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Document and Entity Information
Apr. 02, 2020
Cover [Abstract]  
Entity Registrant Name SYNAPTICS Inc
Entity Incorporation State Country Code DE
Amendment Flag false
Entity Central Index Key 0000817720
Document Type 8-K
Document Period End Date Apr. 02, 2020
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $.001 per share
Trading Symbol SYNA
Security Exchange Name NASDAQ
Entity Emerging Growth Company false