Depreciation and amortization Stock-based compensation Inventory, Net Total inventories Inventories Total current assets Property, plant and equipment, net Property and equipment, net Accounts receivable Accounts receivable, net Accounts receivable, net Total assets Increase (Decrease) in Inventories Inventories Inventories Inventories Accounts payable Accrued expenses Total current liabilities Total liabilities Additional paid-in capital Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained earnings Retained earnings Stockholders' Equity Attributable to Parent Ending balance Beginning balance Total shareholders' equity Total liabilities and shareholders' equity Net cash provided by operating activities Net cash used in investing activities Total operating expenses Operating income Interest income Earnings Per Share, Basic Basic Earnings Per Share, Basic, Total Basic income per common share Earnings Per Share, Diluted Diluted Earnings Per Share, Diluted, Total Diluted income per common share Weighted average shares outstanding: Basic Basic Basic Income Tax Expense (Benefit) Income tax provision Income tax provision Issuance of common stock under employee plans Repurchases of common stock Net increase in cash and cash equivalents Repayment of debt Cash paid for income taxes Cash paid for interest Accrued warranty The carrying value as of the balance sheet date for estimated warranty costs Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares outstanding Common stock, par value Common stock, shares authorized Research and development LIABILITIES AND SHAREHOLDERS' EQUITY Shareholders' equity: Current liabilities: Accrued warranty Accrued warranty ASSETS Current assets: Cash flows from financing activities Cash flows from investing activities Cash flows from operating activities Changes in: Other income (expense): Operating expenses: Income per Common Share [Abstract] Income per common share: Interest and other expense Interest and other expense Expense for borrowed money and other non-operating activities. Entity Common Stock, Shares Outstanding (actual number) Supplemental disclosure of cash flow information: Interest and other expense Accounts payable Accounts Payable, Current, Total Accounts Payable, Current Accrued expenses Accrued Liabilities, Current, Total Accrued Liabilities, Current Repurchases of common stock Repayment of debt Repayments of Long-term Debt Total current assets Assets, Current Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net Total current liabilities Liabilities, Current Total liabilities Liabilities Additional paid-in capital Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Ending Balance Additional Paid in Capital Operating income Operating Income (Loss) Stock-based compensation Share-based Compensation Accrued expenses Increase (Decrease) in Accrued Liabilities Repayment of debt Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Adjustments to reconcile net income to net cash provided by operations: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document and Entity Information. Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average shares outstanding: ASSETS Current assets: LIABILITIES AND SHAREHOLDERS' EQUITY Current liabilities: Shareholders' equity: Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares outstanding Preferred Stock, Shares Outstanding, Beginning Balance Preferred Stock, Shares Outstanding, Ending Balance Common stock, par value Common stock, shares authorized Operating expenses: Research and development Other income (expense): Interest income Cash flows from operating activities Changes in: Accounts payable Cash flows from investing activities Cash flows from financing activities Issuance of stock under employee stock plans Supplemental disclosure of cash flow information: Cash paid for income taxes Cash paid for interest Preferred Stock Values Preferred stock, $.01 par value; authorized - 5 shares; issued and outstanding - none Preferred stock, $.01 par value; authorized - 5 shares; outstanding - None Dollar value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) whether issued at par value, no par or stated value. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. Common Stock Values Common stock, $.01 par value; authorized - 450 shares; issued and outstanding - 233 and 231 shares, respectively Common stock, $.01 par value; authorized - 450 shares; outstanding - 225 shares Dollar value of issued common stock whether issued at par value, no par or stated value. Note: elements for number of common shares, par value and other disclosure concepts are in another section within stockholders' equity. Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Assets Liabilities and Stockholders' Equity Operating Expenses Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Investing Activities Taxes paid on vested stock awards under employee stock plans Taxes paid on vested stock awards under employee stock plans Taxes paid on vested stock awards under employee stock plans. Document Fiscal Year Focus Document Fiscal Period Focus Inventory, Work in Process Work-in-process Computation Of Basic And Diluted Income Per Common Share Abstract Computation of basic and diluted income per common share. Computation of basic and diluted income per common share Debt (Textuals) [Abstract] Debt. Debt (Textuals) [Abstract] Debt Instrument, Maturity Date Maturity date of term loan Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options outstanding, Ending Balance, Numbers of Shares Options outstanding, Beginning Balance, Numbers of Shares Beginning Balance, Numbers of Shares Option Outstanding Numbers of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options outstanding, Ending Balance, Weighted Average Exercise Price Options outstanding, Beginning Balance, Weighted Average Exercise Price Beginning Balance, Weighted Average Grant Date Fair Value Per Share Option Outstanding Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options Outstanding, Ending Balance, Aggregate Intrinsic Value Options Outstanding, Ending Balance, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Fair value of stock options granted Long-term Debt, Maturities, Repayments of Principal in Year Two Total principle amount payable, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Aggregate intrinsic value of options exercised under the Company's stock option plan Inventory, Raw Materials Inventory, Raw Materials, Total Raw materials and component parts Period of term loan facility Period of term loan facility Period of Term loan facility. Term Loan [Member] Term Loan Member. Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total Canceled or expired, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted stock, Number of share granted Restricted stock, granted Restricted Stock Expense Expense related to the vesting of restricted stock unit awards Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Debt Instrument [Line Items] Schedule of Long-term Debt Instruments [Table] Income Taxes (Textuals) [Abstract] Income Taxes (Textuals) [Abstract] Income Taxes Textuals Abstract. Unrecognized Tax Benefits Unrecognized tax benefit at July 1, 2011 Unrecognized tax benefit at July 2, 2010 Unrecognized tax benefits Fair Value Measurements Textuals Abstract Fair Value Measurements (Textuals) [Abstract] Fair Value Measurements. Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] Fair Value, assets and liabilities measured on recurring basis Maturity of auction rate securities Maturity of auction rate securities Maturity of auction rate securities. Debt Instrument, Interest Rate at Period End Variable interest rate of term loan Stock Based Compensation Expense Expenses on stock-based compensation The noncash expense that accounts for the value of stock options distributed to employees as compensation and of employee stock purchase plan rights. Unvested Employee Service Share Based Compensation Stock Option Awards And Employee Stock Purchase Plan Rights Issued But Not Yet Recognized Total compensation cost related to unvested stock options and ESPP rights issued As of the balance sheet date, the aggregate unrecognized cost of stock option awards made to employees under share-based compensation plans and employee stock purchase plan rights that have yet to vest. Other Current Assets [Member] Other Current Assets Member. Cost of revenue [Member] Cost of revenue Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Text Block] Fair value and balance sheet location Foreign Exchange Contracts (Textuals) [Abstract] Foreign Exchange Contracts (Textuals) [Abstract] Foreign Exchange Contracts. Derivative Instruments, Gain (Loss) by Income Statement Location [Axis] Income Statement and Other Comprehensive Income Location [Domain] Derivative Instruments, Gain Recognized in Other Comprehensive Income, Effective Portion Amount of Gain (Loss) Recognized in accumulated OCI on Derivatives Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total Amount of Gain (Loss) Reclassified from accumulated OCI into Income Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months Gains expected to be reclassified into earnings Foreign Exchange Contracts Opened During Period Foreign exchange contracts opened during the period by company Total dollar amount of foreign exchange contracts opened during the period. Foreign Exchange Contracts Closed During Period Foreign exchange contracts closed during the period by company Total dollar amount of foreign exchange contracts closed during the period. Derivative Contract Type [Domain] Derivatives, Fair Value, by Balance Sheet Location [Axis] Balance Sheet Location [Domain] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivatives, Fair Value [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Share Based Compensation Options Granted Weighted Average Exercise Price Granted, Weighted Average Grant Date Fair Value Per Share Granted, Weighted Average Exercise Price Per Share The weighted average exercise price of options granted as share based compensation. Share Based Compensation, Options, Exercises in Period, Weighted Average Exercise Price Exercised, Weighted Average Grant Date Fair Value Per Share Exercised, Weighted Average Exercise Price Per Share The weighted average price at which option holders acquired shares when converting their stock options into shares. Share Based Compensation, Options Outstanding, Remaining Contractual Life Remaining Contractual Life (in years) Options Outstanding, Ending Balance, Weighted Average Remaining Contractual Life (in years) The weighted average remaining contractual life of options outstanding at the end of the period expressed in years. Share Based Compensation, Options Exercisable, Remaining Contractual Life Exercisable at July 1, 2011, Remaining Contractual Life (in years) Exercisable at July 1, 2011, Weighted Average Remaining Contractual Life The weighted average remaining contractual life of options exercisable at the end of the period expressed in years. Share Based Compensation, Options Exercisable, Intrinsic Value Exercisable at July 1, 2011, Aggregate Intrinsic Value Exercisable at July 1, 2011, Aggregate Intrinsic Value The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and exercisable as of the end of the period. Share Based Compensation, Fair Value Assumptions, Suboptimal Exercise Factor Suboptimal exercise factor Factor to estimate the amount of option exercises prior to the end of their respective term. Derivative Instruments and Hedging Activities Disclosure [Text Block] Foreign Exchange Contracts Common Stock, Shares, Issued Common Stock, Shares, Issued, Total Common stock, shares issued Preferred Stock, Shares Issued Preferred Stock, Shares Issued, Total Preferred stock, shares issued Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Payments to Acquire Property, Plant, and Equipment Purchases of property, plant and equipment Purchases of property, plant and equipment Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit), Total Deferred income taxes Debt Additional Textuals Abstract Debt (Additional) (Textuals) [Abstract] Debt. Share Based Compensation Arrangement By Share Based Payments Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term Vested and expected to vest after July 1, 2011, Weighted Average Remaining Contractual Life (in years) Share based payments award options vested and expected to vest outstanding weighted average Remaining Contractual Term. Estimated Impact Of Proposed I R S Adjustments On Pretax Income Estimated impact of proposed IRS adjustments on pre-tax income Estimated impact of proposed IRS adjustments on pre-tax income. Business Acquisition, Cost of Acquired Entity, Purchase Price Business Acquisition, Cost of Acquired Entity, Purchase Price, Total Purchase price of planned acquisition Komag [Member] Komag [Member] Komag Member. Legal Entity [Axis] Parent Company [Member] Western Digital Corporation [Member] Income Tax Examination [Table] Income Tax Examination [Line Items] Fees To Be Paid To Other Party If Acquisition Does Not Close By A Specific Date Fees to be paid to other party if acquisition does not close by a specified date Fees to be paid to other party if acquisition does not close by a specified date Fees to be paid to other party if acquisition does not close by a date specified in purchase agreement. Revolving Credit Facility Related To Acquisition Maximum Borrowing Capacity Total Senior Revolving Facility, Related to Acquisition Total Senior Revolving Facility, Related to Acquisition Maximum borrowing capacity under the revolving credit facility related to the acquisition without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Term Loan Facility Related To Acquisition Maximum Borrowing Capacity Total Senior Term Loan Facility, Related to Acquisition Total Senior Term Loan Facility, Related to Acquisition Maximum borrowing capacity under the term loan facility related to the acquisition without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.