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Business Combinations - Allocation of Purchase Consideration for Business Combination (Detail) (USD $) In Millions, unless otherwise specified	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Business Acquisition [Line Items]
Goodwill	$ 1,027.4us-gaap_Goodwill	$ 988.1us-gaap_Goodwill	$ 988.1us-gaap_Goodwill
Fiscal 2013 Acquisitions
Business Acquisition [Line Items]
Net liabilities assumed			(5.1)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2013AcquisitionsMember
Finite-lived intangible assets			30.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2013AcquisitionsMember
Goodwill			82.9us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2013AcquisitionsMember
Total purchase price			$ 108.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2013AcquisitionsMember

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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