Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-01-31 |
As at 2023-01-31 |
As at 2022-02-01 |
As at 2022-01-31 |
|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||
| Property, plant and equipment [abstract] | ||||
| Property, plant and equipment |
593,400,000
GBP
|
611,000,000
GBP
|
646,500,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | ||||
| Intangible assets other than goodwill [abstract] | ||||
| Intangible assets other than goodwill |
60,700,000
GBP
|
51,300,000
GBP
|
47,100,000
GBP
|
— |
| Goodwill |
344,700,000
GBP
|
449,600,000
GBP
|
718,600,000
GBP
|
— |
| Trade and other receivables [abstract] | ||||
| Trade and other receivables |
127,700,000
GBP
|
136,000,000
GBP
|
115,600,000
GBP
|
— |
| Categories of financial assets [abstract] | ||||
| Financial assets |
252,200,000
GBP
|
282,400,000
GBP
|
332,100,000
GBP
|
— |
| Cash and cash equivalents [abstract] | ||||
| Cash and cash equivalents |
219,600,000
GBP
|
191,700,000
GBP
|
— |
255,700,000
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 |
17,400,000
GBP
|
31,200,000
GBP
|
12,900,000
GBP
|
— |
| Miscellaneous assets [abstract] | ||||
| Net defined benefit asset |
–
GBP
|
–
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 |
159,800,000
GBP
|
126,500,000
GBP
|
118,100,000
GBP
|
— |
| Trade and other payables |
201,300,000
GBP
|
186,500,000
GBP
|
187,300,000
GBP
|
— |
| Categories of financial liabilities [abstract] | ||||
| Financial liabilities |
828,400,000
GBP
|
896,800,000
GBP
|
936,200,000
GBP
|
— |
| Miscellaneous liabilities [abstract] | ||||
| Net defined benefit liability |
47,900,000
GBP
|
12,100,000
GBP
|
–
GBP
|
— |
| Issued capital [abstract] | ||||
| Issued capital |
21,300,000
GBP
|
21,100,000
GBP
|
21,100,000
GBP
|
— |
| Retained earnings [abstract] | ||||
| Retained earnings |
452,500,000
GBP
|
309,700,000
GBP
|
24,700,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | ||||
| Reserve of cash flow hedges |
2,900,000
GBP
|
3,200,000
GBP
|
700,000
GBP
|
— |
| Miscellaneous equity [abstract] | ||||
| Reserve of share-based payments |
10,500,000
GBP
|
8,900,000
GBP
|
7,400,000
GBP
|
— |
| Net assets (liabilities) [abstract] | ||||
| Assets |
1,882,800,000
GBP
|
1,949,300,000
GBP
|
2,266,900,000
GBP
|
— |
| Liabilities |
1,659,300,000
GBP
|
1,583,900,000
GBP
|
1,615,500,000
GBP
|
— |
| Assets less current liabilities [abstract] |