| N-2 | Jul. 22, 2024 |
| Cover [Abstract] | |
| Entity Central Index Key | 0001732078 |
| Amendment Flag | true |
| Amendment Description | This Post-Effective No. 7 to the Registration Statement on Form N-2 (File Nos. 333-237929 and 811-23328) of Flat Rock Opportunity Fund (as amended, the “Registration Statement”) is being filed pursuant to Rule 462(d) under the Securities Act of 1933, as amended (the “Securities Act”), solely for the purpose of replacing Exhibit (h)(1) to the Registration Statement and removing Exhibits (k)(1), (k)(2) and (k)(3) from the Registration Statement and replacing with new Exhibit (k)(1). No changes have been made to Part A, B or Part C of the Registration Statement, other than Item 25(2) of Part C as set forth below. |
| Document Type | POS EX |
| Entity Registrant Name | Flat Rock Opportunity Fund |
| Entity Address, Address Line One | Corporation Trust Center |
| Entity Address, Address Line Two | 1209 Orange St. |
| Entity Address, City or Town | Wilmington |
| Entity Address, State or Province | DE |
| Entity Address, Postal Zip Code | 19801 |
| City Area Code | (202) |
| Local Phone Number | 383-0262 |
| 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 | 680 S. Cache Street, Suite 100 |
| Entity Address, Address Line Two | P.O. Box 7403 |
| Entity Address, City or Town | Jackson |
| Entity Address, State or Province | WY |
| Entity Address, Postal Zip Code | 83001 |
| City Area Code | (307) |
| Local Phone Number | 500-5200 |
| Contact Personnel Name | Robert K. Grunewald |
