| Revenue | $m | 380Revenue, period not labelled, three months to 2025-03-31$380.1m. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 400Revenue, period not labelled, three months to 2025-06-30$400.4m. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 415Revenue, period not labelled, three months to 2025-09-30$414.8m. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | 459Revenue, Q1 FY2026, three months to 2026-03-31$458.9m. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 501Revenue, Q2 FY2026, three months to 2026-06-30$500.7m. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 564Revenue, Q3 FY2026, three months to 2026-09-30$564.0m. XBRL concept us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure |
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| Cost of revenue | $m | 217Cost of revenue, period not labelled, three months to 2025-03-31$217.2m. XBRL concept us-gaap:CostOfRevenue. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 203Cost of revenue, period not labelled, three months to 2025-06-30$202.8m. XBRL concept us-gaap:CostOfRevenue. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 211Cost of revenue, period not labelled, three months to 2025-09-30$210.5m. XBRL concept us-gaap:CostOfRevenue. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | 224Cost of revenue, Q1 FY2026, three months to 2026-03-31$224.0m. XBRL concept us-gaap:CostOfRevenue. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 238Cost of revenue, Q2 FY2026, three months to 2026-06-30$238.1m. XBRL concept us-gaap:CostOfRevenue. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 258Cost of revenue, Q3 FY2026, three months to 2026-09-30$257.9m. XBRL concept us-gaap:CostOfRevenue. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure |
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| Gross profit | $m | 163Gross profit, period not labelled, three months to 2025-03-31$162.9m. XBRL concept us-gaap:GrossProfit. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 198Gross profit, period not labelled, three months to 2025-06-30$197.6m. XBRL concept us-gaap:GrossProfit. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 204Gross profit, period not labelled, three months to 2025-09-30$204.3m. XBRL concept us-gaap:GrossProfit. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | 235Gross profit, Q1 FY2026, three months to 2026-03-31$234.8m. XBRL concept us-gaap:GrossProfit. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 263Gross profit, Q2 FY2026, three months to 2026-06-30$262.6m. XBRL concept us-gaap:GrossProfit. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 306Gross profit, Q3 FY2026, three months to 2026-09-30$306.1m. XBRL concept us-gaap:GrossProfit. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure |
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| Selling, general and administrative | $m | 68.6Selling, general and administrative, period not labelled, three months to 2025-03-31$68.6m. XBRL concept us-gaap:SellingGeneralAndAdministrativeExpense. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 80.6Selling, general and administrative, period not labelled, three months to 2025-06-30$80.6m. XBRL concept us-gaap:SellingGeneralAndAdministrativeExpense. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 77.3Selling, general and administrative, period not labelled, three months to 2025-09-30$77.3m. XBRL concept us-gaap:SellingGeneralAndAdministrativeExpense. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | 88.3Selling, general and administrative, Q1 FY2026, three months to 2026-03-31$88.3m. XBRL concept us-gaap:SellingGeneralAndAdministrativeExpense. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 194Selling, general and administrative, Q2 FY2026, three months to 2026-06-30$193.6m. XBRL concept us-gaap:SellingGeneralAndAdministrativeExpense. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 132Selling, general and administrative, Q3 FY2026, three months to 2026-09-30$132.0m. XBRL concept us-gaap:SellingGeneralAndAdministrativeExpense. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure |
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| Operating income | $m | 60.2Operating income, period not labelled, three months to 2025-03-31$60.2m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 82.9Operating income, period not labelled, three months to 2025-06-30$82.9m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 92.1Operating income, period not labelled, three months to 2025-09-30$92.1m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | 111Operating income, Q1 FY2026, three months to 2026-03-31$110.5m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 32.7Operating income, Q2 FY2026, three months to 2026-06-30$32.7m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 133Operating income, Q3 FY2026, three months to 2026-09-30$133.4m. XBRL concept us-gaap:OperatingIncomeLoss. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure |
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| Income tax | $m | (2.5)Income tax, period not labelled, three months to 2025-03-31−$2.5m. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 58.3Income tax, period not labelled, three months to 2025-06-30$58.3m. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 54.9Income tax, period not labelled, three months to 2025-09-30$54.9m. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | 15.7Income tax, Q1 FY2026, three months to 2026-03-31$15.7m. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-Q filed 2026-05-28, accession 0001193125-26-243043.Report this figure | 3.5Income tax, Q2 FY2026, three months to 2026-06-30$3.5m. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 36.0Income tax, Q3 FY2026, three months to 2026-09-30$36.0m. XBRL concept us-gaap:IncomeTaxExpenseBenefit. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure |
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| Net income | $m | (4.3)Net income, period not labelled, three months to 2025-03-31−$4.3m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | (29.3)Net income, period not labelled, three months to 2025-06-30−$29.3m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | (10.1)Net income, period not labelled, three months to 2025-09-30−$10.1m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | 53.3Net income, Q1 FY2026, three months to 2026-03-31$53.3m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | (4.9)Net income, Q2 FY2026, three months to 2026-06-30−$4.9m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure | 83.7Net income, Q3 FY2026, three months to 2026-09-30$83.7m. XBRL concept us-gaap:NetIncomeLoss. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure |
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| Diluted EPS | $ per share | not reported | not reported | not reported | not reported | (0.01)Diluted EPS, Q2 FY2026, three months to 2026-06-30−$0.01 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 0.20Diluted EPS, Q3 FY2026, three months to 2026-09-30$0.20 per share. XBRL concept us-gaap:EarningsPerShareDiluted. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure |
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| Basic EPS | $ per share | not reported | not reported | not reported | not reported | (0.01)Basic EPS, Q2 FY2026, three months to 2026-06-30−$0.01 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2026-07-30, accession 0001193125-26-325027.Report this figure | 0.20Basic EPS, Q3 FY2026, three months to 2026-09-30$0.20 per share. XBRL concept us-gaap:EarningsPerShareBasic. 10-Q filed 2026-10-29, accession 0001193125-26-437000.Report this figure |
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