Investment Risks - FT Vest Laddered U.S. Equity Uncapped Accelerator ETF |
Mar. 27, 2026 |
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| Prospectus [Line Items] | |
| Risk [Text Block] | ACCELERATED RETURN RISK. There can be no guarantee that an Underlying ETF will be successful in its strategy to provide the Upside Rate of Return during market conditions where SPY is increasing in value. While the Fund is designed to provide investors with the ability to participate in the accelerated returns of the Underlying ETFs, the Fund may realize returns that differ from, and may be less than, the full Upside Rate of Return associated with holding an Underlying ETF through the entire Target Outcome Period. It is anticipated that the Fund will benefit from some level of accelerated return, but the actual accelerated return realized by the Fund will depend on multiple factors including the performance of the Underlying ETF and the specific timing of the Fund's purchases and sales of Underlying ETF shares. Additionally, if SPY does not increase in value above the Target Upside Deductible and remains above the Target Upside at the end of a Target Outcome Period, the Underlying ETF will not provide investors, like the Fund, with the intended accelerated returns. In the event an investor purchases shares after the first day of a Target Outcome Period or sells shares prior to the end of a Target Outcome Period, the rate of return that the Underlying ETF seeks to provide will likely not be available. In the event an investor sells shares prior to the end of a Target Outcome Period, the investor may not receive the intended accelerated return even if the Underlying ETF’s performance has exceeded the Target Upside Deductible at the time of sale. This is because the Upside Rate of Return will only be fully realized if shares of the Underlying ETF are held until the end of the Target Outcome Period and SPY increases in value above the Target Upside Deductible at the end of the Target Outcome Period. If SPY increases above the Target Upside Deductible during a Target Outcome Period but falls below the Target Upside Deductible by the end of the Target Outcome Period, the Underlying ETF will likely not experience the intended accelerated returns. Accordingly, if an investor, like the Fund, disposes of shares prior to the end of a Target Outcome Period, the Fund may not benefit from the intended accelerated returns that the Underlying ETF would otherwise seek to provide, regardless of the Underlying ETF’s value relative to the Target Upside Deductible at the time of sale. An investor, like the Fund, that holds shares through multiple Target Outcome Periods may fail to experience gains comparable to those of SPY over time because investors will not participate in the positive price returns of SPY in a Target Outcome Period if SPY does not appreciate to a level above the Target Upside Deductible. This may also make it difficult to recoup any losses from prior Target Outcome Periods. The Upside Rate of Return will only be realized if SPY increases in value above the Target Upside Deductible at the end of a Target Outcome Period. If SPY increases above the Target Upside Deductible during a Target Outcome Period but fails to remain above the Target Upside Deductible at the end of a Target Outcome Period, the Underlying ETF will not experience any accelerated returns. Because any positive returns will not commence until the Target Upside Deductible is achieved, the Upside Rate of Return that the Fund may receive above the Target Upside Deductible may be less than an investment in a fund that does not have a Target Upside Deductible or Upside Rate of Return. If the Fund purchases Shares after a Target Outcome Period has begun and the Underlying ETF has risen in value to a level above the Target Upside Deductible, the Fund may experience more losses than SPY experiences. The Underlying ETF seeks to provide outcomes for an entire Target Outcome Period and does not seek to provide outcomes on a daily or other short-term basis, which is an attribute of other types of exchange-traded funds that provide a daily, multiple exposure to a reference index (i.e., a “daily leveraged ETF”). The value of the FLEX Options held by the Underlying ETF is ultimately derived from the price performance of SPY for the entire Target Outcome Period. As a result, it is very unlikely that, on any given day during which SPY share price increases in value, the Underlying ETF’s share price will increase at the same rate as the rate of return sought by the Underlying ETF (i.e., the Upside Rate of Return), which is designed for an entire Target Outcome Period. Additionally, because of the way the FLEX Options are structured there are certain time periods where the value of the Underlying ETF may fall faster than the value of SPY. For example, this could occur if the value of SPY has risen since the first day of a Target Outcome Period then falls back to its value on the first day of a Target Outcome Period.The returns with respect to the Underlying ETF for a Target Outcome Period may be lower than the price return of SPY or an investment in a fund that does not utilize a Target Upside Deductible or an Upside Rate of Return. This is because the Underlying ETF will forgo any positive returns unless the Target Upside Deductible is surpassed at the end of a Target Outcome Period. In this regard, the price return of SPY may need to materially exceed the Target Upside Deductible before the Underlying ETF recoups these forgone returns with an Upside Rate of Return. The returns that an investor like the Fund receives may therefore be less than the price return of SPY even if the Target Upside Deductible is exceeded at the end of a Target Outcome Period. If SPY’s share price increases in value above the Target Upside Deductible and remains above the Target Upside Deductible at the end of a Target Outcome Period, the Underlying ETF seeks to provide for an increase in value at a higher rate than the share price increase experienced by SPY. Likewise, there are situations during a Target Outcome Period in which the Underlying ETF may decrease in value at a higher rate than an associated decrease in SPY. If the Upside Rate of Return is experienced during a Target Outcome Period, the Underlying ETF may be subject to the possibility of losses that exceed the losses of SPY for the remainder of a Target Outcome Period. |
| Absence Of An Active Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ABSENCE OF AN ACTIVE MARKET RISK. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares due to a limited number of market makers or authorized participants. The Fund may rely on a small number of third-party market makers to provide a market for the purchase and sale of shares and market makers are under no obligation to make a market in the Fund’s shares. Additionally, only a limited number of institutions act as authorized participants for the Fund and only an authorized participant may engage in creation or redemption transactions directly with the Fund and are not obligated to submit purchase or redemption orders for Creation Units. Decisions by market makers or authorized participants to reduce their role or step away from these activities in times of market stress could inhibit the effectiveness of the arbitrage process in maintaining the relationship between the underlying values of the Fund’s portfolio securities and the Fund’s market price. Any trading halt or other problem relating to the trading activity of these market makers or any issues disrupting the authorized participants’ ability to proceed with creation and/or redemption orders could result in a dramatic change in the spread between the Fund’s net asset value and the price at which the Fund’s shares are trading on the Exchange, which could result in a decrease in value of the Fund’s shares. This reduced effectiveness could result in Fund shares trading at a premium or discount to net asset value and also in greater than normal intraday bid-ask spreads for Fund shares. |
| Concentrated Investment Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CONCENTRATED INVESTMENT RISK. The Fund will invest a significant percentage of its assets in a small number of ETFs. In addition to subjecting the Fund to the risks of investing in such ETFs as described in this prospectus, this subjects the Fund to the risk that a decline in the value of one or more ETFs could have a significant negative impact on the Fund's net asset value and your investment. In addition, the overall performance of the Fund will be largely dependent on the performance of this small number of ETFs, and if any of those ETFs experiences negative performance or fails to achieve its investment objective, the Fund and your investment could be significantly negatively impacted. Additionally, if the Fund owns a significant percentage of the outstanding shares of an ETF, large purchases and sales of the ETF's shares by the Fund may create a number of risks for the ETF and its shareholders (including the Fund), including impacts to the ETF's size, market price, liquidity, bid/ask spreads, portfolio turnover and transaction costs, tax efficiency and ability to trade underlying securities advantageously. These risks may be exacerbated for newer ETFs. |
| Conflict Of Interest Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CONFLICT OF INTEREST RISK. The Fund invests in other ETFs that are also advised by, or are otherwise affiliated with, the Advisor. Because the Fund pays management fees in connection with its investments in other ETFs, the Advisor has a financial incentive to cause the Fund to invest in ETFs for which it also serves as investment advisor. The Advisor may invest in an affiliated ETF even in circumstances where an unaffiliated ETF may have lower fees or better performance over certain time periods. |
| Counterparty Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | COUNTERPARTY RISK. Underlying ETF transactions involving a counterparty are subject to the risk that the counterparty will not fulfill its obligation to the Underlying ETF. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. An Underlying ETF may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed. The OCC acts as guarantor and central counterparty with respect to the FLEX Options. As a result, the ability of an Underlying ETF to meet its objective depends on the OCC being able to meet its obligations. In the unlikely event that the OCC becomes insolvent or is otherwise unable to meet its settlement obligations, an Underlying ETF and, in turn, the Fund could suffer significant losses. |
| Current Market Conditions Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CURRENT MARKET CONDITIONS RISK. Current market conditions risk is the risk that a particular investment, or shares of the Fund in general, may fall in value due to current market conditions. As a means to fight inflation, the Federal Reserve and certain foreign central banks have raised interest rates; however, the Federal Reserve has begun to lower interest rates and may continue to do so. U.S. regulators have proposed several changes to market and issuer regulations which would directly impact the Fund, and any regulatory changes could adversely impact the Fund’s ability to achieve its investment strategies or make certain investments. Potential future bank failures could result in disruption to the broader banking industry or markets generally and reduce confidence in financial institutions and the economy as a whole, which may also heighten market volatility and reduce liquidity. Additionally, challenges in commercial real estate markets, including high interest rates, declining valuations and elevated vacancies, could have a broader impact on financial markets. The ongoing adversarial political climate in the United States, as well as political and diplomatic events both domestic and abroad, have and may continue to have an adverse impact the U.S. regulatory landscape, markets and investor behavior, which could have a negative impact on the Fund’s investments and operations. The change in administration resulting from the 2024 United States national elections could result in significant impacts to international trade relations, tax and immigration policies, and other aspects of the national and international political and financial landscape, which could affect, among other things, inflation and the securities markets generally. Other unexpected political, regulatory and diplomatic events within the U.S. and abroad may affect investor and consumer confidence and may adversely impact financial markets and the broader economy. For example, ongoing armed conflicts between Russia and Ukraine in Europe and among Israel, Iran, Hamas and other militant groups in the Middle East, have caused and could continue to cause significant market disruptions and volatility within the markets in Russia, Europe, the Middle East and the United States. The hostilities and sanctions resulting from those hostilities have and could continue to have a significant impact on certain Fund investments as well as Fund performance and liquidity. The economies of the United States and its trading partners, as well as the financial markets generally, may be adversely impacted by trade disputes, including the imposition of tariffs, and other matters. For example, the United States has imposed trade barriers and restrictions on China. In addition, the Chinese government is engaged in a longstanding dispute with Taiwan, continually threatening an invasion. If the political climate between the United States and China does not improve or continues to deteriorate, if China were to attempt invading Taiwan, or if other geopolitical conflicts develop or worsen, economies, markets and individual securities may be adversely affected, and the value of the Fund’s assets may go down. A public health crisis and the ensuing policies enacted by governments and central banks may cause significant volatility and uncertainty in global financial markets, negatively impacting global growth prospects. As the COVID-19 global pandemic illustrated, such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Advancements in technology may also adversely impact markets and the overall performance of the Fund. For instance, the economy may be significantly impacted by the advanced development and increased regulation of artificial intelligence. Additionally, cyber security breaches of both government and non-government entities could have negative impacts on infrastructure and the ability of such entities, including the Fund, to operate properly. These events, and any other future events, may adversely affect the prices and liquidity of the Fund’s portfolio investments and could result in disruptions in the trading markets. |
| Cyber Security Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | CYBER SECURITY RISK. The Fund is susceptible to operational, information security and related risks through breaches in cyber security. A breach in cyber security refers to both intentional and unintentional events that may cause the Fund to lose proprietary information, suffer data corruption or lose operational capacity, any of which could result in a material adverse effect on the Fund or its shareholders. Such events could cause the Fund to incur regulatory penalties, reputational damage, additional compliance costs associated with corrective measures and/or financial loss. Cyber security breaches may involve unauthorized access to the Fund’s digital information systems through “hacking” or malicious software coding but may also result from outside attacks such as denial-of-service attacks through efforts to make network services unavailable to intended users. Emerging threats like ransomware or zero-day exploits could also cause disruptions to Fund operations. In addition, cyber security breaches of the issuers of securities in which the Fund invests or the Fund’s third-party service providers, such as its administrator, transfer agent, custodian, or sub-advisor, as applicable, among many other third-party service providers, can also subject the Fund to many of the same risks associated with direct cyber security breaches. Further, errors, misconduct, or compromise of accounts of employees of the Fund or its third-party service providers can also create material cybersecurity risks. Although the Fund has established risk management systems designed to reduce the risks associated with cyber security, there is no guarantee that such efforts will succeed, especially because the Fund does not directly control the cyber security systems of issuers or third-party service providers. Cyber security incidents may also trigger Fund obligations under data privacy laws, potentially increasing notification and compliance burdens. Cyber security incidents affecting issuers in whose securities the Fund invests may also have a negative impact on the value of the securities of such issuers, and in turn, the value of the Fund. |
| Flex Options Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | FLEX OPTIONS RISK. The Underlying ETFs invest in FLEX Options. Trading FLEX Options involves risks different from, or possibly greater than, the risks associated with investing directly in securities. The Underlying ETFs may experience substantial downside from specific FLEX Option positions and certain FLEX Option positions may expire worthless. The FLEX Options are listed on an exchange; however, no one can guarantee that a liquid secondary trading market will exist for the FLEX Options. In the event that trading in the FLEX Options is limited or absent, the value of the Underlying ETFs' FLEX Options may decrease. In a less liquid market for the FLEX Options, liquidating the FLEX Options may require the payment of a premium (for written FLEX Options) or acceptance of a discounted price (for purchased FLEX Options) and may take longer to complete. A less liquid trading market may adversely impact the value of the FLEX Options and Underlying ETFs’ shares and result in the Underlying ETFs and, in turn, the Fund being unable to achieve their investment objective. Less liquidity in the trading of the Underlying ETF’s FLEX Options could have an impact on the prices paid or received by the Underlying ETFs for the FLEX Options in connection with creations and redemptions of the Underlying ETF’s shares. Depending on the nature of this impact to pricing, an Underlying ETF may be forced to pay more for redemptions (or receive less for creations) than the price at which it currently values the FLEX Options. Such overpayment or under collection may impact the value of the Underlying ETF and whether the Underlying ETF can satisfy its investment objective. Additionally, in a less liquid market for the FLEX Options, the liquidation of a large number of options may more significantly impact the price. A less liquid trading market may adversely impact the value of the FLEX Options and the value of the Underlying ETFs. The trading in FLEX Options may be less deep and liquid than the market for certain other exchange-traded options, non-customized options or other securities. |
| Flex Options Valuation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | FLEX OPTIONS VALUATION RISK. The FLEX Options held by the Underlying ETFs will be exercisable at the strike price only on their expiration date. Prior to the expiration date, the value of the FLEX Options will be determined based upon market quotations or using other recognized pricing methods. The FLEX Options are also subject to correlation risk, meaning the value of the FLEX Options does not increase or decrease at the same rate as SPY (although they generally move in the same direction) or its underlying securities. The value of the FLEX Options prior to the expiration date may vary because of factors other than the value of SPY, such as interest rate changes, changing supply and demand, decreased liquidity of the FLEX Options, a change in the actual and perceived volatility of the stock market and SPY and the remaining time to expiration. FLEX Option prices may also be highly volatile and may fluctuate substantially during a short period of time. During periods of reduced market liquidity or in the absence of readily available market quotations for the holdings of the Underlying ETFs, the ability of the Underlying ETFs to value the FLEX Options becomes more difficult and the judgment of the Underlying ETFs' investment adviser (employing the fair value procedures approved by the Board of Trustees of the Trust) may play a greater role in the valuation of the Underlying ETFs' holdings due to reduced availability of reliable objective pricing data. Consequently, while such determinations may be made in good faith, it may nevertheless be more difficult for the Underlying ETFs to accurately assign a daily value. Under those circumstances, the value of the FLEX Options will require more reliance on the investment adviser’s judgment than that required for securities for which there is an active trading market. This creates a risk of mispricing or improper valuation of the FLEX Options which could impact the value paid for shares of the Underlying ETFs. |
| Index Or Model Constituent Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | INDEX OR MODEL CONSTITUENT RISK. The Fund may be a constituent of one or more indices or ETF models. As a result, the Fund may be included in one or more index-tracking exchange-traded funds or mutual funds. Being a component security of such a vehicle could greatly affect the trading activity involving the Fund’s shares, the size of the Fund and the market volatility of the Fund. Inclusion in an index could increase demand for the Fund and removal from an index could result in outsized selling activity in a relatively short period of time. As a result, the Fund’s net asset value could be negatively impacted and the Fund’s market price may be below the Fund’s net asset value during certain periods. In addition, index rebalances may potentially result in increased trading activity in the Fund's shares. |
| Information Technology Companies Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | INFORMATION TECHNOLOGY COMPANIES RISK. SPY invests significantly in information technology companies. Information technology companies produce and provide hardware, software and information technology systems and services. These companies may be adversely affected by rapidly changing technologies, short product life cycles, fierce competition, aggressive pricing and reduced profit margins, the loss of patent, copyright and trademark protections, cyclical market patterns, evolving industry standards and frequent new product introductions. In addition, information technology companies are particularly vulnerable to federal, state and local government regulation, and competition and consolidation, both domestically and internationally, including competition from foreign competitors with lower production costs. Information technology companies also heavily rely on intellectual property rights and may be adversely affected by the loss or impairment of those rights. |
| Large Capitalization Companies Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | LARGE CAPITALIZATION COMPANIES RISK. SPY invests in the securities of large capitalization companies. Large capitalization companies may grow at a slower rate and be less able to adapt to changing market conditions than smaller capitalization companies. Thus, the return on investment in securities of large capitalization companies may be less than the return on investment in securities of small and/or mid capitalization companies. The performance of large capitalization companies also tends to trail the overall market during different market cycles. |
| Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | MANAGEMENT RISK. The Fund is subject to management risk because it is an actively managed portfolio. In managing the Fund’s investment portfolio, the portfolio managers will apply investment techniques and risk analyses, including through the use of technology, automated processes, algorithms, or other management systems, that may not operate as intended or produce the desired result. There can be no guarantee that the Fund will meet its investment objective. |
| Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | MARKET RISK. Market risk is the risk that a particular investment, or shares of the Fund in general, may fall in value. Securities are subject to market fluctuations caused by real or perceived adverse economic, political, and regulatory factors or market developments, changes in interest rates and perceived trends in securities prices. Shares of the Fund could decline in value or underperform other investments. In addition, local, regional or global events such as war, acts of terrorism, market manipulation, government defaults, government shutdowns, regulatory actions, political changes, diplomatic developments, the imposition of sanctions and other similar measures, spread of infectious diseases or other public health issues, recessions, natural disasters, or other events could have a significant negative impact on the Fund and its investments. Any of such circumstances could have a materially negative impact on the value of the Fund’s shares, the liquidity of an investment, and may result in increased market volatility. During any such events, the Fund’s shares may trade at increased premiums or discounts to their net asset value, the bid/ask spread on the Fund’s shares may widen and the returns on investment may fluctuate. |
| New Fund Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | NEW FUND RISK. The Fund is new and has no performance history or assets as of the date of this prospectus. The Fund expects to have fewer assets than larger funds. Like other new funds, large inflows and outflows may impact the Fund’s market exposure, and in turn, the Fund’s returns for limited periods of time. |
| Risk Nondiversified [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | NON-DIVERSIFICATION RISK. The Fund is classified as “non-diversified” under the 1940 Act. As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly invested in certain issuers. |
| Operational Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | OPERATIONAL RISK. The Fund is subject to risks arising from various operational factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or systems failures. These errors or failures may adversely affect the Fund’s operations, including its ability to execute its investment process, calculate or disseminate its NAV or intraday indicative optimized portfolio value in a timely manner, and process creations or redemptions. The Fund relies on third-parties for a range of services, including custody, valuation, administration, transfer services, securities lending and accounting, among many others. Any delay or failure relating to engaging or maintaining such service providers may affect the Fund’s ability to meet its investment objective. Although the Fund and the Fund's investment advisor seek to reduce these operational risks through controls and procedures, there is no way to completely protect against such risks. |
| Options Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | OPTIONS RISK. The use of options involves investment strategies and risks different from those associated with ordinary portfolio securities transactions and depends on the ability of the Underlying ETFs' portfolio managers to forecast market movements correctly. The prices of options are volatile and are influenced by, among other things, actual and anticipated changes in the value of the underlying instrument, or in interest or currency exchange rates, including the anticipated volatility, which in turn are affected by fiscal and monetary policies and by national and international political and economic events. The effective use of options also depends on the Underlying ETFs' ability to terminate option positions at times deemed desirable to do so. There is no assurance that the Underlying ETFs will be able to effect closing transactions at any particular time or at an acceptable price. In addition, there may at times be an imperfect correlation between the movement in values of options and their underlying securities and there may at times not be a liquid secondary market for certain options. |
| Portfolio Turnover Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | PORTFOLIO TURNOVER RISK. High portfolio turnover may result in the Fund paying higher levels of transaction costs and may generate greater tax liabilities for shareholders. Portfolio turnover risk may cause the Fund’s performance to be less than expected. |
| Premium Discount Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | PREMIUM/DISCOUNT RISK. The market price of the Fund’s shares will generally fluctuate in accordance with changes in the Fund’s net asset value as well as the relative supply of and demand for shares on the Exchange. The Fund’s investment advisor cannot predict whether shares will trade below, at or above their net asset value because the shares trade on the Exchange at market prices and not at net asset value. Price differences may be due, in large part, to the fact that supply and demand forces at work in the secondary trading market for shares will be closely related, but not identical, to the same forces influencing the prices of the holdings of the Fund trading individually or in the aggregate at any point in time. However, given that shares can only be purchased and redeemed in Creation Units, and only to and from broker-dealers and large institutional investors that have entered into participation agreements (unlike shares of closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their net asset value), the Fund’s investment advisor believes that large discounts or premiums to the net asset value of shares should not be sustained. During stressed market conditions, the market for the Fund’s shares may become less liquid in response to deteriorating liquidity in the market for the Fund’s underlying portfolio holdings, which could in turn lead to differences between the market price of the Fund’s shares and their net asset value and the bid/ask spread on the Fund’s shares may widen. |
| Significant Exposure Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | SIGNIFICANT EXPOSURE RISK. The Fund intends to generally rebalance its portfolio to equal weight quarterly. The Fund also will acquire and dispose of Underlying ETFs in connection with the creation and redemption of Creation Units between quarterly rebalances. These intra-quarter acquisitions and dispositions will reflect the composition of the Fund’s portfolio at the time of the acquisition or disposition. Accordingly, the weight of each Underlying ETF will likely have drifted away from the strict equal weight assigned to it at the prior Index rebalance. The Advisor does not seek to maintain equal weighting of the Underlying ETFs between quarterly rebalances. In between such rebalances, market movements in the prices of the Underlying ETFs may result in the Fund having temporary larger exposures to certain Underlying ETFs compared to others. Under such circumstances, the Fund’s returns would be more greatly influenced by the returns of the Underlying ETFs with the larger exposures. |
| SPY Equity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | SPY EQUITY RISK. Because each Underlying ETF holds FLEX Options that reference SPY, each Underlying ETF has exposure to the equity securities markets. Equity securities prices fluctuate for several reasons, including changes in investors’ perceptions of the financial condition of an issuer or the general condition of the relevant equity market, such as market volatility, or when political or economic events affecting an issuer occur. Common stock prices may be particularly sensitive to rising interest rates, as the cost of capital rises and borrowing costs increase. Equity securities may decline significantly in price over short or extended periods of time, and such declines may occur in the equity market as a whole, or they may occur in only a particular country, company, industry or sector of the market. |
| Spy Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | SPY RISK. Each Underlying ETF invests in FLEX Options that reference SPY, which subjects the Underlying ETFs to certain of the risks of owning shares of an ETF as well as the types of instruments in which SPY invests. The value of SPY will fluctuate over time based on fluctuations in the values of the securities held by SPY, which may be affected by changes in general economic conditions, expectations for future growth and profits, interest rates and the supply and demand for those securities. In addition, ETFs are subject to absence of an active market risk, premium/discount risk and trading issues risk. Brokerage, tax and other expenses may negatively impact the performance of the Underlying ETF and, in turn, the value of the Fund’s shares. An ETF that tracks an index may not exactly match the performance of the index due to cash drag, differences between the portfolio of the ETF and the components of the index, expenses and other factors. |
| Target Outcome Period Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | TARGET OUTCOME PERIOD RISK. Each Underlying ETF’s investment strategy is designed to deliver the potential for rates of return (before fees and expenses) that outperform the positive price return of SPY if SPY experiences at least 2.0% of positive returns at the end of the Target Outcome Period if shares are bought on the day on which the Underlying ETF enters into the FLEX Options (i.e., the first day of a Target Outcome Period) and held until those FLEX Options expire at the end of the Target Outcome Period. Because the Fund will acquire shares of the Underlying ETFs in connection with creations of new shares of the Fund and during each quarterly rebalance, the Fund typically will not acquire Underlying ETF shares on the first day of a Target Outcome Period. Likewise, the Fund will dispose of shares of the Underlying ETFs in connection with redemptions of shares of the Fund and during each quarterly rebalance, and such disposals typically will not occur on the last day of a Target Outcome Period. In the event the Fund acquires shares after the first day of a Target Outcome Period or disposes of shares prior to the expiration of the Target Outcome Period, the value of the Fund’s investment in Underlying ETF shares will likely not experience the outcomes that the Underlying ETF seeks to provide. |
| Tax Risk From Investment In Other Investment Companies [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | TAX RISK FROM INVESTMENT IN OTHER INVESTMENT COMPANIES. The Fund has based its analysis of its qualification as a “regulated investment company” (“RIC”) as defined by the Code on the belief that its portfolio funds are themselves RICs. If a portfolio fund were to lose its status as a RIC for purposes of the Code, the Fund may fail its requirement to have a diversified portfolio, and, thus, lose its own RIC status. If the Fund did not qualify as a RIC for any taxable year and certain relief provisions were not available, the Fund’s taxable income would be subject to tax at the Fund level and to a further tax at the shareholder level when such income is distributed. In such event, in order to re-qualify for taxation as a RIC, the Fund might be required to recognize unrealized gains, pay substantial taxes and interest and make certain distributions. This would cause investors to incur higher tax liabilities than they otherwise would have incurred and would have a negative impact on Fund returns. In such event, the Fund’s Board of Trustees may determine to reorganize or close the Fund or materially change the Fund’s investment objective and strategies. In the event that the Fund fails to qualify as a RIC, the Fund will promptly notify shareholders of the implications of that failure. |
| Trading Issues Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | TRADING ISSUES RISK. Trading in Fund shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable. In addition, trading in Fund shares on the Exchange is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. There can be no assurance that the requirements of the Exchange necessary to maintain the listing of the Fund will continue to be met or will remain unchanged. The Fund may have difficulty maintaining its listing on the Exchange in the event the Fund’s assets are small, the Fund does not have enough shareholders, or if the Fund is unable to proceed with creation and/or redemption orders. |
| Underlying ETF Concentration Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | UNDERLYING ETF CONCENTRATION RISK. An Underlying ETF may be susceptible to an increased risk of loss, including losses due to adverse events that affect the Underlying ETF's investments more than the market as a whole, to the extent that the Underlying ETF's investments are concentrated in the securities and/or other assets of a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector, market segment or asset class. |
| Underlying ETF Exposure Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | UNDERLYING ETF EXPOSURE RISK. An investment in the Fund may provide returns that are lower than the returns that an investor could achieve by investing in one or more of the Underlying ETFs alone. Additionally, if one or more of the Underlying ETFs has not appreciated to a level above the Target Upside Deductible at the time that you invest in the Fund, you may derive no benefit from the Fund’s investment in that Underlying ETF if the Underlying ETF does not remain above the Target Upside Deductible at the end of the applicable Target Outcome Period. Likewise, each Underlying ETF will experience all losses on a one-to-one basis and does not provide any protection against SPY losses. The Fund does not provide protection against Underlying ETF losses or SPY losses. The Fund does not itself pursue a target outcome strategy and does not provide any protection against Underlying ETF losses. |
| Underlying ETF Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | UNDERLYING ETF RISK. The Fund’s investment in shares of the Underlying ETFs subjects it to the risks of owning the securities held by the Underlying the ETF, as well as the same structural risks faced by an investor purchasing shares of the Fund, including absence of an active market risk, premium/discount risk and trading issues risk. As a shareholder in another ETF, the Fund bears its proportionate share of the ETF’s expenses, subjecting Fund shareholders to duplicative expenses. |
| Upside Rate of Return Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | UPSIDE RATE OF RETURN RISK. A new Upside Rate of Return for each Underlying ETF is established at the beginning of each Target Outcome Period and is dependent on prevailing market conditions. As a result, the Upside Rate of Return may rise or fall from one Target Outcome Period to the next and is unlikely to remain the same for consecutive Target Outcome Periods. Additionally, the price return of SPY may need to materially exceed the Target Upside Deductible before an Underlying ETF recoups foregone returns with an Upside Rate of Return. |
| Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You could lose money by investing in the Fund. |
| Risk Not Insured Depository Institution [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. |