| N-2 | Aug. 24, 2023 |
| Cover [Abstract] | |
| Entity Central Index Key | 0001644771 |
| Amendment Flag | false |
| Document Type | POS EX |
| Entity Registrant Name | RIVERNORTH CAPITAL AND INCOME FUND, INC. |
| Entity Address, Address Line One | 360 South Rosemary Avenue, 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 | (561) |
| Local Phone Number | 484-7185 |
| No Substantive Changes, 462(c) | false |
| Exhibits Only, 462(d) | true |
| Entity Well-known Seasoned Issuer | No |
| Entity Emerging Growth Company | false |
| Business Contact [Member] | |
| Cover [Abstract] | |
| Entity Address, Address Line One | 360 South Rosemary Avenue, Suite 1420 |
| Entity Address, City or Town | West Palm Beach |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33401 |
| Contact Personnel Name | Marcus L. Collins |
