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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Jun. 29, 2024
Aug. 16, 2024
Dec. 29, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 29, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Registrant Name SYNAPTICS INCORPORATED    
Trading Symbol SYNA    
Entity Central Index Key 0000817720    
Current Fiscal Year End Date --06-26    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
ICFR Auditor Attestation Flag true    
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 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    
Entity Common Stock, Shares Outstanding   39,582,719  
Entity Public Float     $ 3,315,423,762
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 Financial Statement Error Correction [Flag] true    
Document Financial Statement Restatement Recovery Analysis [Flag] false    
Document Annual Report true    
Document Transition Report false    
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 2024 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. 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 of this Form 10-K.

    
Auditor Name KPMG LLP    
Auditor Location Santa Clara, California    
Auditor Firm ID 185