Segment Geographic and Significant Customer Information - Schedule of Financial Information by Segment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
Jul. 30, 2021	Jul. 31, 2020
Segment Reporting [Abstract]
Unallocated cost of revenue stock-based compensation expense	$ 4	$ 4
Unallocated cost of revenue amortization of intangible assets	$ 7	$ 10

Unallocated cost of revenue amortization of intangible assets.

No definition available.

Name:	ntap_UnallocatedCostOfRevenueAmortizationOfIntangibleAssets
Namespace Prefix:	ntap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration