| Document and Entity Information | Nov. 12, 2019 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001384905 |
| Document Type | 8-K |
| Document Period End Date | Nov. 12, 2019 |
| Entity Registrant Name | RINGCENTRAL, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36089 |
| Entity Tax Identification Number | 94-3322844 |
| Entity Address, Address Line One | 20 Davis Drive |
| Entity Address, City or Town | Belmont |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94043 |
| City Area Code | (650) |
| Local Phone Number | 472-4100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, par value $0.0001 |
| Trading Symbol | RNG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
