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 | — |
505,000,000
GBP
|
368,000,000
GBP
|
— | — |
| Interest paid, classified as operating activities | — |
33,000,000
GBP
|
21,000,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities | — |
85,000,000
GBP
|
62,000,000
GBP
|
— | — |
| Cash flows from (used in) operating activities | — |
387,000,000
GBP
|
285,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
–
GBP
|
42,000,000
GBP
|
— | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
26,000,000
GBP
|
285,000,000
GBP
|
— | — |
| Purchase of property, plant and equipment, classified as investing activities | — |
5,000,000
GBP
|
12,000,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities | — |
17,000,000
GBP
|
40,000,000
GBP
|
— | — |
| Interest received, classified as investing activities | — |
12,000,000
GBP
|
1,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — |
36,000,000
GBP
|
284,000,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares | — |
–
GBP
|
249,000,000
GBP
|
— | — |
| Payments of other equity instruments | — |
1,000,000
GBP
|
32,000,000
GBP
|
— | — |
| Proceeds from borrowings, classified as financing activities | — |
440,000,000
GBP
|
516,000,000
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities | — |
353,000,000
GBP
|
166,000,000
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities | — |
18,000,000
GBP
|
19,000,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — |
114,000,000
GBP
|
127,000,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
237,000,000
GBP
|
126,000,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
30,000,000
GBP
|
48,000,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — |
207,000,000
GBP
|
78,000,000
GBP
|
— | — |
| Cash and cash equivalents |
696,000,000
GBP
|
— | — |
489,000,000
GBP
|
567,000,000
GBP
|