FT Energy Income Partners Enhanced Income ETF Performance Management - FT Energy Income Partners Enhanced Income ETF	Nov. 30, 2025
Prospectus [Line Items]
Bar Chart and Performance Table [Heading]	<span style="color:#000000;font-family:Arial;font-size:9.90pt;font-weight:bold;">Annual Total Return</span>
Performance Narrative [Text Block]	On February 29, 2024, the shareholders of First Trust Energy Income and Growth Fund, First Trust MLP and Energy Income Fund, First Trust New Opportunities MLP & Energy Fund and First Trust Energy Infrastructure Fund, each a Massachusetts business trust that is registered as a closed-end management investment company (the “Target Funds”), approved an Agreement and Plan of Merger (the “Plan”) by and between the Target Funds, and the Trust, on behalf of the Fund, pursuant to which the Target Funds would (i) transfer all of their assets to the Fund in exchange solely for newly issued shares of the Fund and the Fund’s assumption of all of the liabilities of the Target Funds, and (ii) immediately distribute such newly issued shares of the Fund to shareholders of the Target Funds (the “Mergers”). As a result of the Mergers, the Fund has assumed the performance history of First Trust Energy Infrastructure Fund (the “Predecessor Fund”). As the Predecessor Fund and Fund have a number of differences, including investment policies and practices and that the Predecessor Fund is a closed-end fund which utilizes leverage while the Fund is an exchange-traded fund which does not utilize leverage, the Predecessor Fund’s past performance is not indicative of how the Fund will, or is expected to, perform in the future. Accordingly, any Fund performance and historical returns shown below that incorporates Predecessor Fund performance prior to May 6, 2024 is not indicative of the performance that the Fund would have generated.The bar chart and table below illustrate the annual calendar year returns of the Fund (having assumed the performance of the Predecessor Fund) based on net asset value as well as the average annual Fund returns. The bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance (having assumed the performance of the Predecessor Fund) from year-to-year and by showing how the Fund’s average annual total returns based on net asset value for years 1, 5, 10 (as applicable) and since inception compared to those of a market index and a broad-based securities market index. The Fund’s updated performance information is accessible on the Fund’s website at http://www.ftportfolios.com.
Performance Past Does Not Indicate Future [Text]	<span style="color:#000000;font-family:Arial;font-size:9.00pt;">The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</span>
Performance Information Illustrates Variability of Returns [Text]	<span style="font-family:Arial;font-size:9.00pt;margin-left:0%;">The bar chart and table below illustrate the annual calendar year returns of the Fund (having assumed the performance of the Predecessor Fund) based on net asset value as well as the average annual Fund returns. The bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance (having assumed the performance of the Predecessor Fund) from year-to-year and by showing how the Fund’s average annual total returns based on net asset value </span><span style="font-family:Arial;font-size:9.00pt;">for years 1, 5, 10 (as applicable) and since inception compared to those of a market index and a broad-based </span><span style="font-family:Arial;font-size:9.00pt;margin-left:0%;">securities </span><span style="font-family:Arial;font-size:9.00pt;">market index. </span>
Bar Chart [Heading]	<span style="font-family:Arial;font-size:9.90pt;font-weight:bold;">FT Energy Income Partners Enhanced Income ETF</span> <br/><span style="font-family:Arial;font-size:9.90pt;font-weight:bold;">Calendar Year Total Returns as of 12/31</span>
Bar Chart Closing [Text Block]	During the periods shown in the chart above:ReturnPeriod EndedBest Quarter20.91%June 30, 2020Worst Quarter-42.48%March 31, 2020
Performance Table Heading	<span style="font-family:Arial;font-size:9.90pt;font-weight:bold;">Average Annual Total Returns for the Periods Ended December 31, 2025</span>
Performance Table Uses Highest Federal Rate	<span style="color:#000000;font-family:Arial;font-size:9.00pt;margin-left:0%;">All after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state or local tax.</span>
Performance Table Not Relevant to Tax Deferred	<span style="color:#000000;font-family:Arial;font-size:9.00pt;margin-left:0%;">Your own actual after-tax returns will depend on your specific tax situation and may differ from what is shown here. After-tax returns are not relevant to investors who hold Fund shares in tax-deferred accounts such as individual retirement accounts </span><span style="color:#000000;font-family:Arial;font-size:9.00pt;">(</span><span style="color:#000000;font-family:Arial;font-size:9.00pt;font-style:italic;">IRAs</span><span style="color:#000000;font-family:Arial;font-size:9.00pt;">) or employee-sponsored retirement plans.</span>
Performance Table Explanation after Tax Higher	<span style="color:#000000;font-family:Arial;font-size:9.00pt;">Returns after taxes on distributions reflect the taxed return on the payment of dividends </span><span style="color:#000000;font-family:Arial;font-size:9.00pt;margin-left:0%;">and capital gains. Returns after taxes on distributions and sale of shares assume you sold your shares at period end, and, therefore, are also adjusted for any capital gains or losses incurred. Returns for an index do not include expenses, which are </span><span style="color:#000000;font-family:Arial;font-size:9.00pt;">deducted from Fund returns, or taxes.</span>
Performance Availability Website Address [Text]	<span style="font-family:Arial;font-size:9.00pt;">http://www.ftportfolios.com</span>
FT Energy Income Partners Enhanced Income ETF
Prospectus [Line Items]
Highest Quarterly Return, Label [Optional Text]	<span style="font-family:Arial;font-size:9.00pt;margin-left:0.0pt;">Best Quarter</span>
Highest Quarterly Return	20.91%
Highest Quarterly Return, Date	Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text]	<span style="font-family:Arial;font-size:9.00pt;margin-left:0.0pt;">Worst Quarter</span>
Lowest Quarterly Return	(42.48%)
Lowest Quarterly Return, Date	Mar. 31, 2020

FT Energy Income Partners Enhanced Income ETF Performance Management - FT Energy Income Partners Enhanced Income ETF

Nov. 30, 2025

Bar Chart and Performance Table [Heading]

Annual Total Return

Performance Narrative [Text Block]

On February 29, 2024, the shareholders of First Trust Energy Income and Growth Fund, First Trust MLP and Energy Income Fund, First Trust New Opportunities MLP & Energy Fund and First Trust Energy Infrastructure Fund, each a Massachusetts business trust that is registered as a closed-end management investment company (the “Target Funds”), approved an Agreement and Plan of Merger (the “Plan”) by and between the Target Funds, and the Trust, on behalf of the Fund, pursuant to which the Target Funds would (i) transfer all of their assets to the Fund in exchange solely for newly issued shares of the Fund and the Fund’s assumption of all of the liabilities of the Target Funds, and (ii) immediately distribute such newly issued shares of the Fund to shareholders of the Target Funds (the “Mergers”). As a result of the Mergers, the Fund has assumed the performance history of First Trust Energy Infrastructure Fund (the “Predecessor Fund”). As the Predecessor Fund and Fund have a number of differences, including investment policies and practices and that the Predecessor Fund is a closed-end fund which utilizes leverage while the Fund is an exchange-traded fund which does not utilize leverage, the Predecessor Fund’s past performance is not indicative of how the Fund will, or is expected to, perform in the future. Accordingly, any Fund performance and historical returns shown below that incorporates Predecessor Fund performance prior to May 6, 2024 is not indicative of the performance that the Fund would have generated.The bar chart and table below illustrate the annual calendar year returns of the Fund (having assumed the performance of the Predecessor Fund) based on net asset value as well as the average annual Fund returns. The bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance (having assumed the performance of the Predecessor Fund) from year-to-year and by showing how the Fund’s average annual total returns based on net asset value for years 1, 5, 10 (as applicable) and since inception compared to those of a market index and a broad-based securities market index. The Fund’s updated performance information is accessible on the Fund’s website at http://www.ftportfolios.com.

Performance Past Does Not Indicate Future [Text]

The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Performance Information Illustrates Variability of Returns [Text]

The bar chart and table below illustrate the annual calendar year returns of the Fund (having assumed the performance of the Predecessor Fund) based on net asset value as well as the average annual Fund returns. The bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance (having assumed the performance of the Predecessor Fund) from year-to-year and by showing how the Fund’s average annual total returns based on net asset value for years 1, 5, 10 (as applicable) and since inception compared to those of a market index and a broad-based securities market index.

Bar Chart [Heading]

FT Energy Income Partners Enhanced Income ETF Calendar Year Total Returns as of 12/31

Bar Chart Closing [Text Block]

During the periods shown in the chart above:ReturnPeriod EndedBest Quarter20.91%June 30, 2020Worst Quarter-42.48%March 31, 2020

Performance Table Heading

Average Annual Total Returns for the Periods Ended December 31, 2025

Performance Table Uses Highest Federal Rate

All after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state or local tax.

Performance Table Not Relevant to Tax Deferred

Your own actual after-tax returns will depend on your specific tax situation and may differ from what is shown here. After-tax returns are not relevant to investors who hold Fund shares in tax-deferred accounts such as individual retirement accounts (IRAs) or employee-sponsored retirement plans.

Performance Table Explanation after Tax Higher

Returns after taxes on distributions reflect the taxed return on the payment of dividends and capital gains. Returns after taxes on distributions and sale of shares assume you sold your shares at period end, and, therefore, are also adjusted for any capital gains or losses incurred. Returns for an index do not include expenses, which are deducted from Fund returns, or taxes.

Performance Availability Website Address [Text]

http://www.ftportfolios.com

FT Energy Income Partners Enhanced Income ETF

Prospectus [Line Items]

Highest Quarterly Return, Label [Optional Text]

Best Quarter

Highest Quarterly Return

20.91%

Highest Quarterly Return, Date

Jun. 30, 2020

Lowest Quarterly Return, Label [Optional Text]

Worst Quarter

Lowest Quarterly Return

(42.48%)

Lowest Quarterly Return, Date

Mar. 31, 2020