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v2.4.1.9

Financing Arrangements - Carrying Value of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified | Apr. 24, 2015 | Apr. 25, 2014
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Debt Instrument [Line Items] |  |
Total principal amount | $ 1,500.0 us-gaap_DebtInstrumentFaceAmount | $ 1,000.0 us-gaap_DebtInstrumentFaceAmount
Less: Unamortized discount | (5.0)us-gaap_DebtInstrumentUnamortizedDiscount | (4.5)us-gaap_DebtInstrumentUnamortizedDiscount
Unamortized issuance costs | (7.5)ntap_UnamortizedDebtIssuanceExpense1 | (5.4)ntap_UnamortizedDebtIssuanceExpense1
Total long-term debt | 1,487.5 us-gaap_LongTermDebtNoncurrent | 990.1 us-gaap_LongTermDebtNoncurrent
Senior Notes | Due 2017 |  |
Debt Instrument [Line Items] |  |
Total principal amount | 750.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 750.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Debt Instrument, Effective Interest Rate | 2.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 2.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes | Due 2021 |  |
Debt Instrument [Line Items] |  |
Total principal amount | 500.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Debt Instrument, Effective Interest Rate | 3.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Senior Notes | Due 2022 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 250.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | $ 250.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Debt Instrument, Effective Interest Rate | 3.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 3.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember

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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. + References No definition available. + Details
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Namespace Prefix: | ntap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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Balance Type: | credit
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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Balance Type: | na
Period Type: | duration

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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Balance Type: | debit
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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