CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Jan. 23, 2015	Jan. 24, 2014	Jan. 23, 2015	Jan. 24, 2014
Revenues:
Product	$ 929.5us-gaap_SalesRevenueGoodsNet	$ 1,015.0us-gaap_SalesRevenueGoodsNet	$ 2,741.2us-gaap_SalesRevenueGoodsNet	$ 2,901.1us-gaap_SalesRevenueGoodsNet
Software entitlements and maintenance	226.6ntap_SoftwareEntitlementsAndMaintenance	227.0ntap_SoftwareEntitlementsAndMaintenance	672.1ntap_SoftwareEntitlementsAndMaintenance	687.3ntap_SoftwareEntitlementsAndMaintenance
Service	395.2us-gaap_SalesRevenueServicesNet	368.0us-gaap_SalesRevenueServicesNet	1,169.7us-gaap_SalesRevenueServicesNet	1,087.7us-gaap_SalesRevenueServicesNet
Net revenues	1,551.3us-gaap_SalesRevenueNet	1,610.0us-gaap_SalesRevenueNet	4,583.0us-gaap_SalesRevenueNet	4,676.1us-gaap_SalesRevenueNet
Cost of revenues:
Cost of product	419.6us-gaap_CostOfGoodsSold	450.7us-gaap_CostOfGoodsSold	1,215.6us-gaap_CostOfGoodsSold	1,323.9us-gaap_CostOfGoodsSold
Cost of software entitlements and maintenance	9.4	7.7	26.2	22.7
Cost of service	144.9us-gaap_CostOfServices	149.3us-gaap_CostOfServices	443.2us-gaap_CostOfServices	452.4us-gaap_CostOfServices
Total cost of revenues	573.9us-gaap_CostOfRevenue	607.7us-gaap_CostOfRevenue	1,685.0us-gaap_CostOfRevenue	1,799.0us-gaap_CostOfRevenue
Gross profit	977.4us-gaap_GrossProfit	1,002.3us-gaap_GrossProfit	2,898.0us-gaap_GrossProfit	2,877.1us-gaap_GrossProfit
Operating expenses:
Sales and marketing	474.8us-gaap_SellingAndMarketingExpense	475.9us-gaap_SellingAndMarketingExpense	1,443.0us-gaap_SellingAndMarketingExpense	1,423.2us-gaap_SellingAndMarketingExpense
Research and development	229.9us-gaap_ResearchAndDevelopmentExpense	230.3us-gaap_ResearchAndDevelopmentExpense	686.9us-gaap_ResearchAndDevelopmentExpense	686.6us-gaap_ResearchAndDevelopmentExpense
General and administrative	70.2us-gaap_GeneralAndAdministrativeExpense	69.4us-gaap_GeneralAndAdministrativeExpense	213.2us-gaap_GeneralAndAdministrativeExpense	207.3us-gaap_GeneralAndAdministrativeExpense
Restructuring and other charges	0us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges	49.5us-gaap_RestructuringCharges
Total operating expenses	774.9us-gaap_OperatingExpenses	775.6us-gaap_OperatingExpenses	2,343.1us-gaap_OperatingExpenses	2,366.6us-gaap_OperatingExpenses
Income from operations	202.5us-gaap_OperatingIncomeLoss	226.7us-gaap_OperatingIncomeLoss	554.9us-gaap_OperatingIncomeLoss	510.5us-gaap_OperatingIncomeLoss
Other income (expense), net:
Interest income	8.6us-gaap_InvestmentIncomeNet	7.9us-gaap_InvestmentIncomeNet	25.0us-gaap_InvestmentIncomeNet	26.4us-gaap_InvestmentIncomeNet
Interest expense	(11.1)us-gaap_InterestExpense	(6.7)us-gaap_InterestExpense	(31.0)us-gaap_InterestExpense	(29.7)us-gaap_InterestExpense
Other income (expense), net	0.1us-gaap_OtherNonoperatingIncomeExpense	1.7us-gaap_OtherNonoperatingIncomeExpense	(0.2)us-gaap_OtherNonoperatingIncomeExpense	6.9us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense), net	(2.4)us-gaap_NonoperatingIncomeExpense	2.9us-gaap_NonoperatingIncomeExpense	(6.2)us-gaap_NonoperatingIncomeExpense	3.6us-gaap_NonoperatingIncomeExpense
Income before income taxes	200.1	229.6	548.7	514.1
Provision for income taxes	23.3us-gaap_IncomeTaxExpenseBenefit	37.5us-gaap_IncomeTaxExpenseBenefit	123.7us-gaap_IncomeTaxExpenseBenefit	73.6us-gaap_IncomeTaxExpenseBenefit
Net income	$ 176.8us-gaap_NetIncomeLoss	$ 192.1us-gaap_NetIncomeLoss	$ 425.0us-gaap_NetIncomeLoss	$ 440.5us-gaap_NetIncomeLoss
Net income per share:
Basic	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 1.34us-gaap_EarningsPerShareBasic	$ 1.28us-gaap_EarningsPerShareBasic
Diluted	$ 0.56us-gaap_EarningsPerShareDiluted	$ 0.55us-gaap_EarningsPerShareDiluted	$ 1.31us-gaap_EarningsPerShareDiluted	$ 1.25us-gaap_EarningsPerShareDiluted
Shares used in net income per share calculations:
Basic	311.6	339.4	317.8	343.7
Diluted	317.1	346.2	323.3	351.7
Cash dividends declared per share	$ 0.165	$ 0.150	$ 0.495	$ 0.450

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