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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Jan. 23, 2015 | Jan. 24, 2014
Cash flows from operating activities: |  |
Net income | $ 425.0 us-gaap_NetIncomeLoss | $ 440.5 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 234.6 us-gaap_DepreciationAndAmortization | 252.0 us-gaap_DepreciationAndAmortization
Stock-based compensation | 196.1 us-gaap_ShareBasedCompensation | 205.8 us-gaap_ShareBasedCompensation
Deferred income taxes | 2.1 us-gaap_DeferredIncomeTaxesAndTaxCredits | (30.9)us-gaap_DeferredIncomeTaxesAndTaxCredits
Excess tax benefit from stock-based compensation | (53.8)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (33.4)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Other non-cash items, net | 27.5 us-gaap_OtherNoncashIncomeExpense | 8.5 us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities, net of acquisitions of businesses: |  |
Accounts receivable | 186.7 us-gaap_IncreaseDecreaseInAccountsReceivable | 213.4 us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories | 4.6 us-gaap_IncreaseDecreaseInInventories | 21.3 us-gaap_IncreaseDecreaseInInventories
Other operating assets | 10.3 us-gaap_IncreaseDecreaseInOtherOperatingAssets | 78.3 us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable | (45.9)us-gaap_IncreaseDecreaseInAccountsPayableTrade | (69.8)us-gaap_IncreaseDecreaseInAccountsPayableTrade
Accrued compensation and other current liabilities | (162.1)ntap_IncreaseDecreaseInEmployeeRelatedLiabilitiesAndOtherCurrentLiabilities | (94.5)ntap_IncreaseDecreaseInEmployeeRelatedLiabilitiesAndOtherCurrentLiabilities
Deferred revenue | 34.4 us-gaap_IncreaseDecreaseInDeferredRevenue | (27.0)us-gaap_IncreaseDecreaseInDeferredRevenue
Other operating liabilities | 12.0 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 15.9 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities | 871.5 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 980.1 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities: |  |
Purchases of investments | (1,431.5)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (701.3)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Maturities, sales and collections of investments | 1,473.1 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments | 1,464.0 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Purchases of property and equipment | (138.1)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (165.4)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisitions of businesses | (84.6)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Other investing activities, net | 2.5 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 2.6 us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash provided by (used in) investing activities | (178.6)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | 599.9 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities: |  |
Issuance of common stock under employee stock plans | 145.6 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions | 191.8 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Repurchase of common stock and forward contract | (918.9)us-gaap_PaymentsForRepurchaseOfCommonStock | (1,507.0)us-gaap_PaymentsForRepurchaseOfCommonStock
Excess tax benefit from stock-based compensation | 53.8 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 33.4 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Repayment of debt | 0 us-gaap_RepaymentsOfLongTermDebt | (1,264.9)us-gaap_RepaymentsOfLongTermDebt
Issuance of long-term debt, net | 494.7 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Dividends paid | (156.9)us-gaap_PaymentsOfDividends | (153.1)us-gaap_PaymentsOfDividends
Other financing activities, net | (7.6)us-gaap_ProceedsFromRepaymentsOfOtherLongTermDebt | (7.5)us-gaap_ProceedsFromRepaymentsOfOtherLongTermDebt
Net cash used in financing activities | (389.3)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (2,707.3)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents | (54.9)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 2.9 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents | 248.7 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (1,124.4)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents: |  |
Beginning of period | 2,291.0 us-gaap_CashAndCashEquivalentsAtCarryingValue | 3,277.1 us-gaap_CashAndCashEquivalentsAtCarryingValue
End of period | $ 2,539.7 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 2,152.7 us-gaap_CashAndCashEquivalentsAtCarryingValue

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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from other long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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