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Document and Entity Information - USD ($)
 12 Months Ended
Jun. 29, 2019
Aug. 19, 2019
Dec. 28, 2018
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 29, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name SYNAPTICS Inc    
Trading Symbol SYNA    
Entity Central Index Key 0000817720    
Current Fiscal Year End Date --06-29    
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 770118518    
Entity Address, Address Line One 1251 McKay Drive    
Entity Address, City or Town San Jose    
Entity Address, State or Province California    
Entity Address, Postal Zip Code 95131    
City Area Code 408    
Local Phone Number 904-1100    
Entity Common Stock, Shares Outstanding   32,910,891  
Entity Public Float     $ 823,690,994