v2.4.0.6
Document and Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
9 Months Ended
Apr. 02, 2010
Apr. 23, 2010
Dec. 26, 2008
Document and Entity Information [Abstract]      
Entity Registrant Name WESTERN DIGITAL CORP    
Entity Central Index Key 0000106040    
Document Type 10-Q    
Document Period End Date Apr. 02, 2010    
Amendment Flag false    
Document Fiscal Year Focus 2010    
Document Fiscal Period Focus Q3    
Current Fiscal Year End Date --07-02    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 2.5
Entity Common Stock, Shares Outstanding (actual number)   229,174,706