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Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
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Apr. 24, 2015 | Apr. 25, 2014 | Apr. 26, 2013
Commitments and Contingencies Disclosure [Line Items] |  |  |
Rent expense | $ 67,000,000 us-gaap_OperatingLeasesRentExpenseNet | $ 65,500,000 us-gaap_OperatingLeasesRentExpenseNet | $ 64,900,000 us-gaap_OperatingLeasesRentExpenseNet
Accrued purchase commitments with contract manufacturers | 16,900,000 ntap_AccruedLiabilityForQuantitiesInExcessOfFutureDemandForecastsWithContractManufacturers | 11,500,000 ntap_AccruedLiabilityForQuantitiesInExcessOfFutureDemandForecastsWithContractManufacturers |
Financial guarantees not recorded on consolidated balance sheets | 9,300,000 us-gaap_GuaranteeObligationsCurrentCarryingValue |  |
Legal proceedings and claims | 0 us-gaap_LossContingencyAccrualAtCarryingValue |  |
Maximum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Terms of recourse leases | 3 years |  |
Contract Manufacturers |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Purchase commitments | 295,000,000 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = ntap_ContractManufacturersMember |  |
Construction Related Obligations |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Purchase commitments | 60,000,000 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = us-gaap_CapitalAdditionsMember |  |
Other Purchase Obligations |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Purchase commitments | $ 211,000,000 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = us-gaap_PurchaseCommitmentMember |  |

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- Definition Accrued liability for quantities in excess of future demand forecasts with contract manufacturers. + References No definition available. + Details
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- Definition The approximate maximum term of recourse financing arrangements. + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 + Details
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