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Business Combinations - Additional Information (Detail) (Fiscal 2015 Acquisitions, USD $) In Millions, unless otherwise specified	0 Months Ended
	Oct. 27, 2014
SteelStore Product Line
Business Acquisition [Line Items]
Business acquisition cash paid	$ 79.1us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember / dei_LegalEntityAxis = ntap_SteelStoreProductLineMember
Privately Held Software Developer
Business Acquisition [Line Items]
Business acquisition cash paid	$ 5.5us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember / dei_LegalEntityAxis = ntap_PrivatelyHeldSoftwareDeveloperMember

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Details

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