2.4.0.8166 - Disclosure - Income Taxes - U.S. Federal Statutory Rate to Company's Effective Tax Rate (Detail)truefalsefalse1false falsefalseeol_PE10781---1310-K0007_STD_364_20130628_0http://www.sec.gov/CIK0000106040duration2012-06-30T00:00:002013-06-28T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure02false falsefalseeol_PE10781---1310-K0007_STD_364_20120629_0http://www.sec.gov/CIK0000106040duration2011-07-02T00:00:002012-06-29T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure03false falsefalseeol_PE10781---1310-K0007_STD_364_20110701_0http://www.sec.gov/CIK0000106040duration2010-07-03T00:00:002011-07-01T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure01true 1us-gaap_IncomeTaxDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Income Tax Disclosure [Abstract]2false 2us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRateus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.350.35falsefalsefalse2truetruefalse0.350.35falsefalsefalse3truetruefalse0.350.35falsefalsefalsenum:percentItemTypepurePercentage of domestic federal statutory tax rate applicable to pretax income (loss).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 false0U.S. Federal statutory rate3false 2us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferentialus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.19-0.19falsefalsefalse2truetruefalse-0.29-0.29falsefalsefalse3truetruefalse-0.26-0.26falsefalsefalsenum:percentItemTypepurePercentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 false0Tax rate differential on international income4false 2wdc_EffectiveIncomeTaxRateReconciliationNonDeductibleExpenseswdc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsetruefalse00falsefalsefalse2truetruefalse0.030.03falsefalsefalse3truetruefalse0.030.03falsefalsefalsenum:percentItemTypepureThe portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to differences in the deductibility or non-deductibility of items such as stock options and other equity-based compensation costs and foreign income not eligible for deferral in accordance with generally accepted accounting principles and enacted tax laws.No definition available.false0Tax effect of U.S. permanent differences5false 2us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.080.08falsefalsefalse2truetruefalse0.010.01falsefalsefalse3truetruefalse-0.01-0.01falsefalsefalsenum:percentItemTypepurePercentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 false0State income tax, net of federal tax6false 2us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse-0.04-0.04falsefalsefalse2truetruefalse-0.02-0.02falsefalsefalse3truetruefalse-0.04-0.04falsefalsefalsenum:percentItemTypepurePercentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 false0Income tax credits7false 2us-gaap_EffectiveIncomeTaxRateContinuingOperationsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truetruefalse0.200.20falsefalsefalse2truetruefalse0.080.08falsefalsefalse3truetruefalse0.070.07falsefalsefalsenum:percentItemTypepurePercentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 true0Effective tax ratefalseIncome Taxes - U.S. Federal Statutory Rate to Company's Effective Tax Rate (Detail)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.westerndigital.com/taxonomy/role/DisclosureIncomeTaxesUSFederalStatutoryRateToCompanysEffectiveTaxRate37