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Cover Page - USD ($)
 12 Months Ended
Sep. 27, 2019
Nov. 15, 2019
Mar. 29, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 27, 2019    
Document Transition Report false    
Entity File Number 1-7598    
Entity Registrant Name VARIAN MEDICAL SYSTEMS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-2359345    
Entity Address, Address Line One 3100 Hansen Way    
Entity Address, City or Town Palo Alto    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94304-1038    
City Area Code (650)    
Local Phone Number 493-4000    
Title of 12(b) Security Common Stock, $1 par value    
Trading Symbol VAR    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Amendment Flag false    
Document Fiscal Year Focus 2019    
FY FY    
Entity Central Index Key 0000203527    
Current Fiscal Year End Date --09-27    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   90,897,556  
Entity Public Float     $ 11,483,697,873
Documents Incorporated by Reference
Definitive Proxy Statement for the Company’s 2020 Annual Meeting of Stockholders — Part III of this Form 10-K