v3.26.1
Investment Risks
Jun. 10, 2026
Twin Oak Apex Opportunities ETF | Affiliated Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Affiliated Fund Risk. Affiliated fund risk is the risk that the Adviser may select investments in other investment companies, including ETFs, (collectively, “Underlying Funds”) for the Fund based on its own financial interests rather than the Fund’s interests. The Adviser may be subject to potential conflicts of interest in selecting the Underlying Funds because the fees paid to the Adviser by some affiliated Underlying Funds may be higher than other Underlying Funds or the Underlying Funds may be in need of assets to enhance their appeal to other investors, liquidity and trading and/or to enable them to carry out their investment strategies. However, the Adviser is a fiduciary to the Fund and is legally obligated to act in the Fund’s best interest when selecting Underlying Funds.

 
Twin Oak Apex Opportunities ETF | Counterparty Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Counterparty Risk. Some of the derivatives entered into by the Fund are not traded on an exchange but instead will be privately negotiated in the over-the-counter market. This means that these instruments are traded between counterparties based on contractual relationships. Relying on a counterparty exposes the Fund to the risk that a counterparty will not settle a transaction in accordance with its terms and conditions because of a dispute over the terms of the contract (whether or not bona fide) or because of a credit or liquidity problem, thus causing the Fund to suffer a loss. A counterparty defaulting on its payment obligations to the Fund will cause the value of an investment in the Fund to decrease.

 
Twin Oak Apex Opportunities ETF | Cyber Security Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Cyber Security Risk. Cyber security risk is the risk of an unauthorized breach and access to Fund assets, Fund or customer data (including private shareholder information), or proprietary information, or the risk of an incident occurring that causes the Fund, the Adviser, the Fund’s investment sub-adviser, custodian, transfer agent, distributor and other service providers and financial intermediaries to suffer data breaches, data corruption or lose operational functionality or prevent Fund investors from purchasing, redeeming or exchanging shares or receiving distributions. The use of artificial intelligence and machine learning could exacerbate these risks. The Fund and the Adviser have limited ability to prevent or mitigate cyber security incidents affecting third-party service providers and such third-party service providers may have limited indemnification obligations to the Fund or the Adviser. Successful cyber-attacks or other cyber-failures or events affecting the Fund or its service providers may adversely impact and cause financial losses to the Fund or its shareholders. Issuers of securities in which the Fund invests are also subject to cyber security risks, and the value of these securities could decline if the issuers experience cyber-attacks or other cyber-failures.

 
Twin Oak Apex Opportunities ETF | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Derivatives Risk. Derivatives include instruments and contracts that are based on, and are valued in relation to, one or more underlying securities, financial benchmarks or indices, such as futures, options, swap and forward contracts. Derivatives typically have economic leverage inherent in their terms. Such leverage will magnify any losses. See “Leverage Risk” below. The use of derivatives is a highly specialized activity that involves investment techniques and risks different from those associated with investments in more traditional securities and instruments. The use of derivatives is also subject to operational and legal risks. Operational risks generally refer to risks related to potential operational issues, including documentation issues, settlement issues, system failures, inadequate controls and human error. Legal risks generally refer to risks of loss resulting from insufficient documentation, insufficient capacity or authority of a counterparty, or legality or enforceability of a contract. The primary types of derivatives in which the Fund invests in are swaps and options contracts.

 
Twin Oak Apex Opportunities ETF | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Equity Securities Risk. Equity securities represent ownership interests in a company and consist of common stocks, preferred stocks, warrants to acquire common stock, and securities convertible into common stock. Investments in equity securities in general are subject to market risks that may cause their prices to fluctuate over time. Equity securities tend to be more volatile than other investment choices, such as debt and money market instruments. Fluctuations in the value of equity securities in which the Fund invests will cause the NAV of the Fund and Underlying Funds to fluctuate. The value of an investment may decrease in response to overall stock market movements or the value of individual securities. The Fund purchases equity securities traded in the U.S. on registered exchanges or the over-the-counter market.

 
Twin Oak Apex Opportunities ETF | ETF Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●ETF Risk. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks: “Authorized Participants, Market Makers and Liquidity Providers Concentration Risk,” “Cash Transactions Risk,” “Secondary Market Trading Risk,” and “Shares May Trade at Prices Other Than NAV Risk.”

 
Twin Oak Apex Opportunities ETF | Authorized Participants, Market Makers and Liquidity Providers Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Authorized Participants, Market Makers and Liquidity Providers Concentration Risk. Only an authorized participant may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of financial institutions that are institutional investors and may act as authorized participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to net asset value (“NAV”) and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. These events, among others, may lead to the Shares trading at a premium or discount to NAV. Thus, you may pay more (or less) than the NAV when you buy Shares in the secondary market, and you may receive less (or more) than NAV when you sell those Shares in the secondary market. A diminished market for an ETF’s shares substantially increases the risk that a shareholder may pay considerably more or receive significantly less than the underlying value of the ETF shares bought or sold. In periods of market volatility, APs, market makers and/or liquidity providers may be less willing to transact in Shares.

 
Twin Oak Apex Opportunities ETF | Cash Transactions Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Cash Transactions Risk. Unlike certain ETFs, the Fund may effect its creations and redemptions partially or wholly for cash rather than on an in-kind basis. Because of this, the Fund may incur costs such as brokerage costs or be unable to realize certain tax benefits associated with in-kind transfers of portfolio securities that may be realized by other ETFs. These costs may decrease the Fund’s NAV to the extent that the costs are not offset by a transaction fee payable by an AP. Shareholders may be subject to tax on gains they would not otherwise have been subject to and/or at an earlier date than if the Fund had effected redemptions wholly on an in-kind basis.

 
Twin Oak Apex Opportunities ETF | Secondary Market Trading Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Secondary Market Trading Risk. Although Shares are listed on a national securities exchange, Cboe BZX Exchange, Inc. (the “Exchange”), and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that an active or liquid trading market for them will develop or be maintained. In addition, trading in Shares on the Exchange may be halted. Trading may be halted because of market conditions or for reasons that, in the view of the Exchange, make trading in the Fund inadvisable. These may include: (a) the extent to which trading is not occurring in the securities and/or the financial instruments composing the Fund’s portfolio; or (b) whether other unusual conditions or circumstances detrimental to the maintenance of a fair and orderly market are present. During periods of market stress, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount). This risk is heightened in times of market volatility or periods of steep market declines.

 
Twin Oak Apex Opportunities ETF | Shares May Trade at Prices Other Than NAV Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Shares May Trade at Prices Other Than NAV Risk. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. There is a risk that market prices for Fund Shares will vary significantly from the Fund’s NAV.

 

 
Twin Oak Apex Opportunities ETF | Large Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Large Capitalization Companies Risk. The Fund may invest in larger, more established companies, the securities of which may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Larger companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion. The Fund considers large companies to be companies with market capitalizations of $10 billion or greater.

 
Twin Oak Apex Opportunities ETF | Large Shareholder Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Large Shareholder Risk. Certain large shareholders, including APs, may from time to time own a substantial amount of the Fund’s shares. There is no requirement that these shareholders maintain their investment in the Fund. There is a risk that such large shareholders or that the Fund’s shareholders generally may redeem all or a substantial portion of their investments in the Fund in a short period of time, which could have a significant negative impact on the Fund’s NAV, liquidity, and brokerage costs. Large redemptions could also result in tax consequences to shareholders and impact the Fund’s ability to implement its investment strategy.

 
Twin Oak Apex Opportunities ETF | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Leverage Risk. Leverage amplifies changes in the Fund’s NAV and may make the Fund more volatile. Derivatives may create leverage and can result in losses to the Fund that exceed the amount originally invested and may accelerate the rate of losses. There can be no assurance that the Fund’s use of any leverage will be successful. The Fund’s investment exposure can exceed its net assets, sometimes by a significant amount.

 
Twin Oak Apex Opportunities ETF | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Liquidity Risk. The Fund is subject to liquidity risk primarily due to its investments in derivatives. Investments in derivative instruments involve the risk that the Fund may be unable to sell the derivative instrument or sell it at a reasonable price.

 
Twin Oak Apex Opportunities ETF | Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Management Risk. The Fund is subject to the risk of poor investment selection. In other words, the individual investments of the Fund may not perform as well as expected, and/or the Fund’s portfolio management practices may not work to achieve their desired result.

 
Twin Oak Apex Opportunities ETF | Market Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Market Risk. The NAV of the Fund will change with changes in the market value of its portfolio positions. Investors may lose money. The value of investments held by the Fund may increase or decrease in response to economic, political, financial, public health crises (such as epidemics or pandemics) or other disruptive events (whether real, expected or perceived) in the U.S. and global markets. Although the Fund will invest in stocks the Adviser believes will produce less volatility, there is no guarantee that the stocks will perform as expected.

 
Twin Oak Apex Opportunities ETF | New Adviser Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●New Adviser Risk. Twin Oak is a newly registered investment adviser and has not had an extensive history of serving as an adviser or sub-adviser to a registered investment company. As a result, there is no long-term track record against which an investor may judge the Adviser and it is possible the Adviser may not achieve the Fund’s intended investment objective.

 
Twin Oak Apex Opportunities ETF | New Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●New Fund Risk. The Fund is a newly organized, management investment company with no operating history. In addition, there can be no assurance that the Fund will grow to, or maintain, an economically viable size, in which case the Board of Trustees (“Board”) of The RBB Fund Trust (the “Trust”) may determine to liquidate the Fund.

 
Twin Oak Apex Opportunities ETF | Operational Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties, or other third parties, failed or inadequate processes and technology or systems failures. The Fund and its Adviser and Sub-Adviser seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

 
Twin Oak Apex Opportunities ETF | Options Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Options Risk. Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks. The Fund may not fully benefit from or may lose money on an option if changes in its value do not correspond as anticipated to changes in the value of the underlying securities.

 
Twin Oak Apex Opportunities ETF | Small and Medium Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Small and Medium Capitalization Companies Risk. The Fund may invest in small and medium-size companies, the securities of which can be more volatile in price than those of larger companies. Positions in smaller companies, especially when the Fund is a large holder of a small company’s securities, also may be more difficult or expensive to trade. The Fund considers small companies to be companies with market capitalizations of less than $1 billion and medium-size companies to have market capitalizations of less than $10 billion but greater than or equal to $1 billion.

 
Twin Oak Apex Opportunities ETF | Structured Note Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Structured Note Risk. Structured notes are notes where the principal and/or interest is determined by reference to the performance of a specific asset, benchmark asset, financial instrument, market or interest rate. Generally, investments in such notes are used as a substitute for positions in underlying indicators and involve many of the same risks associated with a direct investment in the underlying indicator the notes seek to replicate. Structured notes may be exchange-traded or traded over-the-counter and privately negotiated.

 
Twin Oak Apex Opportunities ETF | Swap Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Swap Risk. In a standard “swap” transaction, two parties agree to exchange the returns, differentials in rates of return or some other amount earned or realized on the “notional amount” of predetermined investments or instruments, which may be adjusted for an interest factor. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged, are subject to the risk that the counterparty may default on the obligation, and may be difficult to value. Swaps are subject to tracking risk because they may not be perfect substitutes for the instruments they are intended to hedge or replace. Over the counter swaps are subject to counterparty default. Leverage inherent in derivatives will tend to magnify the Fund’s losses.

 
Twin Oak Apex Opportunities ETF | Underlying Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Underlying Funds Risk. To the extent the Fund invests in other investment companies, including money market funds and ETFs, its performance will be affected by the performance of those Underlying Funds. Investments in Underlying Funds are subject to the risks of the Underlying Funds’ investments, as well as to the Underlying Funds’ expenses. The Fund may incur brokerage fees in connection with its purchase of ETF shares. An ETF may trade in the secondary market at a price below the value of its underlying portfolio and may not be liquid. An actively managed ETF’s performance will reflect its adviser’s ability to make investment decisions that are suited to achieving the ETF’s investment objectives. A passively managed ETF may not replicate the performance of the index it intends to track.

 
Twin Oak Apex Opportunities ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.
Twin Oak Apex Opportunities ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Non-Diversification Risk. The Fund is a non-diversified investment company, which means that more of the Fund’s assets may be invested in the securities of a single issuer than could be invested in the securities of a single issuer by a diversified investment company. This may make the value of the Shares more susceptible to certain risks than shares of a diversified investment company. As a non-diversified fund, the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.

 
Twin Oak Horizons ETF | Affiliated Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Affiliated Fund Risk. Affiliated fund risk is the risk that the Adviser may select investments in other investment companies, including ETFs, (collectively, “Underlying Funds”) for the Fund based on its own financial interests rather than the Fund’s interests. The Adviser may be subject to potential conflicts of interest in selecting the Underlying Funds because the fees paid to the Adviser by some affiliated Underlying Funds may be higher than other Underlying Funds or the Underlying Funds may be in need of assets to enhance their appeal to other investors, liquidity and trading and/or to enable them to carry out their investment strategies. However, the Adviser is a fiduciary to the Fund and is legally obligated to act in the Fund’s best interest when selecting Underlying Funds.

 
Twin Oak Horizons ETF | Counterparty Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Counterparty Risk. Some of the derivatives entered into by the Fund are not traded on an exchange but instead will be privately negotiated in the over-the-counter market. This means that these instruments are traded between counterparties based on contractual relationships. Relying on a counterparty exposes the Fund to the risk that a counterparty will not settle a transaction in accordance with its terms and conditions because of a dispute over the terms of the contract (whether or not bona fide) or because of a credit or liquidity problem, thus causing the Fund to suffer a loss. A counterparty defaulting on its payment obligations to the Fund will cause the value of an investment in the Fund to decrease.

 
Twin Oak Horizons ETF | Cyber Security Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Cyber Security Risk. Cyber security risk is the risk of an unauthorized breach and access to Fund assets, Fund or customer data (including private shareholder information), or proprietary information, or the risk of an incident occurring that causes the Fund, the Adviser, the Fund’s investment sub-adviser, custodian, transfer agent, distributor and other service providers and financial intermediaries to suffer data breaches, data corruption or lose operational functionality or prevent Fund investors from purchasing, redeeming or exchanging shares or receiving distributions. The use of artificial intelligence and machine learning could exacerbate these risks. The Fund and the Adviser have limited ability to prevent or mitigate cyber security incidents affecting third-party service providers and such third-party service providers may have limited indemnification obligations to the Fund or the Adviser. Successful cyber-attacks or other cyber-failures or events affecting the Fund or its service providers may adversely impact and cause financial losses to the Fund or its shareholders. Issuers of securities in which the Fund invests are also subject to cyber security risks, and the value of these securities could decline if the issuers experience cyber-attacks or other cyber-failures.

 
Twin Oak Horizons ETF | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Derivatives Risk. Derivatives include instruments and contracts that are based on, and are valued in relation to, one or more underlying securities, financial benchmarks or indices, such as futures, options, swap and forward contracts. Derivatives typically have economic leverage inherent in their terms. Such leverage will magnify any losses. See “Leverage Risk” below. The use of derivatives is a highly specialized activity that involves investment techniques and risks different from those associated with investments in more traditional securities and instruments. The use of derivatives is also subject to operational and legal risks. Operational risks generally refer to risks related to potential operational issues, including documentation issues, settlement issues, system failures, inadequate controls and human error. Legal risks generally refer to risks of loss resulting from insufficient documentation, insufficient capacity or authority of a counterparty, or legality or enforceability of a contract. The primary types of derivatives in which the Fund invests in are swaps and options contracts.

 
Twin Oak Horizons ETF | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Equity Securities Risk. Equity securities represent ownership interests in a company and consist of common stocks, preferred stocks, warrants to acquire common stock, and securities convertible into common stock. Investments in equity securities in general are subject to market risks that may cause their prices to fluctuate over time. Equity securities tend to be more volatile than other investment choices, such as debt and money market instruments. Fluctuations in the value of equity securities in which the Fund invests will cause the NAV of the Fund and Underlying Funds to fluctuate. The value of an investment may decrease in response to overall stock market movements or the value of individual securities. The Fund purchases equity securities traded in the U.S. on registered exchanges or the over-the-counter market.

 
Twin Oak Horizons ETF | ETF Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●ETF Risk. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks: “Authorized Participants, Market Makers and Liquidity Providers Concentration Risk,” “Cash Transactions Risk,” “Secondary Market Trading Risk,” and “Shares May Trade at Prices Other Than NAV Risk.”

 
Twin Oak Horizons ETF | Authorized Participants, Market Makers and Liquidity Providers Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Authorized Participants, Market Makers and Liquidity Providers Concentration Risk. Only an authorized participant may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of financial institutions that are institutional investors and may act as authorized participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to net asset value (“NAV”) and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. These events, among others, may lead to the Shares trading at a premium or discount to NAV. Thus, you may pay more (or less) than the NAV when you buy Shares in the secondary market, and you may receive less (or more) than NAV when you sell those Shares in the secondary market. A diminished market for an ETF’s shares substantially increases the risk that a shareholder may pay considerably more or receive significantly less than the underlying value of the ETF shares bought or sold. In periods of market volatility, APs, market makers and/or liquidity providers may be less willing to transact in Shares.

 
Twin Oak Horizons ETF | Cash Transactions Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Cash Transactions Risk. Unlike certain ETFs, the Fund may effect its creations and redemptions partially or wholly for cash rather than on an in-kind basis. Because of this, the Fund may incur costs such as brokerage costs or be unable to realize certain tax benefits associated with in-kind transfers of portfolio securities that may be realized by other ETFs. These costs may decrease the Fund’s NAV to the extent that the costs are not offset by a transaction fee payable by an AP. Shareholders may be subject to tax on gains they would not otherwise have been subject to and/or at an earlier date than if the Fund had effected redemptions wholly on an in-kind basis.

 
Twin Oak Horizons ETF | Secondary Market Trading Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Secondary Market Trading Risk. Although Shares are listed on a national securities exchange, Cboe BZX Exchange, Inc. (the “Exchange”), and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that an active or liquid trading market for them will develop or be maintained. In addition, trading in Shares on the Exchange may be halted. Trading may be halted because of market conditions or for reasons that, in the view of the Exchange, make trading in the Fund inadvisable. These may include: (a) the extent to which trading is not occurring in the securities and/or the financial instruments composing the Fund’s portfolio; or (b) whether other unusual conditions or circumstances detrimental to the maintenance of a fair and orderly market are present. During periods of market stress, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount). This risk is heightened in times of market volatility or periods of steep market declines.

 
Twin Oak Horizons ETF | Shares May Trade at Prices Other Than NAV Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Shares May Trade at Prices Other Than NAV Risk. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. There is a risk that market prices for Fund Shares will vary significantly from the Fund’s NAV.

 

 
Twin Oak Horizons ETF | Large Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Large Capitalization Companies Risk. The Fund may invest in larger, more established companies, the securities of which may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Larger companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion. The Fund considers large companies to be companies with market capitalizations of $10 billion or greater.

 
Twin Oak Horizons ETF | Large Shareholder Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Large Shareholder Risk. Certain large shareholders, including APs, may from time to time own a substantial amount of the Fund’s shares. There is no requirement that these shareholders maintain their investment in the Fund. There is a risk that such large shareholders or that the Fund’s shareholders generally may redeem all or a substantial portion of their investments in the Fund in a short period of time, which could have a significant negative impact on the Fund’s NAV, liquidity, and brokerage costs. Large redemptions could also result in tax consequences to shareholders and impact the Fund’s ability to implement its investment strategy.

 
Twin Oak Horizons ETF | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Leverage Risk. Leverage amplifies changes in the Fund’s NAV and may make the Fund more volatile. Derivatives may create leverage and can result in losses to the Fund that exceed the amount originally invested and may accelerate the rate of losses. There can be no assurance that the Fund’s use of any leverage will be successful. The Fund’s investment exposure can exceed its net assets, sometimes by a significant amount.

 
Twin Oak Horizons ETF | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Liquidity Risk. The Fund is subject to liquidity risk primarily due to its investments in derivatives. Investments in derivative instruments involve the risk that the Fund may be unable to sell the derivative instrument or sell it at a reasonable price.

 
Twin Oak Horizons ETF | Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Management Risk. The Fund is subject to the risk of poor investment selection. In other words, the individual investments of the Fund may not perform as well as expected, and/or the Fund’s portfolio management practices may not work to achieve their desired result.

 
Twin Oak Horizons ETF | Market Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Market Risk. The NAV of the Fund will change with changes in the market value of its portfolio positions. Investors may lose money. The value of investments held by the Fund may increase or decrease in response to economic, political, financial, public health crises (such as epidemics or pandemics) or other disruptive events (whether real, expected or perceived) in the U.S. and global markets. Although the Fund will invest in stocks the Adviser believes will produce less volatility, there is no guarantee that the stocks will perform as expected.

 
Twin Oak Horizons ETF | New Adviser Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●New Adviser Risk. Twin Oak is a newly registered investment adviser and has not had an extensive history of serving as an adviser or sub-adviser to a registered investment company. As a result, there is no long-term track record against which an investor may judge the Adviser and it is possible the Adviser may not achieve the Fund’s intended investment objective.

 
Twin Oak Horizons ETF | New Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●New Fund Risk. The Fund is a newly organized, management investment company with no operating history. In addition, there can be no assurance that the Fund will grow to, or maintain, an economically viable size, in which case the Board of Trustees (“Board”) of The RBB Fund Trust (the “Trust”) may determine to liquidate the Fund.

 
Twin Oak Horizons ETF | Operational Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties, or other third parties, failed or inadequate processes and technology or systems failures. The Fund and its Adviser and Sub-Adviser seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

 
Twin Oak Horizons ETF | Options Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Options Risk. Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks. The Fund may not fully benefit from or may lose money on an option if changes in its value do not correspond as anticipated to changes in the value of the underlying securities.

 
Twin Oak Horizons ETF | Small and Medium Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Small and Medium Capitalization Companies Risk. The Fund may invest in small and medium-size companies, the securities of which can be more volatile in price than those of larger companies. Positions in smaller companies, especially when the Fund is a large holder of a small company’s securities, also may be more difficult or expensive to trade. The Fund considers small companies to be companies with market capitalizations of less than $1 billion and medium-size companies to have market capitalizations of less than $10 billion but greater than or equal to $1 billion.

 
Twin Oak Horizons ETF | Structured Note Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Structured Note Risk. Structured notes are notes where the principal and/or interest is determined by reference to the performance of a specific asset, benchmark asset, financial instrument, market or interest rate. Generally, investments in such notes are used as a substitute for positions in underlying indicators and involve many of the same risks associated with a direct investment in the underlying indicator the notes seek to replicate. Structured notes may be exchange-traded or traded over-the-counter and privately negotiated.

 
Twin Oak Horizons ETF | Swap Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Swap Risk. In a standard “swap” transaction, two parties agree to exchange the returns, differentials in rates of return or some other amount earned or realized on the “notional amount” of predetermined investments or instruments, which may be adjusted for an interest factor. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged, are subject to the risk that the counterparty may default on the obligation, and may be difficult to value. Swaps are subject to tracking risk because they may not be perfect substitutes for the instruments they are intended to hedge or replace. Over the counter swaps are subject to counterparty default. Leverage inherent in derivatives will tend to magnify the Fund’s losses.

 
Twin Oak Horizons ETF | Underlying Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Underlying Funds Risk. To the extent the Fund invests in other investment companies, including money market funds and ETFs, its performance will be affected by the performance of those Underlying Funds. Investments in Underlying Funds are subject to the risks of the Underlying Funds’ investments, as well as to the Underlying Funds’ expenses. The Fund may incur brokerage fees in connection with its purchase of ETF shares. An ETF may trade in the secondary market at a price below the value of its underlying portfolio and may not be liquid. An actively managed ETF’s performance will reflect its adviser’s ability to make investment decisions that are suited to achieving the ETF’s investment objectives. A passively managed ETF may not replicate the performance of the index it intends to track.

 
Twin Oak Horizons ETF | Fixed Income Securities Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Fixed Income Securities Risks. Fixed income securities in which the Fund or an Underlying Fund may invest are subject to certain risks, including:

 
Twin Oak Horizons ETF | Bank Loan Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Bank Loan Risk. The Fund’s investments in secured and unsecured participations in bank loans and assignments of such loans may create substantial risk. In making investments in such loans, which are made by banks or other financial intermediaries to borrowers, the Fund will depend primarily upon the creditworthiness of the borrower for payment of principal and interest. If the Fund does not receive scheduled interest or principal payments on such indebtedness, the Fund’s share price could be adversely affected. The Fund may invest in loan participations that are rated by a nationally recognized statistical rating organization or are unrated, and may invest in loan participations of any credit quality, including “distressed” companies with respect to which there is a substantial risk of losing the entire amount invested. In addition, certain bank loans in which the Fund may invest may be illiquid and, therefore, difficult to value and/or sell at a price that is beneficial to the Fund.

 
Twin Oak Horizons ETF | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Credit Risk. Credit risk is the risk that the issuer of a security will not be able to make payments of interest and principal when due. Deterioration in the financial condition of an issuer or deterioration in general economic conditions could cause an issuer to fail to make timely payments of principal and interest. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may affect the value of the Fund’s investments in that issuer. A credit agency’s rating represents the organization’s opinion as to the credit quality of a security but is not an absolute standard of quality or guarantee as to the creditworthiness of an issuer. Ratings from a credit agency present an inherent conflict of interest, because the agency is paid by the entities whose securities they rate. Rating agencies may fail to move quickly enough to change ratings in response to changing circumstances, and a rating may not reflect the fine shadings of risks within a given quality grade.

 
Twin Oak Horizons ETF | High Yield Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○High Yield Securities Risk. High-yield securities or junk bonds are often considered to be speculative and involve greater risk of default or price changes than investment grade fixed-income securities due to changes in the issuer’s or the market’s perception of an issuer’s creditworthiness. The issuers of these securities may not be as financially strong as the issuers of higher rated securities. Prices of lower-rated securities have been found to be less sensitive to interest rate changes and more sensitive to adverse economic changes and individual corporate developments than more highly rated investments. When a security’s rating is reduced below investment grade, it may be more difficult for the Fund to receive income from its investment.

 
Twin Oak Horizons ETF | Liquidity Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Liquidity Risk. Liquidity risk is the risk that a limited market for a security may make it difficult for that security to be sold at an advantageous time or price, which could prevent the Fund from selling the security at the approximate price that it is valued or the time it desires to sell. Liquidity risk may be magnified during times of instability in the credit markets, rising interest rates, high selling activity, or other circumstances where investor redemptions from fixed income securities may be higher than normal. The capacity of traditional dealers to engage in fixed income trading has not kept pace with the fixed income market’s growth, causing dealer inventories to be at or near historical lows relative to market size. The reduction in dealer inventories could lead to decreased liquidity, increased volatility and wider spreads, which may become exacerbated during periods of economic or political stress. Lower rated securities may be subject to greater levels of liquidity risk. If a fixed income security is downgraded or declines in price, the market demand may be limited, making that security difficult to sell. Additionally, the market for certain fixed-income securities may become illiquid under adverse market or economic conditions, independent of any specific adverse changes in the conditions of a particular issuer.

 
Twin Oak Horizons ETF | Maturity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Maturity Risk. Longer-term securities generally have greater price fluctuations and are more sensitive to interest rate changes than shorter-term securities. Therefore, the Fund may experience greater price fluctuations when it holds securities with longer maturities.

 
Twin Oak Horizons ETF | Mortgage Backed and Asset-Backed Securities [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Mortgage Backed and Asset-Backed Securities. Asset-backed securities may be affected by factors concerning the interests in and structure of the issuer or the originator of the receivables, the creditworthiness of the entities that provide any supporting letters of credit or other credit enhancements or the market’s assessment of the quality of the underlying security. Investments in mortgage- and asset-backed securities are subject to prepayment or call risk, which is the risk that payments from the borrower may be received earlier than expected due to changes in the rate at which the underlying loans are prepaid. Securities may be prepaid at a price less than the original purchase value.

 
Twin Oak Horizons ETF | Other Asset-Backed Securities [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○Other Asset-Backed Securities. Asset-backed securities may be affected by factors concerning the interests in and structure of the issuer or the originator of the receivables, the creditworthiness of the entities that provide any supporting letters of credit or other credit enhancements or the market’s assessment of the quality of the underlying security.

 
Twin Oak Horizons ETF | U.S. Government Securities [Member]  
Prospectus [Line Items]  
Risk [Text Block]
○U.S. Government Securities. Some U.S. Government securities, such as U.S. Government agency notes and bonds, are neither insured nor guaranteed by the U.S. Government, meaning they are only supported by the right of the issuer to borrow from the U.S. Government or by the credit of the agency issuing the obligation. If the Fund invests in a U.S. Government security that is not backed by the U.S. Government, there is no assurance that the U.S. Government would provide support, and the Fund’s performance could be adversely impacted if there is a deterioration in the financial condition of the issuer.

 
Twin Oak Horizons ETF | Floating Rate Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Floating Rate Securities Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their coupon rates do not reset as high, or as quickly, as comparable market interest rates, and generally carry lower yields than fixed-rate securities of the same maturity. Although floating rate securities are less sensitive to interest rate risk than fixed-rate securities, they are subject to credit risk, which could impair their value.

 
Twin Oak Horizons ETF | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Interest Rate Risk. Interest rate changes can be sudden and unpredictable and a wide variety of factors can cause interest rates to rise, such as central bank monetary policies, inflation rates, supply and demand and general economic conditions. The value of the Fund’s shares generally is expected to increase during periods of falling interest rates and to decrease during periods of rising interest rates. The magnitude of these fluctuations will generally be greater if the Fund holds securities with longer maturities or lower quality ratings. The interest earned on the Fund’s investments in fixed income securities may decline when prevailing interest rates fall. The Fund is also subject to the risk that the income generated by its investments may not keep pace with inflation.

 
Twin Oak Horizons ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.
Twin Oak Horizons ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
●Non-Diversification Risk. The Fund is a non-diversified investment company, which means that more of the Fund’s assets may be invested in the securities of a single issuer than could be invested in the securities of a single issuer by a diversified investment company. This may make the value of the Shares more susceptible to certain risks than shares of a diversified investment company. As a non-diversified fund, the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.