Statement Of Cash Flows [Abstract]
| Concept |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2021-10-01 to 2022-09-30 |
As at 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
As at 2021-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
25,600,000
GBP
|
25,600,000
GBP
|
–
GBP
|
229,400,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
229,400,000
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||
| Adjustments for income tax expense | — | — | — | — | — |
1,800,000
GBP
|
— | — |
69,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for decrease (increase) in inventories | — | — | — | — | — |
61,600,000
GBP
|
— | — |
24,800,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for depreciation and amortisation expense | — | — | — | — | — |
1,100,000
GBP
|
— | — |
900,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for provisions | — | — | — | — | — |
–
GBP
|
— | — |
8,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for share-based payments | — | — | — | — | — |
2,400,000
GBP
|
— | — |
1,700,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for losses (gains) on disposal of non-current assets | — | — | — | — | — |
3,300,000
GBP
|
— | — |
1,700,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) operations | — | — | — | — | — |
229,200,000
GBP
|
— | — |
156,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Interest paid, classified as operating activities | — | — | — | — | — |
46,900,000
GBP
|
— | — |
42,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — |
2,700,000
GBP
|
— | — |
12,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — | — | — |
184,700,000
GBP
|
— | — |
102,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||
| Other cash payments to acquire interests in joint ventures, classified as investing activities | — | — | — | — | — |
34,000,000
GBP
|
— | — |
6,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — |
274,100,000
GBP
|
— | — |
274,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||
| Payments to acquire or redeem entity's shares | — | — | — | — | — |
7,900,000
GBP
|
— | — |
3,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Proceeds from borrowings, classified as financing activities | — | — | — | — | — |
330,000,000
GBP
|
— | — |
14,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — | — | — |
155,000,000
GBP
|
— | — |
900,000
GBP
|
— | — | — | — | — | — | — | — |
| Dividends paid, classified as financing activities | — | — | — | — | — |
45,700,000
GBP
|
— | — |
40,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — |
114,500,000
GBP
|
— | — |
49,500,000
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — | — | — | — |
25,100,000
GBP
|
— | — |
221,700,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
121,000,000
GBP
|
— | — | — | — | — |
95,900,000
GBP
|
— | — | — | — | — | — |
317,600,000
GBP
|