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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 23, 2015 | Jan. 23, 2015 | Apr. 25, 2014 | Jan. 24, 2014 | Apr. 26, 2013
Income Tax Contingency [Line Items] |  |  |  |  |
Research credit | $ 6.0 us-gaap_IncomeTaxReconciliationTaxCredits | $ 6.0 us-gaap_IncomeTaxReconciliationTaxCredits | $ 4.1 us-gaap_IncomeTaxReconciliationTaxCredits |  |
Resolution of income tax examinations |  | 47.4 us-gaap_IncomeTaxReconciliationTaxSettlements |  |  |
Expected refund, excluding interest from fiscal 2005 to 2007 income tax audit | 8.0 us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority | 8.0 us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority |  |  |
Gross unrecognized tax benefits | 275.4 us-gaap_UnrecognizedTaxBenefits | 275.4 us-gaap_UnrecognizedTaxBenefits | 235.9 us-gaap_UnrecognizedTaxBenefits | 207.8 us-gaap_UnrecognizedTaxBenefits | 189.6 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits included in other long-term liabilities | 220.2 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent | 220.2 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  |  |
Unrecognized tax benefits that would affect provision for income taxes | 169.7 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 169.7 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |
United Kingdom's tax authority |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Resolution of income tax examinations |  | $ 1.0 us-gaap_IncomeTaxReconciliationTaxSettlements / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_HerMajestysRevenueAndCustomsHMRCMember |  |  |

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- Definition The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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