP
|
— |
| Assets less current liabilities [abstract] |