2.4.0.8154 - Disclosure - Western Digital Corporation 401(k) Plan - Additional Information (Detail)truefalsefalse1false USDfalsefalse$eol_PE10781---1310-K0007_STD_364_20130628_0http://www.sec.gov/CIK0000106040duration2012-06-30T00:00:002013-06-28T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure0iso4217_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$3false USDfalsefalse$eol_PE10781---1310-K0007_STD_364_20110701_0http://www.sec.gov/CIK0000106040duration2010-07-03T00:00:002011-07-01T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 1us-gaap_CompensationAndRetirementDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Compensation And Retirement Disclosure [Abstract]2false 2wdc_TermsOfEmployerContributionwdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00The Company has adopted the Western Digital Corporation 401(k) Plan (the “Plan”). The Plan covers substantially all domestic employees, subject to certain eligibility requirements. The Company makes a basic matching contribution on behalf of each participating eligible employee equal to fifty percent (50%) of the eligible participant’s pre-tax contributions for the contribution cycle not to exceed 5% of the eligible participant’s compensation; provided, however, that each eligible participant shall receive a minimum annual basic matching contribution equal to fifty percent (50%) of the first $4,000 of pre-tax contributions for any calendar year.falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringTerms Of Employer ContributionNo definition available.false0Terms of employer contribution3false 2us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.500.50falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00falsefalsefalsenum:percentItemTypepurePercentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.No definition available.false0Defined contribution plan, employer matching contribution, percent4false 2wdc_MaximumPercentageOfCompensationEligibleForEmployerMatchwdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.050.05falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00falsefalsefalsenum:percentItemTypepureMaximum Percentage Of Compensation Eligible For Employer MatchNo definition available.false0Maximum percentage of compensation eligible for employer match5false 2wdc_MinimumBasisOfEmployeeContributionsEligibleForEmployerMatchwdc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse40004000USD$falsetruefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryMinimum Basis Of Employee Contributions Eligible For Employer MatchNo definition available.false2Matching contribution of first amount6false 2wdc_EligibleCompensationPercentagewdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.050.05falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00falsefalsefalsenum:percentItemTypepureAmount of income savings eligible for annual matching contribution.No definition available.false0Eligible compensation percentage7false 2wdc_MinimumAmountOfMatchingAnnualContributionwdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.0250.025falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00falsefalsefalsenum:percentItemTypepureMinimum Amount Of Matching Annual ContributionNo definition available.false0Minimum amount of matching annual contribution8false 2wdc_CompanyContributionsVestPeriodwdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse005 yearsfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaCompany Contributions Vest PeriodNo definition available.false0Company contributions vest period9false 2us-gaap_DefinedBenefitPlanContributionsByEmployerus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1900000019000000USD$falsetruefalse2truefalsefalse1200000012000000USD$falsetruefalse3truefalsefalse90000009000000USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe increase in the fair value of plan assets from contributions made by the employer.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 false2Company contributionsfalseWestern Digital Corporation 401(k) Plan - Additional Information (Detail) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.westerndigital.com/taxonomy/role/DisclosureWesternDigitalCorporation401kPlanAdditionalInformation39