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Abacus FCF Small Cap Leaders ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Abacus FCF Small Cap Leaders ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Abacus FCF Small Cap Leaders ETF (the “Fund”) seeks to provide investment results that correspond, before fees and expenses, generally to the performance of the Abacus FCF Small Cap Leaders Index (the “Underlying Index”).
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold and sell Shares. You may also pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 28, 2026
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund may pay transaction costs, including commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. The Fund is newly organized, and, as of the date of this Prospectus, has not had any portfolio turnover.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates “Other Expenses” are based on estimated amounts for the current fiscal year.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. The example also assumes that the Fund provides a return of 5% per year and that operating expenses remain the same and that the Fee Waiver Agreement remains in place for the contractual period. The example does not reflect any brokerage commissions that you may pay on purchases and sales of Shares.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
To pursue its investment objective, the Fund invests, under normal market circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in component securities of the Underlying Index. The Underlying Index is sponsored and maintained by Abacus FCF Indexes LLC (the “Index Provider”), an affiliate of the Adviser. The Underlying Index is a rules-based equity index designed to track the performance of the small-cap segment of U.S. publicly traded companies with strong free cash flow return on invested capital (“FCF-ROIC”), as identified by the Index Provider through extensive historical research. The Fund intends to maintain a portfolio of securities that generally replicates the holdings of the Underlying Index. As of the date of this Prospectus, the only securities included in the Underlying Index are common stock.
To be eligible for inclusion in the Underlying Index, an equity security must meet the following requirements (“Eligible Securities”): (i) be listed in the U.S.; (ii) fall within the small-cap category, as defined by the Index Provider, based on market capitalization; (iii) satisfy certain trading volume criteria; and (iv) have been issued by a company that has reported specific financial metrics within the last year, including but not limited to (a) free cash flow, (b) net income, and (c) revenue. The Index Provider considers a security to be within the small-cap category if it is in the smallest 85% to 97% of the cumulative market cap of all stocks listed on U.S. stock exchanges at time of selection, which, as of February 18, 2025, results in companies being deemed within the small-cap category if they have a market capitalization of $6.8 billion or less at the time of reconstitution.

The Underlying Index utilizes the Adviser’s proprietary Abacus FCF Leaders Model (the “Model”) to evaluate Eligible Securities and scores them based on FCF-ROIC. The Model assesses companies through a detailed analysis of factors such as capital expenditure, accruals, cash flow margins and asset turnover to identify companies with strong and sustainable profitability. These securities are assigned active weights primarily based on their FCF-ROIC characteristics, with adjustments for company-specific risk using a proprietary factor derived from the historical volatility of each Eligible Security’s stock price over the preceding 12-month period. The resulting risk-adjusted score is used to calculate active weights for each security, which are combined with their free-float market capitalization. The Underlying Index includes those remaining Eligible Securities until one of the following thresholds is met: (1) over 90% of the cumulative weight of the Eligible Securities has been included in the Underlying Index, or (2) the number of included securities reaches 50. The weights of all securities are then rescaled to construct the final portfolio, seeking to ensure high-conviction exposure to small-cap companies with strong FCF-ROIC metrics.
The Underlying Index is rebalanced and reconstituted quarterly, with a portfolio turnover cap of 25%. The Fund’s portfolio is generally rebalanced and reconstituted quarterly, in accordance with the Underlying Index.
The Fund can use derivative instruments, including exchange-traded futures contracts, to gain exposure to component securities of the Underlying Index.
The Fund will concentrate its investments (i.e., invest more than 25% of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. As of January 27, 2025, the Underlying Index was concentrated in the consumer discretionary sector.
The Fund is non-diversified, which means that it can invest a greater percentage of its assets in any one issuer than a diversified fund can.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund will concentrate its investments (i.e., invest more than 25% of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. As of January 27, 2025, the Underlying Index was concentrated in the consumer discretionary sector.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
On February 18, 2025, all of the assets of a separately managed account (the “Predecessor Account”), which had been managed by the Adviser since March 18, 2021, and had investment policies, objectives, guidelines and restrictions that were in all material respects equivalent to those of the Fund, were transferred to the Fund in a tax-free transaction (the “Transaction”). Performance shown for periods prior to the date of the Transaction represents the performance of the Predecessor Account. Prior to the date of the Transaction, the Fund had not commenced investment operations. The Predecessor Account was not registered under the 1940 Act and therefore was not subject to certain investment restrictions that are imposed by the 1940 Act on registered investment companies. If the Predecessor Account had been registered under the 1940 Act, the Predecessor Account’s performance may have been adversely affected. 
The following performance information indicates some of the risks of investing in the Fund. The bar chart shows the Fund’s and the Predecessor Account’s performance from year to year as of December 31. The table illustrates how the Fund’s and the Predecessor Account’s average annual returns for the 1-year and since inception periods compare with those of a broad measure of market performance, a style-specific index (one reflecting the market segments in which the Fund invests) and the index the Fund seeks to track, in that order. The Fund’s and Predecessor Account’s past performance, before and after taxes, does not necessarily indicate how the Fund will perform in the future. The Predecessor Account’s performance shown below has been recalculated using the Fund’s management fee, which has the effect of reducing the Predecessor Account’s performance. In addition, the Predecessor Account did not pay dividends and distributions. As a result, there are no after-tax returns for the Predecessor Account. Updated performance information is also available on the Fund’s website at www.abacusfcf.com .
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information indicates some of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.abacusfcf.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s and Predecessor Account’s past performance, before and after taxes, does not necessarily indicate how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock For the year-to-date period ended December 31, 2024, the Fund’s and Predecessor Account’s total return was 9.29%. During the period of time shown in the bar chart, the Fund’s and Predecessor Account’s highest quarterly return was 13.43% for the quarter ended September 30, 2024, and the lowest quarterly return was -15.41% for the quarter ended June 30, 2022.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date period
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Dec. 31, 2024
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 9.29%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2024
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.43%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.41%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the Period Ended December 31, 2024
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Shares through tax-advantaged arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes. Actual
after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-advantaged arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
Abacus FCF Small Cap Leaders ETF | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investor may lose money by investing in the Fund.
Abacus FCF Small Cap Leaders ETF | Equity Investing Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Investing Risk. An investment in the Fund involves risks similar to those of investing in any fund holding equity securities, such as market fluctuations, changes in interest rates and perceived trends in stock prices. The values of equity securities could decline generally or could underperform other investments. In addition, securities may decline in value due to factors affecting a specific issuer, market or securities markets generally.
Abacus FCF Small Cap Leaders ETF | Small Capitalization Company Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Small Capitalization Company Risk. Investing in securities of small capitalization companies involves greater risk than customarily is associated with investing in larger, more established companies. These companies’ securities may be more volatile and less liquid than those of more established companies. Often, small capitalization companies and the industries in which they focus are still evolving and, as a result, they may be more sensitive to changing market conditions. Small capitalization companies may be particularly affected by interest rate increases, as they may find it more difficult to borrow money to continue or expand operations or may have difficulty in repaying any loans which are floating rate.
Abacus FCF Small Cap Leaders ETF | Geographic Region Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Geographic Region Risk. Because the Fund invests a significant portion of its assets in the U.S., the Fund will generally have more exposure to economic risks affecting the U.S. In the event of economic or political turmoil or a deterioration of diplomatic relations in the U.S., the Fund may experience substantial illiquidity or reduction in the value of the Fund’s investments. Adverse conditions in other countries whose economies appear to be unrelated can also adversely affect the Fund’s U.S. investments.
Abacus FCF Small Cap Leaders ETF | Index-Based Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index-Based Strategy Risk. The Fund is managed as an index-based fund that seeks to track the performance of the Underlying Index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the Fund may hold the component securities of the Underlying Index regardless of the current or projected performance of a specific security or the relevant market as a whole. Maintaining investments in securities regardless of market conditions or the performance of individual securities could cause the Fund’s returns to be lower than if the Fund employed an active strategy. The Fund will seek to track the Underlying Index in all market conditions, including during adverse market conditions when other funds may seek to take temporary defensive measures (such as investing significantly in cash or cash equivalents). Accordingly, unless the Underlying Index allocates significant portions of its assets to cash and/or cash equivalents during times of adverse market or
economic conditions, the Fund may be subject to a higher level of market risk during such times than other funds. Further, the Underlying Index methodology is designed to provide exposure to a limited number of securities, which results in the Fund holding a more limited number of securities. As a result, each investment has a greater effect on the Fund’s overall performance and any change in the value of these securities could significantly affect the value of your investment in the Fund. Additionally, the Fund generally rebalances and reconstitutes its portfolio in accordance with the Underlying Index and, therefore, any changes to the Underlying Index’s rebalance or reconstitution schedule will typically result in corresponding changes to the Fund’s rebalance or reconstitution schedule.
Abacus FCF Small Cap Leaders ETF | Market Events Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Market Events Risk. The value of securities in the Fund’s portfolio may decline due to daily fluctuations in the securities markets that are generally beyond the Fund’s control, including the quality of the Fund’s investments, economic conditions, adverse investor sentiment, lower demand for a company’s goods or services, and general market conditions. In a declining market, the prices for all securities (including those in the Fund’s portfolio) may decline, regardless of their long-term prospects. Security values tend to move in cycles, with periods when securities markets generally rise and periods when they generally decline. In addition, local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issue, recessions, natural disasters, or other events could have a significant impact on the Fund, its investments and the trading of its Shares.
Abacus FCF Small Cap Leaders ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Non-Diversified Fund Risk. The Fund is considered non-diversified and may be more susceptible to factors negatively impacting its holdings to the extent the Fund invests more of its assets in the securities of fewer issuers than would a diversified fund.
Abacus FCF Small Cap Leaders ETF | Concentration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Concentration Risk. A fund concentrated in an industry or group of industries is likely to present more risks than a fund that is broadly diversified over several industries or groups of industries. Compared to the broad market, an individual industry or group of related industries may be more strongly affected by changes in the economic climate, broad market shifts, moves in a particular dominant stock or regulatory changes.
Abacus FCF Small Cap Leaders ETF | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. A derivative instrument derives its value from an underlying security, currency, commodity, interest rate, index or other asset (collectively, “underlying asset”). The Fund’s investments in derivatives may pose risks in addition to and greater than those associated with investing directly in the underlying assets, including counterparty, leverage and liquidity risks. Derivatives may also be harder to value, less tax efficient and subject to changing government regulation that could impact the Fund’s ability to use certain derivatives or their cost. Derivatives strategies may not always be successful.
•    Futures Contracts Risk. Exchange-traded futures contracts are a type of derivative, which call for the future delivery of an asset, or cash settlement, at a certain stated price on a specified future date. Futures contracts involve the risk of imperfect correlation between movements in the price of the instruments and the price of the underlying assets. In addition, there is the risk that the Fund may not be able to enter into a closing transaction because of an illiquid market. Exchanges can limit the number of positions that can be held or controlled by the Fund or the Adviser, thus limiting the ability to implement the Fund’s strategies. Futures markets are highly volatile, and the use of futures may increase the volatility of the Fund’s NAV.
Abacus FCF Small Cap Leaders ETF | Derivatives Risk, Futures Contracts Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
•    Futures Contracts Risk. Exchange-traded futures contracts are a type of derivative, which call for the future delivery of an asset, or cash settlement, at a certain stated price on a specified future date. Futures contracts involve the risk of imperfect correlation between movements in the price of the instruments and the price of the underlying assets. In addition, there is the risk that the Fund may not be able to enter into a closing transaction because of an illiquid market. Exchanges can limit the number of positions that can be held or controlled by the Fund or the Adviser, thus limiting the ability to implement the Fund’s strategies. Futures markets are highly volatile, and the use of futures may increase the volatility of the Fund’s NAV.
Abacus FCF Small Cap Leaders ETF | Index Correlation Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Correlation Risk. While the Adviser seeks to track the performance of the Underlying Index closely (i.e., to achieve a high degree of correlation with the Underlying Index), the Fund’s returns may not match or achieve a high degree of correlation with the returns of the Underlying Index due to
operating expenses, transaction costs, cash flows, regulatory requirements and/or operational inefficiencies.
Abacus FCF Small Cap Leaders ETF | Index Calculation Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Calculation Risk. The Underlying Index relies on various sources of information to assess the criteria of issuers included in the Underlying Index, including information that may be based on assumptions and estimates. The Fund, the Index Provider, the Adviser, the Underlying Index calculation agent and any of their respective affiliates cannot offer assurances that the Underlying Index’s calculation methodology or sources of information will provide an accurate assessment of included issuers at any particular time.
Abacus FCF Small Cap Leaders ETF | Affiliated Index Provider Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Affiliated Index Provider Risk. The Index Provider is an affiliated person of the Adviser, which poses the appearance of a conflict of interest. For example, a potential conflict could arise if the Adviser, as an affiliate of the Index Provider, were to exercise undue influence with respect to regular and/or extraordinary updates to the methodology or composition of the Underlying Index, including in a manner that might improve the apparent performance of the Fund relative to the performance of the Underlying Index. Additionally, potential conflicts could arise to the extent that portfolio managers of the Adviser become aware of contemplated methodology changes or rebalance activity prior to disclosure to the public, which could facilitate “front running” on behalf of other funds or accounts managed by the Adviser with similar exposure. Although the Adviser and the Index Provider have taken steps designed to ensure that these potential conflicts are mitigated (e.g., via the adoption of policies and procedures that are designed to minimize potential conflicts of interest and the implementation of informational barriers designed to minimize the potential for the misuse of information about the Underlying Index), there can be no assurance that such measures will be successful.
Abacus FCF Small Cap Leaders ETF | Risk Of Having A Transferred Basis In Shares Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Risk of Having a Transferred Basis in Shares. An investment in Shares will be less tax efficient than an investment in other ETFs because the Fund’s initial portfolio was deposited in-kind by a seed investor whose cost basis in the securities was lower than the market value of such securities on the date of such deposit. Under the tax code, such in-kind contribution resulted in the seed investor’s lower basis in those securities being transferred to the Fund. As a result, if any securities with the lower basis are sold by the Fund, the Fund will realize higher amounts of realized gains upon the sale of such portfolio securities than otherwise would be the case had the Fund not received such in-kind deposit, and may be required to distribute capital gains, including long-term capital gains, to all shareholders (inclusive of, but not limited to, the seed investor) upon the sale of such portfolio securities. Please consult your tax advisor about the potential tax consequences. Nonetheless, because the Fund intends to transact with APs primarily in kind, it does not currently anticipate significant tax impacts to investors as a result of the in-kind seed investment.
Abacus FCF Small Cap Leaders ETF | ETF Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
ETF Risk. As an exchange-traded fund (“ETF”), the Fund is subject to the following risks:
•    Authorized Participants Concentration Risk. The Fund may have a limited number of financial institutions that may act as Authorized Participants (“APs”). To the extent that those APs exit the business or are unable to process creation and/or redemption orders, Shares may trade at a discount to NAV and possibly face delisting.
•    Flash Crash Risk. Sharp price declines in securities owned by the Fund may trigger trading halts, which may result in Shares trading in the market at an increasingly large discount to NAV during part (or all) of a trading day. Shareholders could suffer significant losses to the extent that they sell Shares at these temporarily low market prices.
•    Large Shareholder Risk. Certain shareholders, including the Adviser or its affiliates, or groups of related shareholders, such as those investing through one or more model portfolios, may own a substantial amount of the Shares. The disposition of Shares by large shareholders, resulting in redemptions through or by APs, could have a significant negative impact on the Fund. In addition, transactions by large shareholders may account for a large percentage of the trading volume on the Exchange and may, therefore, have a material upward or downward effect on the market price of the Shares. The form of a large shareholder’s contribution and any redemption activity in the Fund can adversely affect the tax efficiency of the Fund.
•    Premium-Discount Risk. Shares may trade above or below their NAV. Accordingly, investors may pay more than NAV when purchasing Shares or receive less than NAV when selling Shares. The market prices of Shares will generally fluctuate in accordance with changes in NAV, changes in the relative supply of, and demand for, Shares, and changes in the liquidity, or the perceived liquidity, of the Fund’s holdings.
•    Secondary Market Trading Risk. Investors buying or selling Shares in the secondary market may pay brokerage commissions or other charges, which may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of Shares. Although the Shares are listed on 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.
Abacus FCF Small Cap Leaders ETF | ETF Risk, Authorized Participants Concentration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
•    Authorized Participants Concentration Risk. The Fund may have a limited number of financial institutions that may act as Authorized Participants (“APs”). To the extent that those APs exit the business or are unable to process creation and/or redemption orders, Shares may trade at a discount to NAV and possibly face delisting.
Abacus FCF Small Cap Leaders ETF | ETF Risk, Flash Crash Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
•    Flash Crash Risk. Sharp price declines in securities owned by the Fund may trigger trading halts, which may result in Shares trading in the market at an increasingly large discount to NAV during part (or all) of a trading day. Shareholders could suffer significant losses to the extent that they sell Shares at these temporarily low market prices.
Abacus FCF Small Cap Leaders ETF | ETF Risk, Large Shareholder Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
•    Large Shareholder Risk. Certain shareholders, including the Adviser or its affiliates, or groups of related shareholders, such as those investing through one or more model portfolios, may own a substantial amount of the Shares. The disposition of Shares by large shareholders, resulting in redemptions through or by APs, could have a significant negative impact on the Fund. In addition, transactions by large shareholders may account for a large percentage of the trading volume on the Exchange and may, therefore, have a material upward or downward effect on the market price of the Shares. The form of a large shareholder’s contribution and any redemption activity in the Fund can adversely affect the tax efficiency of the Fund.
Abacus FCF Small Cap Leaders ETF | ETF Risk, Premium-Discount Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
•    Premium-Discount Risk. Shares may trade above or below their NAV. Accordingly, investors may pay more than NAV when purchasing Shares or receive less than NAV when selling Shares. The market prices of Shares will generally fluctuate in accordance with changes in NAV, changes in the relative supply of, and demand for, Shares, and changes in the liquidity, or the perceived liquidity, of the Fund’s holdings.
Abacus FCF Small Cap Leaders ETF | ETF Risk, Secondary Market Trading Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
•    Secondary Market Trading Risk. Investors buying or selling Shares in the secondary market may pay brokerage commissions or other charges, which may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of Shares. Although the Shares are listed on 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.
Abacus FCF Small Cap Leaders ETF | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 500 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.02%
Since Inception rr_AverageAnnualReturnSinceInception 13.04% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 18, 2021
Abacus FCF Small Cap Leaders ETF | Russell 2000® Total Return Index
(reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 2000® Total Return Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 11.54%
Since Inception rr_AverageAnnualReturnSinceInception 0.93% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 18, 2021
Abacus FCF Small Cap Leaders ETF | Abacus FCF Small Cap Leaders Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Abacus FCF Small Cap Leaders Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 9.40%
Since Inception rr_AverageAnnualReturnSinceInception 8.54% [1],[2]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 18, 2021
Abacus FCF Small Cap Leaders ETF | Abacus FCF Small Cap Leaders ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol ABLS
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.59% [3]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.59%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.20%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 40
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 148
Annual Return 2022 rr_AnnualReturn2022 (19.78%)
Annual Return 2023 rr_AnnualReturn2023 26.78%
Annual Return 2024 rr_AnnualReturn2024 9.29%
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.29%
Since Inception rr_AverageAnnualReturnSinceInception 6.95% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 18, 2021
[1] The Predecessor Account commenced investment operations on March 18, 2021.  
[2] The performance for the Abacus FCF Small Cap Leaders Index is provided as of 3/31/2021 as the Index does not have performance data prior to that date. 
[3] The management fee is structured as a “unified fee,” pursuant to which the Fund’s investment adviser pays all expenses of the Fund, except for the management fee, payments under the Fund’s Rule 12b-1 plan, brokerage expenses, acquired fund fees and expenses, taxes, interest (including borrowing costs and dividend expenses on securities sold short), litigation expenses and other extraordinary expenses (including litigation to which the Trust or the Fund may be a party and indemnification of the Trustees and officers with respect thereto).
[4] “Other Expenses” are based on estimated amounts for the current fiscal year.
[5] Abacus FCF Advisors LLC, the Fund’s investment adviser (the “Adviser”), has contractually agreed to waive a portion of the Fund’s management fee equal to 0.20% of the Fund’s average daily net assets through at least November 28, 2026, which will have the effect of reducing the Fund’s expenses (the “Fee Waiver Agreement”). While the Adviser or the Fund may discontinue the Fee Waiver Agreement after the contractual period, it may only be terminated during its term by either party upon written notice; provided that such termination shall require the approval of the Fund’s Board of Trustees.