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Revenue - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Apr. 26, 2019 | Apr. 27, 2018
Disaggregation Of Revenue [Abstract] |  |
Revenue recognized | $ 1,722 | $ 1,806
Transaction price allocated to remaining performance obligations | $ 3,668 |

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- Definition Amount of revenue recognized that was previously included in balance of contract with customer liability obligation as of the beginning of the period. + References No definition available. + Details
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Namespace Prefix: | ntap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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