| Cash and equivalents | $m | not reported | not reported | 9.4Cash and equivalents, period not labelled, at 2025-04-30$9.4m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-K filed 2026-07-28, accession 0001193125-26-321135.Report this figure | not reported | 242Cash and equivalents, FY2026, at 2026-04-30$242.0m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-K filed 2026-07-28, accession 0001193125-26-321135.Report this figure | 54.1Cash and equivalents, Q1 FY2027, at 2026-07-31$54.1m. XBRL concept us-gaap:CashAndCashEquivalentsAtCarryingValue. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure |
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| Current assets | $m | not reported | not reported | 173Current assets, period not labelled, at 2025-04-30$172.6m. XBRL concept us-gaap:AssetsCurrent. 10-K filed 2026-07-28, accession 0001193125-26-321135.Report this figure | not reported | 329Current assets, FY2026, at 2026-04-30$329.3m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure | 121Current assets, Q1 FY2027, at 2026-07-31$120.8m. XBRL concept us-gaap:AssetsCurrent. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure |
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| Total assets | $m | not reported | not reported | 216Total assets, period not labelled, at 2025-04-30$216.1m. XBRL concept us-gaap:Assets. 10-K filed 2026-07-28, accession 0001193125-26-321135.Report this figure | not reported | 373Total assets, FY2026, at 2026-04-30$373.3m. XBRL concept us-gaap:Assets. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure | 1,912Total assets, Q1 FY2027, at 2026-07-31$1.91bn. XBRL concept us-gaap:Assets. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure |
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| Current liabilities | $m | not reported | not reported | 0.7Current liabilities, period not labelled, at 2025-04-30$739.0k. XBRL concept us-gaap:LiabilitiesCurrent. 10-K filed 2026-07-28, accession 0001193125-26-321135.Report this figure | not reported | 55.5Current liabilities, FY2026, at 2026-04-30$55.5m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure | 138Current liabilities, Q1 FY2027, at 2026-07-31$138.0m. XBRL concept us-gaap:LiabilitiesCurrent. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure |
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| Total liabilities | $m | not reported | not reported | 1.0Total liabilities, period not labelled, at 2025-04-30$1.0m. XBRL concept us-gaap:Liabilities. 10-K filed 2026-07-28, accession 0001193125-26-321135.Report this figure | not reported | 60.6Total liabilities, FY2026, at 2026-04-30$60.5m. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure | 820Total liabilities, Q1 FY2027, at 2026-07-31$819.5m. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure |
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| Long-term debt | $m | not reported | not reported | not reported | not reported | 0.0Long-term debt, FY2026, at 2026-04-30$0. XBRL concept us-gaap:LongTermDebtNoncurrent. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure | 536Long-term debt, Q1 FY2027, at 2026-07-31$535.7m. XBRL concept us-gaap:LongTermDebtNoncurrent. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure |
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| Current portion of debt | $m | not reported | not reported | not reported | not reported | 0.0Current portion of debt, FY2026, at 2026-04-30$0. XBRL concept us-gaap:LongTermDebtCurrent. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure | 17.1Current portion of debt, Q1 FY2027, at 2026-07-31$17.1m. XBRL concept us-gaap:LongTermDebtCurrent. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure |
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| Short-term borrowings | $m | not reported | not reported | not reported | not reported | 0.0Short-term borrowings, FY2026, at 2026-04-30$0. XBRL concept us-gaap:ShortTermBorrowings. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure | 40.0Short-term borrowings, Q1 FY2027, at 2026-07-31$40.0m. XBRL concept us-gaap:ShortTermBorrowings. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure |
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| Shareholders' equity | $m | 131Shareholders' equity, period not labelled, at 2023-04-30$131.0m. XBRL concept us-gaap:StockholdersEquity. 10-K filed 2026-07-28, accession 0001193125-26-321135.Report this figure | 200Shareholders' equity, period not labelled, at 2024-04-30$200.4m. XBRL concept us-gaap:StockholdersEquity. 10-K filed 2026-07-28, accession 0001193125-26-321135.Report this figure | 215Shareholders' equity, period not labelled, at 2025-04-30$215.1m. XBRL concept us-gaap:StockholdersEquity. 10-K filed 2026-07-28, accession 0001193125-26-321135.Report this figure | 215Shareholders' equity, period not labelled, at 2025-07-31$215.4m. XBRL concept us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure | 313Shareholders' equity, FY2026, at 2026-04-30$312.8m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure | 962Shareholders' equity, Q1 FY2027, at 2026-07-31$961.5m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-09-14, accession 0001193125-26-390681.Report this figure |
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