| Document and Entity Information | Oct. 06, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001768267 |
| Document Type | 8-K |
| Document Period End Date | Oct. 06, 2024 |
| Entity Registrant Name | CERENCE INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39030 |
| Entity Tax Identification Number | 83-4177087 |
| Entity Address, Address Line One | 25 Mall Road |
| Entity Address, Address Line Two | Suite 416 |
| Entity Address, City or Town | Burlington |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01803 |
| City Area Code | (857) |
| Local Phone Number | 362-7300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, $0.01 par value |
| Trading Symbol | CRNC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
