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Financing Arrangements - Carrying Value of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Jan. 23, 2015	Apr. 25, 2014
Debt Instrument [Line Items]
Total principal amount	$ 1,500.0us-gaap_DebtInstrumentFaceAmount	$ 1,000.0us-gaap_DebtInstrumentFaceAmount
Less: Unamortized discount	(5.3)us-gaap_DebtInstrumentUnamortizedDiscount	(4.5)us-gaap_DebtInstrumentUnamortizedDiscount
Total long-term debt	1,494.7us-gaap_LongTermDebtNoncurrent	995.5us-gaap_LongTermDebtNoncurrent
Senior Notes Due 2017
Debt Instrument [Line Items]
Total principal amount	750.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentySeventeenMember	750.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentySeventeenMember
Debt Instrument, Effective Interest Rate	2.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentySeventeenMember	2.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentySeventeenMember
Senior Notes Due 2021
Debt Instrument [Line Items]
Total principal amount	500.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyOneMember	0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyOneMember
Debt Instrument, Effective Interest Rate	3.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyOneMember
Senior Notes Due 2022
Debt Instrument [Line Items]
Total principal amount	$ 250.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyTwoMember	$ 250.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyTwoMember
Debt Instrument, Effective Interest Rate	3.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyTwoMember	3.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = ntap_SeniorNotesDueTwentyTwentyTwoMember

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

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X

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



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

-Publisher FASB

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-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease 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 210.5-02.22)

-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 22

-Article 5

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