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Business Combinations - Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Millions, unless otherwise specified | Apr. 24, 2015 | Apr. 25, 2014 | Apr. 26, 2013
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Business Acquisition [Line Items] |  |  |
Goodwill | $ 1,027.4 us-gaap_Goodwill | $ 988.1 us-gaap_Goodwill | $ 988.1 us-gaap_Goodwill
Fiscal 2015 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Prepaid expenses and other current assets | 2.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember |  |
Finite-lived intangible assets | 31.8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember |  |
Goodwill | 39.3 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember |  |
Deferred income taxes | 10.8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember |  |
Other non-current assets | 1.1 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember |  |
Total assets acquired | 85.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember |  |
Deferred revenue | (1.1)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember |  |
Total purchase price | $ 84.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ntap_Fiscal2015AcquisitionsMember |  |

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