v2.4.0.6
Document and Company Information (USD $)
In Billions, except Share data, unless otherwise specified
3 Months Ended
Oct. 02, 2009
Oct. 22, 2009
Dec. 26, 2008
Document and Company Information [Abstract]      
Entity Registrant Name WESTERN DIGITAL CORP    
Entity Central Index Key 0000106040    
Document Type 10-Q    
Document Period End Date Oct. 02, 2009    
Amendment Flag false    
Current Fiscal Year End Date --07-03    
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)   225,383,848