| Cover | Sep. 30, 2024 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 30, 2024 |
| Entity File Number | 811-23067 |
| Entity Registrant Name | RiverNorth Capital and Income Fund, Inc. |
| Entity Central Index Key | 0001644771 |
| Entity Incorporation, State or Country Code | MD |
| Entity Address, Address Line One | 360 South Rosemary Avenue |
| Entity Address, Address Line Two | Suite 1420 |
| Entity Address, City or Town | West Palm Beach |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33401 |
| City Area Code | (312) |
| Local Phone Number | 832-1440 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| Common shares | |
| Title of 12(b) Security | Common shares |
| Trading Symbol | RSF |
| Security Exchange Name | NYSE |
| 5.875% Series A Term Preferred Stock | |
| Title of 12(b) Security | 5.875% Series A Term Preferred Stock |
| Trading Symbol | RMPL |
| Security Exchange Name | NYSE |
