2.4.0.8153 - Disclosure - Business Segment, Geographic Information and Major Customers - Additional Information (Detail)truefalsefalse1false falsefalseeol_PE10781---1310-K0007_STD_364_20130628_0http://www.sec.gov/CIK0000106040duration2012-06-30T00:00:002013-06-28T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure02false falsefalseeol_PE10781---1310-K0007_STD_364_20120629_0http://www.sec.gov/CIK0000106040duration2011-07-02T00:00:002012-06-29T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure03false falsefalseeol_PE10781---1310-K0007_STD_364_20110701_0http://www.sec.gov/CIK0000106040duration2010-07-03T00:00:002011-07-01T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure01true 1us-gaap_SegmentReportingAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Segment Reporting [Abstract]2false 2wdc_EntityWideRevenueMajorCustomerPercentageTwowdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.100.10falsefalsefalse2truetruefalse0.110.11falsefalsefalse3truetruefalse0.100.10falsefalsefalsenum:percentItemTypepurePercentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.No definition available.false0Percentage of contribution of customer in company's net revenue3false 2wdc_PercentageThresholdOfCompanysNetRevenueToDetermineMajorCustomerwdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse0010%, or morefalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse0010%, or morefalsefalsefalsexbrli:stringItemTypestringPercentage Threshold Of Companys Net Revenue To Determine Major CustomerNo definition available.false0Maximum contribution of customer in company's net revenue4false 2wdc_PercentageOfNetRevenueFromTenMajorCustomerswdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.440.44falsefalsefalse2truetruefalse0.500.50falsefalsefalse3truetruefalse0.490.49falsefalsefalsenum:percentItemTypepurePercentage of net revenue from ten major customers.No definition available.false0Percentage of sales to company's net revenuefalseBusiness Segment, Geographic Information and Major Customers - Additional Information (Detail)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.westerndigital.com/taxonomy/role/DisclosureBusinessSegmentGeographicInformationAndMajorCustomersAdditionalInformation34