485BPOS

      As filed with the Securities and Exchange Commission on May 15, 2012

================================================================================

                                           1933 Act Registration No. 333-171759
                                            1940 Act Registration No. 811-22519

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933                     [ ]
Pre-Effective Amendment No. __                                              [ ]
Post-Effective Amendment No. 12                                             [X]
                                     and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940             [ ]
Amendment No. 13                                                            [X]


                  FIRST TRUST EXCHANGE-TRADED ALPHADEX FUND II
               (Exact name of registrant as specified in charter)
                             120 East Liberty Drive
                            Wheaton, Illinois 60187
              (Address of Principal Executive Offices) (Zip Code)


       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (800) 621-1675

                       W. Scott Jardine, Esq., Secretary
                  First Trust Exchange-Traded AlphaDEX Fund II
                           First Trust Advisors L.P.
                             120 East Liberty Drive
                            Wheaton, Illinois 60187
                    (Name and Address of Agent for Service)

                                    Copy to:
                               Eric F. Fess, Esq.
                             Chapman and Cutler LLP
                             111 West Monroe Street
                            Chicago, Illinois 60603


It is proposed that this filing will become effective (check appropriate box):

[X] immediately upon filing pursuant to paragraph (b)
[ ] on ___________ pursuant to paragraph (b)
[ ] 60 days after filing pursuant to paragraph (a)(1)
[ ] on (date) pursuant to paragraph (a)(1)
[ ] 75 days after filing pursuant to paragraph (a)(2)
[ ] on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

[ ] this post-effective amendment designates a new effective date for a
    previously filed post-effective amendment.



      This Registration Statement relates to the First Trust Asia Pacific
Ex-Japan AlphaDEX(R) Fund, First Trust Europe AlphaDEX(R) Fund, First Trust
Latin America AlphaDEX(R) Fund, First Trust Brazil AlphaDEX(R) Fund, First Trust
China AlphaDEX(R) Fund, First Trust Japan AlphaDEX(R) Fund, First Trust South
Korea AlphaDEX(R) Fund, First Trust Developed Markets Ex-US AlphaDEX(R) Fund and
First Trust Emerging Markets AlphaDEX(R) Fund.




                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Registration Statement under Rule
485(b) under the Securities Act of 1933 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, duly authorized in the
City of Wheaton, and State of Illinois, on the 15th day of May, 2012.


                                   By: /s/ Mark R. Bradley
                                      -----------------------------------------
                                      Mark R. Bradley, President and Chief
                                      Executive Officer


      Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date indicated:



SIGNATURE                               TITLE                                 DATE
                                                                        
                                        President and Chief Executive         May 15, 2012
/s/ Mark R. Bradley                     Officer
-------------------------------------
    Mark R. Bradley

                                        Treasurer, Chief Financial Officer    May 15, 2012
/s/ James M. Dykas                      and Chief Accounting Officer
-------------------------------------
    James M. Dykas

                                                         )
James A. Bowen*                                  Trustee )
                                                         )
                                                         )
Richard E. Erickson*                             Trustee )
                                                         )
                                                         )
Thomas R. Kadlec*                                Trustee )                    BY: /s/ W. Scott Jardine
                                                         )                       -------------------------------
                                                         )                            W. Scott Jardine
Robert F. Keith*                                 Trustee )                            Attorney-In-Fact
                                                         )                            May 15, 2012
                                                         )
Niel B. Nielson*                                 Trustee )
                                                         )


*  Original powers of attorney authorizing James A. Bowen, W. Scott Jardine,
   Mark R. Bradley, Eric F. Fess and Kristi A. Maher to execute Registrant's
   Registration Statement, and Amendments thereto, for each of the trustees of
   the Registrant on whose behalf this Registration Statement is filed, are
   incorporated by reference herein.





                               INDEX TO EXHIBITS

(101) Risk/return summary in interactive data format

XML

First Trust Asia Pacific Ex-Japan AlphaDEX Fund

SUMMARY INFORMATION

INVESTMENT OBJECTIVE

The First Trust Asia Pacific Ex-Japan AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Asia Pacific Ex-Japan Index (the "Index").

FEES AND EXPENSES OF THE FUND

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	First Trust Asia Pacific Ex-Japan AlphaDEX Fund
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none

ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		First Trust Asia Pacific Ex-Japan AlphaDEX Fund
Management Fees		0.80%
Distribution and Service (12b-1) Fees	[1]	none
Other Expenses		none
Total Annual Fund Operating Expenses		0.80%

EXAMPLE

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
First Trust Asia Pacific Ex-Japan AlphaDEX Fund	82	301	547	1,252

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 49% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Asia Pacific Ex-Japan BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in the Asia Pacific region excluding Japan. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 98 securities from five countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

PRINCIPAL RISKS

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CASH TRANSACTIONS RISK. Unlike most exchange-traded funds, the Fund may effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional exchange-traded fund. Because the Fund may effect a portion of redemptions for cash, rather than in-kind distributions, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of Shares may result in capital gains or losses, and may also result in higher brokerage costs.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

REAL ESTATE INVESTMENT RISK. The Fund invests in companies in the real estate industry, including REITs. Therefore, the Fund is subject to the risks associated with investing in real estate, which may include, but are not limited to, fluctuations in the value of underlying properties; defaults by borrowers or tenants; market saturation; changes in general and local economic conditions; decreases in market rates for rents; increases in competition, property taxes, capital expenditures or operating expenses; and other economic, political or regulatory occurrences affecting companies in the real estate industry.

The Fund invests in real estate companies that may be adversely impacted by the downturn in the subprime mortgage lending market in the United States. Subprime loans have higher defaults and losses than prime loans. Subprime loans also have higher serious delinquency rates than prime loans. The downturn in the subprime mortgage lending market may have far-reaching consequences into many aspects and geographic regions of the real estate business, and consequently, the value of the Fund may decline in response to such developments.

ASIA PACIFIC RISK. The Fund invests in securities issued by companies operating in the Asia Pacific region. The Fund is more susceptible to the economic, market, regulatory, political, natural disasters and local risks of the Asia Pacific region than a fund that is more geographically diversified. The region has historically been highly dependent on global trade, with nations taking strong roles in both the importing and exporting of goods; such a relationship creates a risk with this dependency on global growth. The respective stock markets tend to have a larger prevalence of smaller companies that are inherently more volatile and less liquid than larger companies. Varying levels of accounting and disclosure standards, restrictions on foreign ownership, minority ownership rights, and corporate governance standards are also common for the region.

HONG KONG AND SOUTH KOREA RISK. The Fund invests heavily in companies operating in South Korea and Hong Kong. The South Korean economy is dependent on the economies of Asia and the United States as key trading partners. Reduction in spending by these economies on South Korean products and services or negative changes in any of these economies, mainly in China or Southeast Asia, may cause an adverse impact on the South Korean economy. Furthermore, South Korea's economy is also dependent on the economies of other Asian countries and can be significantly affected by currency fluctuations and increasing competition from Asia's other low-cost emerging economies. Also, the political tensions with North Korea could escalate and lead to further uncertainty in the political and economic climate on the Korean peninsula.

Hong Kong companies are subject to risks related to Hong Kong's political and economic environment and the volatility of and the concentration of real estate companies listed on the Hong Kong Stock Exchange. Because of Hong Kong's reversion to China, any increase in uncertainty as to the economic and political status of Hong Kong or a deterioration of the relationship between China and the United States, could have negative implications on stocks listed on the Hong Kong Stock Exchange. Securities prices on the Hong Kong Stock Exchange, and specifically the Hang Seng Index, can be highly volatile and are sensitive to developments in Hong Kong and China, as well as other world markets.

ANNUAL TOTAL RETURN

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Europe AlphaDEX Fund

SUMMARY INFORMATION

INVESTMENT OBJECTIVE

The First Trust Europe AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Europe Index (the "Index").

FEES AND EXPENSES OF THE FUND

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	First Trust Europe AlphaDEX Fund
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none

ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		First Trust Europe AlphaDEX Fund
Management Fees		0.80%
Distribution and Service (12b-1) Fees	[1]	none
Other Expenses		none
Total Annual Fund Operating Expenses		0.80%

EXAMPLE

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
First Trust Europe AlphaDEX Fund	82	301	547	1,252

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 27% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Europe BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in Europe. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 197 securities from 17 countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

PRINCIPAL RISKS

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

EUROPE RISK. The Fund invests in securities issued by companies operating in Europe. The Fund is therefore subject to certain risks associated specifically with Europe. A significant number of countries in Europe are member states in the European Union, and the member states no longer control their own monetary policies by directing independent interest rates for their currencies. In these member states, the authority to direct monetary policies, including money supply and official interest rates for the Euro, is exercised by the European Central Bank. Furthermore, the European sovereign debt crisis and the related austerity measures in certain countries have had, and continues to have, a significant negative impact on the economies of certain European countries and their future economic outlooks.

ANNUAL TOTAL RETURN

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Latin America AlphaDEX Fund

SUMMARY INFORMATION

INVESTMENT OBJECTIVE

The First Trust Latin America AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Latin America Index (the "Index").

FEES AND EXPENSES OF THE FUND

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	First Trust Latin America AlphaDEX Fund
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none

ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		First Trust Latin America AlphaDEX Fund
Management Fees		0.80%
Distribution and Service (12b-1) Fees	[1]	none
Other Expenses		none
Total Annual Fund Operating Expenses		0.80%

EXAMPLE

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
First Trust Latin America AlphaDEX Fund	82	301	547	1,252

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 54% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Latin America BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in Latin America. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 50 securities from four countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

PRINCIPAL RISKS

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CASH TRANSACTIONS RISK. Unlike most exchange-traded funds, the Fund may effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional exchange-traded fund. Because the Fund may effect a portion of redemptions for cash, rather than in-kind distributions, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of Shares may result in capital gains or losses, and may also result in higher brokerage costs.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

LATIN AMERICA RISK. The Fund invests in securities issued by companies operating in Latin America. The Fund is therefore subject to certain risks associated specifically with this region. The value of Fund Shares may be adversely affected by political, economic, and social instability; inadequate investor protection; changes in laws or regulations of countries within Latin America; international relations with other nations; natural disasters; corruption and military activity. The economies of many Latin American countries differ from the economies of more developed countries in many respects. Certain Latin American countries are highly dependent upon and may be affected by developments in the United States, Europe and other Latin American economies.

BRAZIL RISK. The Fund invests heavily in companies operating in Brazil. Brazil has experienced substantial economic instability resulting from, among other things, periods of very high inflation, persistent structural public sector deficits and significant devaluations of its currency leading also to a high degree of price volatility in both the Brazilian equity and foreign currency markets. Brazilian companies may also be adversely affected by high interest and unemployment rates, and are particularly sensitive to fluctuations in commodity prices. Brazilian securities may also be subject to restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like Brazil.

ANNUAL TOTAL RETURN

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Brazil AlphaDEX Fund

SUMMARY INFORMATION

INVESTMENT OBJECTIVE

The First Trust Brazil AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Brazil Index (the "Index").

FEES AND EXPENSES OF THE FUND

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	First Trust Brazil AlphaDEX Fund
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none

ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		First Trust Brazil AlphaDEX Fund
Management Fees		0.80%
Distribution and Service (12b-1) Fees	[1]	none
Other Expenses		none
Total Annual Fund Operating Expenses		0.80%

EXAMPLE

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
First Trust Brazil AlphaDEX Fund	82	301	547	1,252

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 46% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Brazil BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in Brazil. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 50 securities. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended June 30 and December 31. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

PRINCIPAL RISKS

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CASH TRANSACTIONS RISK. Unlike most exchange-traded funds, the Fund may effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional exchange-traded fund. Because the Fund may effect a portion of redemptions for cash, rather than in-kind distributions, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of Shares may result in capital gains or losses, and may also result in higher brokerage costs.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

BRAZIL RISK. The Fund invests in companies that are operating in Brazil. Brazil has experienced substantial economic instability resulting from, among other things, periods of very high inflation, persistent structural public sector deficits and significant devaluations of its currency leading also to a high degree of price volatility in both the Brazilian equity and foreign currency markets. Brazilian companies may also be adversely affected by high interest and unemployment rates, and are particularly sensitive to fluctuations in commodity prices. Brazilian securities may also be subject to restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like Brazil.

ANNUAL TOTAL RETURN

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust China AlphaDEX Fund

SUMMARY INFORMATION

INVESTMENT OBJECTIVE

The First Trust China AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined China Index (the "Index").

FEES AND EXPENSES OF THE FUND

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	First Trust China AlphaDEX Fund
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none

ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		First Trust China AlphaDEX Fund
Management Fees		0.80%
Distribution and Service (12b-1) Fees	[1]	none
Other Expenses		none
Total Annual Fund Operating Expenses		0.80%

EXAMPLE

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
First Trust China AlphaDEX Fund	82	301	547	1,252

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 60% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P China BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in China. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 49 securities. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended June 30 and December 31. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

PRINCIPAL RISKS

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

CHINA RISK. The Fund may invest in H shares, certain depositary receipts and U.S.-listed common stock of companies that are domiciled in China, including Hong Kong. Some Chinese companies are listed on both the Hong Kong Stock Exchange with H shares and the Shanghai Stock Exchange with A shares. Price differentials between H shares and A shares of the same company may be significant. Also, price fluctuations of A shares are limited to either 5% or 10% per trading day, while no such limitations exist for H shares. Therefore, H shares may be susceptible to greater price fluctuations. Investing in securities of companies in China involves additional risks, including, but not limited to, the economy of China differs, often unfavorably, from the U.S. economy in such respects as structure, general development, government involvement, wealth distribution, rate of inflation, growth rate, allocation of resources and capital reinvestment, among others; the central government has historically exercised substantial control over virtually every sector of the Chinese economy through administrative regulation and/or state ownership; and actions of the Chinese central and local government authorities continue to have a substantial effect on economic conditions in China. Furthermore, China's economy is dependent on the economies of other Asian countries and can be significantly affected by currency fluctuations and increasing competition from Asia's other low-cost emerging economies. Chinese securities may also be subject to greater restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like China.

ANNUAL TOTAL RETURN

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Japan AlphaDEX Fund

SUMMARY INFORMATION

INVESTMENT OBJECTIVE

The First Trust Japan AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Japan Index (the "Index").

FEES AND EXPENSES OF THE FUND

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	First Trust Japan AlphaDEX Fund
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none

ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		First Trust Japan AlphaDEX Fund
Management Fees		0.80%
Distribution and Service (12b-1) Fees	[1]	none
Other Expenses		none
Total Annual Fund Operating Expenses		0.80%

EXAMPLE

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
First Trust Japan AlphaDEX Fund	82	301	547	1,252

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 43% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Japan BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in Japan. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 100 securities. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended June 30 and December 31. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

PRINCIPAL RISKS

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

JAPAN RISK. The Fund invests in the stock of companies operating in Japan. Because Japan's economy and equity market share a strong correlation with the U.S. markets, the Japanese economy may be affected by economic problems in the U.S. Japan also has a growing economic relationship with China and other Southeast Asian countries, and thus Japan's economy may also be affected by economic, political or social instability in those countries. Despite a strengthening in the economic relationship between Japan and China, the countries' political relationship has at times been strained in recent years. Should political tension increase, it could adversely affect the economy and destabilize the region as a whole. Japan also remains heavily dependent on oil imports, and higher commodity prices could therefore have a negative impact on the economy. Japanese securities may also be subject to lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. Furthermore, the natural disasters that have impacted Japan and the ongoing recovery efforts have had a negative affect on Japan's economy, and may continue to do so.

ANNUAL TOTAL RETURN

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust South Korea AlphaDEX Fund

SUMMARY INFORMATION

INVESTMENT OBJECTIVE

The First Trust South Korea AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined South Korea Index (the "Index").

FEES AND EXPENSES OF THE FUND

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	First Trust South Korea AlphaDEX Fund
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none

ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		First Trust South Korea AlphaDEX Fund
Management Fees		0.80%
Distribution and Service (12b-1) Fees	[1]	none
Other Expenses		none
Total Annual Fund Operating Expenses		0.80%

EXAMPLE

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
First Trust South Korea AlphaDEX Fund	82	301	547	1,252

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 123% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P South Korea BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in South Korea. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 50 securities. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended June 30 and December 31. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

PRINCIPAL RISKS

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CASH TRANSACTIONS RISK. Unlike most exchange-traded funds, the Fund may effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional exchange-traded fund. Because the Fund may effect a portion of redemptions for cash, rather than in-kind distributions, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of Shares may result in capital gains or losses, and may also result in higher brokerage costs.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

SOUTH KOREA RISK. The Fund invests in the stock of companies that are domiciled in South Korea. The South Korean economy is dependent on the economies of Asia and the United States as key trading partners. Reduction in spending by these economies on South Korean products and services or negative changes in any of these economies, mainly in China or Southeast Asia, may cause an adverse impact on the South Korean economy. Furthermore, South Korea's economy is also dependent on the economies of other Asian countries and can be significantly affected by currency fluctuations and increasing competition from Asia's other low-cost emerging economies. Also, the political tensions with North Korea could escalate and lead to further uncertainty in the political and economic climate on the Korean peninsula. South Korean securities may also be subject to restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like South Korea.

ANNUAL TOTAL RETURN

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Developed Markets Ex-US AlphaDEX Fund

SUMMARY INFORMATION

INVESTMENT OBJECTIVE

The First Trust Developed Markets Ex-US AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Developed Markets Ex-US Index (the "Index").

FEES AND EXPENSES OF THE FUND

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	First Trust Developed Markets Ex-US AlphaDEX Fund
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none

ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		First Trust Developed Markets Ex-US AlphaDEX Fund
Management Fees		0.80%
Distribution and Service (12b-1) Fees	[1]	none
Other Expenses		none
Total Annual Fund Operating Expenses		0.80%

EXAMPLE

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
First Trust Developed Markets Ex-US AlphaDEX Fund	82	301	547	1,252

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 67% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Developed Markets Ex-US BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in developed markets excluding the United States. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 295 securities from 23 countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

PRINCIPAL RISKS

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

JAPAN RISK. The Fund invests in the stock of companies operating in Japan. Because Japan's economy and equity market share a strong correlation with the U.S. markets, the Japanese economy may be affected by economic problems in the U.S. Japan also has a growing economic relationship with China and other Southeast Asian countries, and thus Japan's economy may also be affected by economic, political or social instability in those countries. Despite a strengthening in the economic relationship between Japan and China, the countries' political relationship has at times been strained in recent years. Should political tension increase, it could adversely affect the economy and destabilize the region as a whole. Japan also remains heavily dependent on oil imports, and higher commodity prices could therefore have a negative impact on the economy. Japanese securities may also be subject to lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. Furthermore, the natural disasters that have impacted Japan and the ongoing recovery efforts have had a negative affect on Japan's economy, and may continue to do so.

ANNUAL TOTAL RETURN

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Emerging Markets AlphaDEX Fund

SUMMARY INFORMATION

INVESTMENT OBJECTIVE

The First Trust Emerging Markets AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Emerging Markets Index (the "Index").

FEES AND EXPENSES OF THE FUND

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	First Trust Emerging Markets AlphaDEX Fund
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none

ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		First Trust Emerging Markets AlphaDEX Fund
Management Fees		0.80%
Distribution and Service (12b-1) Fees	[1]	none
Other Expenses		none
Total Annual Fund Operating Expenses		0.80%

EXAMPLE

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
First Trust Emerging Markets AlphaDEX Fund	82	301	547	1,252

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 56% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Emerging Markets BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in emerging markets. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 148 securities from 17 countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

PRINCIPAL RISKS

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CHINA RISK. The Fund may invest in H shares, certain depositary receipts and U.S.-listed common stock of companies that are domiciled in China, including Hong Kong. Some Chinese companies are listed on both the Hong Kong Stock Exchange with H shares and the Shanghai Stock Exchange with A shares. Price differentials between H shares and A shares of the same company may be significant. Also, price fluctuations of A shares are limited to either 5% or 10% per trading day, while no such limitations exist for H shares. Therefore, H shares may be susceptible to greater price fluctuations. Investing in securities of companies in China involves additional risks, including, but not limited to, the economy of China differs, often unfavorably, from the U.S. economy in such respects as structure, general development, government involvement, wealth distribution, rate of inflation, growth rate, allocation of resources and capital reinvestment, among others; the central government has historically exercised substantial control over virtually every sector of the Chinese economy through administrative regulation and/or state ownership; and actions of the Chinese central and local government authorities continue to have a substantial effect on economic conditions in China. Furthermore, China's economy is dependent on the economies of other Asian countries and can be significantly affected by currency fluctuations and increasing competition from Asia's other low-cost emerging economies. Chinese securities may also be subject to greater restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like China.

BRAZIL RISK. The Fund invests in companies that are operating in Brazil. Brazil has experienced substantial economic instability resulting from, among other things, periods of very high inflation, persistent structural public sector deficits and significant devaluations of its currency leading also to a high degree of price volatility in both the Brazilian equity and foreign currency markets. Brazilian companies may also be adversely affected by high interest and unemployment rates, and are particularly sensitive to fluctuations in commodity prices. Brazilian securities may also be subject to restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like Brazil.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

ANNUAL TOTAL RETURN

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.

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First Trust Exchange-Traded AlphaDEX Fund II

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First Trust Asia Pacific Ex-Japan AlphaDEX Fund

Risk/Return:

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SUMMARY INFORMATION

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INVESTMENT OBJECTIVE

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The First Trust Asia Pacific Ex-Japan AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Asia Pacific Ex-Japan Index (the "Index").

Expense [Heading]

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FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

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The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

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SHAREHOLDER FEES (fees paid directly from your investment)

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ANNUAL FUND OPERATING EXPENSES (Expenses that you pay each year as a percentage of the value of your investment)

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PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

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The Fund pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 49% of the average value of its portfolio.

Expense Example [Heading]

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EXAMPLE

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. 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 will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Asia Pacific Ex-Japan BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in the Asia Pacific region excluding Japan. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 98 securities from five countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CASH TRANSACTIONS RISK. Unlike most exchange-traded funds, the Fund may effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional exchange-traded fund. Because the Fund may effect a portion of redemptions for cash, rather than in-kind distributions, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of Shares may result in capital gains or losses, and may also result in higher brokerage costs.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

REAL ESTATE INVESTMENT RISK. The Fund invests in companies in the real estate industry, including REITs. Therefore, the Fund is subject to the risks associated with investing in real estate, which may include, but are not limited to, fluctuations in the value of underlying properties; defaults by borrowers or tenants; market saturation; changes in general and local economic conditions; decreases in market rates for rents; increases in competition, property taxes, capital expenditures or operating expenses; and other economic, political or regulatory occurrences affecting companies in the real estate industry.

The Fund invests in real estate companies that may be adversely impacted by the downturn in the subprime mortgage lending market in the United States. Subprime loans have higher defaults and losses than prime loans. Subprime loans also have higher serious delinquency rates than prime loans. The downturn in the subprime mortgage lending market may have far-reaching consequences into many aspects and geographic regions of the real estate business, and consequently, the value of the Fund may decline in response to such developments.

ASIA PACIFIC RISK. The Fund invests in securities issued by companies operating in the Asia Pacific region. The Fund is more susceptible to the economic, market, regulatory, political, natural disasters and local risks of the Asia Pacific region than a fund that is more geographically diversified. The region has historically been highly dependent on global trade, with nations taking strong roles in both the importing and exporting of goods; such a relationship creates a risk with this dependency on global growth. The respective stock markets tend to have a larger prevalence of smaller companies that are inherently more volatile and less liquid than larger companies. Varying levels of accounting and disclosure standards, restrictions on foreign ownership, minority ownership rights, and corporate governance standards are also common for the region.

HONG KONG AND SOUTH KOREA RISK. The Fund invests heavily in companies operating in South Korea and Hong Kong. The South Korean economy is dependent on the economies of Asia and the United States as key trading partners. Reduction in spending by these economies on South Korean products and services or negative changes in any of these economies, mainly in China or Southeast Asia, may cause an adverse impact on the South Korean economy. Furthermore, South Korea's economy is also dependent on the economies of other Asian countries and can be significantly affected by currency fluctuations and increasing competition from Asia's other low-cost emerging economies. Also, the political tensions with North Korea could escalate and lead to further uncertainty in the political and economic climate on the Korean peninsula.

Hong Kong companies are subject to risks related to Hong Kong's political and economic environment and the volatility of and the concentration of real estate companies listed on the Hong Kong Stock Exchange. Because of Hong Kong's reversion to China, any increase in uncertainty as to the economic and political status of Hong Kong or a deterioration of the relationship between China and the United States, could have negative implications on stocks listed on the Hong Kong Stock Exchange. Securities prices on the Hong Kong Stock Exchange, and specifically the Hang Seng Index, can be highly volatile and are sensitive to developments in Hong Kong and China, as well as other world markets.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

ANNUAL TOTAL RETURN

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Asia Pacific Ex-Japan AlphaDEX Fund | First Trust Asia Pacific Ex-Japan AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

301

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

547

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,252

First Trust Europe AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY INFORMATION

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The First Trust Europe AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Europe Index (the "Index").

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

SHAREHOLDER FEES (fees paid directly from your investment)

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 pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 27% of the average value of its portfolio.

Expense Example [Heading]

rr_ExpenseExampleHeading

EXAMPLE

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. 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 will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Europe BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in Europe. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 197 securities from 17 countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

EUROPE RISK. The Fund invests in securities issued by companies operating in Europe. The Fund is therefore subject to certain risks associated specifically with Europe. A significant number of countries in Europe are member states in the European Union, and the member states no longer control their own monetary policies by directing independent interest rates for their currencies. In these member states, the authority to direct monetary policies, including money supply and official interest rates for the Euro, is exercised by the European Central Bank. Furthermore, the European sovereign debt crisis and the related austerity measures in certain countries have had, and continues to have, a significant negative impact on the economies of certain European countries and their future economic outlooks.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

ANNUAL TOTAL RETURN

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Europe AlphaDEX Fund | First Trust Europe AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

301

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

547

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,252

First Trust Latin America AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY INFORMATION

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The First Trust Latin America AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Latin America Index (the "Index").

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

SHAREHOLDER FEES (fees paid directly from your investment)

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 pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 54% of the average value of its portfolio.

Expense Example [Heading]

rr_ExpenseExampleHeading

EXAMPLE

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. 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 will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Latin America BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in Latin America. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 50 securities from four countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CASH TRANSACTIONS RISK. Unlike most exchange-traded funds, the Fund may effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional exchange-traded fund. Because the Fund may effect a portion of redemptions for cash, rather than in-kind distributions, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of Shares may result in capital gains or losses, and may also result in higher brokerage costs.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

LATIN AMERICA RISK. The Fund invests in securities issued by companies operating in Latin America. The Fund is therefore subject to certain risks associated specifically with this region. The value of Fund Shares may be adversely affected by political, economic, and social instability; inadequate investor protection; changes in laws or regulations of countries within Latin America; international relations with other nations; natural disasters; corruption and military activity. The economies of many Latin American countries differ from the economies of more developed countries in many respects. Certain Latin American countries are highly dependent upon and may be affected by developments in the United States, Europe and other Latin American economies.

BRAZIL RISK. The Fund invests heavily in companies operating in Brazil. Brazil has experienced substantial economic instability resulting from, among other things, periods of very high inflation, persistent structural public sector deficits and significant devaluations of its currency leading also to a high degree of price volatility in both the Brazilian equity and foreign currency markets. Brazilian companies may also be adversely affected by high interest and unemployment rates, and are particularly sensitive to fluctuations in commodity prices. Brazilian securities may also be subject to restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like Brazil.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

ANNUAL TOTAL RETURN

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Latin America AlphaDEX Fund | First Trust Latin America AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

301

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

547

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,252

First Trust Brazil AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY INFORMATION

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The First Trust Brazil AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Brazil Index (the "Index").

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

SHAREHOLDER FEES (fees paid directly from your investment)

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 pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 46% of the average value of its portfolio.

Expense Example [Heading]

rr_ExpenseExampleHeading

EXAMPLE

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. 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 will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Brazil BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in Brazil. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 50 securities. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended June 30 and December 31. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CASH TRANSACTIONS RISK. Unlike most exchange-traded funds, the Fund may effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional exchange-traded fund. Because the Fund may effect a portion of redemptions for cash, rather than in-kind distributions, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of Shares may result in capital gains or losses, and may also result in higher brokerage costs.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

BRAZIL RISK. The Fund invests in companies that are operating in Brazil. Brazil has experienced substantial economic instability resulting from, among other things, periods of very high inflation, persistent structural public sector deficits and significant devaluations of its currency leading also to a high degree of price volatility in both the Brazilian equity and foreign currency markets. Brazilian companies may also be adversely affected by high interest and unemployment rates, and are particularly sensitive to fluctuations in commodity prices. Brazilian securities may also be subject to restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like Brazil.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

ANNUAL TOTAL RETURN

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Brazil AlphaDEX Fund | First Trust Brazil AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

301

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

547

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,252

First Trust China AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY INFORMATION

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The First Trust China AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined China Index (the "Index").

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

SHAREHOLDER FEES (fees paid directly from your investment)

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 pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 60% of the average value of its portfolio.

Expense Example [Heading]

rr_ExpenseExampleHeading

EXAMPLE

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. 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 will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P China BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in China. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 49 securities. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended June 30 and December 31. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

CHINA RISK. The Fund may invest in H shares, certain depositary receipts and U.S.-listed common stock of companies that are domiciled in China, including Hong Kong. Some Chinese companies are listed on both the Hong Kong Stock Exchange with H shares and the Shanghai Stock Exchange with A shares. Price differentials between H shares and A shares of the same company may be significant. Also, price fluctuations of A shares are limited to either 5% or 10% per trading day, while no such limitations exist for H shares. Therefore, H shares may be susceptible to greater price fluctuations. Investing in securities of companies in China involves additional risks, including, but not limited to, the economy of China differs, often unfavorably, from the U.S. economy in such respects as structure, general development, government involvement, wealth distribution, rate of inflation, growth rate, allocation of resources and capital reinvestment, among others; the central government has historically exercised substantial control over virtually every sector of the Chinese economy through administrative regulation and/or state ownership; and actions of the Chinese central and local government authorities continue to have a substantial effect on economic conditions in China. Furthermore, China's economy is dependent on the economies of other Asian countries and can be significantly affected by currency fluctuations and increasing competition from Asia's other low-cost emerging economies. Chinese securities may also be subject to greater restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like China.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

ANNUAL TOTAL RETURN

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust China AlphaDEX Fund | First Trust China AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

301

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

547

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,252

First Trust Japan AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY INFORMATION

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The First Trust Japan AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Japan Index (the "Index").

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

SHAREHOLDER FEES (fees paid directly from your investment)

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 pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 43% of the average value of its portfolio.

Expense Example [Heading]

rr_ExpenseExampleHeading

EXAMPLE

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. 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 will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Japan BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in Japan. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 100 securities. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended June 30 and December 31. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

JAPAN RISK. The Fund invests in the stock of companies operating in Japan. Because Japan's economy and equity market share a strong correlation with the U.S. markets, the Japanese economy may be affected by economic problems in the U.S. Japan also has a growing economic relationship with China and other Southeast Asian countries, and thus Japan's economy may also be affected by economic, political or social instability in those countries. Despite a strengthening in the economic relationship between Japan and China, the countries' political relationship has at times been strained in recent years. Should political tension increase, it could adversely affect the economy and destabilize the region as a whole. Japan also remains heavily dependent on oil imports, and higher commodity prices could therefore have a negative impact on the economy. Japanese securities may also be subject to lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. Furthermore, the natural disasters that have impacted Japan and the ongoing recovery efforts have had a negative affect on Japan's economy, and may continue to do so.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

ANNUAL TOTAL RETURN

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Japan AlphaDEX Fund | First Trust Japan AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

301

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

547

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,252

First Trust South Korea AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY INFORMATION

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The First Trust South Korea AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined South Korea Index (the "Index").

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

SHAREHOLDER FEES (fees paid directly from your investment)

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 pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 123% of the average value of its portfolio.

Expense Example [Heading]

rr_ExpenseExampleHeading

EXAMPLE

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. 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 will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P South Korea BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in South Korea. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 50 securities. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended June 30 and December 31. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CASH TRANSACTIONS RISK. Unlike most exchange-traded funds, the Fund may effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional exchange-traded fund. Because the Fund may effect a portion of redemptions for cash, rather than in-kind distributions, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of Shares may result in capital gains or losses, and may also result in higher brokerage costs.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

SOUTH KOREA RISK. The Fund invests in the stock of companies that are domiciled in South Korea. The South Korean economy is dependent on the economies of Asia and the United States as key trading partners. Reduction in spending by these economies on South Korean products and services or negative changes in any of these economies, mainly in China or Southeast Asia, may cause an adverse impact on the South Korean economy. Furthermore, South Korea's economy is also dependent on the economies of other Asian countries and can be significantly affected by currency fluctuations and increasing competition from Asia's other low-cost emerging economies. Also, the political tensions with North Korea could escalate and lead to further uncertainty in the political and economic climate on the Korean peninsula. South Korean securities may also be subject to restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like South Korea.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

ANNUAL TOTAL RETURN

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust South Korea AlphaDEX Fund | First Trust South Korea AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

301

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

547

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,252

First Trust Developed Markets Ex-US AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY INFORMATION

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The First Trust Developed Markets Ex-US AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Developed Markets Ex-US Index (the "Index").

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

SHAREHOLDER FEES (fees paid directly from your investment)

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 pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 67% of the average value of its portfolio.

Expense Example [Heading]

rr_ExpenseExampleHeading

EXAMPLE

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. 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 will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Developed Markets Ex-US BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in developed markets excluding the United States. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 295 securities from 23 countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

JAPAN RISK. The Fund invests in the stock of companies operating in Japan. Because Japan's economy and equity market share a strong correlation with the U.S. markets, the Japanese economy may be affected by economic problems in the U.S. Japan also has a growing economic relationship with China and other Southeast Asian countries, and thus Japan's economy may also be affected by economic, political or social instability in those countries. Despite a strengthening in the economic relationship between Japan and China, the countries' political relationship has at times been strained in recent years. Should political tension increase, it could adversely affect the economy and destabilize the region as a whole. Japan also remains heavily dependent on oil imports, and higher commodity prices could therefore have a negative impact on the economy. Japanese securities may also be subject to lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. Furthermore, the natural disasters that have impacted Japan and the ongoing recovery efforts have had a negative affect on Japan's economy, and may continue to do so.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

ANNUAL TOTAL RETURN

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Developed Markets Ex-US AlphaDEX Fund | First Trust Developed Markets Ex-US AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

301

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

547

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,252

First Trust Emerging Markets AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY INFORMATION

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The First Trust Emerging Markets AlphaDEX(R) Fund (the "Fund") seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of an equity index called the Defined Emerging Markets Index (the "Index").

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold Shares of the Fund. Investors purchasing and selling Shares may be subject to costs (including customary brokerage commissions) charged by their broker.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

SHAREHOLDER FEES (fees paid directly from your investment)

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 pays transaction costs, such as 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 Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the fiscal period April 18, 2011 (inception) through December 31, 2011, the Fund's portfolio turnover rate was 56% of the average value of its portfolio.

Expense Example [Heading]

rr_ExpenseExampleHeading

EXAMPLE

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling Shares of the Fund in the secondary market.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then you retain the Shares or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's annual operating expenses remain at current levels until April 30, 2013 and thereafter at 1.05% to represent the imposition of the 12b-1 fee of 0.25% per annum of the Fund's average daily net assets. 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 will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in stocks that comprise the Index. The Fund, using an "indexing" investment approach, attempts to replicate, before fees and expenses, the performance of the Index. First Trust seeks a correlation of 0.95 or better (before fees and expenses) between the Fund's performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. First Trust will regularly monitor the Fund's tracking accuracy and will seek to maintain an appropriate correlation.

The Index is in the "Defined Index Series," a family of custom enhanced indices developed, maintained and sponsored by Standard & Poor's Financial Services LLC ("S&P" or the "Index Provider"). The Index is a modified equal-dollar weighted index designed by S&P to objectively identify and select stocks from the S&P Emerging Markets BMI Index (the "Base Index") that may generate positive alpha relative to traditional passive-style indices through the use of the AlphaDEX(R) selection methodology. The Base Index is a comprehensive, rules-based index designed to measure stock market performance in emerging markets. The Base Index covers all publicly listed equities with float adjusted market values of $100 million or more and annual dollar value traded of at least $50 million. Alpha is an indication of how much an investment outperforms or underperforms on a risk-adjusted basis relative to its benchmark. As of March 31, 2012, the Index was comprised of 148 securities from 17 countries. The Index is rebalanced and reconstituted as of the last business day of the semi-annual periods ended March 31 and September 30. Changes to the Index will be effective at the open of trading on the ninth business day of the following month.

The Fund intends to invest entirely in the Index; however, there may also be instances in which the Fund may be overweighted in certain stocks in the Index, purchase securities not in the Index that are appropriate to substitute for certain securities in the Index or utilize various combinations of the above techniques in seeking to track the Index.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

MARKET RISK. Market risk is the risk that a particular stock owned by the Fund, Shares of the Fund or stocks in general may fall in value. Shares are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in stock prices. Overall stock values could decline generally or could underperform other investments.

NON-CORRELATION RISK. The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Index, and may incur costs in buying and selling securities, especially when rebalancing the Fund's portfolio holdings to reflect changes in the composition of the Index. In addition, the Fund's portfolio holdings may not exactly replicate the securities included in the Index or the ratios between the securities included in the Index.

REPLICATION MANAGEMENT RISK. The Fund is exposed to additional market risk due to its policy of investing principally in the securities included in the Index. As a result of this policy, securities held by the Fund will generally not be bought or sold in response to market fluctuations, and the securities may be issued by companies concentrated in a particular industry. Therefore, the Fund will generally not sell a stock because the stock's issuer is in financial trouble, unless that stock is removed or is anticipated to be removed from the Index.

NON-DIVERSIFICATION RISK. The Fund is classified as "non-diversified" under the Investment Company Act of 1940, as amended (the "1940 Act"). As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended (the "Code"). The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly concentrated in certain issuers.

NON-U.S. SECURITIES AND EMERGING MARKETS RISK. The Fund invests in securities of non-U.S. issuers, including non-U.S. dollar-denominated securities traded outside of the United States and U.S. dollar-denominated securities of non-U.S. issuers traded in the United States. Such securities are subject to higher volatility than securities of domestic issuers due to possible adverse political, social or economic developments; restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards; and less government supervision and regulation of exchanges in foreign countries. These risks may be heightened for securities of companies located in, or with significant operations in, emerging market countries.

CHINA RISK. The Fund may invest in H shares, certain depositary receipts and U.S.-listed common stock of companies that are domiciled in China, including Hong Kong. Some Chinese companies are listed on both the Hong Kong Stock Exchange with H shares and the Shanghai Stock Exchange with A shares. Price differentials between H shares and A shares of the same company may be significant. Also, price fluctuations of A shares are limited to either 5% or 10% per trading day, while no such limitations exist for H shares. Therefore, H shares may be susceptible to greater price fluctuations. Investing in securities of companies in China involves additional risks, including, but not limited to, the economy of China differs, often unfavorably, from the U.S. economy in such respects as structure, general development, government involvement, wealth distribution, rate of inflation, growth rate, allocation of resources and capital reinvestment, among others; the central government has historically exercised substantial control over virtually every sector of the Chinese economy through administrative regulation and/or state ownership; and actions of the Chinese central and local government authorities continue to have a substantial effect on economic conditions in China. Furthermore, China's economy is dependent on the economies of other Asian countries and can be significantly affected by currency fluctuations and increasing competition from Asia's other low-cost emerging economies. Chinese securities may also be subject to greater restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like China.

BRAZIL RISK. The Fund invests in companies that are operating in Brazil. Brazil has experienced substantial economic instability resulting from, among other things, periods of very high inflation, persistent structural public sector deficits and significant devaluations of its currency leading also to a high degree of price volatility in both the Brazilian equity and foreign currency markets. Brazilian companies may also be adversely affected by high interest and unemployment rates, and are particularly sensitive to fluctuations in commodity prices. Brazilian securities may also be subject to restrictions on foreign investment or exchange of securities; lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States. These risks may be heightened for securities of companies located in, or with significant operations in, an emerging market country like Brazil.

CURRENCY RISK. Because the Fund's NAV is determined on the basis of U.S. dollars and the Fund invests in foreign securities, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

ANNUAL TOTAL RETURN

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund has not yet operated for a full calendar year and, therefore, performance information is not included in this section of the Prospectus. See "Total Return Information" for performance information regarding the Fund.

First Trust Emerging Markets AlphaDEX Fund | First Trust Emerging Markets AlphaDEX Fund

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

301

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

547

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,252

[1] Although the Fund has adopted a 12b-1 plan that permits it to pay up to 0.25% per annum, it will not pay 12b-1 fees at any time before April 30, 2013.