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

No definition available.

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Namespace Prefix:	ntap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Details

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Period Type:	duration

- Definition

The approximate maximum term of recourse financing arrangements.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of loss contingency liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

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Period Type:	instant

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

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Balance Type:	debit
Period Type:	duration

- 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 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 2: 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 3: 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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 7

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Commitments and Contingencies Disclosure [Line Items]
Rent expense	$ 67,000,000us-gaap_OperatingLeasesRentExpenseNet	$ 65,500,000us-gaap_OperatingLeasesRentExpenseNet	$ 64,900,000us-gaap_OperatingLeasesRentExpenseNet
Accrued purchase commitments with contract manufacturers	16,900,000	11,500,000
Financial guarantees not recorded on consolidated balance sheets	9,300,000
Legal proceedings and claims	0
Maximum
Commitments and Contingencies Disclosure [Line Items]
Terms of recourse leases	3 years
Contract Manufacturers
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	295,000,000
Construction Related Obligations
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	60,000,000
Other Purchase Obligations
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 211,000,000