Document and Entity Information
Jul. 06, 2021
Cover [Abstract]  
Entity Registrant Name WESTERN DIGITAL CORP
Amendment Flag false
Entity Central Index Key 0000106040
Document Type 8-K
Document Period End Date Jul. 06, 2021
Entity Incorporation State Country Code DE
Entity File Number 001-08703
Entity Tax Identification Number 33-0956711
Entity Address, Address Line One 5601 Great Oaks Parkway
Entity Address, City or Town San Jose
Entity Address, State or Province CA
Entity Address, Postal Zip Code 95119
City Area Code (408)
Local Phone Number 717-6000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $.01 Par Value Per Share
Trading Symbol WDC
Security Exchange Name NASDAQ
Entity Emerging Growth Company false