Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-01-31 |
As at 2022-01-31 |
As at 2021-01-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
611,000,000
GBP
|
646,500,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
51,300,000
GBP
|
47,100,000
GBP
|
— |
| Goodwill |
449,600,000
GBP
|
718,600,000
GBP
|
— |
| Trade and other receivables [abstract] | |||
| Trade and other receivables |
212,500,000
GBP
|
169,500,000
GBP
|
— |
| Categories of financial assets [abstract] | |||
| Financial assets |
282,400,000
GBP
|
332,100,000
GBP
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
191,700,000
GBP
|
255,700,000
GBP
|
166,900,000
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 |
31,200,000
GBP
|
12,900,000
GBP
|
— |
| Miscellaneous assets [abstract] | |||
| Net defined benefit asset |
–
GBP
|
1,100,000
GBP
|
— |
| Trade and other payables [abstract] | |||
| Accruals and deferred income including contract liabilities [abstract] | |||
| Deferred income including contract liabilities [abstract] | |||
| Contract liabilities [abstract] | |||
| Contract liabilities |
122,200,000
GBP
|
114,600,000
GBP
|
— |
| Trade and other payables |
197,700,000
GBP
|
199,700,000
GBP
|
— |
| Categories of financial liabilities [abstract] | |||
| Financial liabilities |
896,800,000
GBP
|
936,200,000
GBP
|
— |
| Miscellaneous liabilities [abstract] | |||
| Net defined benefit liability |
12,100,000
GBP
|
–
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
21,100,000
GBP
|
21,100,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
293,500,000
GBP
|
22,400,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of cash flow hedges |
3,200,000
GBP
|
700,000
GBP
|
— |
| Reserve of gains and losses on financial assets measured at fair value through other comprehensive income |
12,100,000
GBP
|
800,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Reserve of share-based payments |
8,900,000
GBP
|
7,400,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
1,977,700,000
GBP
|
2,302,400,000
GBP
|
— |
| Liabilities |
1,608,200,000
GBP
|
1,649,500,000
GBP
|
— |
| Assets less current liabilities [abstract] |