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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jan. 23, 2015	Apr. 25, 2014
Commitments and Contingencies Disclosure [Line Items]
Future annual minimum lease payments	203.2us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Accrued purchase commitments with contract manufacturers	9.4ntap_AccruedLiabilityForQuantitiesInExcessOfFutureDemandForecastsWithContractManufacturers	11.5ntap_AccruedLiabilityForQuantitiesInExcessOfFutureDemandForecastsWithContractManufacturers
Maximum
Commitments and Contingencies Disclosure [Line Items]
Terms of recourse leases	3 years
Software Products
Commitments and Contingencies Disclosure [Line Items]
Product warranty term	90 days
Hardware Products
Commitments and Contingencies Disclosure [Line Items]
Product warranty term	3 years
Contract Manufacturers
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	274.6us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = ntap_ContractManufacturersMember
Capital Purchase Commitments
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	68.8us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = us-gaap_CapitalAdditionsMember
Other Purchase Commitments
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	192.2us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = us-gaap_PurchaseCommitmentMember

X

- Definition

Accrued liability for quantities in excess of future demand forecasts with contract manufacturers.

+ References

No definition available.

+ Details

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- Details

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Balance Type:	na
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X

- Definition

The approximate term of software and hardware product warranty, respectively.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The approximate maximum term of recourse financing arrangements.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.25)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 25

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 17

-Article 9



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.17)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a)(19))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Details

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- Details

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- Details

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- Details

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- Details

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