| Cash and equivalents | $m | 6.8Cash and equivalents, period not labelled, at 2019-03-31$6.8m. XBRL concept ifrs-full:CashAndCashEquivalents. 40-F/A filed 2021-10-22, accession 0001062993-21-009809.Report this figure | 5.1Cash and equivalents, period not labelled, at 2020-03-31$5.1m. XBRL concept ifrs-full:CashAndCashEquivalents. 40-F filed 2022-07-22, accession 0001062993-22-016645.Report this figure | 40.3Cash and equivalents, FY2021, at 2021-03-31$40.3m. XBRL concept ifrs-full:CashAndCashEquivalents. 40-F filed 2023-06-30, accession 0001062993-23-014191.Report this figure | 5.3Cash and equivalents, FY2022, at 2022-03-31$5.3m. XBRL concept ifrs-full:CashAndCashEquivalents. 40-F filed 2024-06-24, accession 0001062993-24-012996.Report this figure | 4.4Cash and equivalents, FY2023, at 2023-03-31$4.4m. XBRL concept ifrs-full:CashAndCashEquivalents. 40-F filed 2024-06-24, accession 0001062993-24-012996.Report this figure | 9.7Cash and equivalents, FY2024, at 2024-03-31$9.7m. XBRL concept us-gaap:Cash. 40-F filed 2025-06-26, accession 0001062993-25-012159.Report this figure | 23.4Cash and equivalents, FY2025, at 2025-03-31$23.4m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-K filed 2026-06-02, accession 0001062993-26-002973.Report this figure | not reported | 23.1Cash and equivalents, FY2026, at 2026-03-31$23.1m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure | 208Cash and equivalents, Q1 FY2027, at 2026-06-30$208.0m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure |
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| Current assets | $m | not reported | 18.3Current assets, period not labelled, at 2020-03-31$18.3m. XBRL concept ifrs-full:CurrentAssets. 40-F/A filed 2021-10-22, accession 0001062993-21-009809.Report this figure | 108Current assets, FY2021, at 2021-03-31$107.5m. XBRL concept ifrs-full:CurrentAssets. 40-F filed 2022-07-22, accession 0001062993-22-016645.Report this figure | 199Current assets, FY2022, at 2022-03-31$199.1m. XBRL concept ifrs-full:CurrentAssets. 40-F filed 2023-06-30, accession 0001062993-23-014191.Report this figure | 82.5Current assets, FY2023, at 2023-03-31$82.5m. XBRL concept ifrs-full:CurrentAssets. 40-F filed 2024-06-24, accession 0001062993-24-012996.Report this figure | 185Current assets, FY2024, at 2024-03-31$185.2m. XBRL concept us-gaap:AssetsCurrent. 40-F filed 2025-06-26, accession 0001062993-25-012159.Report this figure | 242Current assets, FY2025, at 2025-03-31$241.7m. XBRL concept us-gaap:AssetsCurrent. 10-K filed 2026-06-02, accession 0001062993-26-002973.Report this figure | not reported | 59.8Current assets, FY2026, at 2026-03-31$59.8m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure | 280Current assets, Q1 FY2027, at 2026-06-30$280.0m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure |
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| Total assets | $m | not reported | 29.1Total assets, period not labelled, at 2020-03-31$29.1m. XBRL concept ifrs-full:Assets. 40-F/A filed 2021-10-22, accession 0001062993-21-009809.Report this figure | 178Total assets, FY2021, at 2021-03-31$178.3m. XBRL concept ifrs-full:Assets. 40-F filed 2022-07-22, accession 0001062993-22-016645.Report this figure | 452Total assets, FY2022, at 2022-03-31$452.3m. XBRL concept ifrs-full:Assets. 40-F filed 2023-06-30, accession 0001062993-23-014191.Report this figure | 196Total assets, FY2023, at 2023-03-31$196.1m. XBRL concept ifrs-full:Assets. 40-F filed 2024-06-24, accession 0001062993-24-012996.Report this figure | 307Total assets, FY2024, at 2024-03-31$306.7m. XBRL concept us-gaap:Assets. 40-F filed 2025-06-26, accession 0001062993-25-012159.Report this figure | 532Total assets, FY2025, at 2025-03-31$531.6m. XBRL concept us-gaap:Assets. 10-K filed 2026-06-02, accession 0001062993-26-002973.Report this figure | not reported | 639Total assets, FY2026, at 2026-03-31$639.1m. XBRL concept us-gaap:Assets. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure | 925Total assets, Q1 FY2027, at 2026-06-30$924.6m. XBRL concept us-gaap:Assets. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure |
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| Current liabilities | $m | not reported | 7.2Current liabilities, period not labelled, at 2020-03-31$7.2m. XBRL concept ifrs-full:CurrentLiabilities. 40-F/A filed 2021-10-22, accession 0001062993-21-009809.Report this figure | 9.9Current liabilities, FY2021, at 2021-03-31$9.9m. XBRL concept ifrs-full:CurrentLiabilities. 40-F filed 2022-07-22, accession 0001062993-22-016645.Report this figure | 26.2Current liabilities, FY2022, at 2022-03-31$26.2m. XBRL concept ifrs-full:CurrentLiabilities. 40-F filed 2023-06-30, accession 0001062993-23-014191.Report this figure | 23.1Current liabilities, FY2023, at 2023-03-31$23.1m. XBRL concept ifrs-full:CurrentLiabilities. 40-F filed 2024-06-24, accession 0001062993-24-012996.Report this figure | 27.1Current liabilities, FY2024, at 2024-03-31$27.1m. XBRL concept us-gaap:LiabilitiesCurrent. 40-F filed 2025-06-26, accession 0001062993-25-012159.Report this figure | 66.0Current liabilities, FY2025, at 2025-03-31$66.0m. XBRL concept us-gaap:LiabilitiesCurrent. 10-K filed 2026-06-02, accession 0001062993-26-002973.Report this figure | not reported | 54.4Current liabilities, FY2026, at 2026-03-31$54.4m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure | 143Current liabilities, Q1 FY2027, at 2026-06-30$143.1m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure |
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| Total liabilities | $m | not reported | 8.0Total liabilities, period not labelled, at 2020-03-31$8.0m. XBRL concept ifrs-full:Liabilities. 40-F/A filed 2021-10-22, accession 0001062993-21-009809.Report this figure | 50.2Total liabilities, FY2021, at 2021-03-31$50.2m. XBRL concept ifrs-full:Liabilities. 40-F filed 2022-07-22, accession 0001062993-22-016645.Report this figure | 63.2Total liabilities, FY2022, at 2022-03-31$63.2m. XBRL concept ifrs-full:Liabilities. 40-F filed 2023-06-30, accession 0001062993-23-014191.Report this figure | 47.3Total liabilities, FY2023, at 2023-03-31$47.3m. XBRL concept ifrs-full:Liabilities. 40-F filed 2024-06-24, accession 0001062993-24-012996.Report this figure | 47.3Total liabilities, FY2024, at 2024-03-31$47.3m. XBRL concept us-gaap:Liabilities. 40-F filed 2025-06-26, accession 0001062993-25-012159.Report this figure | 82.5Total liabilities, FY2025, at 2025-03-31$82.5m. XBRL concept us-gaap:Liabilities. 10-K filed 2026-06-02, accession 0001062993-26-002973.Report this figure | not reported | 110Total liabilities, FY2026, at 2026-03-31$109.8m. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure | 502Total liabilities, Q1 FY2027, at 2026-06-30$501.9m. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure |
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| Short-term borrowings | $m | not reported | not reported | not reported | not reported | not reported | 5.6Short-term borrowings, FY2024, at 2024-03-31$5.6m. XBRL concept us-gaap:ShortTermBorrowings. 40-F filed 2025-06-26, accession 0001062993-25-012159.Report this figure | 3.6Short-term borrowings, FY2025, at 2025-03-31$3.6m. XBRL concept us-gaap:ShortTermBorrowings. 10-K filed 2026-06-02, accession 0001062993-26-002973.Report this figure | not reported | 2.0Short-term borrowings, FY2026, at 2026-03-31$2.0m. XBRL concept us-gaap:ShortTermBorrowings. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure | 1.6Short-term borrowings, Q1 FY2027, at 2026-06-30$1.6m. XBRL concept us-gaap:ShortTermBorrowings. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure |
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| Shareholders' equity | $m | 21.9Shareholders' equity, period not labelled, at 2019-03-31$21.9m. XBRL concept ifrs-full:Equity. 40-F/A filed 2021-10-22, accession 0001062993-21-009809.Report this figure | 21.1Shareholders' equity, period not labelled, at 2020-03-31$21.1m. XBRL concept ifrs-full:Equity. 40-F filed 2022-07-22, accession 0001062993-22-016645.Report this figure | 128Shareholders' equity, FY2021, at 2021-03-31$128.2m. XBRL concept ifrs-full:Equity. 40-F filed 2023-06-30, accession 0001062993-23-014191.Report this figure | 389Shareholders' equity, FY2022, at 2022-03-31$389.1m. XBRL concept ifrs-full:Equity. 40-F filed 2024-06-24, accession 0001062993-24-012996.Report this figure | 148Shareholders' equity, FY2023, at 2023-03-31$148.1m. XBRL concept us-gaap:StockholdersEquity. 10-K filed 2026-06-02, accession 0001062993-26-002973.Report this figure | 259Shareholders' equity, FY2024, at 2024-03-31$259.4m. XBRL concept us-gaap:StockholdersEquity. 10-K filed 2026-06-02, accession 0001062993-26-002973.Report this figure | 449Shareholders' equity, FY2025, at 2025-03-31$449.1m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure | 561Shareholders' equity, period not labelled, at 2025-06-30$560.5m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure | 529Shareholders' equity, FY2026, at 2026-03-31$529.4m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure | 423Shareholders' equity, Q1 FY2027, at 2026-06-30$422.7m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-14, accession 0001062993-26-004434.Report this figure |
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