Document and Entity Information
9 Months Ended
Mar. 30, 2012
May 04, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name WESTERN DIGITAL CORP  
Entity Central Index Key 0000106040  
Document Type 10-Q  
Document Period End Date Mar. 30, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --06-29  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding (actual number)   260,026,442