485BPOS

As filed with the U.S. Securities and Exchange Commission on January 18, 2012

Securities Act File No. 333-92935

Investment Company Act File No. 811-09729

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 690	x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940 x

Amendment No. 690

(Check appropriate box or boxes)

iShares Trust

(Exact Name of Registrant as Specified in Charter)

c/o State Street Bank and Trust Company

200 Clarendon Street

Boston, MA 02116

(Address of Principal Executive Office)(Zip Code)

Registrant’s Telephone Number, including Area Code (415) 670-2000

The Corporation Trust Company

1209 Orange Street

Wilmington, DE 19801

(Name and Address of Agent for Service)

With Copies to:

MARGERY K. NEALE, ESQ.	BENJAMIN J. HASKIN, ESQ.	ANDREW JOSEF, ESQ.
WILLKIE FARR & GALLAGHER LLP	WILLKIE FARR & GALLAGHER LLP	BLACKROCK INSTITUTIONAL TRUST COMPANY, N.A.
787 SEVENTH AVENUE	1875 K STREET, NW	400 HOWARD STREET
NEW YORK, NY 10019-6099	WASHINGTON, DC 20006-1238	SAN FRANCISCO, CA 94105

Continuous

(January 18, 2012)

It is proposed that this filing will become effective:

x immediately upon filing pursuant to paragraph (b)

¨ on              pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ on              pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on              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 filing relates solely to the following Fund, a series of iShares Trust:

iShares MSCI Taiwan Small Cap Index Fund

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all the requirements for the effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this Post-Effective Amendment No. 690 to the Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of San Francisco and the State of California on the 18^th day of January, 2012.

iShares Trust

By:
	Michael Latham*
	President and Trustee
Date:	January 18, 2012

Pursuant to the requirements of the Securities Act of 1933, as amended, this Post-Effective Amendment No. 690 to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

Michael Latham*

President and Trustee

Date: January 18, 2012

John E. Martinez*

Trustee

Date: January 18, 2012

George G. C. Parker*

Trustee

Date: January 18, 2012

Cecilia H. Herbert*

Trustee

Date: January 18, 2012

Charles A. Hurty*

Trustee

Date: January 18, 2012

John E. Kerrigan*

Trustee

Date: January 18, 2012

Robert H. Silver*

Trustee

Date: January 18, 2012

Robert S. Kapito*

Trustee

Date: January 18, 2012

Madhav V. Rajan*

Trustee

Date: January 18, 2012

/s/ Jack Gee

Jack Gee

Treasurer

Date: January 18, 2012

/s/ Jack Gee

* By: Jack Gee

Attorney-in-fact

Date: January 18, 2012

* Powers of Attorney, each dated June 23, 2011, for Michael A. Latham, Charles A. Hurty, Cecilia H. Herbert, John E. Kerrigan, Robert H. Silver, George G.C. Parker, John E. Martinez, Madhav V. Rajan and Robert S. Kapito are incorporated herein by reference to Post-Effective Amendment No. 561.

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

iShares MSCI Taiwan Small Cap Index Fund

iSHARES^® MSCI TAIWAN SMALL CAP INDEX FUND

Ticker: EWTS Stock Exchange: NYSE Arca

Investment Objective

The iShares MSCI Taiwan Small Cap Index Fund (the "Fund") seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the MSCI Taiwan Small Cap Index (the "Underlying Index").

Fees and Expenses

The following table describes the fees and expenses that you will incur if you own shares of the Fund. The investment advisory agreement between iShares Trust (the "Trust") and BlackRock Fund Advisors ("BFA") (the "Investment Advisory Agreement") provides that BFA will pay all operating expenses of the Fund, except interest expenses, taxes, brokerage expenses, future distribution fees or expenses, and extraordinary expenses.

You may also incur usual and customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the example that follows:

Annual Fund Operating Expenses
(ongoing expenses that you pay each year as a
percentage of the value of your investments)

Annual Fund Operating Expenses -	Management Fees	Distribution and Service (12b-1) Fees	Other Expenses	Total Annual Fund Operating Expenses
iShares MSCI Taiwan Small Cap Index Fund	0.74%	none	none	0.74%

Example.

This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example - (USD $)	1 Year	3 Years
iShares MSCI Taiwan Small Cap Index Fund	76	237

Portfolio Turnover.

The Fund may pay 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.

Principal Investment Strategies

The Underlying Index is designed to measure the performance of equity securities of small capitalization companies whose market capitalization, as calculated by the index provider, represents the bottom 14% of the companies in the Taiwanese securities market. Component companies include industrial, information technology and materials companies. The component companies may change over time.

BFA uses a "passive" or indexing approach to try to achieve the Fund's investment objective. Unlike many investment companies, the Fund does not try to "beat" the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued.

Indexing may eliminate the chance that the Fund will substantially outperform the Underlying Index but also may reduce some of the risks of active management, such as poor security selection. Indexing seeks to achieve lower costs and better after-tax performance by keeping portfolio turnover low in comparison to actively managed investment companies.

BFA uses a representative sampling indexing strategy to manage the Fund. "Representative sampling" is an indexing strategy that involves investing in a representative sample of securities that collectively has an investment profile similar to the Underlying Index. The securities selected are expected to have, in the aggregate, investment characteristics (based on factors such as market capitalization and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of the Underlying Index. The Fund may or may not hold all of the securities in the Underlying Index.

The Fund generally invests at least 80% of its assets in the securities of the Underlying Index or in depositary receipts representing securities of the Underlying Index. The Fund may invest the remainder of its assets in securities not included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index and in other investments including future contracts, options on futures contracts, options and swaps related to the Underlying Index, cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received).

The Underlying Index is sponsored by an organization (the "Index Provider") that is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index. The Fund's Index Provider is MSCI Inc. ("MSCI").

Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries, which may include large, mid or small capitalization companies, to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.

Summary of Principal Risks

As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. The Fund is subject to the principal risks noted below, any of which may adversely affect the Fund's net asset value per share ("NAV"), trading price, yield, total return and ability to meet its investment objective.

Asset Class Risk. Securities in the Underlying Index or in the Fund's portfolio may underperform in comparison to the general securities markets or other asset classes.

Concentration Risk. To the extent that the Fund's investments are concentrated in a particular issuer, region, country, market, industry or asset class, the Fund may be susceptible to loss due to adverse occurrences affecting that issuer, region, country, market, industry or asset class.

Currency Risk. Because the Fund's NAV is determined in U.S. dollars, the Fund's NAV could decline if the currency of a non-U.S. market in which the Fund invests depreciates against the U.S. dollar.

Custody Risk. Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by local banks, agents and depositories.

Emerging Markets Risk. The Fund's investments in emerging markets may be subject to a greater risk of loss than investments in more developed markets. Emerging markets may be more likely to experience inflation risk, political turmoil and rapid changes in economic conditions than more developed markets. Emerging markets often have less uniformity in accounting and reporting requirements, unreliable securities valuation and greater risk associated with custody of securities.

Equity Securities Risk. Equity securities are subject to changes in value and their values may be more volatile than other asset classes.

Geographic Risk. A natural or other disaster could occur in a geographic region in which the Fund invests, which could affect the economy or particular business operations of companies in the specific geographic region, causing an adverse impact on the Fund's investments in the affected region.

Industrial Sector Risk. The industrial sector may be affected by changes in the supply and demand for products and services, product obsolescence, claims for environmental damage or product liability and general economic conditions, among other factors.

Information Technology Sector Risk. Information technology companies face intense competition and potentially rapid product obsolescence. They are also heavily dependent on intellectual property rights and may be adversely affected by loss or impairment of those rights.

Issuer Risk. Fund performance depends on the performance of individual securities to which the Fund has exposure. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline.

Lack of Natural Resources Risk. The Fund invests in Taiwan, which has few natural resources. Any fluctuation or shortage in the commodity markets could have a negative impact on the Taiwanese economy.

Management Risk. As the Fund may not fully replicate the Underlying Index, it is subject to the risk that BFA's investment management strategy may not produce the intended results.

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during market downturns.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation/redemption process of the Fund. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Materials Sector Risk. Companies in the materials sector may be adversely impacted by the volatility of commodity prices, exchange rates, depletion of resources, over-production, litigation and government regulations, among other factors.

Non-Diversification Risk. The Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. As a result, the Fund's performance may depend on the performance of a small number of issuers.

Non-U.S. Securities Risk. Investments in the securities of non-U.S. issuers are subject to the risks associated with investing in those non-U.S. markets, such as heightened risks of inflation or nationalization. The Fund may lose money due to political, economic and geographic events affecting a Taiwanese issuer or market. The Fund is specifically exposed to Asian Economic Risk.

Passive Investment Risk. The Fund is not actively managed and BFA does not attempt to take defensive positions under any market conditions, including declining markets.

Reliance on Trading Partners Risk. The Fund invests in a country whose economy is heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund's investments. Through its trading partners, the Fund is specifically exposed to Asian Economic Risk and U.S. Economic Risk.

Risk of Investing in Taiwan. Investment in Taiwanese issuers involves risks that are specific to Taiwan, including legal, regulatory, political and economic risks. Such risks may adversely affect the value of the Fund's investments.

Securities Lending Risk. The Fund may engage in securities lending. Securities lending involves the risk that the Fund may lose money because the borrower of the Fund's loaned securities fails to return the securities in a timely manner or at all. The Fund could also lose money in the event of a decline in the value of the collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund.

Security Risk. The geographic area in which the Fund invests has experienced security concerns. Incidents involving a country's or region's security may cause uncertainty in Taiwanese markets and may adversely affect its economy and the Fund's investments.

Small-Capitalization Companies Risk. The Fund may invest in the securities of small-capitalization companies. Compared to mid- and large-capitalization companies, small-capitalization companies may be less stable and more susceptible to adverse developments and their securities may be more volatile and less liquid.

Structural Risk. The country in which the Fund invests may be subject to considerable degrees of economic, political and social instability.

Tracking Error Risk. The performance of the Fund may diverge from that of the Underlying Index. Because the Fund employs a representative sampling strategy, the Fund may experience tracking error to a greater extent than a fund that seeks to replicate an index. BFA EXPECTS THAT THE FUND MAY EXPERIENCE HIGHER TRACKING ERROR THAN IS TYPICAL FOR SIMILAR INDEX EXCHANGE-TRADED FUNDS.

Valuation Risk. The value of the securities in the Fund's portfolio may change on days when shareholders will not be able to purchase or sell the Fund's shares.

Performance Information

As of the date of the Fund's prospectus (the "Prospectus"), the Fund has been in operation for less than one full calendar year and therefore does not report its performance information.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Dec. 30, 2011

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Dec. 30, 2011
Registrant Name	dei_EntityRegistrantName	iSHARES TRUST
Central Index Key	dei_EntityCentralIndexKey	0001100663
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Dec. 30, 2011
Document Effective Date	dei_DocumentEffectiveDate	Dec. 30, 2011
Prospectus Date	rr_ProspectusDate	Dec. 30, 2011

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

iSHARES TRUST

Prospectus Date

rr_ProspectusDate

Dec. 30, 2011

iShares MSCI Taiwan Small Cap Index Fund | iShares MSCI Taiwan Small Cap Index Fund

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.74%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.74%

1 Year

rr_ExpenseExampleYear01

76

3 Years

rr_ExpenseExampleYear03

237

iShares MSCI Taiwan Small Cap Index Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

iSHARES^® MSCI TAIWAN SMALL CAP INDEX FUND

Ticker: EWTS Stock Exchange: NYSE Arca

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The iShares MSCI Taiwan Small Cap Index Fund (the "Fund") seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the MSCI Taiwan Small Cap Index (the "Underlying Index").

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that you will incur if you own shares of the Fund. The investment advisory agreement between iShares Trust (the "Trust") and BlackRock Fund Advisors ("BFA") (the "Investment Advisory Agreement") provides that BFA will pay all operating expenses of the Fund, except interest expenses, taxes, brokerage expenses, future distribution fees or expenses, and extraordinary expenses.

You may also incur usual and customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the example that follows:

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses
(ongoing expenses that you pay each year as a
percentage of the value of your investments)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover.

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund may pay 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.

Expense Exchange Traded Fund Commissions [Text]

rr_ExpenseExchangeTradedFundCommissions

You may also incur usual and customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the example that follows:

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 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 Underlying Index is designed to measure the performance of equity securities of small capitalization companies whose market capitalization, as calculated by the index provider, represents the bottom 14% of the companies in the Taiwanese securities market. Component companies include industrial, information technology and materials companies. The component companies may change over time.

BFA uses a "passive" or indexing approach to try to achieve the Fund's investment objective. Unlike many investment companies, the Fund does not try to "beat" the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued.

Indexing may eliminate the chance that the Fund will substantially outperform the Underlying Index but also may reduce some of the risks of active management, such as poor security selection. Indexing seeks to achieve lower costs and better after-tax performance by keeping portfolio turnover low in comparison to actively managed investment companies.

BFA uses a representative sampling indexing strategy to manage the Fund. "Representative sampling" is an indexing strategy that involves investing in a representative sample of securities that collectively has an investment profile similar to the Underlying Index. The securities selected are expected to have, in the aggregate, investment characteristics (based on factors such as market capitalization and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of the Underlying Index. The Fund may or may not hold all of the securities in the Underlying Index.

The Fund generally invests at least 80% of its assets in the securities of the Underlying Index or in depositary receipts representing securities of the Underlying Index. The Fund may invest the remainder of its assets in securities not included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index and in other investments including future contracts, options on futures contracts, options and swaps related to the Underlying Index, cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received).

The Underlying Index is sponsored by an organization (the "Index Provider") that is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index. The Fund's Index Provider is MSCI Inc. ("MSCI").

Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries, which may include large, mid or small capitalization companies, to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries, which may include large, mid or small capitalization companies, to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.

Risk [Heading]

rr_RiskHeading

Summary of Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. The Fund is subject to the principal risks noted below, any of which may adversely affect the Fund's net asset value per share ("NAV"), trading price, yield, total return and ability to meet its investment objective.

Asset Class Risk. Securities in the Underlying Index or in the Fund's portfolio may underperform in comparison to the general securities markets or other asset classes.

Concentration Risk. To the extent that the Fund's investments are concentrated in a particular issuer, region, country, market, industry or asset class, the Fund may be susceptible to loss due to adverse occurrences affecting that issuer, region, country, market, industry or asset class.

Currency Risk. Because the Fund's NAV is determined in U.S. dollars, the Fund's NAV could decline if the currency of a non-U.S. market in which the Fund invests depreciates against the U.S. dollar.

Custody Risk. Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by local banks, agents and depositories.

Emerging Markets Risk. The Fund's investments in emerging markets may be subject to a greater risk of loss than investments in more developed markets. Emerging markets may be more likely to experience inflation risk, political turmoil and rapid changes in economic conditions than more developed markets. Emerging markets often have less uniformity in accounting and reporting requirements, unreliable securities valuation and greater risk associated with custody of securities.

Equity Securities Risk. Equity securities are subject to changes in value and their values may be more volatile than other asset classes.

Geographic Risk. A natural or other disaster could occur in a geographic region in which the Fund invests, which could affect the economy or particular business operations of companies in the specific geographic region, causing an adverse impact on the Fund's investments in the affected region.

Industrial Sector Risk. The industrial sector may be affected by changes in the supply and demand for products and services, product obsolescence, claims for environmental damage or product liability and general economic conditions, among other factors.

Information Technology Sector Risk. Information technology companies face intense competition and potentially rapid product obsolescence. They are also heavily dependent on intellectual property rights and may be adversely affected by loss or impairment of those rights.

Issuer Risk. Fund performance depends on the performance of individual securities to which the Fund has exposure. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline.

Lack of Natural Resources Risk. The Fund invests in Taiwan, which has few natural resources. Any fluctuation or shortage in the commodity markets could have a negative impact on the Taiwanese economy.

Management Risk. As the Fund may not fully replicate the Underlying Index, it is subject to the risk that BFA's investment management strategy may not produce the intended results.

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during market downturns.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation/redemption process of the Fund. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Materials Sector Risk. Companies in the materials sector may be adversely impacted by the volatility of commodity prices, exchange rates, depletion of resources, over-production, litigation and government regulations, among other factors.

Non-Diversification Risk. The Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. As a result, the Fund's performance may depend on the performance of a small number of issuers.

Non-U.S. Securities Risk. Investments in the securities of non-U.S. issuers are subject to the risks associated with investing in those non-U.S. markets, such as heightened risks of inflation or nationalization. The Fund may lose money due to political, economic and geographic events affecting a Taiwanese issuer or market. The Fund is specifically exposed to Asian Economic Risk.

Passive Investment Risk. The Fund is not actively managed and BFA does not attempt to take defensive positions under any market conditions, including declining markets.

Reliance on Trading Partners Risk. The Fund invests in a country whose economy is heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund's investments. Through its trading partners, the Fund is specifically exposed to Asian Economic Risk and U.S. Economic Risk.

Risk of Investing in Taiwan. Investment in Taiwanese issuers involves risks that are specific to Taiwan, including legal, regulatory, political and economic risks. Such risks may adversely affect the value of the Fund's investments.

Securities Lending Risk. The Fund may engage in securities lending. Securities lending involves the risk that the Fund may lose money because the borrower of the Fund's loaned securities fails to return the securities in a timely manner or at all. The Fund could also lose money in the event of a decline in the value of the collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund.

Security Risk. The geographic area in which the Fund invests has experienced security concerns. Incidents involving a country's or region's security may cause uncertainty in Taiwanese markets and may adversely affect its economy and the Fund's investments.

Small-Capitalization Companies Risk. The Fund may invest in the securities of small-capitalization companies. Compared to mid- and large-capitalization companies, small-capitalization companies may be less stable and more susceptible to adverse developments and their securities may be more volatile and less liquid.

Structural Risk. The country in which the Fund invests may be subject to considerable degrees of economic, political and social instability.

Tracking Error Risk. The performance of the Fund may diverge from that of the Underlying Index. Because the Fund employs a representative sampling strategy, the Fund may experience tracking error to a greater extent than a fund that seeks to replicate an index. BFA EXPECTS THAT THE FUND MAY EXPERIENCE HIGHER TRACKING ERROR THAN IS TYPICAL FOR SIMILAR INDEX EXCHANGE-TRADED FUNDS.

Valuation Risk. The value of the securities in the Fund's portfolio may change on days when shareholders will not be able to purchase or sell the Fund's shares.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Non-Diversification Risk. The Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. As a result, the Fund's performance may depend on the performance of a small number of issuers.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance Information

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

As of the date of the Fund's prospectus (the "Prospectus"), the Fund has been in operation for less than one full calendar year and therefore does not report its performance information.

Performance One Year or Less [Text]

rr_PerformanceOneYearOrLess

As of the date of the Fund's prospectus (the "Prospectus"), the Fund has been in operation for less than one full calendar year and therefore does not report its performance information