Balance Sheet Details - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
Jan. 25, 2013
Property, Plant and Equipment [Line Items]
Purchase price of the facilities	$ 69.6
Estimated fair value of the facilities acquired	$ 88.4

The cash outflow for acquisition of land and buildings for use under synthetic lease arrangements.

No definition available.

Name:	ntap_PaymentsToAcquireLandAndBuildingsUnderSyntheticLeaseArrangements
Namespace Prefix:	ntap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration