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Innovator IBD ® 50 ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Innovator IBD ® 50 ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks to track, before fees and expenses, the performance of the IBD® 50 Index (the “Index”).
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund (“Shares”). Investors may pay brokerage commissions on their purchases and sales of Shares, which are not reflected in the table or the example below.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Mar. 01, 2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it purchases and sells securities (or “turns over” its portfolio). A higher portfolio turnover will cause the Fund to incur additional transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the example, may affect the Fund’s performance. During the fiscal year ended October 31, 2018, the Fund’s portfolio turnover rate was 719% of the average value of its portfolio, excluding the value of portfolio securities received or delivered as a result of the Fund’s in-kind creations and redemptions.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 719.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions Investors may pay brokerage commissions on their purchases and sales of Shares, which are not reflected in the table or the example below.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds.


This example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain at current levels. This example does not include the brokerage commissions that investors may pay to buy and sell Shares.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, your costs, based on these assumptions, would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund will normally invest at least 80% of its net assets (including investment borrowings) in securities that comprise the Index. The Fund, using an indexing investment approach, attempts to replicate, before fees and expenses, the performance of the Index. The Fund’s investment sub-adviser seeks a correlation of 0.95 or better (before fees and expenses) between the Fund’s performance and the performance of the Index; a figure of 1.00 would represent perfect correlation.


The IBD® 50 Index is a weekly, rules-based, computer-generated stock index compiled and published by Investor’s Business Daily® (“IBD” or the “Index Provider”) that seeks to identify the current top 50 growth stocks. The equity portion of the Index primarily includes U.S. common stocks, but may, to a lesser extent, include common stocks of non-U.S. companies that utilize American Depositary Receipts (“ADRs”) to trade on U.S. securities exchanges. The equity securities comprising the Index may be issued by small-, mid- and large-capitalization companies located in either developed or emerging markets. The Index is also designed to be responsive to downturns in the equities markets and incorporates a cash equivalents portion in response to certain market signals described below.


The Index’s initial universe of the approximately 7,000 equity securities that trade on the New York Stock Exchange, The Nasdaq Stock Market, LLC or NYSE MKT LLC is initially narrowed down by excluding those companies that do not meet certain baseline criteria. These criteria include minimum stock price, minimum trading volume, minimum upward price movement and minimum simple price moving average. IBD then narrows the universe further by screening out securities with price actions IBD views as undesirable. For instance, IBD removes securities with excessive price percentage moves in its 10-week price moving average (6% or more), securities with a high number of positive price movement days over a 14-day period (seven or more), securities with a high number of positive price movement weeks over an 8-week period (six or more) and/or securities with a high number of consecutive positive price movement weeks (three or more). These criteria are explained in detail in “Index Information.”


IBD then evaluates and scores the remaining securities on the following 11 factors: Earnings Per Share Rating; Relative Price Strength Rating; Sales Margin Return on Equity Rating; Accumulation Distribution Rating; Industry Group Relative Strength; Growth in Quarterly Earnings/Next Quarter Consensus Estimates; 3-to-5 Year Annual Growth Rate/Next Year’s Consensus Estimates; Quarterly Sales Growth/Next Quarter Consensus Estimates; Acceleration in Quarterly Sales or Earnings; Liquidity and Annual Return on Equity. These factors are also explained in detail in “Index Information.”


Each security is given a score for each factor. Each security’s 11 factor scores are then aggregated to provide a composite score. The 50 securities with the highest score are included in the Index and weighted according to their score. Securities with the ten highest scores are given a weight of 3.5%. Securities with the 11-20 highest scores are given a weight of 3.0%. Securities with the 21-30 highest scores are given a weight of 2.0%. Securities with the 31-40 highest scores are given a weight of 1.0% and securities with the 41-50 highest scores are given a weight of 0.5%.


However, the Index is also designed to be responsive to the overall health of the equities market. The Index contains cash equivalents positions composed of U.S. Treasury bills (“cash positions”) that allow it to adopt a defensive approach upon the occurrence of certain market signals that indicate that the equities market may be in, or entering, a downturn. Upon the occurrence of a combination of the four market signals listed below, at the next Index reconstitution, the cash positions will comprise 50% of the Index. While the Index is composed of 50% cash positions, each equity security will be weighted at half of its ordinary weight.


 

1.

Year-over-year margin debt of 55%;

 

2.

S&P 500 more than tripling in value over a 5-year time period;

 

3.

The average closing prices of the last 5 weeks of the S&P 500 having a lower value than the average closing prices of the last 50 weeks of the S&P 500; or

 

4.

Falling relative price performance of the S&P 500 in relation to itself over an 89-week time period (i.e. when the S&P 500’s average short-term prices fall below its average long-term prices).

The Index will remain composed of 50% cash positions until the occurrence of a combination of the three market conditions listed below. Upon the occurrence of this combination, the Index will revert to being composed entirely of equity securities.


 

1.

The value of the S&P 500 declining by 50%;

 

2.

The index price of the S&P 500 being greater than its average monthly closing price over the last 10 months; or

 

3.

The S&P 500’s average price for the previous 5 weeks approaches its average price for the previous 50 weeks.

The Fund generally invests in all of the securities comprising the Index in proportion to the weightings of the securities in the Index. The Index is rebalanced and reconstituted on the last day of each trading week after the U.S. stock market closes. This weekly rebalancing and reconstituting of the Index will cause the Fund to have a higher portfolio turnover rate than similar funds.


To the extent the Index concentrates (i.e., holds 25% or more of its total assets) in the securities of a particular industry or group of industries, the Fund will concentrate its investments to the same extent. As of February 15, 2019, the Fund was concentrated in the information technology sector.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. 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. There can be no assurance that the Fund’s investment objectives will be achieved.


Active Markets Risk. Although the Shares are listed for trading on the Exchange, there can be no assurance that an active trading market for the Shares will develop or be maintained. Shares trade on the Exchange at market prices that may be below, at or above the Fund’s net asset value (“NAV”). Securities, including the Shares, are subject to market fluctuations and liquidity constraints that may be caused by such factors as economic, political, or regulatory developments, changes in interest rates, and/or perceived trends in securities prices. Shares of the Fund could decline in value or underperform other investments.


Authorized Participation Concentration Risk. Only an authorized participant may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of institutions that may act as authorized participants on an agency basis (i.e., on behalf of other market participants). To the extent that authorized participants exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other authorized participant is able to step forward to create or redeem “Creation Units,” Shares may be more likely to trade at a premium or discount to the Fund’s NAV and possibly face trading halts and/or delisting.


Concentration Risk. To the extent that the Index concentrates in the securities of issuers in a particular industry or sector, the Fund will also concentrate its investments to approximately the same extent. The Fund may be susceptible to loss due to adverse occurrences to the extent that the Fund’s investments are concentrated in a particular issuer or issuers, region, market, industry, group of industries, sector or asset class.


Currency Risk. Changes in currency exchange rates affect the value of investments denominated in a foreign currency, and therefore the value of such investments in the Fund’s portfolio. The Fund’s NAV could decline if a currency to which the Fund has exposure depreciates against the U.S. dollar or if there are delays or limits on repatriation of such currency. Currency exchange rates can be very volatile and can change quickly and unpredictably. As a result, the value of an investment in the Fund may change quickly and without warning.


Cyber Security Risk. The Fund is susceptible to operational 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. 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. In addition, cyber security breaches of the Fund’s third-party service providers, such as its administrator, transfer agent, custodian, or sub-adviser, as applicable, or issuers in which the Fund invests, can also subject the Fund to many of the same risks associated with direct cyber security breaches. While the Fund has established business continuity plans and risk management systems designed to reduce the risks associated with cyber security, there are inherent limitations in such plans and systems. Additionally, 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.


Depositary Receipts Risk. Depositary receipts may be subject to certain of the risks associated with direct investments in the securities of foreign companies, such as currency, political, economic and market risks, because their values depend on the performance of the non-dollar denominated underlying foreign securities. Certain countries may limit the ability to convert depositary receipts into the underlying foreign securities and vice versa, which may cause the securities of the foreign company to trade at a discount or premium to the market price of the related depositary receipts. Depositary receipts may be purchased through “sponsored” or “unsponsored” facilities. A sponsored facility is established jointly by a depositary and the issuer of the underlying security. A depositary may establish an unsponsored facility without participation by the issuer of the deposited security. Unsponsored receipts may involve higher expenses and may be less liquid. Holders of unsponsored depositary receipts generally bear all the costs of such facilities, and the depositary of an unsponsored facility frequently is under no obligation to distribute shareholder communications received from the issuer of the deposited security or to pass through voting rights to the holders of such receipts in respect of the deposited securities.


Emerging Markets Risk. Emerging markets may be more likely to experience inflation risk, political turmoil and rapid changes in economic conditions than more developed markets. Emerging markets often have less uniformity in accounting and reporting requirements, unreliable securities valuation and greater risk with custody of securities than developed markets. Additionally, emerging markets often have greater risk of capital controls through such measures as taxes or interest rate control than developed markets. Certain emerging market countries may also lack the required infrastructure to attract large amounts of non-U.S. trade and investment.


Equity Securities Risk. Equity securities may decline in value because of declines in the price of a particular holding or the broad stock market. Such declines may relate directly to the issuer of a security or broader economic or market events, including changes in interest rates. The value of Shares will fluctuate with changes in the value of the equity securities the Fund invests in.


Growth Risk. Growth stocks may be out of favor or may not produce the best results over short or longer time periods. They may also increase the volatility of the Fund’s share price. Growth stocks tend to be more expensive relative to their earnings or assets compared to other types of stocks. These companies tend to invest a high portion of earnings in their businesses and may lack the dividends of value stocks that can cushion stock prices in falling markets. As a result, growth stocks tend to be sensitive to changes in their earnings and more volatile than other types of stocks.


Index Provider Risk. The Fund seeks to achieve returns that generally correspond, before fees and expenses, to the performance of their Index, as published by their Index Provider. There is no assurance that the Index Provider will compile its Index accurately, or that the Index will be determined, composed or calculated accurately. While the Index Provider gives descriptions of what the Index is designed to achieve, the Index Provider does not provide any warranty or accept any liability in relation to the quality, accuracy or completeness of data in its indices, and it does not guarantee that its Index will be in line with its methodology.


Information Technology Companies Risk. Information technology companies face intense competition, both domestically and internationally, which may have an adverse effect on profit margins. Like other technology companies, information technology companies may have limited product lines, markets, financial resources or personnel. The products of information technology companies may face obsolescence due to rapid technological developments, frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Companies in the information technology sector are heavily dependent on patent and intellectual property rights. The loss or impairment of these rights may adversely affect the profitability of these companies.


Market Maker Risk. If the Fund has lower average daily trading volumes, it may rely on a small number of third-party market makers to provide a market for the purchase and sale of Shares. Any trading halt or other problem relating to the trading activity of these market makers could result in a dramatic change in the spread between the Fund’s net asset value and the price at which the Shares are trading on the Exchange, which could result in a decrease in value of the Shares. In addition, 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. This reduced effectiveness could result in Shares trading at a discount to net asset value and also in greater than normal intra-day bid-ask spreads for Shares.


Market Risk. Market risk is the risk that a particular security owned by the Fund or Fund Shares in general may fall in value. Securities are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in securities prices. Shares could decline in value or underperform other investments.


Non-U.S. Investment Risk. Investments in securities of non-U.S. companies (particularly in emerging markets) present risks beyond those of securities of U.S. issuers and can be more volatile than investments in U.S. companies. Risks of investing in securities of foreign companies include: different accounting standards; expropriation, nationalization or other adverse political or economic developments; currency devaluation, blockages or transfer restrictions; changes in foreign currency exchange rates; taxes; restrictions on non-U.S. investments and exchange of securities; and less government supervision and regulation of issuers in non-U.S. countries. Further, other diplomatic, political or economic developments can affect investments in foreign companies. Prices of non-U.S. securities may also be more volatile. Finally, the value of securities denominated in foreign currencies, and of dividends from such securities, can change significantly when foreign currencies strengthen or weaken relative to the U.S. dollar.


Passive Investment Risk. The Fund invests in the securities included in the Index regardless of their investment merit. The Fund does not attempt to outperform the Index or take defensive positions in declining markets, except in connection with the Index’s risk reduction mechanism. As a result, the Fund’s performance may be adversely affected by a general decline in the market segments relating to the Index.


Portfolio Turnover Risk. High portfolio turnover (higher than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer markups and other transaction costs on the sale of the securities and on reinvestment in other securities, as well as possible increased taxable distributions.


Premium/Discount Risk. The net asset value of Shares will generally fluctuate with changes in the market value of the Fund’s holdings. The market prices of Shares will generally fluctuate in accordance with change in net asset value as well as the relative supply of and demand for Shares on the Exchange. The Fund cannot predict whether Shares will trade bellow (discount), at or above (premium) their 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 to, 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.


Security Issuer Risk. Issuer-specific attributes may cause a security held by the Fund to be more volatile than the market generally. The value of an individual security or particular type of security may be more volatile than the market as a whole and may perform differently from the value of the market as a whole.


Small- and Mid- Capitalization Company Risk. Generally, small- or mid- capitalization companies, which are often less seasoned, have more potential for rapid growth. However, they often involve greater risk than large cap companies and these risks are passed on to funds that invest in them. These companies may not have the management experience, financial resources, product diversification and competitive strengths of larger companies.


Tracking Error Risk. The Fund’s return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and incurs costs in buying and selling securities, especially when rebalancing the Fund’s securities holdings to reflect changes in the composition of the Index. In addition, the performance of the Fund and the Index may vary due to asset valuation differences and differences between the Fund’s portfolio and the Index resulting from legal restrictions, cost or liquidity constraints.


Trading Issues Risk. Although the Shares are listed for trading on the Exchange, there can be no assurance that an active trading market for such Shares will develop or be maintained. Trading in 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 Shares on the Exchange is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange “circuit breaker” rules. Market makers are under no obligation to make a market in the Shares, and authorized participants are not obligated to submit purchase or redemption orders for Creation Units. 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.


U.S. Government Securities Risk. U.S. government securities are subject to interest rate risk but generally do not involve the credit risks associated with investments in other types of debt securities. As a result, the yields available from U.S. government securities are generally lower than the yields available from other debt securities. U.S. government securities are guaranteed only as to the timely payment of interest and the payment of principal when held to maturity. While securities issued or guaranteed by U.S. federal government agencies (such as Ginnie Mae) are backed by the full faith and credit of the U.S. Department of the Treasury, securities issued by government sponsored entities (such as Fannie Mae and Freddie Mac) are solely the obligation of the issuer and generally do not carry any guarantee from the U.S. government.


The Shares will change in value, and you could lose money by investing in the Fund. The Fund may not achieve its investment objective.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

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 compare to those of the Index and a broad-based market index. Prior to November 20, 2017, the Fund was actively managed using a quantitative strategy substantially similar to the methodology of the Index. The Fund’s performance information is accessible on the Fund’s website at www.innovatoretfs.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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 compare to those of the Index and a broad-based market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.innovatoretfs.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns as of 12/31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fund’s highest quarterly return was 16.59% (quarter ended September 30, 2017) and the Fund’s lowest quarterly return was (27.98)% (quarter ended December 31, 2018).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2017
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.59%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (27.98%)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged On November 20, 2017, the Fund began tracking the IBD® 50 Index. Because the IBD® 50 Index had an inception date of October 27, 2017, performance information is not included above.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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 rr_PerformanceTableNotRelevantToTaxDeferred 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 Shares in tax-deferred accounts such as individual retirement accounts (IRAs) or employee-sponsored retirement plans.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

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


Returns before taxes do not reflect the effects of any income or capital gains taxes. 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. Returns after taxes on distributions reflect the taxed return on the payment of dividends and capital gains.


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 Shares in tax-deferred accounts such as individual retirement accounts (IRAs) or employee-sponsored retirement plans.
Caption rr_AverageAnnualReturnCaption Average Annual Total Return as of December 31, 2018
Innovator IBD ® 50 ETF | IBD® 50 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel IBD® 50 Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (16.05%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception [1],[2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Apr. 08, 2015
Innovator IBD ® 50 ETF | S&P 500® Total Return Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500® Total Return Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.38%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.29%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Apr. 08, 2015
Innovator IBD ® 50 ETF | Innovator IBD(R) 50 ETF  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.70%
Other Expenses rr_OtherExpensesOverAssets 0.14%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84%
(Less Fees Waived/Expenses Reimbursed) rr_FeeWaiverOrReimbursementOverAssets (0.04%) [3]
Total Annual Fund Operating Expenses After Fees Waived/Expenses Reimbursed rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 264
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 462
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,033
Annual Return 2016 rr_AnnualReturn2016 9.10%
Annual Return 2017 rr_AnnualReturn2017 37.32%
Annual Return 2018 rr_AnnualReturn2018 (16.63%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (16.63%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.78%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Apr. 08, 2015
Innovator IBD ® 50 ETF | Innovator IBD(R) 50 ETF | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (16.63%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.76%
Innovator IBD ® 50 ETF | Innovator IBD(R) 50 ETF | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.84%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.13%
[1] On November 20, 2017, the Fund began tracking the IBD® 50 Index. Because the IBD® 50 Index had an inception date of October 27, 2017, performance information is not included above.
[2] Performance data is not available for all the periods shown in the table for the index because performance data does not exist for the entire period.
[3] The Fund's investment adviser has contractually agreed to waive its advisory fees and/or assume as its own expense certain expenses otherwise payable by the Fund to the extent necessary to ensure that total annual fund operating expenses (excluding any Rule 12b-1 fees, taxes, interest, brokerage fees, acquired fund fees and expenses, expenses incurred in connection with any merger, reorganization or proxy solicitation, litigation, and other extraordinary expenses) do not exceed 0.80% of average daily net assets until March 1, 2020. Pursuant to its expense limitation agreement with the Fund, the investment adviser is entitled to recoup any fees that it waived and/or Fund expenses that it paid for a period of three years following such fee waivers and/or expense payments. The Fund may only make such repayment to the investment adviser if, after the recoupment payment has been taken into account, it does not cause the Fund's expense ratio to exceed either the expense cap in place at the time the expenses were waived or the Fund's current expense cap.