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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	$ 19.2us-gaap_AmortizationOfIntangibleAssets	$ 14.7us-gaap_AmortizationOfIntangibleAssets	$ 48.2us-gaap_AmortizationOfIntangibleAssets	$ 44.5us-gaap_AmortizationOfIntangibleAssets
Cost of revenues | Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Amortization expense	18.9us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	14.2us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	47.4us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	42.8us-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	0.2us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	0.3us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	0.4us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	1.0us-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	0.1us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	0.1us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	0.4us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	0.3us-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	$ 0us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	$ 0.1us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	$ 0us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	$ 0.4us-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

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