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v2.4.1.9

Restructuring and Other Charges - Activities Related to Restructuring Reserves (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Apr. 24, 2015 | Apr. 25, 2014 | Apr. 26, 2013
Restructuring Cost and Reserve [Line Items] |  |  |
Balance at beginning of period | $ 26.5 us-gaap_RestructuringReserve | $ 0 us-gaap_RestructuringReserve |
Net charges | 0 us-gaap_RestructuringCharges | 88.3 us-gaap_RestructuringCharges | 0 us-gaap_RestructuringCharges
Cash payments | (26.5)us-gaap_PaymentsForRestructuring | (61.8)us-gaap_PaymentsForRestructuring |
Balance at end of period | 0 us-gaap_RestructuringReserve | 26.5 us-gaap_RestructuringReserve | 0 us-gaap_RestructuringReserve
March 2014 Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Balance at beginning of period | 26.5 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ntap_MarchTwentyFourteenRestructuringMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ntap_MarchTwentyFourteenRestructuringMember |
Net charges | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = ntap_MarchTwentyFourteenRestructuringMember | 38.8 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = ntap_MarchTwentyFourteenRestructuringMember |
Cash payments | (26.5)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = ntap_MarchTwentyFourteenRestructuringMember | (12.3)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = ntap_MarchTwentyFourteenRestructuringMember |
Balance at end of period | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ntap_MarchTwentyFourteenRestructuringMember | 26.5 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ntap_MarchTwentyFourteenRestructuringMember |
May 2013 Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Balance at beginning of period | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ntap_MayTwentyThirteenRestructuringMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ntap_MayTwentyThirteenRestructuringMember |
Net charges | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = ntap_MayTwentyThirteenRestructuringMember | 49.5 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = ntap_MayTwentyThirteenRestructuringMember |
Cash payments | 0 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = ntap_MayTwentyThirteenRestructuringMember | (49.5)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = ntap_MayTwentyThirteenRestructuringMember |
Balance at end of period | $ 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ntap_MayTwentyThirteenRestructuringMember | $ 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ntap_MayTwentyThirteenRestructuringMember |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |