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Organization and Basis of Presentation (Policies) link:presentationLink link:calculationLink link:definitionLink 2403401 - Disclosure - Organization and Basis of Presentation - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2104102 - Disclosure - Recent Accounting Pronouncements link:presentationLink link:calculationLink link:definitionLink 2105103 - Disclosure - Revenues link:presentationLink link:calculationLink link:definitionLink 2306301 - Disclosure - Revenues (Tables) link:presentationLink link:calculationLink link:definitionLink 2407402 - Disclosure - Revenues - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2408403 - Disclosure - Revenues - Revenue Remaining Performance Obligation (Details) link:presentationLink link:calculationLink link:definitionLink 2408403 - Disclosure - Revenues - Revenue Remaining Performance Obligation (Details) link:presentationLink link:calculationLink link:definitionLink 2109104 - Disclosure - Supplemental Financial Statement Data link:presentationLink link:calculationLink link:definitionLink 2310302 - Disclosure - Supplemental Financial Statement Data (Tables) link:presentationLink link:calculationLink link:definitionLink 2411404 - Disclosure - Supplemental Financial Statement Data - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2412405 - Disclosure - Supplemental Financial Statement Data - Inventory (Details) link:presentationLink link:calculationLink link:definitionLink 2413406 - Disclosure - Supplemental Financial Statement Data - Property, Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 2414407 - Disclosure - Supplemental Financial Statement Data - Goodwill Roll Forward (Details) link:presentationLink link:calculationLink link:definitionLink 2415408 - Disclosure - Supplemental Financial Statement Data - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2416409 - Disclosure - Supplemental Financial Statement Data - Intangible Asset Amortization (Details) link:presentationLink link:calculationLink link:definitionLink 2417410 - Disclosure - Supplemental Financial Statement Data - Intangible Asset Future Amortization (Details) link:presentationLink link:calculationLink link:definitionLink 2418411 - Disclosure - Supplemental Financial Statement Data - Movement in Standard Product Warranty Accrual (Details) link:presentationLink link:calculationLink link:definitionLink 2419412 - Disclosure - Supplemental Financial Statement Data - Total Warranty Accrual (Details) link:presentationLink link:calculationLink link:definitionLink 2420413 - Disclosure - Supplemental Financial Statement Data - Other Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2421414 - Disclosure - Supplemental Financial Statement Data - Accumulated Other Comprehensive Income (Loss) Roll Forward (Details) link:presentationLink link:calculationLink link:definitionLink 2122105 - Disclosure - Fair Value Measurements and Investments link:presentationLink link:calculationLink link:definitionLink 2323303 - Disclosure - Fair Value Measurements and Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 2424415 - Disclosure - Fair Value Measurements and Investments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) link:presentationLink link:calculationLink link:definitionLink 2425416 - Disclosure - Fair Value Measurements and Investments - Debt Instrument Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 2126106 - Disclosure - Derivatives Instruments and Hedging Activities link:presentationLink link:calculationLink link:definitionLink 2427417 - Disclosure - Derivatives Instruments and Hedging Activities - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2128107 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 2329304 - Disclosure - Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 2430418 - Disclosure - Debt - Schedule of Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2430418 - Disclosure - Debt - Schedule of Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2431419 - Disclosure - Debt - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2432420 - Disclosure - Debt - Debt Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 2133108 - Disclosure - Pensions and Other Post-retirement Benefit Plans link:presentationLink link:calculationLink link:definitionLink 2334305 - Disclosure - Pensions and Other Post-retirement Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 2435421 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Obligations and Funded Status (Details) link:presentationLink link:calculationLink link:definitionLink 2436422 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Unfunded Amounts Recognized on Consolidated Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 2437423 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2438424 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 2439425 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Weighted-Average Actuarial Assumptions used to Determine Benefit Costs (Details) link:presentationLink link:calculationLink link:definitionLink 2440426 - Disclosure - Pensions and Other Post-retirement Benefit Plans - Defined Benefit Pension Plans' Major Asset Categories and Their Associated Fair Values (Details) link:presentationLink link:calculationLink link:definitionLink 2141109 - Disclosure - Related Parties and Related Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 2342306 - Disclosure - Related Parties and Related Commitments and Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 2443427 - Disclosure - Related Parties and Related Commitments and Contingencies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2444428 - Disclosure - Related Parties and Related Commitments and Contingencies - Equity Investments (Details) link:presentationLink link:calculationLink link:definitionLink 2445429 - Disclosure - Related Parties and Related Commitments and Contingencies - Maximum Loss Exposure (Details) link:presentationLink link:calculationLink link:definitionLink 2446430 - Disclosure - Related Parties and Related Commitments and Contingencies - JV Lease Guarantees (Details) link:presentationLink link:calculationLink link:definitionLink 2447431 - Disclosure - Related Parties and Related Commitments and Contingencies - Joint Venture Lease Amounts (Details) link:presentationLink link:calculationLink link:definitionLink 2148110 - Disclosure - Leases and Other Commitments link:presentationLink link:calculationLink link:definitionLink 2349307 - Disclosure - Leases and Other Commitments (Tables) link:presentationLink link:calculationLink link:definitionLink 2450432 - Disclosure - Leases and Other Commitments - Supplemental Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 2450432 - Disclosure - Leases and Other Commitments - Supplemental Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 2451433 - Disclosure - Leases and Other Commitments - Supplemental Cash Flow (Details) link:presentationLink link:calculationLink link:definitionLink 2452434 - Disclosure - Leases and Other Commitments - Rent Expense, Net (Details) link:presentationLink link:calculationLink link:definitionLink 2453435 - Disclosure - Leases and Other Commitments - Long-Term Commitments (Details) link:presentationLink link:calculationLink link:definitionLink 2454436 - Disclosure - Leases and Other Commitments - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2155111 - Disclosure - Business Segment, Geographic Information, and Concentration of Risk link:presentationLink link:calculationLink link:definitionLink 2356308 - Disclosure - Business Segment, Geographic Information, and Concentration of Risk (Tables) link:presentationLink link:calculationLink link:definitionLink 2457437 - Disclosure - Business Segment, Geographic Information, and Concentration of Risk - Revenue by Geography (Details) link:presentationLink link:calculationLink link:definitionLink 2458438 - Disclosure - Business Segment, Geographic Information, and Concentration of Risk - Long-lived Assets by Geography (Details) link:presentationLink link:calculationLink link:definitionLink 2459439 - Disclosure - Business Segment, Geographic Information, and Concentration of Risk - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2160112 - Disclosure - Western Digital Corporation 401(k) Plan link:presentationLink link:calculationLink link:definitionLink 2461440 - Disclosure - Western Digital Corporation 401(k) Plan - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2162113 - Disclosure - Shareholders' Equity link:presentationLink link:calculationLink link:definitionLink 2363309 - Disclosure - Shareholders' Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 2464441 - Disclosure - Shareholders' Equity - 2017 Performance Incentive Plan and ESPP (Details) link:presentationLink link:calculationLink link:definitionLink 2465442 - Disclosure - Shareholders' Equity - Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2466443 - Disclosure - Shareholders' Equity - Unrecognized Share-based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 2467444 - Disclosure - Shareholders' Equity - Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2468445 - Disclosure - Shareholders' Equity - Restricted Stock Units And Performance Share Units (Details) link:presentationLink link:calculationLink link:definitionLink 2469446 - Disclosure - Shareholders' Equity - Fair Values Assumptions User For Employee Stock Purchase Plan Granted (Details) link:presentationLink link:calculationLink link:definitionLink 2470447 - Disclosure - Shareholders' Equity - Stock Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 2471448 - Disclosure - Shareholders' Equity - Stock Reserved for Issuance (Details) link:presentationLink link:calculationLink link:definitionLink 2172114 - Disclosure - Income Tax Expense link:presentationLink link:calculationLink link:definitionLink 2373310 - Disclosure - Income Tax Expense (Tables) link:presentationLink link:calculationLink link:definitionLink 2474449 - Disclosure - Income Tax Expense - Domestic and Foreign Components of Income Before Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2475450 - Disclosure - Income Tax Expense - Components of Provision for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2476451 - Disclosure - Income Tax Expense - Deferred Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2477452 - Disclosure - Income Tax Expense - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2478453 - Disclosure - Income Tax Expense - Reconciliation of the U.S. Federal statutory rate (Details) link:presentationLink link:calculationLink link:definitionLink 2479454 - Disclosure - Income Tax Expense - NOL Carryforward (Details) link:presentationLink link:calculationLink link:definitionLink 2480455 - Disclosure - Income Tax Expense - Unrecognized Tax Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 2181115 - Disclosure - Net Income (Loss) Per Common Share link:presentationLink link:calculationLink link:definitionLink 2382311 - Disclosure - Net Income (Loss) Per Common Share (Tables) link:presentationLink link:calculationLink link:definitionLink 2483456 - Disclosure - Net Income (Loss) Per Common Share - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2184116 - Disclosure - Employee Termination, Asset Impairment and Other Charges link:presentationLink link:calculationLink link:definitionLink 2385312 - Disclosure - Employee Termination, Asset Impairment and Other Charges (Tables) link:presentationLink link:calculationLink link:definitionLink 2486457 - Disclosure - Employee Termination, Asset Impairment and Other Charges - Expense Recognition (Details) link:presentationLink link:calculationLink link:definitionLink 2487458 - Disclosure - Employee Termination, Asset Impairment and Other Charges - Business Realignment Activities (Details) link:presentationLink link:calculationLink link:definitionLink 2188117 - Disclosure - Legal Proceedings link:presentationLink link:calculationLink link:definitionLink