| Cash and equivalents | $m | 0.1Cash and equivalents, Q1 FY2025, at 2023-12-31$100.0k. XBRL concept us-gaap:Cash. 10-Q filed 2024-02-23, accession 0001193125-24-044319.Report this figure | not reported | not reported | not reported | not reported | not reported | not reported | not reported | not reported | not reported | not reported |
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| Total assets | $m | 0.1Total assets, Q1 FY2025, at 2023-12-31$100.0k. XBRL concept us-gaap:Assets. 10-Q filed 2024-02-23, accession 0001193125-24-044319.Report this figure | 342Total assets, FY2025, at 2024-03-31$341.9m. XBRL concept us-gaap:Assets. 10-K filed 2025-06-30, accession 0001140361-25-024065.Report this figure | 373Total assets, Q1 FY2025, at 2024-06-30$373.1m. XBRL concept us-gaap:Assets. 10-Q filed 2024-08-14, accession 0001193125-24-200698.Report this figure | 452Total assets, Q2 FY2025, at 2024-09-30$452.4m. XBRL concept us-gaap:Assets. 10-Q filed 2024-11-12, accession 0001193125-24-255750.Report this figure | 712Total assets, Q3 FY2025, at 2024-12-31$711.9m. XBRL concept us-gaap:Assets. 10-Q filed 2025-02-12, accession 0001140361-25-004059.Report this figure | 411Total assets, FY2025, at 2025-03-31$411.2m. XBRL concept us-gaap:Assets. 10-K filed 2026-06-29, accession 0001140361-26-026744.Report this figure | 560Total assets, Q1 FY2026, at 2025-06-30$559.7m. XBRL concept us-gaap:Assets. 10-Q filed 2025-08-14, accession 0001140361-25-030876.Report this figure | 661Total assets, Q2 FY2026, at 2025-09-30$661.3m. XBRL concept us-gaap:Assets. 10-Q filed 2025-11-13, accession 0001140361-25-041932.Report this figure | 506Total assets, Q3 FY2026, at 2025-12-31$506.0m. XBRL concept us-gaap:Assets. 10-Q filed 2026-02-17, accession 0001140361-26-005787.Report this figure | 429Total assets, FY2026, at 2026-03-31$429.4m. XBRL concept us-gaap:Assets. 10-Q filed 2026-08-14, accession 0001140361-26-033208.Report this figure | 335Total assets, Q1 FY2027, at 2026-06-30$334.8m. XBRL concept us-gaap:Assets. 10-Q filed 2026-08-14, accession 0001140361-26-033208.Report this figure |
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| Total liabilities | $m | 0.0Total liabilities, Q1 FY2025, at 2023-12-31$0. XBRL concept us-gaap:Liabilities. 10-Q filed 2024-02-23, accession 0001193125-24-044319.Report this figure | 0.0Total liabilities, FY2025, at 2024-03-31$21. XBRL concept us-gaap:Liabilities. 10-K filed 2025-06-30, accession 0001140361-25-024065.Report this figure | 0.0Total liabilities, Q1 FY2025, at 2024-06-30$21. XBRL concept us-gaap:Liabilities. 10-Q filed 2024-08-14, accession 0001193125-24-200698.Report this figure | 0.1Total liabilities, Q2 FY2025, at 2024-09-30$65.6k. XBRL concept us-gaap:Liabilities. 10-Q filed 2024-11-12, accession 0001193125-24-255750.Report this figure | 0.3Total liabilities, Q3 FY2025, at 2024-12-31$295.7k. XBRL concept us-gaap:Liabilities. 10-Q filed 2025-02-12, accession 0001140361-25-004059.Report this figure | 0.3Total liabilities, FY2025, at 2025-03-31$301.3k. XBRL concept us-gaap:Liabilities. 10-K filed 2026-06-29, accession 0001140361-26-026744.Report this figure | 0.2Total liabilities, Q1 FY2026, at 2025-06-30$237.3k. XBRL concept us-gaap:Liabilities. 10-Q filed 2025-08-14, accession 0001140361-25-030876.Report this figure | 0.3Total liabilities, Q2 FY2026, at 2025-09-30$296.6k. XBRL concept us-gaap:Liabilities. 10-Q filed 2025-11-13, accession 0001140361-25-041932.Report this figure | 5.1Total liabilities, Q3 FY2026, at 2025-12-31$5.1m. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-02-17, accession 0001140361-26-005787.Report this figure | 0.1Total liabilities, FY2026, at 2026-03-31$69.7k. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-08-14, accession 0001140361-26-033208.Report this figure | 0.1Total liabilities, Q1 FY2027, at 2026-06-30$56.9k. XBRL concept us-gaap:Liabilities. 10-Q filed 2026-08-14, accession 0001140361-26-033208.Report this figure |
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| Shareholders' equity | $m | 2.6Shareholders' equity, period not labelled, at 2024-01-10$2.6m. XBRL concept us-gaap:StockholdersEquity. 10-K filed 2025-06-30, accession 0001140361-25-024065.Report this figure | 281Shareholders' equity, FY2025, at 2024-03-31$280.6m. XBRL concept us-gaap:StockholdersEquity. 10-K filed 2026-06-29, accession 0001140361-26-026744.Report this figure | 348Shareholders' equity, Q1 FY2025, at 2024-06-30$348.1m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2025-11-13, accession 0001140361-25-041932.Report this figure | 425Shareholders' equity, Q2 FY2025, at 2024-09-30$424.6m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-02-17, accession 0001140361-26-005787.Report this figure | 470Shareholders' equity, Q3 FY2025, at 2024-12-31$470.0m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-02-17, accession 0001140361-26-005787.Report this figure | 240Shareholders' equity, FY2025, at 2025-03-31$240.4m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-14, accession 0001140361-26-033208.Report this figure | 261Shareholders' equity, Q1 FY2026, at 2025-06-30$260.7m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-14, accession 0001140361-26-033208.Report this figure | 334Shareholders' equity, Q2 FY2026, at 2025-09-30$334.2m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-02-17, accession 0001140361-26-005787.Report this figure | 331Shareholders' equity, Q3 FY2026, at 2025-12-31$331.1m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-02-17, accession 0001140361-26-005787.Report this figure | 377Shareholders' equity, FY2026, at 2026-03-31$377.4m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-14, accession 0001140361-26-033208.Report this figure | 329Shareholders' equity, Q1 FY2027, at 2026-06-30$329.4m. XBRL concept us-gaap:StockholdersEquity. 10-Q filed 2026-08-14, accession 0001140361-26-033208.Report this figure |
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