| Cover | Aug. 10, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 10, 2020 |
| Entity Registrant Name | Cornerstone OnDemand, Inc. |
| Entity File Number | 001-35098 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 13-4068197 |
| Entity Address, Address Line One | 1601 Cloverfield Blvd. |
| Entity Address, Address Line Two | Suite 620 South |
| Entity Address, City or Town | Santa Monica |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90404 |
| City Area Code | 310 |
| Local Phone Number | 752-0200 |
| 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 $0.0001 per share |
| Trading Symbol | CSOD |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001401680 |
