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Segment Geographic and Significant Customer Information - Schedule of Financial Information by Segment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 28, 2022	Jan. 29, 2021	Jan. 28, 2022	Jan. 29, 2021
Segment Reporting [Abstract]
Unallocated cost of revenue stock-based compensation expense	$ 5	$ 3	$ 13	$ 10
Unallocated cost of revenue amortization of intangible assets	$ 9	$ 12	$ 23	$ 34

X

- Definition

Unallocated cost of revenue amortization of intangible assets.

+ References

No definition available.

+ Details

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

X

- Definition

Unallocated cost of revenue stock-based compensation expense.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration