2.4.0.8170 - Disclosure - Foreign Exchange Contracts - Additional Information (Detail)truefalsefalse1false 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$2false USDfalsefalse$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$1true 1us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Derivative Instruments And Hedging Activities Disclosure [Abstract]2false 2wdc_ForeignCurrencyContractsMaximumMaturityTermwdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00Less than 12 monthsfalsefalsefalse2falsefalsefalse00Less than 12 monthsfalsefalsefalseus-types:durationStringItemTypenormalizedstringForeign currency contracts maximum maturity term.No definition available.false0Contract maturity dates3false 2us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Monthsus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse4600000046000000USD$falsetruefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 false2Unrealized gains expected to be reclassified into earnings4false 2wdc_ForeignExchangeContractsOpenedDuringPeriodwdc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse60000000006000000000falsefalsefalse2truefalsefalse32000000003200000000falsefalsefalsexbrli:monetaryItemTypemonetaryTotal dollar amount of foreign exchange contracts opened during the period.No definition available.false2Foreign exchange contracts opened during the period by company5false 2wdc_ForeignExchangeContractsClosedDuringPeriodwdc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse45000000004500000000USD$falsetruefalse2truefalsefalse32000000003200000000USD$falsetruefalsexbrli:monetaryItemTypemonetaryTotal dollar amount of foreign exchange contracts closed during the period.No definition available.false2Foreign exchange contracts closed during the period by companyfalseForeign Exchange Contracts - Additional Information (Detail) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.westerndigital.com/taxonomy/role/DisclosureForeignExchangeContractsAdditionalInformation25