Document and Entity Information
3 Months Ended
Sep. 27, 2013
Oct. 23, 2013
Document Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 27, 2013  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q1  
Trading Symbol WDC  
Entity Registrant Name WESTERN DIGITAL CORP  
Entity Central Index Key 0000106040  
Current Fiscal Year End Date --06-27  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   236,317,992