| Document And Entity Information | 6 Months Ended |
| Jun. 30, 2023 | |
| Document Information [Line Items] | |
| Entity Registrant Name | FLAT ROCK OPPORTUNITY FUND |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Entity Central Index Key | 0001732078 |
| Document Period End Date | Jun. 30, 2023 |
| N-2 | 6 Months Ended |
| Jun. 30, 2023 | |
| Cover [Abstract] | |
| Entity Central Index Key | 0001732078 |
| Amendment Flag | false |
| Document Type | N-CSRS |
| Entity Registrant Name | FLAT ROCK OPPORTUNITY FUND |
| General Description of Registrant [Abstract] | |
| Investment Objectives and Practices [Text Block] | INVESTMENT OBJECTIVE Flat Rock Opportunity Fund’s (the “Fund”) investment objective is to generate current income and, as a secondary objective, long-term capital appreciation. |
| Risk Factors [Table Text Block] | 8. RISK FACTORS In the normal course of business, the Fund invests in financial instruments and enters into financial transactions where risk of potential loss exists due to such things as changes in the market (market risk) or failure or inability of the other party to a transaction to perform (credit and counterparty risk). See below for a detailed description of select principal risks. The following list is not intended to be a comprehensive listing of all of the potential risks associated with the Fund. The Fund’s prospectus provides a detailed discussion of the Fund’s risks. CLO Risk: Between the closing date and the effective date of a CLO, the CLO collateral manager will generally expect to purchase additional collateral obligations for the CLO. During this period, the price and availability of these collateral obligations may be adversely affected by a number of market factors, including price volatility and availability of investments suitable for the CLO, which could hamper the ability of the collateral manager to acquire a portfolio of collateral obligations that will satisfy specified concentration limitations and allow the CLO to reach the initial par amount of collateral prior to the effective date. An inability or delay in reaching the target initial par amount of collateral may adversely affect the timing and amount of interest or principal payments received by the holders of the CLO debt securities and distributions of the CLO on equity securities and could result in early redemptions which may cause CLO debt and equity investors to receive less than the face value of their investment. The failure by a CLO in which the Fund invests to satisfy financial covenants, including with respect to adequate collateralization and/or interest coverage tests, could lead to a reduction in the CLO’s payments to the Fund. In the event that a CLO fails certain tests, holders of CLO senior debt may be entitled to additional payments that would, in turn, reduce the payments the Fund would otherwise be entitled to receive. Separately, the Fund may incur expenses to the extent necessary to seek recovery upon default or to negotiate new terms, which may include the waiver of certain financial covenants, with a defaulting CLO or any other investment the Fund may make. If any of these occur, it could adversely affect the Fund’s operating results and cash flows. The Fund’s CLO investments are exposed to leveraged credit risk. If certain minimum collateral value ratios and/or interest coverage ratios are not met by a CLO, primarily due to senior secured loan defaults, then cash flow that otherwise would have been available to pay distributions to the Fund on its CLO investments may instead be used to redeem any senior notes or to purchase additional senior secured loans, until the ratios again exceed the minimum required levels or any senior notes are repaid in full. The Fund’s CLO investments and/or the underlying senior secured loans may prepay more quickly than expected, which could have an adverse impact on the Fund’s net assets. Liquidity Risk: LIBOR Risk: The discontinuation of LIBOR could have a significant impact on the Fund’s business. There could be significant operational challenges for the transition away from LIBOR including, but not limited to, amending loan agreements with borrowers on investments that may have not been modified with fallback language and adding effective fallback language to new agreements in the event that LIBOR is discontinued before maturity. Beyond these challenges, the Fund anticipates there may be additional risks to the Fund’s current processes and information systems that will need to be identified and evaluated by us. Due to the uncertainty of the replacement for LIBOR, the potential effect of any such event on the Fund’s cost of capital and net investment income cannot yet be determined. There is no guarantee that a transition from LIBOR to an alternative will not result in financial market disruptions, significant increases in benchmark rates, or borrowing costs to borrowers, any of which could have a material adverse effect on the Fund’s business, result of operations, and financial condition. Global Markets Risk: Credit Risk. Companies in which the Fund invests could deteriorate as a result of, among other factors, an adverse development in their business, a change in the competitive environment or an economic downturn. As a result, companies that the Adviser may have expected to be stable may operate, or expect to operate, at a loss or have significant variations in operating results, may require substantial additional capital to support their operations or maintain their competitive position, or may otherwise have a weak financial condition or be experiencing financial distress. In addition, inadequacy of collateral or credit enhancement for a debt obligation may affect its credit risk. Although the Fund may invest in investments that the Adviser believes are secured by specific collateral, the value of which may exceed the principal amount of the investments at the time of initial investment, there can be no assurance that the liquidation of any such collateral would satisfy the borrower’s obligation in the event of non-payment of scheduled interest or principal payments with respect to such investment, or that such collateral could be readily liquidated. In addition, in the event of bankruptcy of a borrower, the Fund could experience delays or limitations with respect to its ability to realize the benefits of the collateral securing an investment. Under certain circumstances, collateral securing an investment may be released without the consent of the Fund. Credit risk is typically greater for securities with ratings that are below investment grade (commonly referred to as “junk bonds”). Since the Fund can invest significantly in high-yield investments considered speculative in nature and unsecured investments, this risk may be substantial. The Fund’s right to payment and its security interest, if any, may be subordinated to the payment rights and security interests of more senior creditors. This risk may also be greater to the extent the Fund uses leverage or derivatives in connection with the management of the Fund. Changes in the actual or perceived creditworthiness of an issuer, or a downgrade or default affecting any of the Fund’s securities, could affect the Fund’s performance. Valuation Risk: Interest Rate Risk: |
| CLO Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | CLO Risk: Between the closing date and the effective date of a CLO, the CLO collateral manager will generally expect to purchase additional collateral obligations for the CLO. During this period, the price and availability of these collateral obligations may be adversely affected by a number of market factors, including price volatility and availability of investments suitable for the CLO, which could hamper the ability of the collateral manager to acquire a portfolio of collateral obligations that will satisfy specified concentration limitations and allow the CLO to reach the initial par amount of collateral prior to the effective date. An inability or delay in reaching the target initial par amount of collateral may adversely affect the timing and amount of interest or principal payments received by the holders of the CLO debt securities and distributions of the CLO on equity securities and could result in early redemptions which may cause CLO debt and equity investors to receive less than the face value of their investment. The failure by a CLO in which the Fund invests to satisfy financial covenants, including with respect to adequate collateralization and/or interest coverage tests, could lead to a reduction in the CLO’s payments to the Fund. In the event that a CLO fails certain tests, holders of CLO senior debt may be entitled to additional payments that would, in turn, reduce the payments the Fund would otherwise be entitled to receive. Separately, the Fund may incur expenses to the extent necessary to seek recovery upon default or to negotiate new terms, which may include the waiver of certain financial covenants, with a defaulting CLO or any other investment the Fund may make. If any of these occur, it could adversely affect the Fund’s operating results and cash flows. The Fund’s CLO investments are exposed to leveraged credit risk. If certain minimum collateral value ratios and/or interest coverage ratios are not met by a CLO, primarily due to senior secured loan defaults, then cash flow that otherwise would have been available to pay distributions to the Fund on its CLO investments may instead be used to redeem any senior notes or to purchase additional senior secured loans, until the ratios again exceed the minimum required levels or any senior notes are repaid in full. The Fund’s CLO investments and/or the underlying senior secured loans may prepay more quickly than expected, which could have an adverse impact on the Fund’s net assets. |
| Liquidity Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Liquidity Risk: |
| LIBOR Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | LIBOR Risk: The discontinuation of LIBOR could have a significant impact on the Fund’s business. There could be significant operational challenges for the transition away from LIBOR including, but not limited to, amending loan agreements with borrowers on investments that may have not been modified with fallback language and adding effective fallback language to new agreements in the event that LIBOR is discontinued before maturity. Beyond these challenges, the Fund anticipates there may be additional risks to the Fund’s current processes and information systems that will need to be identified and evaluated by us. Due to the uncertainty of the replacement for LIBOR, the potential effect of any such event on the Fund’s cost of capital and net investment income cannot yet be determined. There is no guarantee that a transition from LIBOR to an alternative will not result in financial market disruptions, significant increases in benchmark rates, or borrowing costs to borrowers, any of which could have a material adverse effect on the Fund’s business, result of operations, and financial condition. |
| Global Markets Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Global Markets Risk: |
| Credit Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Credit Risk. Companies in which the Fund invests could deteriorate as a result of, among other factors, an adverse development in their business, a change in the competitive environment or an economic downturn. As a result, companies that the Adviser may have expected to be stable may operate, or expect to operate, at a loss or have significant variations in operating results, may require substantial additional capital to support their operations or maintain their competitive position, or may otherwise have a weak financial condition or be experiencing financial distress. In addition, inadequacy of collateral or credit enhancement for a debt obligation may affect its credit risk. Although the Fund may invest in investments that the Adviser believes are secured by specific collateral, the value of which may exceed the principal amount of the investments at the time of initial investment, there can be no assurance that the liquidation of any such collateral would satisfy the borrower’s obligation in the event of non-payment of scheduled interest or principal payments with respect to such investment, or that such collateral could be readily liquidated. In addition, in the event of bankruptcy of a borrower, the Fund could experience delays or limitations with respect to its ability to realize the benefits of the collateral securing an investment. Under certain circumstances, collateral securing an investment may be released without the consent of the Fund. Credit risk is typically greater for securities with ratings that are below investment grade (commonly referred to as “junk bonds”). Since the Fund can invest significantly in high-yield investments considered speculative in nature and unsecured investments, this risk may be substantial. The Fund’s right to payment and its security interest, if any, may be subordinated to the payment rights and security interests of more senior creditors. This risk may also be greater to the extent the Fund uses leverage or derivatives in connection with the management of the Fund. Changes in the actual or perceived creditworthiness of an issuer, or a downgrade or default affecting any of the Fund’s securities, could affect the Fund’s performance. |
| Valuation Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Valuation Risk: |
| Interest Rate Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Interest Rate Risk: |
