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Goodwill and Purchased Intangible Assets, Net - Amortization Expense for Purchased Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 23, 2015 | Jan. 24, 2014 | Jan. 23, 2015 | Jan. 24, 2014
Acquired Finite Lived Intangible Assets [Line Items] |  |  |  |
Amortization expense | $ 19.2 us-gaap_AmortizationOfIntangibleAssets | $ 14.7 us-gaap_AmortizationOfIntangibleAssets | $ 48.2 us-gaap_AmortizationOfIntangibleAssets | $ 44.5 us-gaap_AmortizationOfIntangibleAssets
Cost of revenues | Developed Technology |  |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |  |
Amortization expense | 18.9 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 14.2 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 47.4 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 42.8 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Operating expenses | Customer Contracts/Relationships |  |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |  |
Amortization expense | 0.2 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 0.3 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 0.4 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 1.0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember
Operating expenses | Trademarks and Trade Names |  |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |  |
Amortization expense | 0.1 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 0.1 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 0.4 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 0.3 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember
Operating expenses | Covenants not to Compete |  |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |  |
Amortization expense | $ 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | $ 0.1 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | $ 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | $ 0.4 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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