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Shareholder Report
 6 Months Ended
Mar. 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name First Trust Exchange-Traded Fund II
Entity Central Index Key 0001364608
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2025
C000051966 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust STOXX® European Select Dividend Index Fund
Class Name First Trust STOXX® European Select Dividend Index Fund
Trading Symbol FDD
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust STOXX® European Select Dividend Index Fund (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FDD. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FDD
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust STOXX® European Select Dividend Index Fund $31 0.59%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.59% [1]
Net Assets $ 226,089,776
Holdings Count | Holding 31
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $226,089,776
Total number of portfolio holdings 31
Portfolio turnover rate 23%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Aker BP ASA 6.0%
Legal & General Group PLC 5.3%
Taylor Wimpey PLC 5.1%
Rio Tinto PLC 4.1%
ABN AMRO Bank N.V. 4.0%
AP Moller - Maersk A/S, Class A 4.0%
NN Group N.V. 3.9%
HSBC Holdings PLC 3.6%
Rubis S.C.A. 3.6%
Volkswagen AG 3.5%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Aker BP ASA 6.0%
Legal & General Group PLC 5.3%
Taylor Wimpey PLC 5.1%
Rio Tinto PLC 4.1%
ABN AMRO Bank N.V. 4.0%
AP Moller - Maersk A/S, Class A 4.0%
NN Group N.V. 3.9%
HSBC Holdings PLC 3.6%
Rubis S.C.A. 3.6%
Volkswagen AG 3.5%
C000051967 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Alerian Disruptive Technology Real Estate ETF
Class Name First Trust Alerian Disruptive Technology Real Estate ETF
Trading Symbol DTRE
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Alerian Disruptive Technology Real Estate ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/DTRE. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/DTRE
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Alerian Disruptive Technology Real Estate ETF $29 0.60%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.60% [2]
Net Assets $ 15,468,003
Holdings Count | Holding 31
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $15,468,003
Total number of portfolio holdings 31
Portfolio turnover rate 18%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
American Tower Corp. 7.7%
Crown Castle, Inc. 7.5%
SBA Communications Corp. 7.0%
Prologis, Inc. 6.7%
Equinix, Inc. 5.4%
Digital Realty Trust, Inc. 5.0%
EastGroup Properties, Inc. 4.3%
First Industrial Realty Trust, Inc. 4.2%
STAG Industrial, Inc. 4.2%
Segro PLC 4.2%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
American Tower Corp. 7.7%
Crown Castle, Inc. 7.5%
SBA Communications Corp. 7.0%
Prologis, Inc. 6.7%
Equinix, Inc. 5.4%
Digital Realty Trust, Inc. 5.0%
EastGroup Properties, Inc. 4.3%
First Industrial Realty Trust, Inc. 4.2%
STAG Industrial, Inc. 4.2%
Segro PLC 4.2%
C000054156 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Dow Jones Global Select Dividend Index Fund
Class Name First Trust Dow Jones Global Select Dividend Index Fund
Trading Symbol FGD
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Dow Jones Global Select Dividend Index Fund (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FGD. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FGD
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Dow Jones Global Select Dividend Index Fund $28 0.56%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.56% [3]
Net Assets $ 592,355,690
Holdings Count | Holding 100
Investment Company Portfolio Turnover 37.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $592,355,690
Total number of portfolio holdings 100
Portfolio turnover rate 37%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Enagas S.A. 1.9%
Kohl’s Corp. 1.8%
Phoenix Group Holdings PLC 1.7%
Spark New Zealand Ltd. 1.7%
BCE, Inc. 1.7%
Labrador Iron Ore Royalty Corp. 1.4%
Peyto Exploration & Development Corp. 1.4%
AP Moller - Maersk A/S, Class A 1.3%
Henderson Land Development Co., Ltd. 1.3%
Western Union (The) Co. 1.3%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Enagas S.A. 1.9%
Kohl’s Corp. 1.8%
Phoenix Group Holdings PLC 1.7%
Spark New Zealand Ltd. 1.7%
BCE, Inc. 1.7%
Labrador Iron Ore Royalty Corp. 1.4%
Peyto Exploration & Development Corp. 1.4%
AP Moller - Maersk A/S, Class A 1.3%
Henderson Land Development Co., Ltd. 1.3%
Western Union (The) Co. 1.3%
C000066484 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Global Wind Energy ETF
Class Name First Trust Global Wind Energy ETF
Trading Symbol FAN
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Global Wind Energy ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FAN. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FAN
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Global Wind Energy ETF $27 0.60%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.60% [4]
Net Assets $ 130,402,542
Holdings Count | Holding 49
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $130,402,542
Total number of portfolio holdings 49
Portfolio turnover rate 14%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Orsted A/S 7.5%
Vestas Wind Systems A/S 7.4%
Northland Power, Inc. 7.3%
EDP Renovaveis S.A. 5.6%
China Longyuan Power Group Corp., Ltd., Class H 4.6%
Nordex SE 4.3%
Boralex, Inc., Class A 3.7%
RBC Dominion Securities, Inc. 3.2%
Citigroup, Inc. 3.0%
Century Iron & Steel Industrial Co., Ltd. 2.5%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Orsted A/S 7.5%
Vestas Wind Systems A/S 7.4%
Northland Power, Inc. 7.3%
EDP Renovaveis S.A. 5.6%
China Longyuan Power Group Corp., Ltd., Class H 4.6%
Nordex SE 4.3%
Boralex, Inc., Class A 3.7%
RBC Dominion Securities, Inc. 3.2%
Citigroup, Inc. 3.0%
Century Iron & Steel Industrial Co., Ltd. 2.5%
C000071160 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Alerian U.S. NextGen Infrastructure ETF
Class Name First Trust Alerian U.S. NextGen Infrastructure ETF
Trading Symbol RBLD
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Alerian U.S. NextGen Infrastructure ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/RBLD. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/RBLD
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Alerian U.S. NextGen Infrastructure ETF $32 0.65%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65% [5]
Net Assets $ 13,145,672
Holdings Count | Holding 102
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $13,145,672
Total number of portfolio holdings 102
Portfolio turnover rate 12%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Consolidated Edison, Inc. 1.3%
Okta, Inc. 1.3%
American Tower Corp. 1.2%
Exelon Corp. 1.2%
American Water Works Co., Inc. 1.2%
VeriSign, Inc. 1.2%
Crown Castle, Inc. 1.2%
American Electric Power Co., Inc. 1.2%
CenterPoint Energy, Inc. 1.2%
WEC Energy Group, Inc. 1.2%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Consolidated Edison, Inc. 1.3%
Okta, Inc. 1.3%
American Tower Corp. 1.2%
Exelon Corp. 1.2%
American Water Works Co., Inc. 1.2%
VeriSign, Inc. 1.2%
Crown Castle, Inc. 1.2%
American Electric Power Co., Inc. 1.2%
CenterPoint Energy, Inc. 1.2%
WEC Energy Group, Inc. 1.2%
C000081044 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust NASDAQ® Clean Edge® Smart Grid Infrastructure Index Fund
Class Name First Trust NASDAQ® Clean Edge® Smart Grid Infrastructure Index Fund
Trading Symbol GRID
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust NASDAQ® Clean Edge® Smart Grid Infrastructure Index Fund (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/GRID. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/GRID
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust NASDAQ® Clean Edge® Smart Grid Infrastructure Index Fund $26 0.56%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.56% [6]
Net Assets $ 2,009,750,683
Holdings Count | Holding 108
Investment Company Portfolio Turnover 9.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $2,009,750,683
Total number of portfolio holdings 108
Portfolio turnover rate 9%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
National Grid PLC 8.8%
ABB Ltd. 7.9%
Schneider Electric SE 7.8%
Johnson Controls International PLC 7.7%
Eaton Corp. PLC 7.6%
Quanta Services, Inc. 4.0%
Hubbell, Inc. 3.6%
Prysmian S.p.A. 3.5%
Aptiv PLC 2.8%
Terna-Rete Elettrica Nazionale 2.7%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Any amount shown as 0.0% represents less than 0.1%.
Largest Holdings [Text Block]
Top Ten Holdings
National Grid PLC 8.8%
ABB Ltd. 7.9%
Schneider Electric SE 7.8%
Johnson Controls International PLC 7.7%
Eaton Corp. PLC 7.6%
Quanta Services, Inc. 4.0%
Hubbell, Inc. 3.6%
Prysmian S.p.A. 3.5%
Aptiv PLC 2.8%
Terna-Rete Elettrica Nazionale 2.7%
C000087410 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Indxx Global Natural Resources Income ETF
Class Name First Trust Indxx Global Natural Resources Income ETF
Trading Symbol FTRI
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Indxx Global Natural Resources Income ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTRI. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FTRI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Indxx Global Natural Resources Income ETF $35 0.70%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.70% [7]
Net Assets $ 91,386,563
Holdings Count | Holding 52
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $91,386,563
Total number of portfolio holdings 52
Portfolio turnover rate 4%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Agnico Eagle Mines Ltd. 9.2%
Canadian Natural Resources Ltd. 9.0%
Freeport-McMoRan, Inc. 8.8%
American Water Works Co., Inc. 5.9%
RBC Dominion Securities, Inc. 4.5%
JPMorgan Chase & Co. 4.4%
Ecopetrol S.A., ADR 4.2%
Weyerhaeuser Co. 3.9%
Nutrien Ltd. 3.8%
Kinross Gold Corp. 3.3%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Agnico Eagle Mines Ltd. 9.2%
Canadian Natural Resources Ltd. 9.0%
Freeport-McMoRan, Inc. 8.8%
American Water Works Co., Inc. 5.9%
RBC Dominion Securities, Inc. 4.5%
JPMorgan Chase & Co. 4.4%
Ecopetrol S.A., ADR 4.2%
Weyerhaeuser Co. 3.9%
Nutrien Ltd. 3.8%
Kinross Gold Corp. 3.3%
C000087411 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Indxx Global Agriculture ETF
Class Name First Trust Indxx Global Agriculture ETF
Trading Symbol FTAG
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Indxx Global Agriculture ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTAG. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FTAG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Indxx Global Agriculture ETF $34 0.70%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.70% [8]
Net Assets $ 5,827,494
Holdings Count | Holding 47
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $5,827,494
Total number of portfolio holdings 47
Portfolio turnover rate 8%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Deere & Co. 9.9%
Corteva, Inc. 9.8%
BASF SE 8.9%
Mahindra & Mahindra Ltd. 8.7%
Nutrien Ltd. 4.4%
Industries Qatar QSC 4.4%
Bayer AG 4.3%
Wilmar International Ltd. 3.8%
CNH Industrial N.V. 3.7%
Kubota Corp. 3.4%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Deere & Co. 9.9%
Corteva, Inc. 9.8%
BASF SE 8.9%
Mahindra & Mahindra Ltd. 8.7%
Nutrien Ltd. 4.4%
Industries Qatar QSC 4.4%
Bayer AG 4.3%
Wilmar International Ltd. 3.8%
CNH Industrial N.V. 3.7%
Kubota Corp. 3.4%
C000092838 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Indxx NextG ETF
Class Name First Trust Indxx NextG ETF
Trading Symbol NXTG
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Indxx NextG ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/NXTG. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/NXTG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Indxx NextG ETF $34 0.70%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.70% [9]
Net Assets $ 340,030,429
Holdings Count | Holding 105
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $340,030,429
Total number of portfolio holdings 105
Portfolio turnover rate 8%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Xiaomi Corp., Class B 2.0%
ZTE Corp., Class H 1.6%
NEC Corp. 1.6%
Nokia Oyj, ADR 1.5%
BT Group PLC 1.4%
Elisa Oyj 1.4%
Sony Group Corp. 1.4%
Lenovo Group Ltd. 1.4%
American Tower Corp. 1.4%
Kyocera Corp. 1.4%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Xiaomi Corp., Class B 2.0%
ZTE Corp., Class H 1.6%
NEC Corp. 1.6%
Nokia Oyj, ADR 1.5%
BT Group PLC 1.4%
Elisa Oyj 1.4%
Sony Group Corp. 1.4%
Lenovo Group Ltd. 1.4%
American Tower Corp. 1.4%
Kyocera Corp. 1.4%
C000101722 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust S-NetworkFuture Vehicles & Technology ETF
Class Name First Trust S-NetworkFuture Vehicles & Technology ETF
Trading Symbol CARZ
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust S-Network Future Vehicles & Technology ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/CARZ. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/CARZ
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust S-Network Future Vehicles & Technology ETF $34 0.70%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.70% [10]
Net Assets $ 29,614,539
Holdings Count | Holding 102
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $29,614,539
Total number of portfolio holdings 102
Portfolio turnover rate 27%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Samsung Electronics Co., Ltd. 5.0%
QUALCOMM, Inc. 4.6%
Texas Instruments, Inc. 4.5%
Toyota Motor Corp. 4.5%
Apple, Inc. 4.4%
Microsoft Corp. 4.2%
Advanced Micro Devices, Inc. 4.0%
Taiwan Semiconductor Manufacturing Co., Ltd., ADR 3.8%
Alphabet, Inc., Class A 3.8%
NVIDIA Corp. 3.7%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Samsung Electronics Co., Ltd. 5.0%
QUALCOMM, Inc. 4.6%
Texas Instruments, Inc. 4.5%
Toyota Motor Corp. 4.5%
Apple, Inc. 4.4%
Microsoft Corp. 4.2%
Advanced Micro Devices, Inc. 4.0%
Taiwan Semiconductor Manufacturing Co., Ltd., ADR 3.8%
Alphabet, Inc., Class A 3.8%
NVIDIA Corp. 3.7%
C000102221 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Cloud Computing ETF
Class Name First Trust Cloud Computing ETF
Trading Symbol SKYY
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Cloud Computing ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/SKYY. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/SKYY
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Cloud Computing ETF $30 0.60%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.60% [11]
Net Assets $ 3,087,588,579
Holdings Count | Holding 64
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $3,087,588,579
Total number of portfolio holdings 64
Portfolio turnover rate 14%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
International Business Machines Corp. 4.5%
Microsoft Corp. 4.3%
Alphabet, Inc., Class A 4.2%
Nutanix, Inc., Class A 4.1%
Amazon.com, Inc. 4.1%
Pure Storage, Inc., Class A 3.9%
Oracle Corp. 3.8%
Arista Networks, Inc. 3.8%
Akamai Technologies, Inc. 3.0%
Cisco Systems, Inc. 2.9%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
International Business Machines Corp. 4.5%
Microsoft Corp. 4.3%
Alphabet, Inc., Class A 4.2%
Nutanix, Inc., Class A 4.1%
Amazon.com, Inc. 4.1%
Pure Storage, Inc., Class A 3.9%
Oracle Corp. 3.8%
Arista Networks, Inc. 3.8%
Akamai Technologies, Inc. 3.0%
Cisco Systems, Inc. 2.9%
C000146603 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust International Equity Opportunities ETF
Class Name First Trust International Equity Opportunities ETF
Trading Symbol FPXI
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust International Equity Opportunities ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FPXI. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FPXI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust International Equity Opportunities ETF $34 0.70%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.70% [12]
Net Assets $ 129,928,149
Holdings Count | Holding 52
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $129,928,149
Total number of portfolio holdings 52
Portfolio turnover rate 59%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Alibaba Group Holding Ltd., ADR 7.3%
Spotify Technology S.A. 6.5%
ARM Holdings PLC, ADR 5.2%
Caixa Seguridade Participacoes S.A. 5.2%
Gen Digital, Inc. 4.2%
Trip.com Group Ltd., ADR 4.1%
Krafton, Inc. 3.7%
Agnico Eagle Mines Ltd. 3.6%
Pop Mart International Group Ltd. 3.6%
Constellation Software, Inc. 3.2%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Alibaba Group Holding Ltd., ADR 7.3%
Spotify Technology S.A. 6.5%
ARM Holdings PLC, ADR 5.2%
Caixa Seguridade Participacoes S.A. 5.2%
Gen Digital, Inc. 4.2%
Trip.com Group Ltd., ADR 4.1%
Krafton, Inc. 3.7%
Agnico Eagle Mines Ltd. 3.6%
Pop Mart International Group Ltd. 3.6%
Constellation Software, Inc. 3.2%
C000159087 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Nasdaq Cybersecurity ETF
Class Name First Trust Nasdaq Cybersecurity ETF
Trading Symbol CIBR
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Nasdaq Cybersecurity ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/CIBR. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/CIBR
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Nasdaq Cybersecurity ETF $30 0.58%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.58% [13]
Net Assets $ 7,875,203,238
Holdings Count | Holding 35
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $7,875,203,238
Total number of portfolio holdings 35
Portfolio turnover rate 10%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Cisco Systems, Inc. 8.0%
Infosys Ltd., ADR 7.5%
CrowdStrike Holdings, Inc., Class A 7.5%
Palo Alto Networks, Inc. 7.4%
Broadcom, Inc. 7.0%
Thales S.A. 5.5%
Okta, Inc. 4.5%
Leidos Holdings, Inc. 4.3%
Check Point Software Technologies Ltd. 4.3%
Zscaler, Inc. 4.2%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Cisco Systems, Inc. 8.0%
Infosys Ltd., ADR 7.5%
CrowdStrike Holdings, Inc., Class A 7.5%
Palo Alto Networks, Inc. 7.4%
Broadcom, Inc. 7.0%
Thales S.A. 5.5%
Okta, Inc. 4.5%
Leidos Holdings, Inc. 4.3%
Check Point Software Technologies Ltd. 4.3%
Zscaler, Inc. 4.2%
C000204700 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust IPOX® Europe Equity Opportunities ETF
Class Name First Trust IPOX® Europe Equity Opportunities ETF
Trading Symbol FPXE
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust IPOX® Europe Equity Opportunities ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FPXE. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FPXE
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust IPOX® Europe Equity Opportunities ETF $34 0.70%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.70% [14]
Net Assets $ 3,863,219
Holdings Count | Holding 104
Investment Company Portfolio Turnover 48.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $3,863,219
Total number of portfolio holdings 104
Portfolio turnover rate 48%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Gen Digital, Inc. 4.9%
Nordnet AB publ 3.5%
Technip Energies N.V. 3.5%
Spotify Technology S.A. 3.5%
ARM Holdings PLC, ADR 3.4%
Lottomatica Group S.p.A. 3.1%
Siemens Energy AG 2.9%
Haleon PLC 2.8%
Cie de Saint-Gobain S.A. 2.5%
IONOS Group SE 2.3%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Gen Digital, Inc. 4.9%
Nordnet AB publ 3.5%
Technip Energies N.V. 3.5%
Spotify Technology S.A. 3.5%
ARM Holdings PLC, ADR 3.4%
Lottomatica Group S.p.A. 3.1%
Siemens Energy AG 2.9%
Haleon PLC 2.8%
Cie de Saint-Gobain S.A. 2.5%
IONOS Group SE 2.3%
C000205597 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Dow Jones International Internet ETF
Class Name First Trust Dow Jones International Internet ETF
Trading Symbol FDNI
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Dow Jones International Internet ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FDNI. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FDNI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Dow Jones International Internet ETF $33 0.65%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.65% [15]
Net Assets $ 38,617,285
Holdings Count | Holding 40
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $38,617,285
Total number of portfolio holdings 40
Portfolio turnover rate 20%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Tencent Holdings Ltd. 10.2%
Alibaba Group Holding Ltd. 10.1%
Shopify, Inc., Class A 9.0%
Meituan, Class B 8.7%
Spotify Technology S.A. 4.9%
JD.com, Inc., Class A 4.8%
Prosus N.V. 4.8%
PDD Holdings, Inc., ADR 4.7%
Naspers Ltd., Class N 4.6%
Adyen N.V. 4.3%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Tencent Holdings Ltd. 10.2%
Alibaba Group Holding Ltd. 10.1%
Shopify, Inc., Class A 9.0%
Meituan, Class B 8.7%
Spotify Technology S.A. 4.9%
JD.com, Inc., Class A 4.8%
Prosus N.V. 4.8%
PDD Holdings, Inc., ADR 4.7%
Naspers Ltd., Class N 4.6%
Adyen N.V. 4.3%
C000234334 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Indxx Metaverse ETF
Class Name First Trust Indxx Metaverse ETF
Trading Symbol ARVR
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Indxx Metaverse ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/ARVR. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/ARVR
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Indxx Metaverse ETF $35 0.70%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.70% [16]
Net Assets $ 3,798,243
Holdings Count | Holding 42
Investment Company Portfolio Turnover 28.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $3,798,243
Total number of portfolio holdings 42
Portfolio turnover rate 28%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Xiaomi Corp., Class B 4.5%
Tencent Holdings Ltd. 4.0%
Sony Group Corp. 3.8%
Nintendo Co., Ltd. 3.7%
Intel Corp. 3.5%
Take-Two Interactive Software, Inc. 3.5%
NetEase, Inc. 3.4%
Netflix, Inc. 3.3%
Electronic Arts, Inc. 3.1%
Nexon Co., Ltd. 3.0%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Xiaomi Corp., Class B 4.5%
Tencent Holdings Ltd. 4.0%
Sony Group Corp. 3.8%
Nintendo Co., Ltd. 3.7%
Intel Corp. 3.5%
Take-Two Interactive Software, Inc. 3.5%
NetEase, Inc. 3.4%
Netflix, Inc. 3.3%
Electronic Arts, Inc. 3.1%
Nexon Co., Ltd. 3.0%
C000234707 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Nasdaq Lux Digital Health Solutions ETF
Class Name First Trust Nasdaq Lux Digital Health Solutions ETF
Trading Symbol EKG
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Nasdaq Lux Digital Health Solutions ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/EKG. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/EKG
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Nasdaq Lux Digital Health Solutions ETF $31 0.65%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.65% [17]
Net Assets $ 2,353,417
Holdings Count | Holding 38
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $2,353,417
Total number of portfolio holdings 38
Portfolio turnover rate 7%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Veeva Systems, Inc., Class A 9.1%
ResMed, Inc. 8.5%
IQVIA Holdings, Inc. 8.3%
Intuitive Surgical, Inc. 7.6%
Dexcom, Inc. 6.8%
QIAGEN N.V. 4.4%
Hologic, Inc. 4.3%
Insulet Corp. 4.3%
Globus Medical, Inc., Class A 4.0%
Natera, Inc. 4.0%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Veeva Systems, Inc., Class A 9.1%
ResMed, Inc. 8.5%
IQVIA Holdings, Inc. 8.3%
Intuitive Surgical, Inc. 7.6%
Dexcom, Inc. 6.8%
QIAGEN N.V. 4.4%
Hologic, Inc. 4.3%
Insulet Corp. 4.3%
Globus Medical, Inc., Class A 4.0%
Natera, Inc. 4.0%
C000240529 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Bloomberg Emerging Market Democracies ETF
Class Name First Trust Bloomberg Emerging Market Democracies ETF
Trading Symbol EMDM
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Bloomberg Emerging Market Democracies ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/EMDM. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/EMDM
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Bloomberg Emerging Market Democracies ETF $37 0.75%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.75% [18]
Net Assets $ 7,589,704
Holdings Count | Holding 101
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $7,589,704
Total number of portfolio holdings 101
Portfolio turnover rate 10%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Taiwan Semiconductor Manufacturing Co., Ltd. 10.1%
Samsung Electronics Co., Ltd. 6.5%
Naspers Ltd., Class N 6.5%
Grupo Mexico S.A.B. de C.V., Series B 4.1%
Powszechna Kasa Oszczednosci Bank Polski S.A. 3.8%
Petroleo Brasileiro S.A. 3.6%
FirstRand Ltd. 3.2%
OTP Bank Nyrt 3.2%
Standard Bank Group Ltd. 2.9%
Fomento Economico Mexicano S.A.B. de C.V., Series UBD 2.6%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Taiwan Semiconductor Manufacturing Co., Ltd. 10.1%
Samsung Electronics Co., Ltd. 6.5%
Naspers Ltd., Class N 6.5%
Grupo Mexico S.A.B. de C.V., Series B 4.1%
Powszechna Kasa Oszczednosci Bank Polski S.A. 3.8%
Petroleo Brasileiro S.A. 3.6%
FirstRand Ltd. 3.2%
OTP Bank Nyrt 3.2%
Standard Bank Group Ltd. 2.9%
Fomento Economico Mexicano S.A.B. de C.V., Series UBD 2.6%
C000245005 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust Emerging Markets Human Flourishing ETF
Class Name First Trust Emerging Markets Human Flourishing ETF
Trading Symbol FTHF
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Emerging Markets Human Flourishing ETF (the “Fund”) for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FTHF. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FTHF
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Emerging Markets Human Flourishing ETF $37 0.75%(1)
​(1)
Annualized.
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.75% [19]
Net Assets $ 39,304,193
Holdings Count | Holding 101
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $39,304,193
Total number of portfolio holdings 101
Portfolio turnover rate 20%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Taiwan Semiconductor Manufacturing Co., Ltd. 7.8%
Samsung Electronics Co., Ltd. 7.1%
Gold Fields Ltd. 4.3%
Itau Unibanco Holding S.A. 3.6%
Wal-Mart de Mexico S.A.B. de C.V. 3.3%
WEG S.A. 2.8%
ORLEN S.A. 2.4%
Grupo Financiero Banorte S.A.B. de C.V., Class O 2.3%
FirstRand Ltd. 2.1%
Powszechna Kasa Oszczednosci Bank Polski S.A. 1.9%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Taiwan Semiconductor Manufacturing Co., Ltd. 7.8%
Samsung Electronics Co., Ltd. 7.1%
Gold Fields Ltd. 4.3%
Itau Unibanco Holding S.A. 3.6%
Wal-Mart de Mexico S.A.B. de C.V. 3.3%
WEG S.A. 2.8%
ORLEN S.A. 2.4%
Grupo Financiero Banorte S.A.B. de C.V., Class O 2.3%
FirstRand Ltd. 2.1%
Powszechna Kasa Oszczednosci Bank Polski S.A. 1.9%
C000253539 [Member]  
Shareholder Report [Line Items]  
Fund Name First Trust BloombergArtificial Intelligence ETF
Class Name First Trust BloombergArtificial Intelligence ETF
Trading Symbol FAI
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the First Trust Bloomberg Artificial Intelligence ETF (the “Fund”) for the period of November 20, 2024 (commencement of investment operations) to March 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FAI. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com.
Additional Information Phone Number 1-800-621-1675
Additional Information Email info@ftportfolios.com
Additional Information Website www.ftportfolios.com/fund-documents/etf/FAI
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
First Trust Bloomberg Artificial Intelligence ETF $22(1) 0.65%(2)
​(1)
The Fund commenced investment operations on November 20, 2024. Had the Fund been in operation for a complete six months, the cost of a $10,000 investment would have been higher.
​(2)
Annualized.
Expenses Paid, Amount $ 22 [20]
Expense Ratio, Percent 0.65% [21]
Net Assets $ 8,078,141
Holdings Count | Holding 50
Investment Company Portfolio Turnover 9.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (As of March 31, 2025)
Fund net assets $8,078,141
Total number of portfolio holdings 50
Portfolio turnover rate 9%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (As of March 31, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Meta Platforms, Inc., Class A 8.9%
Microsoft Corp. 8.3%
Amazon.com, Inc. 7.9%
Alphabet, Inc., Class A 7.5%
NVIDIA Corp. 7.0%
Palantir Technologies, Inc., Class A 4.9%
ASML Holding N.V. 4.4%
Adobe, Inc. 4.2%
Taiwan Semiconductor Manufacturing Co., Ltd. 4.0%
Oracle Corp. 3.9%
Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Meta Platforms, Inc., Class A 8.9%
Microsoft Corp. 8.3%
Amazon.com, Inc. 7.9%
Alphabet, Inc., Class A 7.5%
NVIDIA Corp. 7.0%
Palantir Technologies, Inc., Class A 4.9%
ASML Holding N.V. 4.4%
Adobe, Inc. 4.2%
Taiwan Semiconductor Manufacturing Co., Ltd. 4.0%
Oracle Corp. 3.9%
[1] Annualized.
[2] Annualized.
[3] Annualized.
[4] Annualized.
[5] Annualized.
[6] Annualized.
[7] Annualized.
[8] Annualized.
[9] Annualized.
[10] Annualized.
[11] Annualized.
[12] Annualized.
[13] Annualized.
[14] Annualized.
[15] Annualized.
[16] Annualized.
[17] Annualized.
[18] Annualized.
[19] Annualized.
[20] The Fund commenced investment operations on November 20, 2024. Had the Fund been in operation for a complete six months, the cost of a $10,000 investment would have been higher.
[21] Annualized.