v3.25.2
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Jun. 27, 2025
Jul. 23, 2025
Dec. 27, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 27, 2025    
Current Fiscal Year End Date --06-27    
Document Transition Report false    
Entity File Number 1-8703    
Entity Registrant Name WESTERN DIGITAL CORPORATION    
Entity Incorporation, State or Country Code DE    
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    
Title of 12(b) Security Common Stock, $0.01 Par Value Per Share    
Trading Symbol WDC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 12,240
Entity Common Stock, Shares Outstanding (in shares)   346,922,126  
Documents Incorporated by Reference
Part III incorporates by reference certain information from the registrant’s definitive proxy statement (the “Proxy Statement”) for the 2025 Annual Meeting of Stockholders, which we intend to file with the Securities and Exchange Commission within 120 days after the end of the 2025 fiscal year. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part hereof.
    
Entity Central Index Key 0000106040    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false