Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
Dec. 28, 2012
Minimum [Member]
Subsequent Event [Line Items]
Amount of tax benefit to be recognized	$ 30
Maximum [Member]
Subsequent Event [Line Items]
Amount of tax benefit to be recognized	$ 40

Expected Tax Benefit Resulting From Retroactive Extension Of Research And Development Credit

No definition available.

Name:	wdc_ExpectedTaxBenefitResultingFromRetroactiveExtensionOfResearchAndDevelopmentCredit
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration