| Cover | Jan. 28, 2025 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 28, 2025 |
| Registrant Name | SYNAPTICS INCORPORATED |
| Entity Incorporation, State or Country Code | DE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | SYNA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Central Index Key | 0000817720 |
