| Cover | Dec. 16, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Document Period End Date | Dec. 16, 2024 |
| Entity Registrant Name | MSC Income Fund, Inc. |
| Entity Incorporation, State or Country Code | MD |
| Securities Act File Number | 814-00939 |
| Entity Tax Identification Number | 45-3999996 |
| Entity Address, Address Line One | 1300 Post Oak Boulevard |
| Entity Address, Address Line Two | 8th Floor |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77056 |
| City Area Code | 713 |
| Local Phone Number | 350-6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Description | MSC Income Fund, Inc. (the “Company”) is filing this Form 8-K/A as an amendment (the “Amendment”) to its Current Report on Form 8-K filed with the Securities and Exchange Commission (the “SEC”) on December 16, 2024 (the “Original Form 8-K”), solely to refile a corrected Exhibit 3.1 to the Original Form 8-K (Articles of Amendment to the Articles of Amendment and Restatement, or the “Articles of Amendment”). The corrected version of the Articles of Amendment is filed as Exhibit 3.1 hereto and supersedes and replaces in its entirety Exhibit 3.1 to the Original Form 8-K. Except as stated in this Explanatory Note, this Amendment does not otherwise change or update the disclosure set forth in the Original Form 8-K. |
| Entity Central Index Key | 0001535778 |
| Amendment Flag | true |
| Current Fiscal Year End Date | --12-31 |
