First Trust S-Network E-Commerce ETF Performance Management - First Trust S-Network E-Commerce ETF |
Mar. 31, 2025 |
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| 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] | The bar chart and table below illustrate the annual calendar year returns of the Fund based on net asset value as well as the average annual Fund and Index 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 from year-to-year and by showing how the Fund’s average annual total returns based on net asset value compared to those of the Index and a broad-based securities market index. The Nasdaq US Benchmark Retail Index is an index designed to provide exposure to U.S. companies comprising the retail sector. The Fund’s performance information is accessible on the Fund’s website at http://www.ftportfolios.com.On January 26, 2022, the Fund’s underlying index changed from the Nasdaq US Smart Retail Index to the S-Network Global E-Commerce IndexTM. Therefore, the Fund’s performance and historical returns shown below are not necessarily indicative of the performance that the Fund, based on the Index, would have generated. Returns for an index are only disclosed for those periods in which the index was in existence for the whole period. |
| 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 based on net asset value as well as the average annual Fund and Index returns. The bar chart and table </span><span style="font-family:Arial;font-size:9.00pt;">provide an indication of the risks of investing in the Fund by </span><span style="font-family:Arial;font-size:9.00pt;margin-left:0%;">showing changes in the Fund’s performance from year-to-year and by showing how the Fund’s average annual total returns based on net asset value compared to those of the Index and a broad-based </span><span style="font-family:Arial;font-size:9.00pt;">securities market index. The Nasdaq US Benchmark </span><span style="font-family:Arial;font-size:9.00pt;margin-left:0%;">Retail Index is an index designed to provide exposure to U.S. companies comprising the retail sector. </span> |
| Bar Chart [Heading] | <span style="font-family:Arial;font-size:9.90pt;font-weight:bold;">First Trust S-Network E-Commerce ETF</span> <br/><span style="font-family:Arial;font-size:9.90pt;font-weight:bold;">Calendar Year Total Returns as of 12/31 </span><span style="font-family:Arial;font-size:7pt;font-weight:bold;position:relative;top:-3.25pt;">(1)</span> |
| Bar Chart Footnotes [Text Block] | (1)The Fund's calendar year-to-date total return based on net asset value for the period 12/31/24 to 06/30/25 was 12.25%. |
| Bar Chart Closing [Text Block] | During the periods shown in the chart above:ReturnPeriod EndedBest Quarter30.45%June 30, 2020Worst Quarter-26.74%March 31, 2020Year-to-Date12.25%June 30, 2025 |
| 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, 2024</span> |
| Performance Table Market Index Changed | <span style="font-family:Arial;font-size:8.10pt;font-style:italic;">On January 26, 2022, the Fund’s underlying index changed from the Nasdaq US Smart Retail</span><span style="font-family:Arial;font-size:5.5pt;font-style:italic;position:relative;top:-2.75pt;">TM</span><span style="font-family:Arial;font-size:8.10pt;font-style:italic;"> Index to the S-Network Global E-Commerce Index</span><span style="font-family:Arial;font-size:5.5pt;font-style:italic;position:relative;top:-2.75pt;">TM</span><span style="font-family:Arial;font-size:8.10pt;font-style:italic;">. Therefore, performance and historical returns shown for the periods prior to January 26, 2022, are not necessarily indicative of the performance that the Fund, based on its current Index, would have generated.</span> |
| Performance Table Uses Highest Federal Rate | <span style="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="font-family:Arial;font-size:9.00pt;">Returns after taxes on distributions reflect the taxed return on the payment of dividends </span><span style="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 </span><span style="font-family:Arial;font-size:9.00pt;">an index do not include expenses, which are 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> |
| First Trust S-Network E-Commerce ETF | |
| Prospectus [Line Items] | |
| Year to Date Return, Label [Optional Text] | <span style="font-family:Arial;font-size:9.00pt;margin-left:0.0pt;">Year-to-Date</span> |
| Bar Chart, Year to Date Return | 12.25% |
| Bar Chart, Year to Date Return, Date | Jun. 30, 2025 |
| 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 | 30.45% |
| 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 | (26.74%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |