3.26.1 html 375 623 1 false 116 0 false 11 false false R1.htm 0000001 - Document - Cover Page Sheet http://www.wdc.com/role/CoverPage Cover Page Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://www.wdc.com/role/AuditInformation Audit Information Cover 2 false false R3.htm 9952151 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://www.wdc.com/role/CONSOLIDATEDBALANCESHEETS CONSOLIDATED BALANCE SHEETS Statements 3 false false R4.htm 9952152 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.wdc.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 9952153 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Sheet http://www.wdc.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statements 5 false false R6.htm 9952154 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.wdc.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 6 false false R7.htm 9952155 - Statement - CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND SHAREHOLDERS’ EQUITY Sheet http://www.wdc.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSTOCKANDSHAREHOLDERSEQUITY CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND SHAREHOLDERS’ EQUITY Statements 7 false false R8.htm 9952156 - Disclosure - Organization and Basis of Presentation Sheet http://www.wdc.com/role/OrganizationandBasisofPresentation Organization and Basis of Presentation Notes 8 false false R9.htm 9952157 - Disclosure - Recent Accounting Pronouncements Sheet http://www.wdc.com/role/RecentAccountingPronouncements Recent Accounting Pronouncements Notes 9 false false R10.htm 9952158 - Disclosure - Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting Sheet http://www.wdc.com/role/DisaggregatedRevenueGeographicInformationConcentrationsofRiskandSegmentReporting Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting Notes 10 false false R11.htm 9952159 - Disclosure - Discontinued Operations Sheet http://www.wdc.com/role/DiscontinuedOperations Discontinued Operations Notes 11 false false R12.htm 9952160 - Disclosure - Supplemental Financial Statement Data Sheet http://www.wdc.com/role/SupplementalFinancialStatementData Supplemental Financial Statement Data Notes 12 false false R13.htm 9952161 - Disclosure - Fair Value Measurements and Investments Sheet http://www.wdc.com/role/FairValueMeasurementsandInvestments Fair Value Measurements and Investments Notes 13 false false R14.htm 9952162 - Disclosure - Debt Sheet http://www.wdc.com/role/Debt Debt Notes 14 false false R15.htm 9952163 - Disclosure - Pension and Other Post-Retirement Benefit Plans Sheet http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlans Pension and Other Post-Retirement Benefit Plans Notes 15 false false R16.htm 9952164 - Disclosure - Leases and Other Commitments Sheet http://www.wdc.com/role/LeasesandOtherCommitments Leases and Other Commitments Notes 16 false false R17.htm 9952165 - Disclosure - Shareholders’ Equity and Convertible Preferred Stock Sheet http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStock Shareholders’ Equity and Convertible Preferred Stock Notes 17 false false R18.htm 9952166 - Disclosure - Income Taxes Sheet http://www.wdc.com/role/IncomeTaxes Income Taxes Notes 18 false false R19.htm 9952167 - Disclosure - Business Realignment Charges (Credits) Sheet http://www.wdc.com/role/BusinessRealignmentChargesCredits Business Realignment Charges (Credits) Notes 19 false false R20.htm 9952168 - Disclosure - Net Income (Loss) Per Common Share Sheet http://www.wdc.com/role/NetIncomeLossPerCommonShare Net Income (Loss) Per Common Share Notes 20 false false R21.htm 9952169 - Disclosure - Legal Proceedings Sheet http://www.wdc.com/role/LegalProceedings Legal Proceedings Notes 21 false false R22.htm 9952170 - Disclosure - Western Digital Corporation 401(k) Plan Sheet http://www.wdc.com/role/WesternDigitalCorporation401kPlan Western Digital Corporation 401(k) Plan Notes 22 false false R23.htm 9952171 - Disclosure - Supplier Finance Program Sheet http://www.wdc.com/role/SupplierFinanceProgram Supplier Finance Program Notes 23 false false R24.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 24 false false R25.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 25 false false R26.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 26 false false R27.htm 9955511 - Disclosure - Organization and Basis of Presentation (Policies) Sheet http://www.wdc.com/role/OrganizationandBasisofPresentationPolicies Organization and Basis of Presentation (Policies) Policies http://www.wdc.com/role/RecentAccountingPronouncements 27 false false R28.htm 9955512 - Disclosure - Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting (Tables) Sheet http://www.wdc.com/role/DisaggregatedRevenueGeographicInformationConcentrationsofRiskandSegmentReportingTables Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting (Tables) Tables http://www.wdc.com/role/DisaggregatedRevenueGeographicInformationConcentrationsofRiskandSegmentReporting 28 false false R29.htm 9955513 - Disclosure - Discontinued Operations (Tables) Sheet http://www.wdc.com/role/DiscontinuedOperationsTables Discontinued Operations (Tables) Tables http://www.wdc.com/role/DiscontinuedOperations 29 false false R30.htm 9955514 - Disclosure - Supplemental Financial Statement Data (Tables) Sheet http://www.wdc.com/role/SupplementalFinancialStatementDataTables Supplemental Financial Statement Data (Tables) Tables http://www.wdc.com/role/SupplementalFinancialStatementData 30 false false R31.htm 9955515 - Disclosure - Fair Value Measurements and Investments (Tables) Sheet http://www.wdc.com/role/FairValueMeasurementsandInvestmentsTables Fair Value Measurements and Investments (Tables) Tables http://www.wdc.com/role/FairValueMeasurementsandInvestments 31 false false R32.htm 9955516 - Disclosure - Debt (Tables) Sheet http://www.wdc.com/role/DebtTables Debt (Tables) Tables http://www.wdc.com/role/Debt 32 false false R33.htm 9955517 - Disclosure - Pension and Other Post-Retirement Benefit Plans (Tables) Sheet http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansTables Pension and Other Post-Retirement Benefit Plans (Tables) Tables http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlans 33 false false R34.htm 9955518 - Disclosure - Leases and Other Commitments (Tables) Sheet http://www.wdc.com/role/LeasesandOtherCommitmentsTables Leases and Other Commitments (Tables) Tables http://www.wdc.com/role/LeasesandOtherCommitments 34 false false R35.htm 9955519 - Disclosure - Shareholders’ Equity and Convertible Preferred Stock (Tables) Sheet http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockTables Shareholders’ Equity and Convertible Preferred Stock (Tables) Tables http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStock 35 false false R36.htm 9955520 - Disclosure - Income Taxes (Tables) Sheet http://www.wdc.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.wdc.com/role/IncomeTaxes 36 false false R37.htm 9955521 - Disclosure - Business Realignment Charges (Credits) (Tables) Sheet http://www.wdc.com/role/BusinessRealignmentChargesCreditsTables Business Realignment Charges (Credits) (Tables) Tables http://www.wdc.com/role/BusinessRealignmentChargesCredits 37 false false R38.htm 9955522 - Disclosure - Net Income (Loss) Per Common Share (Tables) Sheet http://www.wdc.com/role/NetIncomeLossPerCommonShareTables Net Income (Loss) Per Common Share (Tables) Tables http://www.wdc.com/role/NetIncomeLossPerCommonShare 38 false false R39.htm 9955523 - Disclosure - Supplier Finance Program (Tables) Sheet http://www.wdc.com/role/SupplierFinanceProgramTables Supplier Finance Program (Tables) Tables http://www.wdc.com/role/SupplierFinanceProgram 39 false false R40.htm 9955524 - Disclosure - Organization and Basis of Presentation - Additional Information (Details) Sheet http://www.wdc.com/role/OrganizationandBasisofPresentationAdditionalInformationDetails Organization and Basis of Presentation - Additional Information (Details) Details 40 false false R41.htm 9955525 - Disclosure - Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Disaggregation of Revenue (Details) Sheet http://www.wdc.com/role/DisaggregatedRevenueGeographicInformationConcentrationsofRiskandSegmentReportingDisaggregationofRevenueDetails Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Disaggregation of Revenue (Details) Details 41 false false R42.htm 9955526 - Disclosure - Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Revenue by Geography (Details) Sheet http://www.wdc.com/role/DisaggregatedRevenueGeographicInformationConcentrationsofRiskandSegmentReportingRevenuebyGeographyDetails Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Revenue by Geography (Details) Details http://www.wdc.com/role/DisaggregatedRevenueGeographicInformationConcentrationsofRiskandSegmentReportingTables 42 false false R43.htm 9955527 - Disclosure - Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Long-lived Assets by Geography (Details) Sheet http://www.wdc.com/role/DisaggregatedRevenueGeographicInformationConcentrationsofRiskandSegmentReportingLonglivedAssetsbyGeographyDetails Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Long-lived Assets by Geography (Details) Details 43 false false R44.htm 9955528 - Disclosure - Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Additional Information (Details) Sheet http://www.wdc.com/role/DisaggregatedRevenueGeographicInformationConcentrationsofRiskandSegmentReportingAdditionalInformationDetails Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Additional Information (Details) Details 44 false false R45.htm 9955529 - Disclosure - Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Schedule of Segment Reporting (Details) Sheet http://www.wdc.com/role/DisaggregatedRevenueGeographicInformationConcentrationsofRiskandSegmentReportingScheduleofSegmentReportingDetails Disaggregated Revenue, Geographic Information, Concentrations of Risk, and Segment Reporting - Schedule of Segment Reporting (Details) Details 45 false false R46.htm 9955530 - Disclosure - Discontinued Operations - Additional Information (Details) Sheet http://www.wdc.com/role/DiscontinuedOperationsAdditionalInformationDetails Discontinued Operations - Additional Information (Details) Details 46 false false R47.htm 9955531 - Disclosure - Discontinued Operations - Net Income (Loss) from Discontinued Operations, Net of Taxes (Details) Sheet http://www.wdc.com/role/DiscontinuedOperationsNetIncomeLossfromDiscontinuedOperationsNetofTaxesDetails Discontinued Operations - Net Income (Loss) from Discontinued Operations, Net of Taxes (Details) Details 47 false false R48.htm 9955532 - Disclosure - Discontinued Operations - Selected Cash Flow Information from Discontinued Operations (Details) Sheet http://www.wdc.com/role/DiscontinuedOperationsSelectedCashFlowInformationfromDiscontinuedOperationsDetails Discontinued Operations - Selected Cash Flow Information from Discontinued Operations (Details) Details 48 false false R49.htm 9955533 - Disclosure - Supplemental Financial Statement Data - Inventory (Details) Sheet http://www.wdc.com/role/SupplementalFinancialStatementDataInventoryDetails Supplemental Financial Statement Data - Inventory (Details) Details 49 false false R50.htm 9955534 - Disclosure - Supplemental Financial Statement Data - Property, Plant and Equipment (Details) Sheet http://www.wdc.com/role/SupplementalFinancialStatementDataPropertyPlantandEquipmentDetails Supplemental Financial Statement Data - Property, Plant and Equipment (Details) Details 50 false false R51.htm 9955535 - Disclosure - Supplemental Financial Statement Data - Additional Information (Details) Sheet http://www.wdc.com/role/SupplementalFinancialStatementDataAdditionalInformationDetails Supplemental Financial Statement Data - Additional Information (Details) Details 51 false false R52.htm 9955536 - Disclosure - Supplemental Financial Statement Data - Non-current Assets (Details) Sheet http://www.wdc.com/role/SupplementalFinancialStatementDataNoncurrentAssetsDetails Supplemental Financial Statement Data - Non-current Assets (Details) Details 52 false false R53.htm 9955537 - Disclosure - Supplemental Financial Statement Data - Movement in Standard Product Warranty Accrual (Details) Sheet http://www.wdc.com/role/SupplementalFinancialStatementDataMovementinStandardProductWarrantyAccrualDetails Supplemental Financial Statement Data - Movement in Standard Product Warranty Accrual (Details) Details 53 false false R54.htm 9955538 - Disclosure - Supplemental Financial Statement Data - Total Warranty Accrual (Details) Sheet http://www.wdc.com/role/SupplementalFinancialStatementDataTotalWarrantyAccrualDetails Supplemental Financial Statement Data - Total Warranty Accrual (Details) Details 54 false false R55.htm 9955539 - Disclosure - Supplemental Financial Statement Data - Other Liabilities (Details) Sheet http://www.wdc.com/role/SupplementalFinancialStatementDataOtherLiabilitiesDetails Supplemental Financial Statement Data - Other Liabilities (Details) Details 55 false false R56.htm 9955540 - Disclosure - Supplemental Financial Statement Data - Accumulated Other Comprehensive Loss Roll Forward (Details) Sheet http://www.wdc.com/role/SupplementalFinancialStatementDataAccumulatedOtherComprehensiveLossRollForwardDetails Supplemental Financial Statement Data - Accumulated Other Comprehensive Loss Roll Forward (Details) Details 56 false false R57.htm 9955541 - Disclosure - Fair Value Measurements and Investments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Sheet http://www.wdc.com/role/FairValueMeasurementsandInvestmentsFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetail Fair Value Measurements and Investments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Details 57 false false R58.htm 9955542 - Disclosure - Fair Value Measurements and Investments - Additional Information (Details) Sheet http://www.wdc.com/role/FairValueMeasurementsandInvestmentsAdditionalInformationDetails Fair Value Measurements and Investments - Additional Information (Details) Details 58 false false R59.htm 9955543 - Disclosure - Fair Value Measurements and Investments - Debt Instrument Fair Value (Details) Sheet http://www.wdc.com/role/FairValueMeasurementsandInvestmentsDebtInstrumentFairValueDetails Fair Value Measurements and Investments - Debt Instrument Fair Value (Details) Details 59 false false R60.htm 9955544 - Disclosure - Debt - Schedule of Debt (Details) Sheet http://www.wdc.com/role/DebtScheduleofDebtDetails Debt - Schedule of Debt (Details) Details 60 false false R61.htm 9955545 - Disclosure - Debt - Additional Information (Details) Sheet http://www.wdc.com/role/DebtAdditionalInformationDetails Debt - Additional Information (Details) Details 61 false false R62.htm 9955546 - Disclosure - Pension and Other Post-Retirement Benefit Plans - Additional Information (Details) Sheet http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansAdditionalInformationDetails Pension and Other Post-Retirement Benefit Plans - Additional Information (Details) Details 62 false false R63.htm 9955547 - Disclosure - Pension and Other Post-Retirement Benefit Plans - Obligations and Funded Status (Details) Sheet http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansObligationsandFundedStatusDetails Pension and Other Post-Retirement Benefit Plans - Obligations and Funded Status (Details) Details 63 false false R64.htm 9955548 - Disclosure - Pension and Other Post-Retirement Benefit Plans - Unfunded Amounts Recognized on Consolidated Balance Sheets (Details) Sheet http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansUnfundedAmountsRecognizedonConsolidatedBalanceSheetsDetails Pension and Other Post-Retirement Benefit Plans - Unfunded Amounts Recognized on Consolidated Balance Sheets (Details) Details 64 false false R65.htm 9955549 - Disclosure - Pension and Other Post-Retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Obligations (Details) Sheet http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansWeightedAverageActuarialAssumptionsusedtoDetermineBenefitObligationsDetails Pension and Other Post-Retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Obligations (Details) Details 65 false false R66.htm 9955550 - Disclosure - Pension and Other Post-Retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Costs (Details) Sheet http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansWeightedAverageActuarialAssumptionsusedtoDetermineBenefitCostsDetails Pension and Other Post-Retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Costs (Details) Details 66 false false R67.htm 9955551 - Disclosure - Pension and Other Post-Retirement Benefit Plans - Defined Benefit Pension Plans' Major Asset Categories and Their Associated Fair Values (Details) Sheet http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansDefinedBenefitPensionPlansMajorAssetCategoriesandTheirAssociatedFairValuesDetails Pension and Other Post-Retirement Benefit Plans - Defined Benefit Pension Plans' Major Asset Categories and Their Associated Fair Values (Details) Details 67 false false R68.htm 9955552 - Disclosure - Leases and Other Commitments - Supplemental Balance Sheet (Details) Sheet http://www.wdc.com/role/LeasesandOtherCommitmentsSupplementalBalanceSheetDetails Leases and Other Commitments - Supplemental Balance Sheet (Details) Details 68 false false R69.htm 9955553 - Disclosure - Leases and Other Commitments - Supplemental Cash Flow (Details) Sheet http://www.wdc.com/role/LeasesandOtherCommitmentsSupplementalCashFlowDetails Leases and Other Commitments - Supplemental Cash Flow (Details) Details 69 false false R70.htm 9955554 - Disclosure - Leases and Other Commitments - Minimum Lease Payments (Details) Sheet http://www.wdc.com/role/LeasesandOtherCommitmentsMinimumLeasePaymentsDetails Leases and Other Commitments - Minimum Lease Payments (Details) Details 70 false false R71.htm 9955555 - Disclosure - Leases and Other Commitments - Long-Term Commitments (Details) Sheet http://www.wdc.com/role/LeasesandOtherCommitmentsLongTermCommitmentsDetails Leases and Other Commitments - Long-Term Commitments (Details) Details 71 false false R72.htm 9955556 - Disclosure - Shareholders’ Equity and Convertible Preferred Stock - Additional Information (Details) Sheet http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockAdditionalInformationDetails Shareholders’ Equity and Convertible Preferred Stock - Additional Information (Details) Details 72 false false R73.htm 9955557 - Disclosure - Shareholders’ Equity and Convertible Preferred Stock - Stock-Based Compensation Expense (Details) Sheet http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockStockBasedCompensationExpenseDetails Shareholders’ Equity and Convertible Preferred Stock - Stock-Based Compensation Expense (Details) Details 73 false false R74.htm 9955558 - Disclosure - Shareholders’ Equity and Convertible Preferred Stock - Unrecognized Share-based Compensation (Details) Sheet http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockUnrecognizedSharebasedCompensationDetails Shareholders’ Equity and Convertible Preferred Stock - Unrecognized Share-based Compensation (Details) Details 74 false false R75.htm 9955559 - Disclosure - Shareholders’ Equity and Convertible Preferred Stock - Restricted Stock Units And Performance Share Units (Details) Sheet http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockRestrictedStockUnitsAndPerformanceShareUnitsDetails Shareholders’ Equity and Convertible Preferred Stock - Restricted Stock Units And Performance Share Units (Details) Details 75 false false R76.htm 9955560 - Disclosure - Shareholders’ Equity and Convertible Preferred Stock - Fair Values Assumptions User For Employee Stock Purchase Plan Granted (Details) Sheet http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockFairValuesAssumptionsUserForEmployeeStockPurchasePlanGrantedDetails Shareholders’ Equity and Convertible Preferred Stock - Fair Values Assumptions User For Employee Stock Purchase Plan Granted (Details) Details 76 false false R77.htm 9955561 - Disclosure - Shareholders’ Equity and Convertible Preferred Stock - Common Stock, Convertible Preferred Stock, Share Repurchase Program and Dividends (Details) Sheet http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockCommonStockConvertiblePreferredStockShareRepurchaseProgramandDividendsDetails Shareholders’ Equity and Convertible Preferred Stock - Common Stock, Convertible Preferred Stock, Share Repurchase Program and Dividends (Details) Details 77 false false R78.htm 9955562 - Disclosure - Shareholders’ Equity and Convertible Preferred Stock - Stock Reserved for Issuance (Details) Sheet http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockStockReservedforIssuanceDetails Shareholders’ Equity and Convertible Preferred Stock - Stock Reserved for Issuance (Details) Details 78 false false R79.htm 9955563 - Disclosure - Income Taxes - Domestic and Foreign Components of Income Before Income Taxes (Details) Sheet http://www.wdc.com/role/IncomeTaxesDomesticandForeignComponentsofIncomeBeforeIncomeTaxesDetails Income Taxes - Domestic and Foreign Components of Income Before Income Taxes (Details) Details 79 false false R80.htm 9955564 - Disclosure - Income Taxes - Components of Provision for Income Taxes (Details) Sheet http://www.wdc.com/role/IncomeTaxesComponentsofProvisionforIncomeTaxesDetails Income Taxes - Components of Provision for Income Taxes (Details) Details 80 false false R81.htm 9955565 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details) Sheet http://www.wdc.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails Income Taxes - Deferred Tax Assets and Liabilities (Details) Details 81 false false R82.htm 9955566 - Disclosure - Income Taxes - Additional Information (Details) Sheet http://www.wdc.com/role/IncomeTaxesAdditionalInformationDetails Income Taxes - Additional Information (Details) Details 82 false false R83.htm 9955567 - Disclosure - Income Taxes - Reconciles the Income Tax Provision for Current Year (Details) Sheet http://www.wdc.com/role/IncomeTaxesReconcilestheIncomeTaxProvisionforCurrentYearDetails Income Taxes - Reconciles the Income Tax Provision for Current Year (Details) Details 83 false false R84.htm 9955568 - Disclosure - Income Taxes - Schedule of Cash Paid for Income Taxes (Details) Sheet http://www.wdc.com/role/IncomeTaxesScheduleofCashPaidforIncomeTaxesDetails Income Taxes - Schedule of Cash Paid for Income Taxes (Details) Details 84 false false R85.htm 9955569 - Disclosure - Income Taxes - Reconciliation of the U.S. Federal Statutory Rate for Prior Year (Details) Sheet http://www.wdc.com/role/IncomeTaxesReconciliationoftheUSFederalStatutoryRateforPriorYearDetails Income Taxes - Reconciliation of the U.S. Federal Statutory Rate for Prior Year (Details) Details 85 false false R86.htm 9955570 - Disclosure - Income Taxes - NOL Carryforward (Details) Sheet http://www.wdc.com/role/IncomeTaxesNOLCarryforwardDetails Income Taxes - NOL Carryforward (Details) Details 86 false false R87.htm 9955571 - Disclosure - Income Taxes - Unrecognized Tax Benefits (Details) Sheet http://www.wdc.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails Income Taxes - Unrecognized Tax Benefits (Details) Details 87 false false R88.htm 9955572 - Disclosure - Business Realignment Charges (Credits) - Expense Recognition (Details) Sheet http://www.wdc.com/role/BusinessRealignmentChargesCreditsExpenseRecognitionDetails Business Realignment Charges (Credits) - Expense Recognition (Details) Details http://www.wdc.com/role/BusinessRealignmentChargesCreditsTables 88 false false R89.htm 9955573 - Disclosure - Business Realignment Charges (Credits) - Business Realignment Activities (Details) Sheet http://www.wdc.com/role/BusinessRealignmentChargesCreditsBusinessRealignmentActivitiesDetails Business Realignment Charges (Credits) - Business Realignment Activities (Details) Details http://www.wdc.com/role/BusinessRealignmentChargesCreditsTables 89 false false R90.htm 9955574 - Disclosure - Net Income (Loss) Per Common Share (Details) Sheet http://www.wdc.com/role/NetIncomeLossPerCommonShareDetails Net Income (Loss) Per Common Share (Details) Details http://www.wdc.com/role/NetIncomeLossPerCommonShareTables 90 false false R91.htm 9955575 - Disclosure - Legal Proceedings (Details) Sheet http://www.wdc.com/role/LegalProceedingsDetails Legal Proceedings (Details) Details http://www.wdc.com/role/LegalProceedings 91 false false R92.htm 9955576 - Disclosure - Western Digital Corporation 401(k) Plan (Details) Sheet http://www.wdc.com/role/WesternDigitalCorporation401kPlanDetails Western Digital Corporation 401(k) Plan (Details) Details http://www.wdc.com/role/WesternDigitalCorporation401kPlan 92 false false R93.htm 9955577 - Disclosure - Supplier Finance Program - Additional Information (Details) Sheet http://www.wdc.com/role/SupplierFinanceProgramAdditionalInformationDetails Supplier Finance Program - Additional Information (Details) Details 93 false false R94.htm 9955578 - Disclosure - Supplier Finance Program - Roll-Forward of Outstanding Obligations Under Supplier Finance Program (Details) Sheet http://www.wdc.com/role/SupplierFinanceProgramRollForwardofOutstandingObligationsUnderSupplierFinanceProgramDetails Supplier Finance Program - Roll-Forward of Outstanding Obligations Under Supplier Finance Program (Details) Details 94 false false All Reports Book All Reports wdc-20260703.htm wdc-20260703.xsd wdc-20260703_cal.xml wdc-20260703_def.xml wdc-20260703_lab.xml wdc-20260703_pre.xml wdc-20260703_g1.jpg wdc-20260703_g2.jpg http://fasb.org/srt/2026 http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/cyd/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ecd/2026 true true