2.4.0.8181 - Disclosure - Acquisition - Additional Information (Detail)truefalseShare data in Millions, unless otherwise specifiedfalse1false falsefalseeol_PE10781---1310-K0007_STD_28_20130308_0http://www.sec.gov/CIK0000106040duration2013-02-09T00:00:002013-03-08T00:00:002false USDfalsefalse$eol_PE10781---1310-K0007_STD_364_20130628_0http://www.sec.gov/CIK0000106040duration2012-06-30T00:00:002013-06-28T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$eol_PE10781---1310-K0007_STD_364_20120629_0http://www.sec.gov/CIK0000106040duration2011-07-02T00:00:002012-06-29T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDfalsefalse$eol_PE10781---1310-K0007_STD_0_20120308_0http://www.sec.gov/CIK0000106040instant2012-03-08T00:00:000001-01-01T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5false USDtruefalse$eol_PE10781---1310-K0007_STD_34_20130801_0_932504x931597http://www.sec.gov/CIK0000106040duration2013-06-29T00:00:002013-08-01T00:00:00falsefalseSubsequent Event [Member]us-gaap_SubsequentEventTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SubsequentEventMemberus-gaap_SubsequentEventTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6false USDtruefalse$eol_PE10781---1310-K0007_STD_364_20130628_0_928576x1048898http://www.sec.gov/CIK0000106040duration2012-06-30T00:00:002013-06-28T00:00:00falsefalseHitachi Global Storage Technologies [Member]us-gaap_BusinessAcquisitionAxisxbrldihttp://xbrl.org/2006/xbrldiwdc_HitachiGlobalStorageTechnologiesMemberus-gaap_BusinessAcquisitionAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7false USDtruefalse$eol_PE10781---1310-K0007_STD_0_20120308_0_928576x1048898http://www.sec.gov/CIK0000106040instant2012-03-08T00:00:000001-01-01T00:00:00falsefalseHitachi Global Storage Technologies [Member]us-gaap_BusinessAcquisitionAxisxbrldihttp://xbrl.org/2006/xbrldiwdc_HitachiGlobalStorageTechnologiesMemberus-gaap_BusinessAcquisitionAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepure0sharesStandardhttp://www.xbrl.org/2003/instanceshares0iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8false USDtruefalse$eol_PE10781---1310-K0007_STD_364_20130628_0_926495x974259_928576x1048898http://www.sec.gov/CIK0000106040duration2012-06-30T00:00:002013-06-28T00:00:00falsefalseHitachi Global Storage Technologies [Member]us-gaap_BusinessAcquisitionAxisxbrldihttp://xbrl.org/2006/xbrldiwdc_HitachiGlobalStorageTechnologiesMemberus-gaap_BusinessAcquisitionAxisexplicitMemberfalsefalsePost-closing assumed pension adjustment [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldiwdc_PostClosingAssumedPensionAdjustmentMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_BusinessAcquisitionLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Business Acquisition [Line Items]2false 4wdc_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceOnewdc_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse46870000004687000000USD$falsetruefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse47000000004700000000USD$falsetruefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.No definition available.false2Purchase price of the Acquisition3false 4wdc_PortionOfDebtAndCashInPurchasePricewdc_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse37000000003700000000falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryPortion of debt and cash in purchase price.No definition available.false2Portion of debt in purchase price4false 4wdc_NumberOfShareOfCommonStockIssuedRelatedToAcquisitionwdc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse2500000025falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesNumber of share of common stock issued related to acquisition.No definition available.false1Company newly issued common stock5false 4wdc_FairValueOfSharesIssuedForAcquisitionwdc_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse877000000877000000falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryFair value of shares issued for acquisition.No definition available.false2Fair value of shares issued for Acquisition6false 4wdc_DiscountPercentageTakenOnValueOfShareswdc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7truetruefalse0.100.10falsefalsefalse8falsetruefalse00falsefalsefalsenum:percentItemTypepureDiscount percentage taken on value of shares.No definition available.false0Percentage of discount used for calculation of fair value7false 4wdc_NumberOfYearsOfTransferRestrictionOnSharesIssuedForAcquisitionwdc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse001 yearfalsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaNumber of years of transfer restriction on shares issued for acquisition.No definition available.false0Number of year of transfer restriction8false 4wdc_AcquisitionPurchasePriceAdjustmentwdc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse2700000027000000falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAcquisition net purchase price adjustments.No definition available.false2Cash Acquisition net purchase price9false 4wdc_AcquisitionWorkingCapitalPurchasePriceAdjustmentwdc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse3700000037000000falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAcquisition working capital purchase price adjustment.No definition available.false2Post-closing Adjustment related to changes in working capital10false 4wdc_AcquisitionPostClosingAssumedPensionAdjustmentwdc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1000000010000000falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAcquisition post-closing assumed pension adjustment.No definition available.false2Acquisition post-closing assumed pension adjustment11false 4us-gaap_Goodwillus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse19540000001954000000falsefalsefalse3truefalsefalse19750000001975000000falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse18000000001800000000falsefalsefalse7truefalsefalse18030000001803000000falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 false2Value allocated to goodwill12false 4wdc_BusinessAcquisitionPeriodOfMeasurementwdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse0012 monthsfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaBusiness acquisition period of measurement.No definition available.false0Period of measurement13false 4us-gaap_GoodwillPeriodIncreaseDecreaseus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse2100000021000000falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 false2Net decrease in goodwill14false 4us-gaap_GoodwillPurchaseAccountingAdjustmentsus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse3700000037000000falsefalsefalse7falsefalsefalse00falsefalsefalse8truefalsefalse1000000010000000falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e961-128460 false2Net increase (decrease) in goodwill15false 4us-gaap_IncreaseDecreaseInIntangibleAssetsCurrentus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse10000001000000falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe increase (decrease) during the reporting period in intangible assets (for example patents and licenses).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 false2Increase in intangible assets16false 4wdc_GoodwillPurchaseAccountingAdjustmentsIncreaseInDeferredIncomeTaxwdc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse50000005000000falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryGoodwill purchase accounting adjustments increase in deferred income tax.No definition available.false2Increase in deferred income taxes17false 4wdc_InsuranceRecoveriesAndOtherCostReimbursementwdc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse2100000021000000USD$falsetruefalse4falsefalsefalse00falsefalsefalse5truefalsefalse4500000045000000USD$falsetruefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryInsurance recoveries and other cost reimbursements received related to the flood.No definition available.false2Insurance recovery related to facilities acquired in connection with the acquisition of TSDTfalseAcquisition - Additional Information (Detail) (USD $)NoRoundingMillionsUnKnownUnKnowntruefalsefalseSheethttp://www.westerndigital.com/taxonomy/role/DisclosureAcquisitionAdditionalInformation817