Shareholder Report |
12 Months Ended | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Nov. 30, 2025
USD ($)
Holding
| ||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||
| Document Type | N-CSR | |||||||||||||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||||||||||||
| Registrant Name | First Trust Exchange-Traded Fund VIII | |||||||||||||||||||||||||||||||
| Entity Central Index Key | 0001667919 | |||||||||||||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||||||||||||
| Document Period End Date | Nov. 30, 2025 | |||||||||||||||||||||||||||||||
| C000243906 [Member] | ||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||
| Fund Name | First Trust Active Global Quality Income ETF | |||||||||||||||||||||||||||||||
| Class Name | First Trust Active Global Quality Income ETF | |||||||||||||||||||||||||||||||
| Trading Symbol | AGQI | |||||||||||||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the First Trust Active Global Quality Income ETF (the “Fund”) for the year of December 1, 2024 to November 30, 2025 (the “Period”). | |||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/AGQI. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com. | |||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during or after the reporting period.
|
|||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-621-1675 | |||||||||||||||||||||||||||||||
| Additional Information Email | info@ftportfolios.com | |||||||||||||||||||||||||||||||
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/AGQI | |||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment)
|
|||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 47 | |||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.43% | [1] | ||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes payment received from insurance during the fiscal year ended November 30, 2025 related to extraordinary legal fees paid by the Fund during the fiscal year ended November 30, 2024 and the fiscal period ended November 30, 2023. If the insurance payment had not been received, the expense ratio would have been 0.85%. | |||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 0.85% | |||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 19.52% for the 12 months ended November 30, 2025. The Fund outperformed its benchmark, the MSCI ACWI High Dividend Yield Index, which returned 13.59% for the same Period. Key contributors to the Fund’s performance during the Period were:
Key detractors from the Fund’s performance during the Period were:
|
|||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (November 30, 2015 to November 30, 2025) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000 |
|||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
|
|||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||
| Material Change Date | Nov. 30, 2025 | |||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit www.ftportfolios.com/etf/AGQI for more recent performance information.
|
|||||||||||||||||||||||||||||||
| Net Assets | $ 57,075,888 | |||||||||||||||||||||||||||||||
| Holdings Count | Holding | 33 | |||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 475,118 | |||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 64.00% | |||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (As of November 30, 2025)
|
|||||||||||||||||||||||||||||||
| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (As of November 30, 2025) The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund. Top Ten Holdings
Sector Allocation |
|||||||||||||||||||||||||||||||
| Largest Holdings [Text Block] | Top Ten Holdings
|
|||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND MATERIALLY CHANGED? This is a summary of certain changes to the Fund since December 1, 2024. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/AGQI or upon request at 1-800-621-1675 or info@ftportfolios.com. The Fund’s net expense ratio for the fiscal year ended November 30, 2025 was 0.43% of the Fund's average daily net assets, a decrease from a net expense ratio for the fiscal year ended November 30, 2024 of 2.27% of the Fund’s average daily net assets. This ratio reflects a payment received from insurance during the fiscal year ended November 30, 2025 related to extraordinary legal fees paid by the Fund during the fiscal year ended November 30, 2024 and the fiscal period ended November 30, 2023.
|
|||||||||||||||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The Fund’s net expense ratio for the fiscal year ended November 30, 2025 was 0.43% of the Fund's average daily net assets, a decrease from a net expense ratio for the fiscal year ended November 30, 2024 of 2.27% of the Fund’s average daily net assets. This ratio reflects a payment received from insurance during the fiscal year ended November 30, 2025 related to extraordinary legal fees paid by the Fund during the fiscal year ended November 30, 2024 and the fiscal period ended November 30, 2023.
|
|||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since December 1, 2024. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/AGQI or upon request at 1-800-621-1675 or info@ftportfolios.com.
|
|||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-621-1675 | |||||||||||||||||||||||||||||||
| Updated Prospectus Email Address | info@ftportfolios.com | |||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/AGQI | |||||||||||||||||||||||||||||||
| C000247844 [Member] | ||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||
| Fund Name | FT Energy Income Partners Enhanced Income ETF | |||||||||||||||||||||||||||||||
| Class Name | FT Energy Income Partners Enhanced Income ETF | |||||||||||||||||||||||||||||||
| Trading Symbol | EIPI | |||||||||||||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the FT Energy Income Partners Enhanced Income ETF (the “Fund”) for the year of December 1, 2024 to November 30, 2025 (the “Period”). | |||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/EIPI. 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/EIPI | |||||||||||||||||||||||||||||||
| Expenses [Text Block] |
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
|
|||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 117 | |||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.13% | [2] | ||||||||||||||||||||||||||||||
| Extraordinary Expenses Footnote [Text Block] | Includes extraordinary expenses. If these extraordinary expenses were not included, the expense ratio would have been 1.10%. | |||||||||||||||||||||||||||||||
| Expenses Excluding Extraordinary Expenses, Percent | 1.10% | |||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned 6.39% for the 12 months ended November 30, 2025. The Fund outperformed its benchmark, the S&P Global 1200 Energy Index, which returned 6.25% for the same Period.
This outperformance was attributable to overweight positions in natural gas pipeline companies, pipeline master limited partnerships, and electric utilities that outperformed the benchmark and were either underweight or were not included in the benchmark. These companies, in the opinion of the Fund’s sub-advisor, Energy Income Partners, LLC, are well positioned to benefit from growing electricity demand and the need for more natural gas generation, along with increasing liquefied natural gas export capacity. Underweight positions in various cyclical energy companies relative to the benchmark also contributed to the Fund’s relative performance. The Fund tends to be overweight in companies that have more stable and growing earnings such as pipeline and utility companies relative to the benchmark, while the benchmark tends to be overweight in cyclical energy companies such as oil and gas producers and international oil companies.
The Fund posted positive returns for the Period as dividend income and earnings growth of natural gas pipeline companies, pipeline master limited partnerships and electric utilities offset the Fund’s exposure to some liquids pipeline and renewable companies. Selling covered calls had a negative impact on the performance of the Fund which was partially offset by the premiums collected over the Period.
Top Contributors:
Top Detractors:
|
|||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (November 30, 2015 to November 30, 2025) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000
|
|||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
|
|||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] |
Visit www.ftportfolios.com/etf/EIPI for more recent performance information.
|
|||||||||||||||||||||||||||||||
| Net Assets | $ 967,974,853 | |||||||||||||||||||||||||||||||
| Holdings Count | Holding | 125 | |||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 10,165,815 | |||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 103.00% | |||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (As of November 30, 2025)
|
|||||||||||||||||||||||||||||||
| Holdings [Text Block] |
WHAT DID THE FUND INVEST IN? (As of November 30, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Sector Allocation
|
|||||||||||||||||||||||||||||||
| Largest Holdings [Text Block] |
Top Ten Holdings
|
|||||||||||||||||||||||||||||||
| C000257285 [Member] | ||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||
| Fund Name | FT Confluence BDC & Specialty Finance Income ETF | |||||||||||||||||||||||||||||||
| Class Name | FT Confluence BDC & Specialty Finance Income ETF | |||||||||||||||||||||||||||||||
| Trading Symbol | FBDC | |||||||||||||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the FT Confluence BDC & Specialty Finance Income ETF (the “Fund”) for the year of December 1, 2024 to November 30, 2025 (the “Period”). | |||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.ftportfolios.com/fund-documents/etf/FBDC. You can also request this information by contacting us at 1-800-621-1675 or info@ftportfolios.com. | |||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during or after the reporting period.
|
|||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-800-621-1675 | |||||||||||||||||||||||||||||||
| Additional Information Email | info@ftportfolios.com | |||||||||||||||||||||||||||||||
| Additional Information Website | www.ftportfolios.com/fund-documents/etf/FBDC | |||||||||||||||||||||||||||||||
| Expenses [Text Block] |
WHAT WERE THE FUND COSTS FOR THE LAST YEAR?
(Based on a hypothetical $10,000 investment)
|
|||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 222 | [3],[4] | ||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 2.25% | [3],[4] | ||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
HOW DID THE FUND PERFORM LAST YEAR? WHAT AFFECTED THE FUND’S PERFORMANCE?
The Fund returned -2.61% for the fiscal year ended November 30, 2025. Performance prior to June 30, 2025 is for FGB. The Fund outperformed its benchmark, the MarketVector™ US Business Development Companies Liquid Index, which returned -3.16% for the same Period.
This outperformance was in part derived from higher relative exposure to certain internally managed business development companies (“BDCs”) that delivered higher returns and lower relative allocations to certain large index constituents that underperformed during the Period.
The following key factors affected the Fund’s performance during the Period:
Regardless of market conditions, we believe monitoring risk should be a continuous effort. One of the most helpful ways to address BDC investment risk is to actively focus on experienced managers employing high-quality underwriting, with long track records of delivering attractive risk-adjusted returns. Also important are BDC capital allocation policies, fee levels, and the alignment of incentives alongside those of shareholders. Looking forward, we believe the environment for BDCs is fairly well balanced. On one side, BDCs are likely to face downward pressure on profitability as short-term rates decline; however, on the other side, BDC loan portfolios may benefit from a credit quality uplift as their borrowers experience declining interest expense burdens.
Through active portfolio management, we believe investors can benefit from exposure to BDCs with the breadth and depth in their business models to deliver attractive returns, regardless of where interest rates go.
BDCs provide a unique and liquid way to gain exposure to private credit with a high level of current income. We believe the Fund is well positioned to deliver the utility of this alternative asset class and that active management can help improve risk-adjusted returns.
|
|||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | FUND PERFORMANCE (November 30, 2015 to November 30, 2025) The performance line graph below shows the performance of a hypothetical $10,000 initial investment in the Fund over a ten-year period (or for the life of the Fund, if shorter). The subsequent account value as of the end of the Period is listed next to the name of the Fund or index, as applicable. The performance table below shows the average annual total returns of the Fund for the past one-, five-, and ten-year periods, as applicable (or for the life of the Fund, if shorter), as of the end of the Period. Both the line graph and performance table compare the Fund’s performance to an appropriate broad-based index and may compare to additional indices reflecting the market segment(s) in which the Fund invests over the same periods. Investment Performance of $10,000
|
|||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
|
|||||||||||||||||||||||||||||||
| Performance Inception Date | May 25, 2007 | |||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||||||||||||
| Material Change Date | Nov. 30, 2025 | |||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] |
Visit www.ftportfolios.com/etf/FBDC for more recent performance information.
|
|||||||||||||||||||||||||||||||
| Net Assets | $ 39,272,281 | |||||||||||||||||||||||||||||||
| Holdings Count | Holding | 22 | |||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 576,206 | |||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 28.00% | |||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (As of November 30, 2025)
|
|||||||||||||||||||||||||||||||
| Holdings [Text Block] |
WHAT DID THE FUND INVEST IN? (As of November 30, 2025)
The tables below show the investment makeup of the Fund, representing the percentage of total investments of the Fund.
Top Ten Holdings
Industry Allocation
|
|||||||||||||||||||||||||||||||
| Largest Holdings [Text Block] | Top Ten Holdings
|
|||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
HOW HAS THE FUND MATERIALLY CHANGED?
This is a summary of certain changes to the Fund since its reorganization on June 30, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FBDC or upon request at 1-800-621-1675 or info@ftportfolios.com.
The Fund’s expense ratio for the fiscal year ended November 30, 2025 was 2.25% of the Fund’s average daily net assets, a decrease from the expense ratio for the fiscal year ended November 30, 2024 of 2.62% of the Fund’s average daily net assets. The expense ratio includes costs from FGB for the period November 1, 2024 to June 30, 2025. After FGB reorganized into the Fund, the Fund began charging an annual unitary management fee of 0.95%.
|
|||||||||||||||||||||||||||||||
| Material Fund Change Expenses [Text Block] | The Fund’s expense ratio for the fiscal year ended November 30, 2025 was 2.25% of the Fund’s average daily net assets, a decrease from the expense ratio for the fiscal year ended November 30, 2024 of 2.62% of the Fund’s average daily net assets. The expense ratio includes costs from FGB for the period November 1, 2024 to June 30, 2025. After FGB reorganized into the Fund, the Fund began charging an annual unitary management fee of 0.95%.
|
|||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] |
This is a summary of certain changes to the Fund since its reorganization on June 30, 2025. For more complete information, you may review the Fund’s prospectus and any applicable supplements at www.ftportfolios.com/fund-documents/etf/FBDC or upon request at 1-800-621-1675 or info@ftportfolios.com.
|
|||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-621-1675 | |||||||||||||||||||||||||||||||
| Updated Prospectus Email Address | info@ftportfolios.com | |||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | www.ftportfolios.com/fund-documents/etf/FBDC | |||||||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||||