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Segment Geographic and Significant Customer Information - Schedule of Property and Equipment Net by Geographic Areas (Detail) (USD $) In Millions, unless otherwise specified | Apr. 24, 2015 | Apr. 25, 2014
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Segment Reporting, Asset Reconciling Item [Line Items] |  |
Property and equipment | $ 1,029.9 us-gaap_PropertyPlantAndEquipmentNet | $ 1,108.8 us-gaap_PropertyPlantAndEquipmentNet
U.S. |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Property and equipment | 926.9 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 1,021.4 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
International |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Property and equipment | $ 103.0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = ntap_InternationalMember | $ 87.4 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = ntap_InternationalMember

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=ntap_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |