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Shareholder Report
 6 Months Ended
Jan. 31, 2026
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Abacus FCF ETF Trust
Entity Central Index Key 0001604813
Entity Investment Company Type N-1A
Document Period End Date Jan. 31, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Abacus FCF Innovation Leaders ETF  
Shareholder Report [Line Items]  
Fund Name Abacus FCF Innovation Leaders ETF
Class Name Abacus FCF Innovation Leaders ETF
Trading Symbol ABOT
Security Exchange Name CBOE
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Abacus FCF Innovation Leaders ETF for the period of August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://abacusfcf.com/abot/. You can also request this information by contacting us at 1-800-617-0004.
Additional Information Phone Number 1-800-617-0004
Additional Information Website https://abacusfcf.com/abot/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Abacus FCF Innovation Leaders ETF
$19
0.39%
Expenses Paid, Amount $ 19
Expense Ratio, Percent 0.39%
Net Assets $ 4,505,580
Holdings Count | $ / shares 50
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Net Assets
$4,505,580
Number of Holdings
50
Portfolio Turnover
41%
30-Day SEC Yield
0.33%
30-Day SEC Yield Unsubsidized
0.13%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Top 10 Issuers
(% of net assets)
Mount Vernon Liquid Assets Portfolio, LLC
12.9%
NVIDIA Corp.
5.9%
Apple, Inc.
5.1%
Alphabet, Inc.
3.7%
Broadcom, Inc.
3.6%
AbbVie, Inc.
2.9%
Bristol-Myers Squibb Co.
2.8%
Airbnb, Inc.
2.8%
QUALCOMM, Inc.
2.6%
Adobe, Inc.
2.6%
Sector Breakdown (% of net assets)
image
Updated Prospectus Web Address https://abacusfcf.com/abot/
Abacus FCF International Leaders ETF  
Shareholder Report [Line Items]  
Fund Name Abacus FCF International Leaders ETF
Class Name Abacus FCF International Leaders ETF
Trading Symbol ABLG
Security Exchange Name CBOE
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Abacus FCF International Leaders ETF for the period of August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://abacusfcf.com/ablg/. You can also request this information by contacting us at 1-800-617-0004.
Additional Information Phone Number 1-800-617-0004
Additional Information Website https://abacusfcf.com/ablg/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Abacus FCF International Leaders ETF
$29
0.54%
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.54%
Net Assets $ 30,007,052
Holdings Count | $ / shares 52
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Net Assets
$30,007,052
Number of Holdings
52
Portfolio Turnover
35%
30-Day SEC Yield
1.77%
30-Day SEC Yield Unsubsidized
1.77%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Top 10 Issuers
(% of net assets)  
Mount Vernon Liquid Assets Portfolio, LLC
33.7%
Advantest Corp.
6.9%
Taiwan Semiconductor Manufacturing Co. Ltd.
5.0%
Roche Holding AG
3.8%
Novartis AG
3.7%
AstraZeneca PLC
2.9%
Telefonaktiebolaget LM Ericsson
2.8%
LVMH Moet Hennessy Louis Vuitton SE
2.8%
Accenture PLC
2.7%
L’Oreal SA
2.6%
Geographic Breakdown (% of net assets)
image
Sector Breakdown (% of net assets)
image
Updated Prospectus Web Address https://abacusfcf.com/ablg/
Abacus FCF Leaders ETF  
Shareholder Report [Line Items]  
Fund Name Abacus FCF Leaders ETF
Class Name Abacus FCF Leaders ETF
Trading Symbol ABFL
Security Exchange Name CBOE
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Abacus FCF Leaders ETF for the period of August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://abacusfcf.com/abfl/. You can also request this information by contacting us at 1-800-617-0004.
Additional Information Phone Number 1-800-617-0004
Additional Information Website https://abacusfcf.com/abfl/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Abacus FCF Leaders ETF
$25
0.49%
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.49%
Net Assets $ 791,682,447
Holdings Count | $ / shares 62
Investment Company Portfolio Turnover 56.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Net Assets
$791,682,447
Number of Holdings
62
Portfolio Turnover
56%
30-Day SEC Yield
0.46%
30-Day SEC Yield Unsubsidized
0.46%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Top 10 Issuers
(% of net assets)
NVIDIA Corp.
4.9%
Apple, Inc.
4.5%
Lam Research Corp.
3.1%
AbbVie, Inc.
2.9%
Mastercard, Inc.
2.8%
Amgen, Inc.
2.8%
Bristol-Myers Squibb Co.
2.7%
Colgate-Palmolive Co.
2.7%
Gilead Sciences, Inc.
2.6%
Tapestry, Inc.
2.6%
Sector Breakdown (% of net assets)
image
Updated Prospectus Web Address https://abacusfcf.com/abfl/
Abacus FCF Real Assets Leaders ETF  
Shareholder Report [Line Items]  
Fund Name Abacus FCF Real Assets Leaders ETF
Class Name Abacus FCF Real Assets Leaders ETF
Trading Symbol ABLD
Security Exchange Name CBOE
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Abacus FCF Real Assets Leaders ETF for the period of August 1, 2025, to January 31, 2026.    
Additional Information [Text Block] You can find additional information about the Fund at https://abacusfcf.com/abld/. You can also request this information by contacting us at 1-800-617-0004.
Additional Information Phone Number 1-800-617-0004
Additional Information Website https://abacusfcf.com/abld/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Abacus FCF Real Assets Leaders ETF
$21
0.39%
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.39%
Net Assets $ 42,127,238
Holdings Count | $ / shares 58
Investment Company Portfolio Turnover 66.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Net Assets
$42,127,238
Number of Holdings
58
Portfolio Turnover
66%
30-Day SEC Yield
3.85%
30-Day SEC Yield Unsubsidized
3.65%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Top 10 Issuers
(% of net assets)
Mount Vernon Liquid Assets Portfolio, LLC
30.7%
MPLX LP
3.7%
Shell PLC
3.2%
Atlas Copco AB
3.2%
Rockwell Automation, Inc.
2.9%
Cheniere Energy Partners LP
2.8%
Honeywell International, Inc.
2.7%
Axia Energia
2.7%
Simon Property Group, Inc.
2.6%
BHP Group Ltd.
2.6%
Sector Breakdown (% of net assets)
image
Updated Prospectus Web Address https://abacusfcf.com/abld/
Abacus FCF Small Cap Leaders ETF  
Shareholder Report [Line Items]  
Fund Name Abacus FCF Small Cap Leaders ETF
Class Name Abacus FCF Small Cap Leaders ETF
Trading Symbol ABLS
Security Exchange Name CBOE
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Abacus FCF Small Cap Leaders ETF for the period of August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://abacusfcf.com/abls/. You can also request this information by contacting us at 1-800-617-0004.
Additional Information Phone Number 1-800-617-0004
Additional Information Website https://abacusfcf.com/abls/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Abacus FCF Small Cap Leaders ETF
$19
0.39%
Expenses Paid, Amount $ 19
Expense Ratio, Percent 0.39%
Net Assets $ 988,277
Holdings Count | $ / shares 51
Investment Company Portfolio Turnover 76.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Net Assets
$988,277
Number of Holdings
51
Portfolio Turnover
76%
30-Day SEC Yield
0.53%
30-Day SEC Yield Unsubsidized
0.32%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Top 10 Issuers
(% of net assets)
Mount Vernon Liquid Assets Portfolio, LLC
17.0%
Argan, Inc.
9.3%
Collegium Pharmaceutical, Inc.
5.2%
Artisan Partners Asset Management, Inc.
4.3%
LCI Industries
4.0%
Enova International, Inc.
3.8%
Harmony Biosciences Holdings, Inc.
3.2%
PJT Partners, Inc.
3.2%
CommVault Systems, Inc.
3.1%
Healthcare Services Group, Inc.
2.7%
Sector Breakdown (% of net assets)
image
Updated Prospectus Web Address https://abacusfcf.com/abls/
Abacus Flexible Bond Leaders ETF  
Shareholder Report [Line Items]  
Fund Name Abacus Flexible Bond Leaders ETF
Class Name Abacus Flexible Bond Leaders ETF
Trading Symbol ABXB
Security Exchange Name CBOE
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Abacus Flexible Bond Leaders ETF for the period of August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://abacusfcf.com/abxb/. You can also request this information by contacting us at 1-800-617-0004.
Additional Information Phone Number 1-800-617-0004
Additional Information Website https://abacusfcf.com/abxb/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Abacus Flexible Bond Leaders ETF
$20
0.39%
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.39%
Net Assets $ 1,972,832
Holdings Count | $ / shares 6
Investment Company Portfolio Turnover 77.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Net Assets
$1,972,832
Number of Holdings
6
Portfolio Turnover
77%
30-Day SEC Yield
4.54%
30-Day SEC Yield Unsubsidized
4.34%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Top 10 Issuers
(% of net assets)
Mount Vernon Liquid Assets Portfolio, LLC
32.5%
iShares International Treasury Bond ETF
20.2%
iShares J.P. Morgan USD Emerging Markets Bond ETF
20.1%
iShares MBS ETF
20.0%
iShares iBoxx $ High Yield Corporate Bond ETF
19.8%
iShares 0-5 Year High Yield Corporate Bond ETF
19.6%
Security Type Breakdown (% of net assets)
image
Updated Prospectus Web Address https://abacusfcf.com/abxb/