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v2.4.1.9

Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Apr. 24, 2015 | Apr. 25, 2014
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Reserves and accruals | $ 94.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves | $ 89.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Acquired intangibles | 43.8 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 22.3 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Net operating loss and credit carryforwards | 79.6 ntap_DeferredTaxAssetsOperatingLossAndCreditCarryforwards | 87.6 ntap_DeferredTaxAssetsOperatingLossAndCreditCarryforwards
Stock-based compensation | 70.4 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 73.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred revenue | 297.7 us-gaap_DeferredTaxAssetsDeferredIncome | 318.9 us-gaap_DeferredTaxAssetsDeferredIncome
Other | 27.0 us-gaap_DeferredTaxAssetsOther | 19.8 us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets | 612.8 us-gaap_DeferredTaxAssetsGross | 611.2 us-gaap_DeferredTaxAssetsGross
Valuation allowance | (57.7)us-gaap_DeferredTaxAssetsValuationAllowance | (49.6)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net of valuation allowance | 555.1 us-gaap_DeferredTaxAssetsNet | 561.6 us-gaap_DeferredTaxAssetsNet
Reserves and accruals | 4.0 us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals | 3.9 us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals
Acquired intangibles | 13.7 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | 10.0 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Property and equipment | 26.3 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 30.8 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other | 3.5 us-gaap_DeferredTaxLiabilitiesOther | 2.6 us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | 47.5 us-gaap_DeferredTaxLiabilities | 47.3 us-gaap_DeferredTaxLiabilities
Deferred tax assets, net of valuation allowance and deferred tax liabilities | $ 507.6 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 514.3 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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