Objective, Primary [Text Block]

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Risk/Return [Heading]

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Cambria Shareholder Yield ETF

Objective [Heading]

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INVESTMENT OBJECTIVE

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The Fund seeks investment results that correspond (before fees and expenses) generally to the price and yield performance of its underlying index, the Cambria Shareholder Yield Index (the "Underlying Index").

Expense [Heading]

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FEES AND EXPENSES

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold Shares. You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table.

Operating Expenses Caption [Text]

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ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT YOU PAY EACH YEAR AS A PERCENTAGE OF THE VALUE OF YOUR INVESTMENT)

Portfolio Turnover [Heading]

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PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

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The Fund may pay transaction costs, including commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund's performance. For the fiscal year ended April 30, 2019, the Fund's portfolio turnover rate was 28% of the average value of its portfolio.

Portfolio Turnover, Rate

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28.00%

Expense Exchange Traded Fund Commissions [Text]

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You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table.

Expense Example [Heading]

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EXAMPLE

Expense Example Narrative [Text Block]

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The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The example also assumes that the Fund provides a return of 5% a year and that the operating expenses remain the same. The example does not reflect any brokerage commissions that you may pay on purchases and sales of Shares. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading]

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PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block]

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An issuer must have a high ranking across a composite of the following characteristics to be eligible for inclusion in the Underlying Index:

1. Strong cash flows;

2. Payment of dividends to shareholders;

3. Net stock buybacks; and

4. Net debt paydown.

Each of these characteristics will be measured on a one-month to 12-month basis by the Underlying Index methodology, and no single measurement will be dispositive. Pursuant to its rules-based methodology, the Underlying Index initially selects the top 20% of stocks in the initial universe of U.S.-based issuers according to shareholder yield, which is based on a stock's dividend payments and net share buybacks. The Underlying Index then applies a number of valuation factors to the remaining stocks and selects the 100 stocks that exhibit, in the aggregate, the best combination of the following characteristics: strong cash flows and debt paydown, and high dividends paid to shareholders and net stock buybacks. The Underlying Index selects Index components based only on publicly available data and includes screens to limit its industry concentration to 25% in order to seek to ensure its liquidity and investability. The Underlying Index is rebalanced and reconstituted quarterly, and Index components are equally weighted at each rebalance.

The Underlying Index will invest primarily in equity securities, including common stock, of U.S. companies. The Underlying Index may invest in securities of companies in any industry. Although the Underlying Index generally expects to invest in companies with larger market capitalizations, the Underlying Index may invest in small- and mid-capitalization companies.

The Fund may invest up to 20% of its net assets in instruments not included in the Underlying Index, but which the Fund's investment adviser, Cambria Investment Management, L.P. ("Cambria" or the "Adviser"), believes will help the Fund track the Underlying Index. For example, there may be instances in which Cambria may choose to purchase or sell securities not in the Underlying Index which Cambria believes are appropriate to substitute for one or more such securities.

The Fund employs a "passive management"—or indexing—investment approach and seeks to track the performance of the Underlying Index. To track the performance of the Underlying Index, the Fund intends to employ a replication strategy, which means that the Fund will typically invest in substantially all of the components of the Underlying Index in approximately the same weights as they appear in the Underlying Index.

The Underlying Index was developed by Cambria Indices, LLC, an affiliate of Cambria, and is calculated by Solactive, AG, which is not affiliated with the Fund or Cambria. To the extent that the Underlying Index concentrates (i.e., holds 25% or more of its total assets) in the securities of a particular sector, the Fund is expected to concentrate in that sector to approximately the same extent. As of July 31, 2019, the Fund and the Underlying Index were concentrated in the financial services sector and had significant exposure to companies in the consumer discretionary, information technology and industrial sectors.

Strategy Portfolio Concentration [Text]

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Under normal market conditions, the Fund will invest at least 80% of its total assets in the components of the Underlying Index. The Underlying Index is comprised of equity securities issued by U.S.-based issuers. The Underlying Index considers an issuer to be U.S.-based if it is domiciled or incorporated or has substantial business activity in the United States. In addition, to the extent that the Underlying Index concentrates (i.e., holds 25% or more of its total assets) in the securities of a particular sector, the Fund is expected to concentrate in that sector to approximately the same extent. As of July 31, 2019, the Fund and the Underlying Index were concentrated in the financial services sector and had significant exposure to companies in the consumer discretionary, information technology and industrial sectors.

Risk [Heading]

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PRINCIPAL RISKS

Risk Narrative [Text Block]

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An investment in the Fund involves risk. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The Fund's principal risks are presented in alphabetical order to facilitate investors' ability to identify particular risks and compare them with the risks of other funds. Some or all of these risks may adversely affect the Fund's net asset value per share ("NAV"), trading price, yield, total return, and/or ability to meet its objective. There is no assurance that the Fund will achieve its investment objective. An investor may lose money by investing in the Fund. For more information about the risks of investing in the Fund, see the sections titled "Additional Information About the Funds' Risks" and "Additional Non-Principal Risk Information."

Cyber Security Risk. The Fund may be susceptible to operational and information security risks resulting from a breach in the Fund's cyber security, including cyber-attacks against the Fund, third-party service providers, market makers, Authorized Participants, or issuers of securities in which the Fund invests. A breach in cyber security, intentional or unintentional, may adversely impact the Fund in many ways, including, but not limited to, disruption of the Fund's operational capacity, loss of proprietary information, theft or corruption of data, denial-of-service attacks on websites or network resources, and the unauthorized release of confidential information.

Dividend Paying Security Risk. Securities that pay high dividends as a group can fall out of favor with the market, causing these companies to underperform companies that do not pay high dividends. Also, changes in the dividend policies of companies owned by the Fund and the capital resources available for these companies' dividend payments may adversely affect the Fund.

Equity Investing Risk. The values of equity securities could decline generally or could underperform other investments due to factors affecting a specific issuer, market or securities markets generally.

Investment Risk. 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 government agency. When you sell your Shares, they could be worth less than what you paid for them.

Large Capitalization Company Risk. The Fund's investments in large capitalization companies may underperform other segments of the market because they may be less responsive to competitive challenges and opportunities and unable to attain high growth rates during periods of economic expansion.

Market Events Risk. Turbulence in the financial markets and reduced liquidity in the equity markets may negatively affect issuers, which could have an adverse effect on the Fund. In addition, there is a risk that policy changes by the U.S. Government, Federal Reserve and/or other government actors, such as increasing interest rates, could cause increased volatility in financial markets and higher levels of Fund redemptions, which could have a negative impact on the Fund. In a declining stock market, stock prices for all companies (including those in the Fund's portfolio) may decline, regardless of their long-term prospects.

Passive Investment Risk. The Fund is managed with a passive investment strategy, attempting to track the performance of the Underlying Index. As a result, the Fund expects to hold components of the Underlying Index regardless of their current or projected performance. Maintaining investments regardless of market conditions or the performance of individual investments could cause the Fund's return to be lower than if the Fund employed an active strategy.

Premium-Discount Risk. Shares may trade above (premium) or below (discount) their NAV. The market prices of Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of, and demand for, Shares on the Exchange. This risk is heightened in times of market volatility or periods of steep market declines.

Quantitative Security Selection Risk. The Underlying Index uses quantitative techniques to determine whether securities should be included in the Underlying Index, and the Underlying Index may not perform as intended if it relies on erroneous or outdated data from one or more third parties. Errors in data used in the quantitative model may occur from time to time and may not be identified and/or corrected before having an adverse impact on the Fund and its shareholders.

Secondary Market Trading Risk. Investors buying or selling Shares in the secondary market may pay brokerage commissions, which may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of Shares. Although the Shares are listed on the Exchange, there can be no assurance that an active or liquid trading market for them will develop or be maintained. In addition, trading in Shares on the Exchange may be halted.

Sector Concentration Risk. To the extent that the Fund's investments are concentrated in a particular sector, the Fund may be susceptible to loss due to adverse occurrences affecting that sector. As of July 31, 2019, the Fund and the Underlying Index were concentrated in the financial services sector and had significant exposure to companies in the consumer discretionary, industrial and information technology sectors.

Consumer Discretionary Sector Risk. The success of consumer product manufacturers and retailers is tied closely to the performance of the overall domestic and international economy, interest rates, competitive and consumer confidence. Success depends heavily on disposable household income and consumer spending. Changes in demographics and consumer tastes can also affect the demand for, and success of, consumer products in the marketplace.

Financial Services Sector Risk. Performance of companies in the financial services sector may be adversely impacted by many factors, including, among others, government regulations, economic conditions, credit rating downgrades, changes in interest rates, and decreased liquidity in credit markets. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted.

Industrial Sector Risk. Issuers in the industrial sector are affected by supply and demand, both for their specific product or service and for industrial sector products in general. The products of such issuers may face obsolescence due to rapid technological developments and frequent new product introduction. Government regulations, world events, economic conditions and exchange rates affect the performance of companies in the industrial sector. Issuers in the industrial sector may be adversely affected by liability for environmental damage, product liability claims and exchange rates. The industrial sector may also be adversely affected by changes or trends in commodity prices, which may be influenced by unpredictable factors.

Information Technology Sector Risk. Technology companies face intense competition, both domestically and internationally, which may have an adverse effect on profit margins. Technology companies may have limited product lines, markets, financial resources or personnel. The products of technology companies may face obsolescence due to rapid technological developments and frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Companies in the 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.

Small and Medium Capitalization Company Risk. Investing in securities of small and medium capitalization companies involves greater risk than customarily is associated with investing in larger, more established companies. These companies' securities may be more volatile and less liquid than those of more established companies, and they may be more sensitive to market conditions.

Tracking Error Risk. Although the Fund attempts to track the performance of the Underlying Index, the Fund may not be able to duplicate its exact composition or return due to, among other things, fees and expenses paid by the Fund that are not reflected in the Underlying Index. If the Fund is small, it may experience greater tracking error to its Underlying Index than it otherwise would at higher asset levels.

Value Investment Risk. The Fund's shareholder yield strategy is a value investment strategy that should be expected to underperform in growth markets. Value investments are subject to the risk that their intrinsic value may never be realized by the market.

Risk Lose Money [Text]

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An investor may lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

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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 government agency.

Bar Chart and Performance Table [Heading]

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PERFORMANCE

Performance Narrative [Text Block]

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The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund's average annual total returns compare with those of the Index as well as a relevant index that provides a broad measure of market performance. Prior to March 26, 2018, the Fund was actively managed and did not seek investment results that correspond (before fees and expenses) generally to the price and yield performance of the Index. All returns include the reinvestment of dividends and distributions. As always, please note that the Fund's past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available at www.cambriafunds.com.

Performance Information Illustrates Variability of Returns [Text]

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The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund’s average annual total returns compare with those of the Index as well as a relevant index that provides a broad measure of market performance.

Performance Availability Website Address [Text]

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www.cambriafunds.com.

Performance Past Does Not Indicate Future [Text]

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As always, please note that the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

Bar Chart [Heading]

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Total Annual Returns for Calendar Year Ended December 31

Bar Chart Closing [Text Block]

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As of July 31, 2019, the Fund's year-to-date total return was 13.96%.

Best and Worst Quarter Returns (for the period reflected in the bar chart above)

Best: 9.07%, for the quarter ended 12/31/2013

Worst: -17.29%, for the quarter ended 12/31/2018

Performance Table Heading

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Average Annual Total Returns for the period ending December 31, 2018

Performance Table Uses Highest Federal Rate

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Performance Table One Class of after Tax Shown [Text]

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Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.

Performance Table Closing [Text Block]

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Average annual total returns are shown on a before- and after-tax basis for the Fund. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.

Cambria Shareholder Yield ETF | Cambria Shareholder Yield ETF

Distribution and/or Service (12b-1) fees:

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Management Fee:

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0.59%

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none

Other Expenses:

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none

Total Annual Fund Operating Expenses:

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0.59%

One Year:

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$ 60

Three Years:

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189

Five Years:

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329

Ten Years:

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$ 738

Annual Return 2014

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11.09%

Annual Return 2015

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(1.25%)

Annual Return 2016

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15.26%

Annual Return 2017

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19.74%

Annual Return 2018

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(13.36%)

Year to Date Return, Label

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year-to-date total return

Bar Chart, Year to Date Return, Date

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Jul. 31, 2019

Bar Chart, Year to Date Return

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13.96%

Highest Quarterly Return, Label

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Best Quarter

Highest Quarterly Return, Date

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Dec. 31, 2013

Highest Quarterly Return

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9.07%

Lowest Quarterly Return, Label

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Worst Quarter

Lowest Quarterly Return, Date

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Dec. 31, 2018

Lowest Quarterly Return

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(17.29%)

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Return Before Taxes

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(13.36%)

^[1]

rr_AverageAnnualReturnYear05

5.57%

^[1]

rr_AverageAnnualReturnSinceInception

8.19%

^[1]

Cambria Shareholder Yield ETF | S&P 500 Index

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May 13, 2013

Index No Deduction for Fees, Expenses, Taxes [Text]

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Reflects no deduction for fees, expenses or taxes

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S&P 500 Index (Reflects no deduction for fees, expenses or taxes)

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(4.38%)

^[1]

rr_AverageAnnualReturnYear05

8.49%

^[1]

rr_AverageAnnualReturnSinceInception

10.14%

^[1]

Cambria Shareholder Yield ETF | Return After Taxes on Distributions | Cambria Shareholder Yield ETF

rr_AverageAnnualReturnInceptionDate

May 13, 2013

rr_ProspectusLineItems

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

rr_AverageAnnualReturnYear01

(13.88%)

^[1]

rr_AverageAnnualReturnYear05

4.52%

^[1]

rr_AverageAnnualReturnSinceInception

7.15%

^[1]

Cambria Shareholder Yield ETF | Return After Taxes on Distributions and Sale of Fund Shares | Cambria Shareholder Yield ETF

rr_AverageAnnualReturnInceptionDate

May 13, 2013

rr_ProspectusLineItems

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

rr_AverageAnnualReturnYear01

(8.16%)

^[1]

rr_AverageAnnualReturnYear05

4.13%

^[1]

rr_AverageAnnualReturnSinceInception

6.34%

^[1]

Cambria Global Asset Allocation ETF

rr_AverageAnnualReturnInceptionDate

May 13, 2013

[1]

The Fund's objective changed effective March 26, 2018. Prior to that date, the Fund was actively managed and sought income and capital appreciation with an emphasis on income from investments in the U.S. equity market. As of March 26, 2018, the Fund's objective seeks investment results that correspond (before fees and expenses) generally to the price and yield performance of the Index.

XML 13 R7.htm IDEA: XBRL DOCUMENT

Label	Element	Value
Cambria Emerging Shareholder Yield ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Risk/Return [Heading]	rr_RiskReturnHeading	Cambria Emerging Shareholder Yield ETF
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks investment results that correspond (before fees and expenses) generally to the price and yield performance of its underlying index, the Cambria Emerging Shareholder Yield Index (the "Underlying Index").
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold Shares. You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table.
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)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund may pay transaction costs, including commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund's performance. For the fiscal year ended April 30, 2019, the Fund's portfolio turnover rate was 115% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	115.00%
Expense Exchange Traded Fund Commissions [Text]	rr_ExpenseExchangeTradedFundCommissions	You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table.
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLE
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The example also assumes that the Fund provides a return of 5% a year and that the operating expenses remain the same. The example does not reflect any brokerage commissions that you may pay on purchases and sales of Shares. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Fund will invest at least 80% of its total assets in the components of the Underlying Index and in depositary receipts representing components of the Underlying Index. The Underlying Index is comprised of equity securities of issuers in emerging foreign markets. The Underlying Index considers an issuer to be in an emerging foreign market if it is domiciled or listed and traded in any of the following countries: Brazil, Colombia, Czech Republic, Greece, Hong Kong (Chinese domicile), Hungary, India, Indonesia, Malaysia, Mexico, Poland, Russia, South Africa, South Korea, Taiwan, Thailand, Turkey, or a market with similar characteristics as the aforementioned. The Underlying Index provider will update the list of emerging foreign markets annually. An issuer must have a high ranking across a composite of the following characteristics to be eligible for inclusion in the Underlying Index: 1. Strong cash flows; 2. Payment of dividends to shareholders; 3. Net stock buybacks; and 4. Net debt paydown. Each of these characteristics will be measured on a one-month to 12-month basis by the Underlying Index methodology, and no single measurement will be dispositive. Pursuant to the methodology of the Underlying Index, the 100 issuers that have exhibited, in the aggregate, the strongest cash flows, the highest dividends paid to shareholders, and net stock buybacks and debt paydown will included in the Underlying Index. Although securities in the Underlying Index may be denominated in either the U.S. dollar or other currencies and may include securities of companies in any industry and of any market capitalization, the Underlying Index is weighted based only on publicly available data and includes screens to limit its country and sector concentration to 30% and 25%, respectively, in order to seek to ensure its liquidity and investability. Other screens also will exclude as components any foreign issuers whose securities are highly restricted or illegal for U.S. persons to own, including due to the imposition of sanctions by the U.S. Government. The Fund may invest up to 20% of its net assets in instruments not included in the Underlying Index, but which the Fund's investment adviser, Cambria Investment Management, L.P. ("Cambria" or the "Adviser"), believes will help the Fund track the Underlying Index. For example, there may be instances in which Cambria may choose to purchase or sell securities not in the Underlying Index which Cambria believes are appropriate to substitute for one or more such securities. The Fund employs a "passive management"—or indexing— investment approach and seeks to track the performance of the Underlying Index. To track the performance of the Underlying Index, the Fund intends to employ a replication strategy, which means that the Fund will typically invest in substantially all of the components of the Underlying Index in approximately the same proportions as the Underlying Index. The Underlying Index was developed by Cambria Indices, LLC, an affiliate of Cambria, and is calculated by Solactive, AG, which is not affiliated with the Fund or Cambria. The Underlying Index is rebalanced and reconstituted quarterly. To the extent that the Underlying 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 is expected to concentrate to approximately the same extent. As of July 31, 2019, neither the Fund nor the Underlying Index were concentrated in an industry or group of industries, but both had significant exposure to companies in the information technology and materials sectors.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	Under normal market conditions, the Fund will invest at least 80% of its total assets in the components of the Underlying Index and in depositary receipts representing components of the Underlying Index. In addition, to the extent that the Underlying 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 is expected to concentrate to approximately the same extent. As of July 31, 2019, neither the Fund nor the Underlying Index were concentrated in an industry or group of industries, but both had significant exposure to companies in the information technology and materials sectors.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	An investment in the Fund involves risk. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The Fund's principal risks are presented in alphabetical order to facilitate investors' ability to identify particular risks and compare them with the risks of other funds. Some or all of these risks may adversely affect the Fund's net asset value per share ("NAV"), trading price, yield, total return, and/or ability to meet its objective. There is no assurance that the Fund will achieve its investment objective. An investor may lose money by investing in the Fund. For more information about the risks of investing in the Fund, see the sections titled "Additional Information About the Funds' Risks" and "Additional Non-Principal Risk Information." Cash Redemption Risk. The Fund's investment strategy will require it to effect redemptions, in whole or in part, for cash. As a result, the Fund may pay out higher annual capital gain distributions and be less tax-efficient than if the in-kind redemption process was used exclusively. In addition, cash redemptions may incur higher brokerage costs than in-kind redemptions and these added costs may be borne by the Fund and negatively impact Fund performance. Concentration Risk. To the extent the Underlying Index is concentrated in a particular industry or group of industries, the Fund is also expected to be concentrated in that industry or group of industries. As a result, the Fund may be susceptible to loss due to adverse occurrences affecting that industry or group of industries. As of July 31, 2019, neither the Fund nor the Underlying Index were concentrated in an industry or group of industries, but both had significant exposure to companies in the information technology and materials sectors. Information Technology Sector Risk. Technology companies face intense competition, both domestically and internationally, which may have an adverse effect on profit margins. Technology companies may have limited product lines, markets, financial resources or personnel. The products of technology companies may face obsolescence due to rapid technological developments and frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Companies in the 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. Materials Sector Risk. Issuers in the materials sector may be adversely affected by commodity price volatility, exchange rates, import controls, increased competition, depletion of resources, technical progress, labor relations and government regulations, among other factors. Issuers in the materials sector may be liable for environmental damage and product liability claims. Production of materials may exceed demand as a result of market imbalances or economic downturns, leading to poor investment returns. Cyber Security Risk. The Fund may be susceptible to operational and information security risks resulting from a breach in the Fund's cyber security, including cyber-attacks against the Fund, third-party service providers, market makers, Authorized Participants, or issuers of securities in which the Fund invests. A breach in cyber security, intentional or unintentional, may adversely impact the Fund in many ways, including, but not limited to, disruption of the Fund's operational capacity, loss of proprietary information, theft or corruption of data, denial-of-service attacks on websites or network resources, and the unauthorized release of confidential information. Depositary Receipts Risk. The risks of investments in depositary receipts are substantially similar to the risks of investing directly in foreign securities. In addition, depositary receipts may not track the price of or may be less liquid than their underlying foreign securities, and the value of depositary receipts may change materially at times when the U.S. markets are not open for trading. Dividend Paying Security Risk. Securities that pay high dividends as a group can fall out of favor with the market, causing these companies to underperform companies that do not pay high dividends. Also, changes in the dividend policies of companies owned by the Fund and the capital resources available for these companies' dividend payments may adversely affect the Fund. Emerging Markets Risk. Emerging market investments are subject to the same risks as foreign investments and to additional risks due to greater political and economic uncertainties as well as a relative lack of information about issuers in such markets. Securities of emerging market issuers may become illiquid and be subject to volatility and high transaction costs. Equity Investing Risk. The values of equity securities could decline generally or could underperform other investments due to factors affecting a specific issuer, market or securities markets generally. Foreign Investment Risk. Returns on investments in foreign securities could be more volatile than, or trail the returns on, investments in U.S. securities. Exposures to foreign securities entail special risks, including risks due to: (i) differences in information available about foreign issuers; (ii) differences in investor protection standards in other jurisdictions; (iii) capital controls risks, including the risk of a foreign jurisdiction imposing restrictions on the ability to repatriate or transfer currency or other assets; (iv) political, diplomatic and economic risks; (v) regulatory risks; and (vi) foreign market and trading risks, including the costs of trading and risks of settlement in foreign jurisdictions. In addition, the Fund's investments in securities denominated in other currencies could decline due to changes in local currency relative to the value of the U.S. dollar, which may affect the Fund's returns. Geographic Investment Risk. To the extent the Fund invests a significant portion of its assets in the securities of companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region. As of July 31, 2019, the Fund invested a significant portion of its assets in securities of companies in Russia, South Africa and Taiwan as well as Chinese companies listed and traded in Hong Kong. Asia-Pacific Risk. Investments in securities of issuers in Asia-Pacific countries involve risks that are specific to the Asia-Pacific region, including certain legal, regulatory, political and economic risks. Certain Asia-Pacific countries have experienced expropriation and/or nationalization of assets, confiscatory taxation, political instability, armed conflict and social instability as a result of religious, ethnic, socio-economic and/or political unrest. Some economies in this region are dependent on a range of commodities, and are strongly affected by international commodity prices and particularly vulnerable to price changes for these products. China Risk. Investments in China involve risks closely tied to the social, political, and economic conditions within China. The Chinese economy may experience slower growth if domestic or global demand for Chinese goods decreases significantly and/or key trading partners implement protectionist measures such as trade tariffs. China's economy is also susceptible to economic recession, market inefficiency, rising inflation rates, volatility and pricing anomalies that may be connected to governmental influence, a lack of public information and/or social and political instability. The Chinese government maintains strict currency controls, regularly intervenes in the currency market, and plays a major role in the country's economic policies regarding foreign investments. Foreign investors are subject to the risk of loss from expropriation or nationalization of their investment assets and property, governmental restrictions on foreign investments and the repatriation of capital. Russia Risk. As a result of recent events involving Ukraine and the Russian Federation, the United States, Canada and the European Union have imposed sanctions on certain Russian individuals and corporate entities. The United States imposed additional sanctions on Russia as a result of Russia's interference in the U.S. election in 2016. Additional broader sanctions may be imposed in the future. These sanctions may result in the decline of the value and liquidity of Russian securities and could also result in the immediate freeze of Russian securities, impairing the ability of the Fund to buy, sell, receive or deliver those securities. The Fund may seek to suspend redemptions in the event that an emergency exists in which it is not reasonably practicable for the Fund to dispose of its securities or to determine the value of its net assets. South Africa Risk. South Africa's economy is heavily dependent on natural resources and commodity prices. South Africa's currency may also be vulnerable to significant fluctuations and devaluation. Access to health care, unemployment, limited economic opportunity, and other financial constraints, continue to present obstacles to South Africa's full economic development. Disparities of wealth, the pace and success of democratization and capital market development and religious and racial disaffection have also led to social and political unrest. There can be no assurance that initiatives by the South African government to address these issues will achieve the desired results. Taiwan Risk. The economy of Taiwan is heavily dependent on exports. Currency fluctuations, increasing competition from Asia's other emerge economies, and conditions that weaken demand for Taiwan's export products worldwide could have a negative impact on the Taiwanese economy as a whole. Concerns over Taiwan's history of political contention and its current relationship with China may also have a significant impact on the economy of Taiwan. International Closed-Market Trading Risk. Because the Fund's investments may be traded in markets that are closed when the Exchange is open, there are likely to be deviations between the current pricing of an underlying investment and stale investment pricing (i.e., the last quote from its closed foreign market), resulting in premiums or discounts to NAV that may be greater than those experienced by other ETFs. Investment Risk. 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 government agency. When you sell your Shares, they could be worth less than what you paid for them. Large Capitalization Company Risk. The Fund's investments in large capitalization companies may underperform other segments of the market because they may be less responsive to competitive challenges and opportunities and unable to attain high growth rates during periods of economic expansion. Market Events Risk. Turbulence in the financial markets and reduced liquidity in the equity markets may negatively affect issuers, which could have an adverse effect on the Fund. In addition, there is a risk that policy changes by the U.S. Government, Federal Reserve and/or other government actors, such as increasing interest rates, could cause increased volatility in financial markets and higher levels of Fund redemptions, which could have a negative impact on the Fund. In a declining stock market, stock prices for all companies (including those in the Fund's portfolio) may decline, regardless of their long-term prospects. Passive Investment Risk. The Fund is managed with a passive investment strategy, attempting to track the performance of the Underlying Index. As a result, the Fund expects to hold components of the Underlying Index regardless of their current or projected performance. Maintaining investments regardless of market conditions or the performance of individual investments could cause the Fund's return to be lower than if the Fund employed an active strategy. Portfolio Turnover Risk. The Fund's strategy may frequently involve buying and selling portfolio securities to rebalance the Fund's exposure to various market sectors. Higher portfolio turnover may result in the Fund paying higher levels of transaction costs and generating greater tax liabilities for shareholders. Portfolio turnover risk may cause the Fund's performance to be less than you expect. Premium-Discount Risk. Shares may trade above (premium) or below (discount) their NAV. The market prices of Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of, and demand for, Shares on the Exchange. This risk is heightened in times of market volatility or periods of steep market declines. Quantitative Security Selection Risk. The Underlying Index uses quantitative techniques to determine whether securities should be included in the Underlying Index, and the Underlying Index may not perform as intended if it relies on erroneous or outdated data from one or more third parties. Errors in data used in the quantitative model may occur from time to time and may not be identified and/or corrected before having an adverse impact on the Fund and its shareholders. Secondary Market Trading Risk. Investors buying or selling Shares in the secondary market may pay brokerage commissions, which may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of Shares. Although the Shares are listed on the Exchange, there can be no assurance that an active or liquid trading market for them will develop or be maintained. In addition, trading in Shares on the Exchange may be halted. Small and Medium Capitalization Company Risk. Investing in securities of small and medium capitalization companies involves greater risk than customarily is associated with investing in larger, more established companies. These companies' securities may be more volatile and less liquid than those of more established companies, and they may be more sensitive to market conditions. Tracking Error Risk. Although the Fund attempts to track the performance of the Underlying Index, the Fund may not be able to duplicate its exact composition or return due to, among other things, fees and expenses paid by the Fund that are not reflected in the Underlying Index. If the Fund is small, it may experience greater tracking error to its Underlying Index than it otherwise would at higher asset levels. Value Investment Risk. The Fund's shareholder yield strategy is a value investment strategy that should be expected to underperform in growth markets. Value investments are subject to the risk that their intrinsic value may never be realized by the market.
Risk Lose Money [Text]	rr_RiskLoseMoney	An investor may 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 government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund's average annual total returns compare with those of the Index as well as a relevant index that provides a broad measure of market performance. All returns include the reinvestment of dividends and distributions. As always, please note that the Fund's past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available at www.cambriafunds.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund’s average annual total returns compare with those of the Index as well as a relevant index that provides a broad measure of market performance.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.cambriafunds.com.
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	As always, please note that the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	Total Annual Returns for Calendar Year Ended December 31
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	As of July 31, 2019, the Fund's year-to-date total return was 14.93%. Best and Worst Quarter Returns (for the period reflected in the bar chart above) Best: 11.88% for the quarter ended 9/30/2017 Worst: -9.33% for the quarter ended 12/31/2018
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns for the period ending December 31, 2018
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Average annual total returns are shown on a before- and after-tax basis for the Fund. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	Average annual total returns are shown on a before- and after-tax basis for the Fund. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.
Cambria Emerging Shareholder Yield ETF \| Cambria Emerging Shareholder Yield ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Management Fee:	rr_ManagementFeesOverAssets	0.59%
Distribution and/or Service (12b-1) fees:	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses:	rr_OtherExpensesOverAssets	0.07%
Custodial Expenses:	rr_Component1OtherExpensesOverAssets	0.07%
Total Annual Fund Operating Expenses:	rr_ExpensesOverAssets	0.66%
One Year:	rr_ExpenseExampleYear01	$ 67
Three Years:	rr_ExpenseExampleYear03	211
Five Years:	rr_ExpenseExampleYear05	368
Ten Years:	rr_ExpenseExampleYear10	$ 822
Annual Return 2017	rr_AnnualReturn2017	38.25%
Annual Return 2018	rr_AnnualReturn2018	(14.39%)
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date total return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jul. 31, 2019
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	14.93%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2017
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	11.88%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2018
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(9.33%)
Label	rr_AverageAnnualReturnLabel	Return Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(14.39%)
Since Inception	rr_AverageAnnualReturnSinceInception	9.22%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 13, 2016
Cambria Emerging Shareholder Yield ETF \| Cambria Emerging Shareholder Yield Index
Prospectus [Line Items]	rr_ProspectusLineItems
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Reflects no deduction for fees, expenses or taxes
Label	rr_AverageAnnualReturnLabel	Cambria Emerging Shareholder Yield Index (Reflects no deduction for fees, expenses or taxes)
1 Year	rr_AverageAnnualReturnYear01	(13.58%)
Since Inception	rr_AverageAnnualReturnSinceInception	11.03%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 13, 2016
Cambria Emerging Shareholder Yield ETF \| MSCI Emerging Markets Index
Prospectus [Line Items]	rr_ProspectusLineItems
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Reflects no deduction for fees, expenses or taxes
Label	rr_AverageAnnualReturnLabel	MSCI Emerging Markets Index (Reflects no deduction for fees, expenses or taxes)
1 Year	rr_AverageAnnualReturnYear01	(14.24%)
Since Inception	rr_AverageAnnualReturnSinceInception	7.77%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 13, 2016
Cambria Emerging Shareholder Yield ETF \| Return After Taxes on Distributions \| Cambria Emerging Shareholder Yield ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Label	rr_AverageAnnualReturnLabel	Return After Taxes on Distributions
1 Year	rr_AverageAnnualReturnYear01	(15.20%)
Since Inception	rr_AverageAnnualReturnSinceInception	8.32%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 13, 2016
Cambria Emerging Shareholder Yield ETF \| Return After Taxes on Distributions and Sale of Fund Shares \| Cambria Emerging Shareholder Yield ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Label	rr_AverageAnnualReturnLabel	Return After Taxes on Distributions and Sale of Fund Shares
1 Year	rr_AverageAnnualReturnYear01	(7.54%)
Since Inception	rr_AverageAnnualReturnSinceInception	7.56%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 13, 2016

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Label	Element	Value
Cambria Core Equity ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Risk/Return [Heading]	rr_RiskReturnHeading	Cambria Core Equity ETF
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks capital appreciation and capital preservation with a low correlation to the broader U.S. equity market.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold Shares. You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table.
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)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund may pay transaction costs, including commissions when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may also result in a substantial amount of distributions from the Fund to be taxed as ordinary income, which may limit the tax efficiency of the Fund. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund's performance. For the fiscal year ended April 30, 2019, the Fund's portfolio turnover rate was 21% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	21.00%
Expense Exchange Traded Fund Commissions [Text]	rr_ExpenseExchangeTradedFundCommissions	You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table.
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLE
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The example also assumes that the Fund provides a return of 5% a year and that operating expenses remain the same. The example does not reflect any brokerage commissions that you may pay on purchases and sales of Shares. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	To achieve it investment objective, the Fund uses a combination of several strategies to produce capital appreciation while reducing risk exposure across market conditions. Under normal market conditions, at least 80% of the value of the Fund's net assets (plus borrowings for investment purposes) will be invested in equity securities. The Fund invests primarily in U.S. equity securities that tend to offer current dividends. The Fund focuses on high-quality companies that have prospects for long-term total returns as a result of their ability to grow earnings and their willingness to increase dividends over time. These stocks typically—but not always—will be large-cap, and will show potential for increasing dividends. The Fund seeks to be diversified across industry sectors and regions. Under normal circumstances, the Fund also sells exchange traded index call options and purchases exchange traded index put options. Writing index call options reduces the Fund's volatility, provides steady cash flow and is an important source of the Fund's return, although it also reduces the Fund's ability to profit from increases in the value of its equity portfolio. The Fund also buys index put options, which can protect the Fund from a significant market decline that may occur over a short period of time. The value of an index put option generally increases as the prices of the stocks constituting the index decrease, and decreases as those stocks increase in price. From time to time, the Fund may reduce its holdings of put options, resulting in an increased exposure to a market decline. The combination of the diversified stock portfolio, the steady cash flow from the sale of index call options and the downside protection from index put options is intended to provide the Fund with the majority of the returns associated with equity market investments while exposing investors to less risk than other equity investments. The Fund opportunistically invests where option pricing provides favorable risk/reward models and where gains can be attained independent of the direction of the broader U.S. equity market. The Fund uses proprietary models and analysis of historical portfolio profit and loss information to identify favorable option trading opportunities, including favorable call and put option spreads. In addition, the Fund's investment strategy, with respect to both equity investing and options trading, takes into account fundamental business and macroeconomic factors. However, the Fund employs discretionary trading models, and outputs from these models influence but do not dictate equity investment and options trading decisions. The Fund typically rebalances its equity holdings on a quarterly basis. The Fund aims to preserve capital, particularly in down markets (including major market drawdowns), by using put option spreads as a form of mitigation risk. Option positions are held until either they expire or are liquidated to either capture gains as option expirations approach or to adjust positions to reduce or prevent losses and to take other potentially profitable positions. As of July 31, 2019, the Fund was concentrated in the financial services sector and had significant exposure to companies in the consumer discretionary, industrial, and information technology sectors.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	An investment in the Fund involves risk. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The Fund's principal risks are presented in alphabetical order to facilitate investors' ability to identify particular risks and compare them with the risks of other funds. Some or all of these risks may adversely affect the Fund's net asset value per share ("NAV"), trading price, yield, total return, and/or ability to meet its objective. There is no assurance that the Fund will achieve its investment objective. An investor may lose money by investing in the Fund. For more information about the risks of investing in the Fund, see the sections titled "Additional Information About the Funds' Risks" and "Additional Non-Principal Risk Information." Cash Redemption Risk. The Fund's investment strategy will require it to effect redemptions, in whole or in part, for cash. As a result, the Fund may pay out higher annual capital gain distributions and be less tax-efficient than if the in-kind redemption process was used exclusively. In addition, cash redemptions may incur higher brokerage costs than in-kind redemptions and these added costs may be borne by the Fund and negatively impact Fund performance. Cyber Security Risk. The Fund may be susceptible to operational and information security risks resulting from a breach in the Fund's cyber security, including cyber-attacks against the Fund, third-party service providers, market makers, Authorized Participants, or issuers of securities in which the Fund invests. A breach in cyber security, intentional or unintentional, may adversely impact the Fund in many ways, including, but not limited to, disruption of the Fund's operational capacity, loss of proprietary information, theft or corruption of data, denial-of-service attacks on websites or network resources, and the unauthorized release of confidential information. Derivatives Risk. Put and call options are referred to as "derivative" instruments since their values are based on, or derived from, an underlying reference asset, such as an index. Derivatives can be volatile, and a small investment in a derivative can have a large impact on the performance of the Fund as derivatives can result in losses in excess of the amount invested. The return on a derivative instrument may not correlate with the return of its underlying reference asset. Derivative instruments may be difficult to value and may be subject to wide swings in valuations caused by changes in the value of the underlying instrument. Other risks of investments in derivatives include risks that the transactions may result in losses that partially or completely offset gains in portfolio positions and risks that the derivative transaction may not be liquid. Derivative instruments may create economic leverage in the Fund, which magnifies the Fund's exposure to the underlying instrument. Dividend Paying Security Risk. Securities that pay high dividends as a group can fall out of favor with the market, causing these companies to underperform companies that do not pay high dividends. Also, companies owned by the Fund that have historically paid a dividend may reduce or discontinue their dividends, thus reducing the yield of the Fund. Equity Investing Risk. The values of equity securities could decline generally or could underperform other investments due to factors affecting a specific issuer, market or securities markets generally. Hedging Risk. Options used by the Fund to reduce volatility may not perform as intended. There can be no assurance that the Fund's option strategy will be effective. It may expose the Fund to losses, e.g., option premiums, to which it would not have otherwise been exposed if it only invested in U.S. government bonds or U.S. government bond ETFs. Further, the option strategy may not fully protect the Fund against declines in the value of its portfolio securities. Investment Risk. 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 government agency. When you sell your Shares, they could be worth less than what you paid for them. Large Capitalization Companies Risk. The Fund's investments in large capitalization companies (i.e., companies with more than $5 billion in capitalization) may underperform other segments of the market because large capitalization companies may be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes, and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion. Leveraging Risk. Certain of Fund's investments may expose the Fund to leverage, causing the Fund to be more volatile. Liquidity Risk. The Fund may purchase options and invest in other instruments that may be less liquid than other types of investments. The options purchased by the Fund may not always be liquid. This could have a negative effect on the Fund's ability to achieve its investment objective and may result in losses to Fund shareholders. Management Risk. The Fund is actively managed using proprietary investment strategies and processes. There can be no guarantee that the adviser's judgments about the attractiveness, value and potential appreciation of particular investments and strategies for the Fund will be correct or produce the desired results or that the Fund will achieve its investment objective. If the adviser fails to accurately evaluate market risk or appropriately react to current and developing market conditions, the Fund's share price may be adversely affected. The Fund is actively managed using proprietary investment strategies and processes. Market Events Risk. Turbulence in the financial markets and reduced liquidity in the equity markets may negatively affect issuers, which could have an adverse effect on the Fund. In addition, there is a risk that policy changes by the U.S. Government, Federal Reserve and/or other government actors, such as increasing interest rates, could cause increased volatility in financial markets and higher levels of Fund redemptions, which could have a negative impact on the Fund. In a declining stock market, stock prices for all companies (including those in the Fund's portfolio) may decline, regardless of their long-term prospects. Options Risk. The prices of options may change rapidly over time and do not necessarily move in tandem with the price of the underlying securities. Writing index call options reduces the Fund's ability to profit from increases in the value of the Fund's equity portfolio, and purchasing put options may result in the Fund's loss of premiums paid in the event that the put options expire unexercised. To the extent that the Fund reduces its put option holdings relative to the number of call options sold by the Fund, the Fund's ability to mitigate losses in the event of a market decline will be reduced. Portfolio Turnover Risk. Because the Fund "turns over" a portion of its options from time to time, the Fund will incur high levels of transaction costs from commissions or mark-ups in the bid/offer spread. Higher portfolio turnover may result in the Fund paying higher levels of transaction costs and may also result in a substantial amount of distributions from the Fund to be taxed as ordinary income, which may limit the tax efficiency of the Fund. Premium-Discount Risk. Shares may trade above (premium) or below (discount) their NAV. The market prices of Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of, and demand for, Shares on the Exchange. This risk is heightened in times of market volatility or periods of steep market declines. Secondary Market Trading Risk. Investors buying or selling Shares in the secondary market may pay brokerage commissions or other charges, which may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of Shares. Although the Shares are listed on the Exchange, there can be no assurance that an active or liquid trading market for them will develop or be maintained. In addition, trading in Shares on the Exchange may be halted. Sector Concentration Risk. To the extent that the Fund's investments are concentrated in a particular sector, the Fund may be susceptible to loss due to adverse occurrences affecting that sector. As of July 31, 2019, the Fund was concentrated in the financial services sector and had significant exposure to companies in the consumer discretionary, industrial, and information technology sectors. Consumer Discretionary Sector Risk. The success of consumer product manufacturers and retailers is tied closely to the performance of the overall domestic and international economy, interest rates, competitive and consumer confidence. Success depends heavily on disposable household income and consumer spending. Changes in demographics and consumer tastes can also affect the demand for, and success of, consumer products in the marketplace. Financial Services Sector Risk. Performance of companies in the financial services sector may be adversely impacted by many factors, including, among others, government regulations, economic conditions, credit rating downgrades, changes in interest rates, and decreased liquidity in credit markets. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted. Industrial Sector Risk. Issuers in the industrial sector are affected by supply and demand, both for their specific product or service and for industrial sector products in general. The products of such issuers may face obsolescence due to rapid technological developments and frequent new product introduction. Government regulations, world events, economic conditions and exchange rates affect the performance of companies in the industrial sector. Issuers in the industrial sector may be adversely affected by liability for environmental damage, product liability claims and exchange rates. The industrial sector may also be adversely affected by changes or trends in commodity prices, which may be influenced by unpredictable factors. Information Technology Sector Risk. Technology companies face intense competition, both domestically and internationally, which may have an adverse effect on profit margins. Technology companies may have limited product lines, markets, financial resources or personnel. The products of technology companies may face obsolescence due to rapid technological developments and frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Companies in the 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.
Risk Lose Money [Text]	rr_RiskLoseMoney	An investment in the Fund involves risk.
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 government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund's average annual total returns compare with those of a relevant index that provides a broad measure of market performance. All returns include the reinvestment of dividends and distributions. As always, please note that the Fund's past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available at www.cambriafunds.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund’s average annual total returns compare with those of a relevant index that provides a broad measure of market performance.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.cambriafunds.com.
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	As always, please note that the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	Total Annual Returns for Calendar Year Ended December 31
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	As of July 31, 2019, the Fund's year-to-date total return was 2.51%. Best and Worst Quarter Returns (for the period reflected in the bar chart above) Best: 5.59%, for the quarter ended 12/31/2018 Worst: -2.60%, for the quarter ended 3/31/2018
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns for the period ending December 31, 2018
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Average annual total returns are shown on a before- and after-tax basis for the Fund. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	Average annual total returns are shown on a before- and after-tax basis for the Fund. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.
Cambria Core Equity ETF \| Cambria Core Equity ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Management Fee:	rr_ManagementFeesOverAssets	1.05%
Distribution and/or Service (12b-1) fees:	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.18%
Total Annual Fund Operating Expenses:	rr_ExpensesOverAssets	1.23%
One Year:	rr_ExpenseExampleYear01	$ 125
Three Years:	rr_ExpenseExampleYear03	390
Five Years:	rr_ExpenseExampleYear05	676
Ten Years:	rr_ExpenseExampleYear10	$ 1,489
Annual Return 2018	rr_AnnualReturn2018	4.87%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date total return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jul. 31, 2019
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	2.51%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2018
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.59%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2018
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(2.60%)
Label	rr_AverageAnnualReturnLabel	Return Before Taxes
1 Year	rr_AverageAnnualReturnYear01	4.87%
Since Inception	rr_AverageAnnualReturnSinceInception	5.66%
Inception Date	rr_AverageAnnualReturnInceptionDate	May 23, 2017
Cambria Core Equity ETF \| S&P 500 Index
Prospectus [Line Items]	rr_ProspectusLineItems
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Reflects no deduction for fees, expenses or taxes
Label	rr_AverageAnnualReturnLabel	S&P 500 Index (Reflects no deduction for fees, expenses or taxes)
1 Year	rr_AverageAnnualReturnYear01	(4.38%)
Since Inception	rr_AverageAnnualReturnSinceInception	4.82%
Inception Date	rr_AverageAnnualReturnInceptionDate	May 23, 2017
Cambria Core Equity ETF \| Return After Taxes on Distributions \| Cambria Core Equity ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Label	rr_AverageAnnualReturnLabel	Return After Taxes on Distributions
1 Year	rr_AverageAnnualReturnYear01	4.54%
Since Inception	rr_AverageAnnualReturnSinceInception	5.32%
Inception Date	rr_AverageAnnualReturnInceptionDate	May 23, 2017
Cambria Core Equity ETF \| Return After Taxes on Distributions and Sale of Fund Shares \| Cambria Core Equity ETF
Prospectus [Line Items]	rr_ProspectusLineItems
Label	rr_AverageAnnualReturnLabel	Return After Taxes on Distributions and Sale of Fund Shares
1 Year	rr_AverageAnnualReturnYear01	3.29%
Since Inception	rr_AverageAnnualReturnSinceInception	4.49%
Inception Date	rr_AverageAnnualReturnInceptionDate	May 23, 2017

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Label Element Value

Cambria Global Momentum ETF

Prospectus [Line Items] rr_ProspectusLineItems

Risk/Return [Heading] rr_RiskReturnHeading Cambria Global Momentum ETF

Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE

Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Cambria Global Momentum ETF (the "Fund") seeks to preserve and grow capital from investments in the U.S. and foreign equity, fixed income, commodity and currency markets, independent of market direction.

Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES

Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold Shares. You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table.

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)

Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER

Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund may pay transaction costs, including commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund's performance. For the fiscal year ended April 30, 2019, the Fund's portfolio turnover rate was 204% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 204.00%

Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table.

Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE

Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The example also assumes that the Fund provides a return of 5% a year and that the operating expenses remain the same. The example does not reflect any brokerage commissions that you may pay on purchases and sales of Shares. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund is considered a "fund of funds" that seeks to achieve its investment objective by primarily investing in other exchange-traded funds (the "ETFs") and other exchange traded products ("ETPs") including, but not limited to, exchange-traded notes ("ETNs"), exchange traded currency trusts, closed-end funds, and real estate investment trusts (together, "Underlying Vehicles") that offer diversified exposure, including inverse exposure, to global regions (including emerging markets), countries, styles (i.e., market capitalization, value, growth, etc.) and sectors. The Fund will invest in Underlying Vehicles, including affiliated and unaffiliated ETPs, spanning all the major world asset and instrument classes including equities, bonds (including high yield bonds, which are commonly referred to as "junk bonds"), real estate, derivatives, commodities, and currencies.

The Fund's investment adviser, Cambria Investment Management, L.P. ("Cambria" or the "Adviser"), will actively manage the Fund's portfolio utilizing a quantitative strategy with risk management controls in an attempt to protect capital. Cambria's model combines momentum and trend factors to select Underlying Vehicles for the Fund. Quantitative screens exclude foreign issuers whose securities are highly restricted or illegal for U.S. persons to own, including due to the imposition of sanctions by the U.S. Government. The Fund looks to allocate to the top-performing assets based on absolute and relative momentum, typically measured over periods of less than two years.

Through Underlying Vehicles, the Fund may have exposure to companies in any industry and of any market capitalization. In addition to Underlying Vehicles, the Fund may invest up to 20% of its net assets directly in other securities and financial instruments, including futures, cash and cash equivalents. Under normal market conditions, the Fund expects to invest at least 40% of its net assets in securities of issuers located in at least three different countries (including the United States).

The Fund may sell a security when Cambria believes that the security is overvalued or better investment opportunities are available, to invest in cash and cash equivalents, or to meet redemptions. Cambria expects to rebalance to target allocations monthly. As a result, the Fund may experience high portfolio turnover.

• ETFs are registered investment companies whose shares are exchange-traded and give investors a proportional interest in the pool of securities and other assets held by the ETF.

• ETPs are exchange-traded equity securities whose value derives from an underlying asset or portfolio of assets, which may correlate to a benchmark, such as a commodity, currency, interest rate or index. ETFs are one type of ETP.

• ETNs are unsecured and unsubordinated debt securities whose value derives, in part, from an underlying asset or benchmark and, in part, from the credit quality of the issuer.

Risk [Heading] rr_RiskHeading PRINCIPAL RISKS

Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
An investment in the Fund involves risk, which includes risks the Fund may be subject to due to investments in Underlying Vehicles. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The Fund's principal risks are presented in alphabetical order to facilitate investors' ability to identify particular risks and compare them with the risks of other funds. Some or all of these risks may adversely affect the Fund's net asset value per share ("NAV"), trading price, yield, total return, and/or ability to meet its objective. There is no assurance that the Fund will achieve its investment objective. An investor may lose money by investing in the Fund. For more information about the risks of investing in the Fund, see the sections titled "Additional Information About the Funds' Risks" and "Additional Non-Principal Risk Information."

Cash Redemption Risk. The Fund's investment strategy may require it to effect redemptions, in whole or in part, for cash. As a result, the Fund may pay out higher annual capital gain distributions and be less tax-efficient than if the in-kind redemption process was used exclusively. In addition, cash redemptions may incur higher brokerage costs than in-kind redemptions and these added costs may be borne by the Fund and negatively impact Fund performance.

Commodity Investing Risk. Investing in commodity-related companies may subject the Fund to greater volatility than investments in traditional securities. The commodities markets have experienced periods of extreme volatility. Similar future market conditions may result in rapid and substantial valuation increases or decreases in the Fund's holdings.

Currency Strategies Risk. Currency exchange rates may fluctuate significantly over short periods of time and can be unpredictably affected by political developments or government intervention. Changes in currency exchange rates may affect the U.S. Dollar value of the Fund's investments.

Cyber Security Risk. The Fund may be susceptible to operational and information security risks resulting from a breach in the Fund's cyber security, including cyber-attacks against the Fund, third-party service providers, market makers, Authorized Participants, or issuers of securities in which the Fund invests. A breach in cyber security, intentional or unintentional, may adversely impact the Fund in many ways, including, but not limited to, disruption of the Fund's operational capacity, loss of proprietary information, theft or corruption of data, denial-of-service attacks on websites or network resources, and the unauthorized release of confidential information.

Derivatives Risk. Derivatives, such as futures, can be volatile, and a small investment in a derivative can have a large impact on the performance of the Fund as derivatives can result in losses in excess of the amount invested. Other risks of investments in derivatives include risks of default by the other party to the derivative transactions; risks that the transactions may result in losses that partially or completely offset gains in portfolio positions; and risks that the derivative transaction may not be liquid.

Emerging Markets Risk. Emerging market investments are subject to the same risks as foreign investments and to additional risks due to greater political and economic uncertainties as well as a relative lack of information about issuers in such markets. Securities of emerging market issuers may become illiquid and be subject to volatility and high transaction costs.

Equity Investing Risk. The values of equity securities could decline generally or could underperform other investments due to factors affecting a specific issuer, market or securities markets generally.

Exchange-Traded Funds and Exchange-Traded Products and Investment Companies Risk. The risks of investing in securities of ETFs, ETPs and investment companies typically reflect the risks of the types of instruments in which the underlying ETF, ETP or investment company invests. In addition, with such investments, the Fund bears its proportionate share of the fees and expenses of the underlying entity. As a result, the Fund's operating expenses may be higher and performance may be lower.

Exchange-Traded Notes Risk. Because ETNs are unsecured, unsubordinated debt securities, an investment in an ETN exposes the Fund to the risk that an ETN's issuer may be unable to pay. In addition, as with investments in other ETPs, the Fund will bear its proportionate share of the fees and expenses of the ETN, which may cause the Fund's operating expenses to be higher and its performance to be lower.

Fixed Income Risk. A decline in an issuer's credit rating and/or financial condition may cause such issuer's fixed income securities to decrease in value while experiencing increased volatility and investment risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may "call" (or repay) the security before its stated maturity, and the Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund's income. The market value of a fixed income security generally changes in response to changes in interest rates and may change quickly and without warning in response to issuer defaults and changes in issuer credit ratings.

Foreign Investment Risk. Returns on investments in foreign securities could be more volatile than, or trail the returns on, investments in U.S. securities. Exposures to foreign securities entail special risks, including risks due to: (i) differences in information available about foreign issuers; (ii) differences in investor protection standards in other jurisdictions; (iii) capital controls risks, including the risk of a foreign jurisdiction imposing restrictions on the ability to repatriate or transfer currency or other assets; (iv) political, diplomatic and economic risks; (v) regulatory risks; and (vi) foreign market and trading risks, including the costs of trading and risks of settlement in foreign jurisdictions. In addition, the Fund's investments in securities denominated in other currencies could decline due to changes in local currency relative to the value of the U.S. dollar, which may affect the Fund's returns.

Geographic Investment Risk. To the extent the Fund invests a significant portion of its assets in the securities of companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region.

Asia-Pacific Risk. Investments in securities of issuers in Asia-Pacific countries involve risks that are specific to the Asia-Pacific region, including certain legal, regulatory, political and economic risks. Certain Asia-Pacific countries have experienced expropriation and/or nationalization of assets, confiscatory taxation, political instability, armed conflict and social instability as a result of religious, ethnic, socio-economic and/or political unrest. Some economies in this region are dependent on a range of commodities, and are strongly affected by international commodity prices and particularly vulnerable to price changes for these products.

Europe Risk. The Economic and Monetary Union of the European Union ("EU") requires compliance with restrictions on inflation rates, deficits, interest rates, debt levels and fiscal and monetary controls, each of which may significantly affect every country in Europe. Decreasing imports or exports, changes in governmental or EU regulations on trade, changes in the exchange rate of the euro, the default or threat of default by an EU member country on its sovereign debt, and/or an economic recession in an EU member country may have a significant adverse effect on the economies of EU member countries and their trading partners. In addition, the United Kingdom has voted in a referendum to leave the EU. Although it remains unclear what the potential consequences of Brexit may be, the economies of Europe and the United Kingdom, as well as the broader global economy, could be significantly impacted by Brexit, which may result in lower economic growth and increased volatility and illiquidity across global markets.

High Yield Securities Risk. High yield securities and unrated securities of comparable credit quality are subject to the increased risk of an issuer's inability to meet principal and interest payment obligations. High yield securities are subject to a greater risk of default and investments in them are inherently speculative. The secondary markets in which high yield securities are traded may be less liquid and more volatile than the market for higher grade securities.

Interest Rate Risk. The market value of fixed income securities generally changes in response to changes in interest rates. As interest rates rise, the value of certain fixed income securities is likely to decrease. Similarly, if interest rates decline, the value of fixed income securities is likely to increase. Interest rate risk is generally lower for shorter-term investments and higher for longer-term investments. As of the date of this Prospectus, interest rates are near historic lows, but risks associated with rising interest rates are heightened given the Federal Reserve's recent interest rate hikes, which could signal an end to the historically low interest rate environment. To the extent that rates increase substantially and/or rapidly, the Fund may be subject to significant losses.

International Closed-Market Trading Risk. Because the Fund's investments may be traded in markets that are closed when the Exchange is open, there are likely to be deviations between the current pricing of an underlying investment and stale investment pricing (i.e., the last quote from its closed foreign market), resulting in premiums or discounts to NAV that may be greater than those experienced by other ETFs.

Investment Risk. 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 government agency. When you sell your Shares, they could be worth less than what you paid for them.

Large Capitalization Company Risk. The Fund's investments in large capitalization companies may underperform other segments of the market because they may be less responsive to competitive challenges and opportunities and unable to attain high growth rates during periods of economic expansion.

Leveraging Risk. Certain of Fund's investments may expose the Fund to leverage, causing the Fund's value to be more volatile.

Liquidity Risk. Liquidity risk exists when a particular investment is difficult to purchase or sell. A significant, rapid rise in interest rates may result in a period of volatility and increased redemptions if Fund securities become illiquid and are forced to sell the illiquid securities at disadvantageous times or prices. This could have a negative effect on the Fund's ability to achieve its investment objective and may result in losses to Fund shareholders.

Management Risk. The Fund is actively managed using proprietary investment strategies and processes. There can be no guarantee that these strategies and processes will be successful or that the Fund will achieve its investment objective.

Market Events Risk. Turbulence in the financial markets and reduced liquidity in the equity, credit and fixed-income markets may negatively affect issuers, which could have an adverse effect on the Fund. In addition, there is a risk that policy changes by the U.S. Government, Federal Reserve and/or other government actors, such as increasing interest rates, could cause increased volatility in financial markets and higher levels of Fund redemptions, which could have a negative impact on the Fund. In a declining stock market, stock prices for all companies (including those in the Fund's portfolio) may decline, regardless of their long-term prospects.

Momentum Investing Risk. The Fund employs a "momentum" style of investing that emphasizes investing in securities that have had higher recent price performance compared to other securities. This style of investing is subject to the risk that these securities may be more volatile than a broad cross-section of securities or that the returns on securities that have previously exhibited price momentum are less than returns on other styles of investing or the overall stock market. High momentum may also be a sign that the securities' prices have peaked. Momentum can turn quickly and cause significant variation from other types of investments. The Fund may experience significant losses if momentum stops, turns or otherwise behaves differently than predicted.

Portfolio Turnover Risk. The Fund's or an Underlying Vehicle's strategy may result in high portfolio turnover rates, which may increase the Fund's or an Underlying Vehicle's brokerage commission costs and negatively impact the Fund's performance. Such portfolio turnover also may generate net short-term capital gains.

Premium-Discount Risk. Shares may trade above (premium) or below (discount) their NAV. The market prices of Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of, and demand for, Shares on the Exchange. This risk is heightened in times of market volatility or periods of steep market declines.

Quantitative Security Selection Risk. Cambria uses quantitative techniques to generate investment decisions and its processes and stock selection, and the Fund may not perform as intended if it relies on erroneous or outdated data from one or more third parties. Errors in data used in the quantitative model may occur from time to time and may not be identified and/or corrected before having an adverse impact on the Fund and its shareholders.

Real Estate Investments Risk. The Fund is subject to the risks related to investments in real estate, including declines in the real estate market, decreases in property revenues, increases in interest rates, increases in property taxes and operating expenses, legal and regulatory changes, a lack of credit or capital, defaults by borrowers or tenants, environmental problems and natural disasters.

REIT Risk. In addition to the risks associated with the real estate industry, REITs are subject to additional risks, including those related to adverse governmental actions and the potential failure to qualify for tax-free pass through of income and exemption from registration as an investment company. REITs are dependent upon specialized management skills and may invest in relatively few properties, a small geographic area or a small number of property types. As a result, investments in REITs may be volatile. REITs are pooled investment vehicles with their own fees and expenses and the Fund will indirectly bear a proportionate share of those fees and expenses.

Secondary Market Trading Risk. Investors buying or selling Shares in the secondary market may pay brokerage commissions, which may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of Shares. Although the Shares are listed on the Exchange, there can be no assurance that an active or liquid trading market for them will develop or be maintained. In addition, trading in Shares on the Exchange may be halted.

Small and Medium Capitalization Company Risk. Investing in securities of small and medium capitalization companies involves greater risk than customarily is associated with investing in larger, more established companies. These companies' securities may be more volatile and less liquid than those of more established companies, and they may be more sensitive to market conditions.

Underlying Vehicle Counterparty and Leverage Risk. Through its investments in Underlying Vehicles the Fund may be indirectly exposed to additional risks. For example, if an Underlying Vehicle contracts with a counterparty, the Fund indirectly bears the risk that the counterparty fails to honor its obligations, causing the Underlying Vehicle, and therefore the Fund, to lose money and decline in value. Derivatives used by Underlying Vehicles may include leverage, allowing them to obtain the right to a return on stipulated capital that exceeds the amount paid or invested. Use of leverage is speculative and could magnify losses. Although certain Underlying Vehicles may segregate liquid assets to cover the market value of its obligations under the derivatives, this will not prevent losses of amounts in excess of the segregated assets. Other Underlying Vehicles may not employ any risk management procedures at all, leading to even greater losses. Due to the Fund's investments in Underlying Vehicles, the value of the Fund's Shares may be volatile.

Risk Lose Money [Text] rr_RiskLoseMoney An investment in the Fund involves risk

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 government agency.

Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE

Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund's average annual total returns compare with those of a relevant index that provides a broad measure of market performance. All returns include the reinvestment of dividends and distributions. As always, please note that the Fund's past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available at www.cambriafunds.com.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund’s average annual total returns compare with those of a relevant index that provides a broad measure of market performance.

Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.cambriafunds.com.

Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As always, please note that the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

Bar Chart [Heading] rr_BarChartHeading Total Annual Returns for Calendar Year Ended December 31

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
As of July 31, 2019, the Fund's year-to-date total return was 4.10%.

Best and Worst Quarter Returns (for the period reflected in the bar chart above)

Best: 6.36%, for the quarter ended 9/30/2017

Worst: -7.88%, for the quarter ended 12/31/2018

Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for the period ending December 31, 2018

Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate Average annual total returns are shown on a before- and after-tax basis for the Fund. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.

Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
Average annual total returns are shown on a before- and after-tax basis for the Fund. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.

Cambria Global Momentum ETF | Cambria Global Momentum ETF

Prospectus [Line Items] rr_ProspectusLineItems

Management Fee: rr_ManagementFeesOverAssets 0.59%

Distribution and/or Service (12b-1) fees: rr_DistributionAndService12b1FeesOverAssets none

Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.35%

Other Expenses: rr_OtherExpensesOverAssets none

Total Annual Fund Operating Expenses: rr_ExpensesOverAssets 0.94%

One Year: rr_ExpenseExampleYear01 $ 96

Three Years: rr_ExpenseExampleYear03 300

Five Years: rr_ExpenseExampleYear05 520

Ten Years: rr_ExpenseExampleYear10 $ 1,155

Annual Return 2015 rr_AnnualReturn2015 (8.51%)

Annual Return 2016 rr_AnnualReturn2016 4.31%

Annual Return 2017 rr_AnnualReturn2017 20.60%

Annual Return 2018 rr_AnnualReturn2018 (8.72%)

Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return

Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jul. 31, 2019

Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 4.10%

Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter

Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2017

Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.36%

Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter

Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018

Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.88%)

Label rr_AverageAnnualReturnLabel Return Before Taxes

1 Year rr_AverageAnnualReturnYear01 (8.72%)

Since Inception rr_AverageAnnualReturnSinceInception 1.55%

Inception Date rr_AverageAnnualReturnInceptionDate Nov. 03, 2014

Cambria Global Momentum ETF | S&P 500 Index

Prospectus [Line Items] rr_ProspectusLineItems

Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes

Label rr_AverageAnnualReturnLabel S&P 500 Index (Reflects no deduction for fees, expenses or taxes)

1 Year rr_AverageAnnualReturnYear01 (4.38%)

Since Inception rr_AverageAnnualReturnSinceInception 7.56%

Inception Date rr_AverageAnnualReturnInceptionDate Nov. 03, 2014

Cambria Global Momentum ETF | S&P Balanced Equity & Bond Moderate Index

Prospectus [Line Items] rr_ProspectusLineItems

Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes

Label rr_AverageAnnualReturnLabel S&P Balanced Equity & Bond Moderate Index (Reflects no deduction for fees, expenses or taxes)

1 Year rr_AverageAnnualReturnYear01 (1.44%)

Since Inception rr_AverageAnnualReturnSinceInception 4.91%

Inception Date rr_AverageAnnualReturnInceptionDate Nov. 03, 2014

Cambria Global Momentum ETF | Return After Taxes on Distributions | Cambria Global Momentum ETF

Prospectus [Line Items] rr_ProspectusLineItems

Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions

1 Year rr_AverageAnnualReturnYear01 (9.19%)

Since Inception rr_AverageAnnualReturnSinceInception 0.86%

Inception Date rr_AverageAnnualReturnInceptionDate Nov. 03, 2014

Cambria Global Momentum ETF | Return After Taxes on Distributions and Sale of Fund Shares | Cambria Global Momentum ETF

Prospectus [Line Items] rr_ProspectusLineItems

Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares

1 Year rr_AverageAnnualReturnYear01 (5.33%)

Since Inception rr_AverageAnnualReturnSinceInception 0.95%

Inception Date rr_AverageAnnualReturnInceptionDate Nov. 03, 2014

XML 19 R17.htm IDEA: XBRL DOCUMENT

Label

Element

Value

Objective, Primary [Text Block]

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Risk/Return [Heading]

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Cambria Global Asset Allocation ETF

Objective [Heading]

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INVESTMENT OBJECTIVE

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The Fund seeks income and capital appreciation.

Expense [Heading]

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FEES AND EXPENSES

Expense Narrative [Text Block]

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Operating Expenses Caption [Text]

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ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT YOU PAY EACH YEAR AS A PERCENTAGE OF THE VALUE OF YOUR INVESTMENT)

Portfolio Turnover [Heading]

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PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

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Portfolio Turnover, Rate

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2.00%

Expense Exchange Traded Fund Commissions [Text]

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You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table.

Expense Example [Heading]

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EXAMPLE

Expense Example Narrative [Text Block]

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Strategy [Heading]

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PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block]

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The Fund is designed to provide absolute positive returns with reduced downside volatility, manageable risk, and smaller drawdowns (i.e., peak-to-trough declines in performance) by identifying an investable portfolio of exchange-traded vehicles that provide diversified exposure to all of the major asset classes in the various regions, countries and sectors around the globe. Under normal market conditions, the Fund invests at least 80% of its total assets in affiliated and unaffiliated exchange-traded funds ("ETFs") and other exchange-traded products ("ETPs") (collectively, "Underlying Vehicles") that provide exposure to various (i) investment asset classes, including equity and fixed income securities, real estate, commodities, and currencies, and (ii) factors such as value, momentum, and trend investing. The Fund invests in Underlying Vehicles that seek exposure to undervalued markets, according to various valuation metrics, such as the cyclically adjusted price-to-earnings ratio, commonly known as the "CAPE Shiller P/E ratio, while seeking to avoid overvalued markets through the use of systematic quantitative screens. The Fund also invests in Underlying Vehicles with momentum and trend following strategies. Momentum and trend following strategies, both of which are based on quantitative and algorithmic models, attempt to (1) invest in assets when their prices are in an uptrend (i.e., prices are increasing over a specified time period) and/or increasing relative to the prices of other assets, and (2) sell assets when their prices are in a downtrend (i.e., prices are decreasing over a specified time period) and/or decreasing relative to the prices of other assets.

Under normal market conditions, the Fund's investment adviser, Cambria Investment Management, L.P. ("Cambria" or the "Adviser"), selects Underlying Vehicles that provide exposures of approximately 45% to equity securities, 45% to fixed income securities and 10% to other asset classes, such as commodities and currencies.

Under normal market conditions, Cambria allocates approximately 40% of the Fund's total assets to long positions in foreign companies' equity or debt securities or foreign currencies. The Fund defines foreign companies as those domiciled or listed and traded outside of the U.S. The Fund defines equity exposures to include Underlying Vehicles that track the performance of stock indices, closed-end funds, real estate investment trusts ("REITs"), exchange-traded currency trusts, common stock, preferred stock and convertible securities of issuers of any market capitalization. The Fund defines fixed income exposures to include Underlying Vehicles that track the performance of fixed income indices, exchange-traded notes, securities issued by the U.S. Government and its agencies, sovereign debt and corporate bonds of any credit quality, including high yield (or "junk") bonds. The Fund defines commodity and currency exposures to include Underlying Vehicles that track the performance of commodity and currency indices.

The Fund is considered a "fund of funds" that seeks to achieve its investment objective by primarily investing in Underlying Vehicles, including affiliated ETFs, that offer diversified exposure to all of the major asset classes in the various regions, countries, and sectors around the globe. The Fund may invest up to 20% of its net assets in instruments that are not Underlying Vehicle, but which Cambria believes will help the Fund achieve its investment objective, including futures, options, swap contracts, cash and cash equivalents, and money market funds.

Cambria has discretion to actively manage the Fund's portfolio in accordance with the Fund's investment objective. The Fund may sell a security when Cambria believes that the security is overvalued or better investment opportunities are available, to invest in cash and cash equivalents, or to meet redemptions. Cambria expects to rebalance to target allocations at least annually.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Under normal market conditions, the Fund invests at least 80% of its total assets in affiliated and unaffiliated exchange-traded funds ("ETFs") and other exchange-traded products ("ETPs") (collectively, "Underlying Vehicles") that provide exposure to various (i) investment asset classes, including equity and fixed income securities, real estate, commodities, and currencies, and (ii) factors such as value, momentum, and trend investing.

Risk [Heading]

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PRINCIPAL RISKS

Risk Narrative [Text Block]

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Cash Redemption Risk. The Fund's investment strategy may require it to effect redemptions, in whole or in part, for cash. As a result, the Fund may pay out higher annual capital gain distributions and be less tax-efficient than if the in-kind redemption process was used exclusively. In addition, cash redemptions may incur higher brokerage costs than in-kind redemptions and these added costs may be borne by the Fund and negatively impact Fund performance.

Commodity Investing Risk. Investing in commodity-related companies may subject the Fund to greater volatility than investments in traditional securities. The commodities markets have experienced periods of extreme volatility. Similar future market conditions may result in rapid and substantial valuation increases or decreases in the Fund's holdings.

Concentration Risk. To the extent that the Underlying Index is concentrated in a particular industry or group of industries, the Fund is also expected to be concentrated in that industry or group of industries. As a result, the Fund may be susceptible to loss due to adverse occurrences affecting that industry or group of industries.

Currency Strategies Risk. Currency exchange rates may fluctuate significantly over short periods of time and can be unpredictably affected by political developments or government intervention. Changes in currency exchange rates may affect the U.S. Dollar value of the Fund's investments.

Depositary Receipts Risk. The risks of investments in depositary receipts are substantially similar to the risks of investing directly in foreign securities. In addition, depositary receipts may not track the price of or may be less liquid than their underlying foreign securities, and the value of depositary receipts may change materially at times when the U.S. markets are not open for trading.

Derivatives Risk. Derivatives, such as futures, options, and swaps, can be volatile, and a small investment in a derivative can have a large impact on the performance of the Fund as derivatives can result in losses in excess of the amount invested. Other risks of investments in derivatives include risks of default by the other party to the derivative transactions; risks that the transactions may result in losses that partially or completely offset gains in portfolio positions; and risks that the derivative transaction may not be liquid.

Emerging Markets Risk. Emerging market investments are subject to the same risks as foreign investments and to additional risks due to greater political and economic uncertainties as well as a relative lack of information about companies in such markets. Securities traded on emerging markets are potentially illiquid and may be subject to volatility and high transaction costs.

Equity Investing Risk. The values of equity securities could decline generally or could underperform other investments. In addition, securities may decline in value due to factors affecting a specific issuer, market or securities markets generally.

Exchange-Traded Funds and Exchange-Traded Products and Investment Companies Risk. The risks of investing in securities of ETFs, ETPs and investment companies typically reflect the risks of the types of instruments in which the underlying ETF, ETP or investment company invests. In addition, with such investments, the Fund bears its proportionate share of the fees and expenses of the underlying entity. As a result, the Fund's operating expenses may be higher and performance may be lower. Through its investments in investment companies, the Fund may be indirectly exposed to derivatives and leverage; allowing them to obtain the right to a return on stipulated capital that exceeds the amount paid or invested. Use of leverage is speculative and could magnify losses.

Exchange-Traded Notes Risk. Because ETNs are unsecured, unsubordinated debt securities, an investment in an ETN exposes the Fund to the risk that an ETN's issuer may be unable to pay. In addition, as with investments in other ETPs, the Fund will bear its proportionate share of the fees and expenses of the ETN, which may cause the Fund's operating expenses to be higher and its performance to be lower.

Fixed Income Risk. A decline in an issuer's credit rating and/or financial condition may cause such issuer's fixed income securities to decrease in value while experiencing increased volatility and investment risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may "call" (or repay) the security before its stated maturity, and the Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund's income. The market value of a fixed income security generally changes in response to changes in interest rates and may change quickly and without warning in response to issuer defaults and changes in issuer credit ratings.

Foreign Investment Risk. Returns on investments in foreign securities could be more volatile than, or trail the returns on, investments in U.S. securities. Exposures to foreign securities entail special risks, including risks due to: (i) differences in information available about foreign issuers; (ii) differences in investor protection standards in other jurisdictions; (iii) capital controls risks, including the risk of a foreign jurisdiction imposing restrictions on the ability to repatriate or transfer currency or other assets; (iv) political, diplomatic and economic risks; (v) regulatory risks; and (vi) foreign market and trading risks, including the costs of trading and risks of settlement in foreign jurisdictions. In addition, the Fund's investments in securities denominated in other currencies could decline due to changes in local currency relative to the value of the U.S. dollar, which may affect the Fund's returns.

Geographic Investment Risk. To the extent the Fund invests a significant portion of its assets in the securities of companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region.

Asia-Pacific Risk. Investments in securities of issuers in Asia-Pacific countries involve risks that are specific to the Asia-Pacific region, including certain legal, regulatory, political and economic risks. Certain Asia-Pacific countries have experienced expropriation and/or nationalization of assets, confiscatory taxation, political instability, armed conflict and social instability as a result of religious, ethnic, socio-economic and/or political unrest. Some economies in this region are dependent on a range of commodities, and are strongly affected by international commodity prices and particularly vulnerable to price changes for these products.

Europe Risk. The Economic and Monetary Union of the European Union ("EU") requires compliance with restrictions on inflation rates, deficits, interest rates, debt levels and fiscal and monetary controls, each of which may significantly affect every country in Europe. Decreasing imports or exports, changes in governmental or EU regulations on trade, changes in the exchange rate of the euro, the default or threat of default by an EU member country on its sovereign debt, and/or an economic recession in an EU member country may have a significant adverse effect on the economies of EU member countries and their trading partners. In addition, the United Kingdom has voted in a referendum to leave the EU. Although it remains unclear what the potential consequences of Brexit may be, the economies of Europe and the United Kingdom, as well as the broader global economy, could be significantly impacted by Brexit, which may result in lower economic growth and increased volatility and illiquidity across global markets.

High Yield Securities Risk. High yield securities and unrated securities of comparable credit quality are subject to the increased risk of an issuer's inability to meet principal and interest payment obligations. High yield securities are subject to a greater risk of default and investments in them are inherently speculative. The secondary markets in which high yield securities are traded may be less liquid and more volatile than the market for higher grade securities.

Interest Rate Risk. The market value of fixed income securities generally changes in response to changes in interest rates. As interest rates rise, the value of certain fixed income securities is likely to decrease. Similarly, if interest rates decline, the value of fixed income securities is likely to increase. Interest rate risk is generally lower for shorter-term investments and higher for longer-term investments. As of the date of this Prospectus, interest rates are near historic lows, but risks associated with rising interest rates are heightened given the Federal Reserve's recent interest rate hikes, which could signal an end to the historically low interest rate environment. To the extent that rates increase substantially and/or rapidly, the Fund may be subject to significant losses.

International Closed-Market Trading Risk. Because the Fund's investments may be traded in markets that are closed when the Exchange is open, there are likely to be deviations between the current pricing of an underlying investment and stale investment pricing (i.e., the last quote from its closed foreign market), resulting in premiums or discounts to NAV that may be greater than those experienced by other ETFs.

Leveraging Risk. Certain of Fund's investments may expose the Fund to leverage, causing the Fund's value to be more volatile.

Liquidity Risk. Liquidity risk exists when a particular investment is difficult to purchase or sell. A significant, rapid rise in interest rates may result in a period of volatility and increased redemptions if Fund securities become illiquid and are forced to sell the illiquid securities at disadvantageous times or prices. This could have a negative effect on the Fund's ability to achieve its investment objective and may result in losses to Fund shareholders.

Management Risk. The Fund is actively managed using proprietary investment strategies and processes. There can be no guarantee that these strategies and processes will be successful or that the Fund will achieve its investment objective.

Market Events Risk. Turbulence in the financial markets and reduced liquidity in the equity, credit and fixed-income markets may negatively affect issuers, which could have an adverse effect on the Fund. In addition, there is a risk that policy changes by the U.S. Government and/or Federal Reserve, such as increasing interest rates, could cause increased volatility in financial markets and higher levels of Fund redemptions, which could have a negative impact on the Fund. In a declining stock market, stock prices for all companies (including those in the Fund's portfolio) may decline, regardless of their long-term prospects.

Momentum Investing Risk. The Underlying Index may identify securities that have had higher recent price performance compared to other securities. These securities may be more volatile than a broad cross-section of securities. High momentum may also be a sign that the securities' prices have peaked. Momentum can turn quickly and cause significant variation from other types of investments. The Fund may experience significant losses if momentum stops, turns or otherwise behaves differently than predicted.

Options Risk. The prices of options may change rapidly over time and do not necessarily move in tandem with the price of the underlying securities. Options may expire unexercised, causing the Fund to lose the premium paid for them.

Real Estate Investments Risk. The Fund is subject to the risks related to investments in real estate, including declines in the real estate market, decreases in property revenues, increases in interest rates, increases in property taxes and operating expenses, legal and regulatory changes, a lack of credit or capital, defaults by borrowers or tenants, environmental problems and natural disasters.

Small and Medium Capitalization Company Risk. Investing in securities of small and medium capitalization companies involves greater risk than customarily is associated with investing in larger, more established companies. These companies' securities may be more volatile and less liquid than those of more established companies. Often, small and medium capitalization companies and the industries in which they focus are still evolving and, as a result, they may be more sensitive to changing market conditions.

Sovereign Debt Securities Risk. Investments in sovereign debt obligations involve special risks not present in corporate debt obligations. The issuer of the sovereign debt or the authorities that control the repayment of the debt may be unable or unwilling to repay principal or interest when due, and the Fund may have limited recourse in the event of a default. During periods of economic uncertainty, the market prices of sovereign debt, and the Fund's NAV, may be more volatile than prices of U.S. debt obligations. In the past, certain non-U.S. markets have encountered difficulties in servicing their debt obligations, withheld payments of principal and interest and declared moratoria on the payment of principal and interest on their sovereign debts. These risks increase for lower-rated and high yield debt securities, as discussed in this Prospectus.

Swaps Contract Risk. Each swap exposes the Fund to counterparty risk when a counterparty to a financial instrument entered into by the Fund may become bankrupt or otherwise fail to perform its obligations. As a result, the Fund may experience delays in or be prevented from obtaining payments owed to it pursuant to a swap contract.

Value Investment Risk. Value investments are subject to the risk that their intrinsic value may never be realized by the market. Value investments tend to underperform in growth markets.

Risk Lose Money [Text]

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An investment in the Fund involves risk.

Risk Not Insured Depository Institution [Text]

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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 government agency

Bar Chart and Performance Table [Heading]

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PERFORMANCE

Performance Narrative [Text Block]

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The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund's average annual total returns compare with those of the former underlying index as well as a relevant index that provides a broad measure of market performance. All returns include the reinvestment of dividends and distributions. As always, please note that the Fund's past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available at www.cambriafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table indicate the risks of investing in the Fund by showing how the Fund’s average annual total returns compare with those of the former underlying index as well as a relevant index that provides a broad measure of market performance.

Performance Availability Website Address [Text]

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www.cambriafunds.com

Performance Past Does Not Indicate Future [Text]

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As always, please note that the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

Bar Chart [Heading]

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Total Annual Returns for Calendar Year Ended December 31

Bar Chart Closing [Text Block]

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As of July 31, 2019, the Fund's year-to-date total return was 10.37%.

Best and Worst Quarter Returns (for the period reflected in the bar chart above)

Best: 4.53%, for the quarter ended 9/30/2017

Worst: -6.08%, for the quarter ended 12/31/2018

Performance Table Heading

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Average Annual Total Returns for the period ending December 31, 2018

Performance Table Uses Highest Federal Rate

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Performance Table One Class of after Tax Shown [Text]

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Performance Table Closing [Text Block]

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Cambria Global Asset Allocation ETF | Cambria Global Asset Allocation ETF

Distribution and/or Service (12b-1) fees:

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Management Fee:

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none

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none

Acquired Fund Fees and Expenses

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0.34%

Other Expenses:

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none

Total Annual Fund Operating Expenses:

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0.34%

One Year:

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$ 35

Three Years:

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109

Five Years:

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191

Ten Years:

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$ 431

Annual Return 2015

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(3.86%)

Annual Return 2016

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8.64%

Annual Return 2017

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15.22%

Annual Return 2018

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(6.85%)

Year to Date Return, Label

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year-to-date total return

Bar Chart, Year to Date Return, Date

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Jul. 31, 2019

Bar Chart, Year to Date Return

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10.37%

Highest Quarterly Return, Label

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Best Quarter

Highest Quarterly Return, Date

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Sep. 30, 2017

Highest Quarterly Return

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4.53%

Lowest Quarterly Return, Label

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Worst Quarter

Lowest Quarterly Return, Date

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Dec. 31, 2018

Lowest Quarterly Return

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(6.08%)

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Return Before Taxes

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(6.85%)

^[1]

rr_AverageAnnualReturnSinceInception

2.62%

^[1]

Cambria Global Asset Allocation ETF | S&P 500 Index

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Dec. 09, 2014

Index No Deduction for Fees, Expenses, Taxes [Text]

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Reflects no deduction for fees, expenses or taxes

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S&P 500 Index (Reflects no deduction for fees, expenses or taxes)

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(4.38%)

^[1]

rr_AverageAnnualReturnSinceInception

7.14%

^[1]

Cambria Global Asset Allocation ETF | S&P Balanced Equity & Bond Moderate Index

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Dec. 09, 2014

Index No Deduction for Fees, Expenses, Taxes [Text]

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Reflects no deduction for fees, expenses or taxes

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S&P Balanced Equity & Bond Moderate Index (Reflects no deduction for fees, expenses or taxes)

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(1.44%)

^[1]

rr_AverageAnnualReturnSinceInception

5.10%

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Cambria Global Asset Allocation ETF | Return After Taxes on Distributions | Cambria Global Asset Allocation ETF

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Dec. 09, 2014

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rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

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(7.58%)

^[1]

rr_AverageAnnualReturnSinceInception

1.62%

^[1]

Cambria Global Asset Allocation ETF | Return After Taxes on Distributions and Sale of Fund Shares | Cambria Global Asset Allocation ETF

rr_AverageAnnualReturnInceptionDate

Dec. 09, 2014

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rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

rr_AverageAnnualReturnYear01

(4.05%)

^[1]

rr_AverageAnnualReturnSinceInception

1.65%

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Cambria Global Asset Allocation ETF | Cambria Global Asset Allocation Index

rr_AverageAnnualReturnInceptionDate

Dec. 09, 2014

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Cambria Global Asset Allocation Index (Reflects no deduction for fees, expenses or taxes)

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(7.69%)

^[1]

rr_AverageAnnualReturnSinceInception

0.98%

^[1]