| Cash and equivalents | $m | 0.0Cash and equivalents, period not labelled, at 2020-09-30$38.0k. XBRL concept ifrs-full:CashAndCashEquivalents. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 9.9Cash and equivalents, FY2021, at 2021-09-30$9.9m. XBRL concept ifrs-full:CashAndCashEquivalents. 20-F filed 2025-03-20, accession 0000950170-25-042306.Report this figure | 7.0Cash and equivalents, FY2022, at 2022-09-30$7.0m. XBRL concept ifrs-full:CashAndCashEquivalents. 20-F filed 2025-03-20, accession 0000950170-25-042306.Report this figure | 5.8Cash and equivalents, Q1 FY2023, at 2022-12-31$5.8m. XBRL concept ifrs-full:CashAndCashEquivalents. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 1.4Cash and equivalents, FY2023, at 2023-12-31$1.4m. XBRL concept ifrs-full:CashAndCashEquivalents. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 2.3Cash and equivalents, FY2024, at 2024-12-31$2.3m. XBRL concept ifrs-full:CashAndCashEquivalents. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 12.4Cash and equivalents, FY2025, at 2025-12-31$12.4m. XBRL concept ifrs-full:CashAndCashEquivalents. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure |
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| Current assets | $m | 0.1Current assets, period not labelled, at 2020-09-30$53.9k. XBRL concept ifrs-full:CurrentAssets. 20-F filed 2021-12-23, accession 0001493152-21-032412.Report this figure | 13.3Current assets, FY2021, at 2021-09-30$13.3m. XBRL concept ifrs-full:CurrentAssets. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 17.0Current assets, FY2022, at 2022-09-30$17.0m. XBRL concept ifrs-full:CurrentAssets. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 11.5Current assets, Q1 FY2023, at 2022-12-31$11.5m. XBRL concept ifrs-full:CurrentAssets. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 5.5Current assets, FY2023, at 2023-12-31$5.5m. XBRL concept ifrs-full:CurrentAssets. 20-F filed 2025-03-20, accession 0000950170-25-042306.Report this figure | 5.9Current assets, FY2024, at 2024-12-31$5.9m. XBRL concept ifrs-full:CurrentAssets. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 22.5Current assets, FY2025, at 2025-12-31$22.5m. XBRL concept ifrs-full:CurrentAssets. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure |
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| Total assets | $m | 0.1Total assets, period not labelled, at 2020-09-30$55.5k. XBRL concept ifrs-full:Assets. 20-F filed 2021-12-23, accession 0001493152-21-032412.Report this figure | 279Total assets, FY2021, at 2021-09-30$279.5m. XBRL concept ifrs-full:Assets. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 689Total assets, FY2022, at 2022-09-30$688.6m. XBRL concept ifrs-full:Assets. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 682Total assets, Q1 FY2023, at 2022-12-31$682.4m. XBRL concept ifrs-full:Assets. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 691Total assets, FY2023, at 2023-12-31$691.0m. XBRL concept ifrs-full:Assets. 20-F filed 2025-03-20, accession 0000950170-25-042306.Report this figure | 738Total assets, FY2024, at 2024-12-31$737.5m. XBRL concept ifrs-full:Assets. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 823Total assets, FY2025, at 2025-12-31$822.8m. XBRL concept ifrs-full:Assets. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure |
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| Current liabilities | $m | 0.2Current liabilities, period not labelled, at 2020-09-30$196.4k. XBRL concept ifrs-full:CurrentLiabilities. 20-F filed 2021-12-23, accession 0001493152-21-032412.Report this figure | 6.9Current liabilities, FY2021, at 2021-09-30$6.9m. XBRL concept ifrs-full:CurrentLiabilities. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 7.2Current liabilities, FY2022, at 2022-09-30$7.2m. XBRL concept ifrs-full:CurrentLiabilities. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 4.0Current liabilities, Q1 FY2023, at 2022-12-31$4.0m. XBRL concept ifrs-full:CurrentLiabilities. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 3.9Current liabilities, FY2023, at 2023-12-31$3.9m. XBRL concept ifrs-full:CurrentLiabilities. 20-F filed 2025-03-20, accession 0000950170-25-042306.Report this figure | 3.9Current liabilities, FY2024, at 2024-12-31$3.9m. XBRL concept ifrs-full:CurrentLiabilities. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 4.6Current liabilities, FY2025, at 2025-12-31$4.6m. XBRL concept ifrs-full:CurrentLiabilities. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure |
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| Total liabilities | $m | 0.2Total liabilities, period not labelled, at 2020-09-30$196.4k. XBRL concept ifrs-full:Liabilities. 20-F filed 2021-12-23, accession 0001493152-21-032412.Report this figure | 54.2Total liabilities, FY2021, at 2021-09-30$54.2m. XBRL concept ifrs-full:Liabilities. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 152Total liabilities, FY2022, at 2022-09-30$152.4m. XBRL concept ifrs-full:Liabilities. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 149Total liabilities, Q1 FY2023, at 2022-12-31$148.8m. XBRL concept ifrs-full:Liabilities. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 170Total liabilities, FY2023, at 2023-12-31$170.0m. XBRL concept ifrs-full:Liabilities. 20-F filed 2025-03-20, accession 0000950170-25-042306.Report this figure | 179Total liabilities, FY2024, at 2024-12-31$179.2m. XBRL concept ifrs-full:Liabilities. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 124Total liabilities, FY2025, at 2025-12-31$123.6m. XBRL concept ifrs-full:Liabilities. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure |
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| Shareholders' equity | $m | (0.1)Shareholders' equity, period not labelled, at 2020-09-30−$141.0k. XBRL concept ifrs-full:Equity. 20-F filed 2024-03-28, accession 0000950170-24-037537.Report this figure | 225Shareholders' equity, FY2021, at 2021-09-30$225.3m. XBRL concept ifrs-full:Equity. 20-F filed 2025-03-20, accession 0000950170-25-042306.Report this figure | 536Shareholders' equity, FY2022, at 2022-09-30$536.2m. XBRL concept ifrs-full:Equity. 20-F filed 2025-03-20, accession 0000950170-25-042306.Report this figure | 534Shareholders' equity, Q1 FY2023, at 2022-12-31$533.7m. XBRL concept ifrs-full:Equity. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 521Shareholders' equity, FY2023, at 2023-12-31$521.0m. XBRL concept ifrs-full:Equity. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 558Shareholders' equity, FY2024, at 2024-12-31$558.3m. XBRL concept ifrs-full:Equity. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure | 699Shareholders' equity, FY2025, at 2025-12-31$699.2m. XBRL concept ifrs-full:Equity. 20-F filed 2026-03-19, accession 0001193125-26-114767.Report this figure |
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