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Balance Sheet Details - Deferred Revenue (Detail) (USD $) In Millions, unless otherwise specified	Jan. 23, 2015	Apr. 25, 2014
Deferred Revenue Arrangement [Line Items]
Short-term	$ 1,679.4us-gaap_DeferredRevenueCurrent	$ 1,653.8us-gaap_DeferredRevenueCurrent
Long-term	1,430.3us-gaap_DeferredRevenueNoncurrent	1,446.4us-gaap_DeferredRevenueNoncurrent
Short-term and long-term deferred revenue, Total	3,109.7us-gaap_DeferredRevenue	3,100.2us-gaap_DeferredRevenue
Product
Deferred Revenue Arrangement [Line Items]
Short-term and long-term deferred revenue, Total	24.2us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = us-gaap_ProductMember	23.4us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = us-gaap_ProductMember
Software entitlements and maintenance and service
Deferred Revenue Arrangement [Line Items]
Short-term and long-term deferred revenue, Total	$ 3,085.5us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = ntap_SoftwareEntitlementsAndMaintenanceAndServiceMember	$ 3,076.8us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = ntap_SoftwareEntitlementsAndMaintenanceAndServiceMember

X

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

+ Details

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- Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 8

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 8

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

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