Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
2021-10-01 to 2022-09-30 |
As at 2022-09-30 |
As at 2021-09-30 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | — |
120,502,000
GBP
|
57,231,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities | — |
19,092,000
GBP
|
11,433,000
GBP
|
— | — |
| Cash flows from (used in) operating activities | — |
101,410,000
GBP
|
45,798,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||
| Purchase of property, plant and equipment, classified as investing activities | — |
1,574,000
GBP
|
1,014,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities | — |
1,926,000
GBP
|
2,365,000
GBP
|
— | — |
| Interest received, classified as investing activities | — |
2,393,000
GBP
|
198,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — |
1,107,000
GBP
|
3,181,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||
| Proceeds from issuing shares | — |
34,000
GBP
|
272,000
GBP
|
— | — |
| Payments to acquire or redeem entity's shares | — |
2,000,000
GBP
|
—
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities | — |
1,576,000
GBP
|
1,716,000
GBP
|
— | — |
| Dividends paid, classified as financing activities | — |
33,294,000
GBP
|
50,383,000
GBP
|
— | — |
| Interest paid, classified as financing activities | — |
952,000
GBP
|
768,000
GBP
|
— | — |
| Income taxes paid (refund), classified as financing activities | — |
241,000
GBP
|
—
GBP
|
— | — |
| Cash flows from (used in) financing activities | — |
38,029,000
GBP
|
52,595,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — |
62,274,000
GBP
|
9,978,000
GBP
|
— | — |
| Cash and cash equivalents |
146,304,000
GBP
|
— | — |
84,030,000
GBP
|
94,008,000
GBP
|