Statement Of Financial Position [Abstract]
| Concept |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment |
3,378,000
GBP
|
— | — | — | — | — | — | — | — | — |
3,658,000
GBP
|
— | — | — | — | — | — | — |
| Goodwill |
38,586,000
GBP
|
— | — | — | — | — | — | — | — | — |
27,577,000
GBP
|
— | — | — | — | — | — | — |
| Intangible assets other than goodwill |
90,629,000
GBP
|
— | — | — | — | — | — | — | — | — |
75,171,000
GBP
|
— | — | — | — | — | — | — |
| Non-current assets |
132,593,000
GBP
|
— | — | — | — | — | — | — | — | — |
106,406,000
GBP
|
— | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Trade and other current receivables |
241,682,000
GBP
|
— | — | — | — | — | — | — | — | — |
235,496,000
GBP
|
— | — | — | — | — | — | — |
| Cash and cash equivalents |
121,037,000
GBP
|
— | — | — | — | — | — | — | — | — |
120,852,000
GBP
|
— | — | — | — |
71,898,000
GBP
|
— | — |
| Current assets |
372,640,000
GBP
|
— | — | — | — | — | — | — | — | — |
360,516,000
GBP
|
— | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital |
648,000
GBP
|
— | — | — | — | — | — | — | — | — |
612,000
GBP
|
— | — | — | — | — | — | — |
| Retained earnings |
121,341,000
GBP
|
— | — | — | — | — | — | — | — | — |
128,859,000
GBP
|
— | — | — | — | — | — | — |
| Share premium |
112,510,000
GBP
|
— | — | — | — | — | — | — | — | — |
64,370,000
GBP
|
— | — | — | — | — | — | — |
| Treasury shares |
13,537,000
GBP
|
— | — | — | — | — | — | — | — | — |
9,692,000
GBP
|
— | — | — | — | — | — | — |
| Equity |
220,981,000
GBP
|
112,510,000
GBP
|
648,000
GBP
|
13,537,000
GBP
|
19,000
GBP
|
121,341,000
GBP
|
19,000
GBP
|
612,000
GBP
|
64,370,000
GBP
|
128,859,000
GBP
|
184,168,000
GBP
|
9,692,000
GBP
|
19,000
GBP
|
5,818,000
GBP
|
104,207,000
GBP
|
163,388,000
GBP
|
610,000
GBP
|
64,370,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Deferred tax liabilities |
21,493,000
GBP
|
— | — | — | — | — | — | — | — | — |
16,601,000
GBP
|
— | — | — | — | — | — | — |
| Non-current liabilities |
23,661,000
GBP
|
— | — | — | — | — | — | — | — | — |
19,376,000
GBP
|
— | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Trade and other current payables |
255,460,000
GBP
|
— | — | — | — | — | — | — | — | — |
255,669,000
GBP
|
— | — | — | — | — | — | — |
| Current tax liabilities, current |
5,131,000
GBP
|
— | — | — | — | — | — | — | — | — |
7,709,000
GBP
|
— | — | — | — | — | — | — |
| Current liabilities |
260,591,000
GBP
|
— | — | — | — | — | — | — | — | — |
263,378,000
GBP
|
— | — | — | — | — | — | — |