2.4.0.8 HtmlAndXml 261 504 1 false 70 0 false 6 false false R1.htm 101 - Document - Document and Entity Information Sheet http://www.westerndigital.com/taxonomy/role/DocumentDocumentandEntityInformation Document and Entity Information R1.xml true false R2.htm 103 - Statement - Consolidated Balance Sheets Sheet http://www.westerndigital.com/taxonomy/role/StatementOfFinancialPositionClassified Consolidated Balance Sheets R2.xml false false R3.htm 104 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.westerndigital.com/taxonomy/role/StatementOfFinancialPositionClassifiedParenthetical Consolidated Balance Sheets (Parenthetical) R3.xml false false R4.htm 105 - Statement - Consolidated Statements of Income Sheet http://www.westerndigital.com/taxonomy/role/StatementOfIncome Consolidated Statements of Income R4.xml false false R5.htm 106 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.westerndigital.com/taxonomy/role/StatementOfOtherComprehensiveIncome Consolidated Statements of Comprehensive Income R5.xml false false R6.htm 107 - Statement - Consolidated Statements of Cash Flows Sheet http://www.westerndigital.com/taxonomy/role/StatementOfCashFlowsIndirect Consolidated Statements of Cash Flows R6.xml false false R7.htm 108 - Statement - Consolidated Statements of Shareholders' Equity Sheet http://www.westerndigital.com/taxonomy/role/StatementOfShareholdersEquityAndOtherComprehensiveIncome Consolidated Statements of Shareholders' Equity R7.xml false false R8.htm 109 - Disclosure - Organization and Summary of Significant Accounting Policies Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock Organization and Summary of Significant Accounting Policies R8.xml false false R9.htm 110 - Disclosure - Supplemental Financial Statement Data Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsSupplementalBalanceSheetDisclosuresTextBlock Supplemental Financial Statement Data R9.xml false false R10.htm 111 - Disclosure - Debt Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock Debt R10.xml false false R11.htm 112 - Disclosure - Commitments and Contingencies Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock Commitments and Contingencies R11.xml false false R12.htm 113 - Disclosure - Legal Proceedings Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsLegalMattersAndContingenciesTextBlock Legal Proceedings R12.xml false false R13.htm 114 - Disclosure - Business Segment, Geographic Information and Major Customers Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsBusinessSegmentGeographicInformationAndMajorCustomersTextBlock Business Segment, Geographic Information and Major Customers R13.xml false false R14.htm 115 - Disclosure - Western Digital Corporation 401(k) Plan Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsDefinedContributionPlanDisclosureTextBlock Western Digital Corporation 401(k) Plan R14.xml false false R15.htm 116 - Disclosure - Shareholders' Equity Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsShareholdersEquityAndShareBasedPaymentsTextBlock Shareholders' Equity R15.xml false false R16.htm 117 - Disclosure - Income Taxes Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock Income Taxes R16.xml false false R17.htm 118 - Disclosure - Fair Value Measurements Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock Fair Value Measurements R17.xml false false R18.htm 119 - Disclosure - Foreign Exchange Contracts Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock Foreign Exchange Contracts R18.xml false false R19.htm 120 - Disclosure - Other Intangible Assets Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsIntangibleAssetsDisclosureTextBlock Other Intangible Assets R19.xml false false R20.htm 121 - Disclosure - Pensions and Other Post-retirement Benefit Plans Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlock Pensions and Other Post-retirement Benefit Plans R20.xml false false R21.htm 122 - Disclosure - Acquisition Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock Acquisition R21.xml false false R22.htm 123 - Disclosure - Thailand Flooding Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsUnusualOrInfrequentItemsDisclosureTextBlock Thailand Flooding R22.xml false false R23.htm 124 - Disclosure - Employee Termination Benefits and Other Charges Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsEmployeeTerminationBenefitsAndOtherChargesDisclosureTextBlock Employee Termination Benefits and Other Charges R23.xml false false R24.htm 125 - Disclosure - Quarterly Results of Operations Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlock Quarterly Results of Operations R24.xml false false R25.htm 126 - Disclosure - Consolidated Valuation and Qualifying Accounts Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock Consolidated Valuation and Qualifying Accounts R25.xml false false R26.htm 127 - Disclosure - Organization and Summary of Significant Accounting Policies (Policies) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlockPolicies Organization and Summary of Significant Accounting Policies (Policies) R26.xml false false R27.htm 128 - Disclosure - Organization and Summary of Significant Accounting Policies (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlockTables Organization and Summary of Significant Accounting Policies (Tables) R27.xml false false R28.htm 129 - Disclosure - Supplemental Financial Statement Data (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsSupplementalBalanceSheetDisclosuresTextBlockTables Supplemental Financial Statement Data (Tables) R28.xml false false R29.htm 130 - Disclosure - Debt (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables Debt (Tables) R29.xml false false R30.htm 131 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlockTables Commitments and Contingencies (Tables) R30.xml false false R31.htm 132 - Disclosure - Business Segment, Geographic Information and Major Customers (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsBusinessSegmentGeographicInformationAndMajorCustomersTextBlockTables Business Segment, Geographic Information and Major Customers (Tables) R31.xml false false R32.htm 133 - Disclosure - Shareholders' Equity (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsShareholdersEquityAndShareBasedPaymentsTextBlockTables Shareholders' Equity (Tables) R32.xml false false R33.htm 134 - Disclosure - Income Taxes (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlockTables Income Taxes (Tables) R33.xml false false R34.htm 135 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlockTables Fair Value Measurements (Tables) R34.xml false false R35.htm 136 - Disclosure - Foreign Exchange Contracts (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlockTables Foreign Exchange Contracts (Tables) R35.xml false false R36.htm 137 - Disclosure - Other Intangible Assets (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsIntangibleAssetsDisclosureTextBlockTables Other Intangible Assets (Tables) R36.xml false false R37.htm 138 - Disclosure - Pensions and Other Post-retirement Benefit Plans (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlockTables Pensions and Other Post-retirement Benefit Plans (Tables) R37.xml false false R38.htm 139 - Disclosure - Acquisition (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlockTables Acquisition (Tables) R38.xml false false R39.htm 140 - Disclosure - Employee Termination Benefits and Other Charges (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsEmployeeTerminationBenefitsAndOtherChargesDisclosureTextBlockTables Employee Termination Benefits and Other Charges (Tables) R39.xml false false R40.htm 141 - Disclosure - Quarterly Results of Operations (Tables) Sheet http://www.westerndigital.com/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlockTables Quarterly Results of Operations (Tables) R40.xml false false R41.htm 142 - Disclosure - Organization and Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureOrganizationAndSummaryOfSignificantAccountingPoliciesAdditionalInformation Organization and Summary of Significant Accounting Policies - Additional Information (Detail) R41.xml false false R42.htm 143 - Disclosure - Organization and Summary of Significant Accounting Policies - Computation of Basic and Diluted Income Per Common Share (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureOrganizationAndSummaryOfSignificantAccountingPoliciesComputationOfBasicAndDilutedIncomePerCommonShare Organization and Summary of Significant Accounting Policies - Computation of Basic and Diluted Income Per Common Share (Detail) R42.xml false false R43.htm 144 - Disclosure - Organization and Summary of Significant Accounting Policies - Changes in the Balances of Each Component of Accumulated Comprehensive Income (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureOrganizationAndSummaryOfSignificantAccountingPoliciesChangesInTheBalancesOfEachComponentOfAccumulatedComprehensiveIncome Organization and Summary of Significant Accounting Policies - Changes in the Balances of Each Component of Accumulated Comprehensive Income (Detail) R43.xml false false R44.htm 145 - Disclosure - Supplemental Financial Statement Data - Inventories and Property, Plant and Equipment (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureSupplementalFinancialStatementDataInventoriesAndPropertyPlantAndEquipment Supplemental Financial Statement Data - Inventories and Property, Plant and Equipment (Detail) R44.xml false false R45.htm 146 - Disclosure - Debt - Long-Term Debt (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureDebtLongTermDebt Debt - Long-Term Debt (Detail) R45.xml false false R46.htm 147 - Disclosure - Debt - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureDebtAdditionalInformation Debt - Additional Information (Detail) R46.xml false false R47.htm 148 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformation Commitments and Contingencies - Additional Information (Detail) R47.xml false false R48.htm 149 - Disclosure - Commitments and Contingencies - Future Minimum Lease Payments under Operating Leases (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureCommitmentsAndContingenciesFutureMinimumLeasePaymentsUnderOperatingLeases Commitments and Contingencies - Future Minimum Lease Payments under Operating Leases (Detail) R48.xml false false R49.htm 150 - Disclosure - Commitments and Contingencies - Changes in Accrual Warranty (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureCommitmentsAndContingenciesChangesInAccrualWarranty Commitments and Contingencies - Changes in Accrual Warranty (Detail) R49.xml false false R50.htm 151 - Disclosure - Legal Proceedings - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureLegalProceedingsAdditionalInformation Legal Proceedings - Additional Information (Detail) R50.xml false false R51.htm 152 - Disclosure - Business Segment, Geographic Information and Major Customers - Summarize Table of Operations by Geographic Area (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureBusinessSegmentGeographicInformationAndMajorCustomersSummarizeTableOfOperationsByGeographicArea Business Segment, Geographic Information and Major Customers - Summarize Table of Operations by Geographic Area (Detail) R51.xml false false R52.htm 153 - Disclosure - Business Segment, Geographic Information and Major Customers - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureBusinessSegmentGeographicInformationAndMajorCustomersAdditionalInformation Business Segment, Geographic Information and Major Customers - Additional Information (Detail) R52.xml false false R53.htm 154 - Disclosure - Western Digital Corporation 401(k) Plan - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureWesternDigitalCorporation401kPlanAdditionalInformation Western Digital Corporation 401(k) Plan - Additional Information (Detail) R53.xml false false R54.htm 155 - Disclosure - Shareholders' Equity - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureShareholdersEquityAdditionalInformation Shareholders' Equity - Additional Information (Detail) R54.xml false false R55.htm 156 - Disclosure - Shareholders' Equity - Stock Option Activity (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureShareholdersEquityStockOptionActivity Shareholders' Equity - Stock Option Activity (Detail) R55.xml false false R56.htm 157 - Disclosure - Shareholders' Equity - Options Outstanding and Exercisable Under the Stock Plans (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureShareholdersEquityOptionsOutstandingAndExercisableUnderTheStockPlans Shareholders' Equity - Options Outstanding and Exercisable Under the Stock Plans (Detail) R56.xml false false R57.htm 158 - Disclosure - Shareholders' Equity - Restricted Stock Units (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureShareholdersEquityRestrictedStockUnits Shareholders' Equity - Restricted Stock Units (Detail) R57.xml false false R58.htm 159 - Disclosure - Shareholders' Equity - Fair Value of Stock Options Granted (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureShareholdersEquityFairValueOfStockOptionsGranted Shareholders' Equity - Fair Value of Stock Options Granted (Detail) R58.xml false false R59.htm 160 - Disclosure - Shareholders' Equity - Fair Values of All Employee Stock Purchase Plan Rights Granted (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureShareholdersEquityFairValuesOfAllEmployeeStockPurchasePlanRightsGranted Shareholders' Equity - Fair Values of All Employee Stock Purchase Plan Rights Granted (Detail) R59.xml false false R60.htm 161 - Disclosure - Shareholders' Equity - Summarizes Table of All Shares of Common Stock Reserved for Issuance (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureShareholdersEquitySummarizesTableOfAllSharesOfCommonStockReservedForIssuance Shareholders' Equity - Summarizes Table of All Shares of Common Stock Reserved for Issuance (Detail) R60.xml false false R61.htm 162 - Disclosure - Income Taxes - Domestic and Foreign Components of Income Before Income Taxes (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureIncomeTaxesDomesticAndForeignComponentsOfIncomeBeforeIncomeTaxes Income Taxes - Domestic and Foreign Components of Income Before Income Taxes (Detail) R61.xml false false R62.htm 163 - Disclosure - Income Taxes - Components of Provision for Income Taxes (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureIncomeTaxesComponentsOfProvisionForIncomeTaxes Income Taxes - Components of Provision for Income Taxes (Detail) R62.xml false false R63.htm 164 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureIncomeTaxesAdditionalInformation Income Taxes - Additional Information (Detail) R63.xml false false R64.htm 165 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilities Income Taxes - Deferred Tax Assets and Liabilities (Detail) R64.xml false false R65.htm 166 - Disclosure - Income Taxes - U.S. Federal Statutory Rate to Company's Effective Tax Rate (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureIncomeTaxesUSFederalStatutoryRateToCompanysEffectiveTaxRate Income Taxes - U.S. Federal Statutory Rate to Company's Effective Tax Rate (Detail) R65.xml false false R66.htm 167 - Disclosure - Income Taxes - Total Amounts of Unrecognized Tax Benefits (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureIncomeTaxesTotalAmountsOfUnrecognizedTaxBenefits Income Taxes - Total Amounts of Unrecognized Tax Benefits (Detail) R66.xml false false R67.htm 168 - Disclosure - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) R67.xml false false R68.htm 169 - Disclosure - Fair Value Measurements - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureFairValueMeasurementsAdditionalInformation Fair Value Measurements - Additional Information (Detail) R68.xml false false R69.htm 170 - Disclosure - Foreign Exchange Contracts - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureForeignExchangeContractsAdditionalInformation Foreign Exchange Contracts - Additional Information (Detail) R69.xml false false R70.htm 171 - Disclosure - Foreign Exchange Contracts - Fair Value and Balance Sheet Location of Contracts (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureForeignExchangeContractsFairValueAndBalanceSheetLocationOfContracts Foreign Exchange Contracts - Fair Value and Balance Sheet Location of Contracts (Detail) R70.xml false false R71.htm 172 - Disclosure - Foreign Exchange Contracts - Gains (Losses) of Derivatives in Cash Flow Hedging Relationships (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureForeignExchangeContractsGainsLossesOfDerivativesInCashFlowHedgingRelationships Foreign Exchange Contracts - Gains (Losses) of Derivatives in Cash Flow Hedging Relationships (Detail) R71.xml false false R72.htm 173 - Disclosure - Other Intangible Assets - Other Intangible Assets (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureOtherIntangibleAssetsOtherIntangibleAssets Other Intangible Assets - Other Intangible Assets (Detail) R72.xml false false R73.htm 174 - Disclosure - Other Intangible Assets - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureOtherIntangibleAssetsAdditionalInformation Other Intangible Assets - Additional Information (Detail) R73.xml false false R74.htm 175 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Obligations and Funded Status (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosurePensionsAndOtherPostretirementBenefitPlansObligationsAndFundedStatus Pensions and Other Post-retirement Benefit Plans - Obligations and Funded Status (Detail) R74.xml false false R75.htm 176 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Unfunded Amounts Recognized on Consolidated Balance Sheets (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosurePensionsAndOtherPostretirementBenefitPlansUnfundedAmountsRecognizedOnConsolidatedBalanceSheets Pensions and Other Post-retirement Benefit Plans - Unfunded Amounts Recognized on Consolidated Balance Sheets (Detail) R75.xml false false R76.htm 177 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosurePensionsAndOtherPostretirementBenefitPlansAdditionalInformation Pensions and Other Post-retirement Benefit Plans - Additional Information (Detail) R76.xml false false R77.htm 178 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Obligations (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosurePensionsAndOtherPostretirementBenefitPlansWeightedAverageActuarialAssumptionsUsedToDetermineBenefitObligations Pensions and Other Post-retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Obligations (Detail) R77.xml false false R78.htm 179 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Costs (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosurePensionsAndOtherPostretirementBenefitPlansWeightedAverageActuarialAssumptionsUsedToDetermineBenefitCosts Pensions and Other Post-retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Costs (Detail) R78.xml false false R79.htm 180 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Japanese Defined Benefit Pension Plans' Major Asset Categories and Their Associated Fair Values (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosurePensionsAndOtherPostretirementBenefitPlansJapaneseDefinedBenefitPensionPlansMajorAssetCategoriesAndTheirAssociatedFairValues Pensions and Other Post-retirement Benefit Plans - Japanese Defined Benefit Pension Plans' Major Asset Categories and Their Associated Fair Values (Detail) R79.xml false false R80.htm 181 - Disclosure - Acquisition - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureAcquisitionAdditionalInformation Acquisition - Additional Information (Detail) R80.xml false false R81.htm 182 - Disclosure - Acquisition - Purchase Price of Business Combination (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureAcquisitionPurchasePriceOfBusinessCombination Acquisition - Purchase Price of Business Combination (Detail) R81.xml false false R82.htm 183 - Disclosure - Acquisition - Purchase Price Allocation (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureAcquisitionPurchasePriceAllocation Acquisition - Purchase Price Allocation (Detail) R82.xml false false R83.htm 184 - Disclosure - Thailand Flooding - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureThailandFloodingAdditionalInformation Thailand Flooding - Additional Information (Detail) R83.xml false false R84.htm 185 - Disclosure - Employee Termination Benefits and Other Charges - Additional Information (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureEmployeeTerminationBenefitsAndOtherChargesAdditionalInformation Employee Termination Benefits and Other Charges - Additional Information (Detail) R84.xml false false R85.htm 186 - Disclosure - Employee Termination Benefits and Other Charges - Schedule of Employee Termination Benefits and Other Charges (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureEmployeeTerminationBenefitsAndOtherChargesScheduleOfEmployeeTerminationBenefitsAndOtherCharges Employee Termination Benefits and Other Charges - Schedule of Employee Termination Benefits and Other Charges (Detail) R85.xml false false R86.htm 187 - Disclosure - Quarterly Results of Operations - Quarterly Results of Operations (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureQuarterlyResultsOfOperationsQuarterlyResultsOfOperations Quarterly Results of Operations - Quarterly Results of Operations (Detail) R86.xml false false R87.htm 188 - Disclosure - Quarterly Results of Operations - Quarterly Results of Operations (Parenthetical) (Detail) Sheet http://www.westerndigital.com/taxonomy/role/DisclosureQuarterlyResultsOfOperationsQuarterlyResultsOfOperationsParenthetical Quarterly Results of Operations - Quarterly Results of Operations (Parenthetical) (Detail) R87.xml false false R88.htm 189 - Schedule - Consolidated Valuation and Qualifying Accounts (Detail) Sheet http://www.westerndigital.com/taxonomy/role/ScheduleConsolidatedValuationAndQualifyingAccounts Consolidated Valuation and Qualifying Accounts (Detail) R88.xml false false All Reports Book All Reports Element us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber had a mix of decimals attribute values: -5 0. Element us-gaap_TreasuryStockSharesAcquired had a mix of decimals attribute values: -6 -5. Element wdc_ArbitrationAwardInterestRate had a mix of decimals attribute values: 0 2. Element wdc_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceOne had a mix of decimals attribute values: -8 -6. 'Monetary' elements on report '142 - Disclosure - Organization and Summary of Significant Accounting Policies - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '147 - Disclosure - Debt - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '155 - Disclosure - Shareholders' Equity - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '164 - Disclosure - Income Taxes - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '170 - Disclosure - Foreign Exchange Contracts - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '181 - Disclosure - Acquisition - Additional Information (Detail)' had a mix of different decimal attribute values. Process Flow-Through: 103 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Jul. 01, 2011' Process Flow-Through: Removing column 'Jul. 02, 2010' Process Flow-Through: 104 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: 105 - Statement - Consolidated Statements of Income Process Flow-Through: Removing column '3 Months Ended Jun. 28, 2013' Process Flow-Through: Removing column '3 Months Ended Mar. 29, 2013' Process Flow-Through: Removing column '3 Months Ended Dec. 28, 2012' Process Flow-Through: Removing column '3 Months Ended Sep. 28, 2012' Process Flow-Through: Removing column '3 Months Ended Jun. 29, 2012' Process Flow-Through: Removing column '3 Months Ended Mar. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Dec. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: 106 - Statement - Consolidated Statements of Comprehensive Income Process Flow-Through: Removing column '3 Months Ended Jun. 28, 2013' Process Flow-Through: Removing column '3 Months Ended Mar. 29, 2013' Process Flow-Through: Removing column '3 Months Ended Dec. 28, 2012' Process Flow-Through: Removing column '3 Months Ended Sep. 28, 2012' Process Flow-Through: Removing column '3 Months Ended Jun. 29, 2012' Process Flow-Through: Removing column '3 Months Ended Mar. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Dec. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: 107 - Statement - Consolidated Statements of Cash Flows wdc-20130628.xml wdc-20130628.xsd wdc-20130628_cal.xml wdc-20130628_def.xml wdc-20130628_lab.xml wdc-20130628_pre.xml true true