Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-03-31 |
As at 2021-03-31 |
As at 2020-03-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
32,700,000
GBP
|
32,800,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
12,200,000
GBP
|
15,600,000
GBP
|
— |
| Goodwill |
28,200,000
GBP
|
28,200,000
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
92,400,000
GBP
|
85,300,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
169,700,000
GBP
|
166,200,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
97,000,000
GBP
|
139,600,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
19,500,000
GBP
|
67,100,000
GBP
|
6,900,000
GBP
|
| Borrowings [abstract] | |||
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
45,000,000
GBP
|
–
GBP
|
— |
| Trade and other non-current payables [abstract] | |||
| Trade and other non-current payables |
6,400,000
GBP
|
7,900,000
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
313,900,000
GBP
|
411,400,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
1,200,000
GBP
|
1,200,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
60,700,000
GBP
|
33,100,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
549,200,000
GBP
|
615,700,000
GBP
|
— |
| Liabilities |
476,800,000
GBP
|
519,300,000
GBP
|
— |
| Assets (liabilities) |
72,400,000
GBP
|
96,400,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
288,100,000
GBP
|
373,900,000
GBP
|
— |
| Current liabilities |
379,600,000
GBP
|
432,900,000
GBP
|
— |
| Current assets (liabilities) |
91,500,000
GBP
|
59,000,000
GBP
|
— |
| Assets less current liabilities [abstract] |