2.4.0.8159 - Disclosure - Shareholders' Equity - Fair Value of Stock Options Granted (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_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0USDUSD$2false USDfalsefalse$eol_PE10781---1310-K0007_STD_364_20120629_0http://www.sec.gov/CIK0000106040duration2011-07-02T00:00:002012-06-29T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure0iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0USDUSD$3false USDfalsefalse$eol_PE10781---1310-K0007_STD_364_20110701_0http://www.sec.gov/CIK0000106040duration2010-07-03T00:00:002011-07-01T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure0iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0USDUSD$1true 1us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]2false 2wdc_ShareBasedCompensationFairValueAssumptionsSuboptimalExerciseFactorwdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1.901.90falsefalsefalse2truefalsefalse1.811.81falsefalsefalse3truefalsefalse1.811.81falsefalsefalsexbrli:pureItemTypepureFactor to estimate the amount of option exercises prior to the end of their respective term.No definition available.false0Suboptimal exercise factor3false 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimumus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.00140.0014falsefalsefalse2truetruefalse0.00120.0012falsefalsefalse3truetruefalse0.00200.0020falsefalsefalsenum:percentItemTypepureThe minimum risk-free interest rate assumption that is used in valuing an option on its own shares.No definition available.false0Risk-free interest rates, minimum4false 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximumus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.01960.0196falsefalsefalse2truetruefalse0.01610.0161falsefalsefalse3truetruefalse0.02900.0290falsefalsefalsenum:percentItemTypepureThe maximum risk-free interest rate assumption that is used in valuing an option on its own shares.No definition available.false0Risk-free interest rates, maximum5false 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimumus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.00360.0036falsefalsefalse2truetruefalse0.00410.0041falsefalsefalse3truetruefalse0.00390.0039falsefalsefalsenum:percentItemTypepureThe estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.No definition available.false0Expected stock price volatility, minimum6false 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximumus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.00530.0053falsefalsefalse2truetruefalse0.00550.0055falsefalsefalse3truetruefalse0.00590.0059falsefalsefalsenum:percentItemTypepureThe estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.No definition available.false0Expected stock price volatility, maximum7false 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRateus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.00490.0049falsefalsefalse2truetruefalse0.00490.0049falsefalsefalse3truetruefalse0.00520.0052falsefalsefalsenum:percentItemTypepureWeighted average expected volatility rate of share-based compensation awards.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Weighted average expected volatility8false 2wdc_ShareBasedCompensationFairValueAssumptionsPostVestingTerminationRatewdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.02160.0216falsefalsefalse2truetruefalse0.02610.0261falsefalsefalse3truetruefalse0.02440.0244falsefalsefalsenum:percentItemTypepureFactor to estimate the amount of vested options that will be exercised within 90 days as a result of employee termination.No definition available.false0Post-vesting termination rate9false 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.02530.0253falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00  falsefalsefalsenum:percentItemTypepureThe estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Dividend yield10false 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse15.7515.75USD$falsetruefalse2truefalsefalse12.9112.91USD$falsetruefalse3truefalsefalse11.4211.42USD$falsetruefalsenum:perShareItemTypedecimalThe weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Fair valuefalseShareholders' Equity - Fair Value of Stock Options Granted (Detail) (USD $)UnKnownUnKnownNoRoundingUnKnowntruefalsefalseSheethttp://www.westerndigital.com/taxonomy/role/DisclosureShareholdersEquityFairValueOfStockOptionsGranted310