Revenue - Impacts of Adoption of ASC 606 to Consolidated Balance Sheet (Parenthetical) (Detail) $ in Millions	Apr. 29, 2016 USD ($)
Revenue From Contract With Customer [Abstract]
Cumulative-effect of adoption of ASC 606	$ 197

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of ASC 606 Revenue from Contracts with Customers applied in the period of adoption.

No definition available.

Name:	ntap_CumulativeEffectOfAccountingStandardsUpdate201409InPeriodOfAdoption
Namespace Prefix:	ntap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant