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Document and Entity Information - USD ($)
 12 Months Ended
Jun. 28, 2025
Aug. 12, 2025
Dec. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 28, 2025    
Current Fiscal Year End Date --06-28    
Document Transition Report false    
Entity File Number 000-49602    
Entity Registrant Name SYNAPTICS INCORPORATED    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 77-0118518    
Entity Address, Address Line One 1109 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    
Title of 12(b) Security Common Stock, par value $.001 per share    
Trading Symbol SYNA    
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     $ 1,829,646,353
Entity Common Stock, Shares Outstanding   38,656,442  
Documents Incorporated by Reference
Portions of Part III of this Form 10-K are incorporated by reference from the registrant’s definitive proxy statement for its 2025 annual meeting of stockholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Form 10-K.
    
Entity Central Index Key 0000817720    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY