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Financing Arrangements - Carrying Value of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified | Jan. 23, 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 | (5.3)us-gaap_DebtInstrumentUnamortizedDiscount | (4.5)us-gaap_DebtInstrumentUnamortizedDiscount
Total long-term debt | 1,494.7 us-gaap_LongTermDebtNoncurrent | 995.5 us-gaap_LongTermDebtNoncurrent
Senior Notes Due 2017 |  |
Debt Instrument [Line Items] |  |
Total principal amount | 750.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentySeventeenMember | 750.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentySeventeenMember
Debt Instrument, Effective Interest Rate | 2.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentySeventeenMember | 2.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentySeventeenMember
Senior Notes Due 2021 |  |
Debt Instrument [Line Items] |  |
Total principal amount | 500.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyOneMember | 0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyOneMember
Debt Instrument, Effective Interest Rate | 3.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyOneMember |
Senior Notes Due 2022 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 250.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyTwoMember | $ 250.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyTwoMember
Debt Instrument, Effective Interest Rate | 3.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyTwoMember | 3.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyTwoMember

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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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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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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- 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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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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