Statement Of Cash Flows [Abstract]
| Concept |
2021-10-01 to 2022-09-30 |
As at 2022-09-30 |
As at 2021-10-01 |
As at 2021-09-30 |
2020-10-01 to 2021-09-30 |
As at 2020-10-01 |
|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||
| Cash flows from (used in) operating activities [abstract] | ||||||
| Cash flows from (used in) operating activities |
1,168,700,000
GBP
|
— | — | — |
878,100,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||
| Cash flows from (used in) investing activities |
2,400,000
GBP
|
— | — | — |
4,300,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||
| Cash flows from (used in) financing activities |
595,600,000
GBP
|
— | — | — |
1,438,600,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes |
570,700,000
GBP
|
— | — | — |
564,800,000
GBP
|
— |
| Cash and cash equivalents | — |
1,930,500,000
GBP
|
1,359,800,000
GBP
|
1,359,800,000
GBP
|
— |
1,924,600,000
GBP
|