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Document and Entity Information - USD ($)
 12 Months Ended
Jun. 27, 2020
Aug. 17, 2020
Dec. 27, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 27, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Registrant Name SYNAPTICS INCORPORATED    
Trading Symbol SYNA    
Entity Central Index Key 0000817720    
Current Fiscal Year End Date --06-27    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Well Known Seasoned Issuer Yes    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity File Number 000-49602    
Entity Tax Identification Number 77-0118518    
Entity Address, Address Line One 1251 McKay Drive    
Entity Address, City or Town San Jose    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95131    
City Area Code 408    
Local Phone Number 904-1100    
Entity Common Stock, Shares Outstanding   34,229,602  
Entity Public Float     $ 1,388,185,361
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, par value $.001 per share    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference Portions of the registrant's definitive Proxy Statement for the 2020 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.