Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-06-30 |
As at 2022-06-30 |
As at 2021-06-30 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
97,500,000
GBP
|
113,100,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
456,800,000
GBP
|
493,600,000
GBP
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in subsidiaries reported in separate financial statements |
–
GBP
|
–
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Other current receivables |
29,100,000
GBP
|
34,200,000
GBP
|
— |
| Trade and other receivables [abstract] | |||
| Other receivables |
6,200,000
GBP
|
6,700,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
2,200,000
GBP
|
2,300,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash equivalents [abstract] | |||
| Short-term deposits, classified as cash equivalents |
60,000,000
GBP
|
95,700,000
GBP
|
— |
| Cash and cash equivalents |
58,500,000
GBP
|
95,700,000
GBP
|
68,700,000
GBP
|
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
–
GBP
|
44,100,000
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
63,700,000
GBP
|
33,900,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
126,100,000
GBP
|
131,100,000
GBP
|
— |
| Miscellaneous liabilities [abstract] | |||
| Net defined benefit liability |
3,400,000
GBP
|
3,600,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
65,000,000
GBP
|
65,000,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
61,600,000
GBP
|
156,500,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
14,000,000
GBP
|
14,600,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
33,400,000
GBP
|
33,400,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
738,400,000
GBP
|
856,700,000
GBP
|
— |
| Liabilities |
408,400,000
GBP
|
431,600,000
GBP
|
— |
| Assets (liabilities) |
330,000,000
GBP
|
425,100,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
106,200,000
GBP
|
140,300,000
GBP
|
— |
| Current liabilities |
245,000,000
GBP
|
216,500,000
GBP
|
— |
| Current assets (liabilities) |
138,800,000
GBP
|
76,200,000
GBP
|
— |
| Assets less current liabilities [abstract] |