-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, GR88KWlh046+D3uqv856Xl4PkvuJ5fq7J1fWrTz9vfiIjW7y3wvPSAPjfzoC+4An 0DjHuVxs/bC87+dbN081Yg== 0001193125-11-043907.txt : 20110224 0001193125-11-043907.hdr.sgml : 20110224 20110223201111 ACCESSION NUMBER: 0001193125-11-043907 CONFORMED SUBMISSION TYPE: 497 PUBLIC DOCUMENT COUNT: 8 FILED AS OF DATE: 20110224 DATE AS OF CHANGE: 20110223 EFFECTIVENESS DATE: 20110224 FILER: COMPANY DATA: COMPANY CONFORMED NAME: BLACKROCK FUNDS CENTRAL INDEX KEY: 0000844779 IRS NUMBER: 510318674 STATE OF INCORPORATION: MA FISCAL YEAR END: 0930 FILING VALUES: FORM TYPE: 497 SEC ACT: 1933 Act SEC FILE NUMBER: 033-26305 FILM NUMBER: 11633781 BUSINESS ADDRESS: STREET 1: 100 BELLEVUE PARKWAY CITY: WILMINGTON STATE: DE ZIP: 19809 BUSINESS PHONE: 800-441-7762 MAIL ADDRESS: STREET 1: 100 BELLEVUE PARKWAY CITY: WILMINGTON STATE: DE ZIP: 19809 FORMER COMPANY: FORMER CONFORMED NAME: COMPASS CAPITAL FUNDS\ DATE OF NAME CHANGE: 19961114 FORMER COMPANY: FORMER CONFORMED NAME: PNC FUND DATE OF NAME CHANGE: 19920703 FORMER COMPANY: FORMER CONFORMED NAME: NCP FUNDS DATE OF NAME CHANGE: 19890511 0000844779 S000028960 BlackRock World Gold Fund C000088962 Investor A C000088963 Investor C C000088964 Institutional 497 1 d497.htm LETTER XBRL LETTER XBRL
LOGO   

SIDLEY AUSTIN LLP

787 SEVENTH AVENUE

NEW YORK, NY 10019

(212) 839 5300

(212) 839 5599 FAX

   

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FOUNDED 1866

   

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SAN FRANCISCO

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SINGAPORE

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WASHINGTON, D.C.

February 23, 2011

VIA EDGAR

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

 

  Re:

BlackRock World Gold Fund, a series of BlackRock FundsSM

(File Nos. 33-26305 and 811-05742)                                                         

Ladies and Gentlemen:

On behalf of BlackRock FundsSM, attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in the Prospectus with respect to the Investor and Institutional Shares of BlackRock World Gold Fund (the “Fund”), dated January 28, 2011, as filed pursuant to Rule 497(c) under the Securities Act of 1933, as amended, on February 2, 2011 (the “497 Filing”). The purpose of this filing is to submit the 497 Filing in XBRL for the Fund.

Any questions or comments on the 497 Filing should be directed to the undersigned at (212) 839-5583.

 

Very truly yours,

/s/ Ellen W. Harris

Ellen W. Harris

Enclosures

 

cc:   Ben Archibald, Esq.
  BlackRock Advisors, LLC

Sidley Austin LLP is a limited liability partnership practicing in affiliation with other Sidley Austin partnerships

EX-101.INS 2 cik0000844779-20110202.xml XBRL INSTANCE DOCUMENT 0000844779 cik000844779:S000028960Member 2011-01-28 2011-01-28 0000844779 cik000844779:S000028960Member cik000844779:C000088964Member 2011-01-28 2011-01-28 0000844779 cik000844779:S000028960Member cik000844779:C000088963Member 2011-01-28 2011-01-28 0000844779 cik000844779:S000028960Member cik000844779:C000088962Member 2011-01-28 2011-01-28 0000844779 2011-01-28 2011-01-28 iso4217:USD xbrli:pure false 2011-02-02 2011-02-02 2010-09-30 Other 0000844779 BLACKROCK FUNDS 0.0001 0.0001 0.0001 <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockWorldGoldFund column period compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> <font class="_mt"><b><i>Performance Information</i></b></font> 0.0049 0.0052 0.0049 0.0025 0.01 0 <font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the fund complex advised by BlackRock Advisors, LLC ("BlackRock").</font> 25000 <div class="MetaData"> <p style="text-align: left;"><b>Example:</b></p></div> <div> <p style="text-align: left;">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that 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:</p> </div> <p style="text-align: left;">You would pay the following expenses if you did not redeem your shares:</p> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockWorldGoldFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> 231 712 <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockWorldGoldFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> 670 331 127 974 712 397 <font class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font> <div> <p style="text-align: left;">This table describes the fees and expenses that you may pay if you buy and hold shares of World Gold.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the fund complex advised by BlackRock Advisors, LLC ("BlackRock").</font> More information about these and other discounts is available from your financial professional and in the "Details About the Share Classes" section on page 42 of the Fund's prospectus and in the "Purchase of Shares" section on page II-57 of the Fund's statement of additional information ("SAI").</p> </div> <font class="_mt"><font size="1" class="_mt">The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund's most recent annual report which does not include the Acquired Fund Fees and Expenses</font></font> 0.015 0.0228 0.0125 <font class="_mt">February 1, 2012</font> 0.0075 0.0075 0.0075 0 0.01 0 0.0525 0 0 0.015 0.0228 0.0125 <font class="_mt"><b><i>Investment Objective</i></b></font> <div> <p style="text-align: left;">The investment objective of the BlackRock World Gold Fund ("World Gold" or the "Fund"), a series of BlackRock Funds<sup>SM </sup>(the "Trust"), is to seek to maximize total return. Total return means the combination of capital appreciation and investment income.</p> </div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">Annual Fund Operating Expenses</font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">(expenses that you pay each year as a</font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">percentage of the value of your investment)</font></strong></p></div> 0.0049 0.0052 0.0049 <div> <p style="text-align: left;"><font class="_mt">Because World Gold does not have a full year of operations, it does not have performance information an investor would find useful in evaluating the risks of investing in the Fund.</font>The Fund's benchmark is the FTSE Gold Mines Index.</p> </div> <font class="_mt">Because World Gold does not have a full year of operations, it does not have performance information an investor would find useful in evaluating the risks of investing in the Fund.</font> <p style="text-align: left;"><b>Portfolio Turnover:</b></p> 0.01 <div> <p style="text-align: left;">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. For the period May 26, 2010 (commencement of operations) to September 30, 2010, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1%</font> of the average value of its portfolio.</p> </div> 2011-01-28 -0.02 -0.02 -0.02 <font class="_mt"><font class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font> </font> <font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> <div> <div class="MetaData">Risk is inherent in all investing. The value of your investment in World Gold, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund. <div> <ul> <li> <p><b><i>Concentration Risk </i></b>&#8212; The Fund's strategy of concentrating in gold-related companies means that its performance will be closely tied to the performance of a particular market segment. The Fund's concentration in these companies may present more risks than if it were broadly diversified over numerous industries and sectors of the economy. A downturn in these companies would have a greater impact on the Fund than on a mutual fund that does not concentrate in such companies. At times, the performance of these companies will lag the performance of other industries or the broader market as a whole.</p> </li> <li> <p><b><i>Emerging Markets Risk </i></b>&#8212; Emerging markets are riskier than more developed markets because they tend to develop unevenly and may never fully develop. Investments in emerging markets may be considered speculative.<br />Emerging markets are more likely to experience hyperinflation and currency devaluations, which adversely affect returns to U.S. investors. In addition, many emerging securities markets have far lower trading volumes and less liquidity than developed markets.</p> </li> <li> <p><b><i>Equity Securities Risk </i></b>&#8212; Stock markets are volatile. The price of equity securities fluctuates based on changes in a company's financial condition and overall market and economic conditions.</p> </li> <li> <p><b><i>Foreign Securities Risk </i></b>&#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:</p></li></ul></div></div> <blockquote> <ul> <li type="square"> <p>The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.</p> </li> <li type="square"> <p>Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.</p> </li> <li type="square"> <p>The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.</p> </li> <li type="square"> <p>The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.</p> </li> <li type="square"> <p>Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.</p> </li> <li type="square"> <p>Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.</p></li></ul></blockquote> <ul> <li> <p><b><i>Gold and Other Precious Metal Related Securities Risk </i></b>&#8212; The price of gold and other precious metals and of gold and other precious metal related securities historically have been very volatile. The high volatility of gold and other precious metal prices may adversely affect the financial condition of companies involved with gold and other precious metals. The production and sale of precious metals by governments or central banks or other larger holders can be affected by various economic, financial, social and political factors, which may be unpredictable and may have a significant impact on the supply and prices of precious metals. The largest producers of gold are China, Australia, the Republic of South Africa, the United States and the Commonwealth of Independent States (which includes Russia and certain other countries that were part of the former Soviet Union). Economic and political conditions in those countries in particular may have a direct ef fect on the production and marketing of gold and on sales of central bank gold holdings.<br /><br />Some gold and precious metals mining operation companies may hedge their exposure to falls in gold and precious metals prices by selling forward future production, which may result in lower returns during periods when the price of gold and precious metals increases. Other factors that may affect the price of gold and other precious metals and securities related to them include changes in inflation, the outlook for inflation and changes in industrial and commercial demand for precious metals.<br /><br />In addition, in many gold-producing countries, the activities of companies engaged in gold mining are subject to the policies adopted by government officials and agencies and are subject to national and international political and economic developments. Moreover, political, social and economic conditions in many gold-producing countries are somewhat unsettled, which may pose certain risks to the Fund in addition to the risks described above in "Emerging Markets Risk" and "Foreign Securities Risk" because the Fund may hold a portion of its assets in securities of issuers in such countries. </p></li></ul> <ul> <li> <p><b><i>Investment in Other Investment Companies Risk </i></b>&#8212; As with other investments, investments in other investment companies, including ETFs, are subject to market and selection risk. In addition, if the Fund acquires shares of investment companies, shareholders bear both their proportionate share of expenses in the Fund (including management and advisory fees) and, indirectly, the expenses of the investment companies. To the extent the Fund is held by an affiliated fund, the ability of the Fund itself to hold other investment companies may be limited. </p> </li> <li> <p><b><i>Market Risk and Selection Risk </i></b>&#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money. </p> </li> <li> <p><font class="_mt"><b><i>Non-Diversification Risk </i></b>&#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font></p> </li> <li> <p><b><i>Subsidiary Risk </i></b>&#8212; By investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary's investments. The instruments related to gold and other precious metals held by the Subsidiary are generally similar to those that are permitted to be held by the Fund and are subject to the same risks that apply to similar investments if held directly by the Fund (see "Gold and Other Precious Metal Related Securities Risk" above). There can be no assurance that the investment objective of the Subsidiary will be achieved. The Subsidiary is not registered under the Investment Company Act of 1940, as amended (the "Investment Company Act"), and, unless otherwise noted in this prospectus, is not subject to all the investor protections of the Investment Company Act. However, the Fund wholly owns and controls the Subsidiary, and the Fund and the Subsidiary are both managed by BlackRock, making it unlikely that the Subsidiary will take action contrary to the interests of the Fund and its shareholders. Changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as described in this prospectus and the SAI and could adversely affect the Fund. </p></li></ul> </div> <font class="_mt"><b><i>Non-Diversification Risk </i></b>&#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font> <div class="MetaData"><font class="_mt" size="5">Fund Overview&nbsp;</font>&nbsp; <p style="text-align: left;"><b><a name="pro1pg13"> </a>Key Facts About BlackRock World Gold Fund</b></p></div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt">Shareholder Fees</font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt">(fees paid directly from your investment)</font></strong></p></div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockWorldGoldFund column period compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> <div class="MetaData"> <p style="text-align: left;"><font class="_mt"><b><i><font class="_mt"><font class="_mt"><b><i>Principal Investment Strategies of the Fu</i></b></font></font>nd</i></b> </font></p></div> <div> <div class="MetaData"> <div> <p style="text-align: left;">World Gold seeks to achieve its objective by investing primarily in equity securities of gold-related companies. A company is considered a "gold-related company" when, at the time of purchase, at least 50% of the non-current assets, capitalization, gross revenues or operating profits of the company in the most recent or current fiscal year are involved in or result from (directly or indirectly through subsidiaries) gold-mining and/or other related activities, including but not limited to, exploring for, extracting, refining or processing gold. Under normal circumstances, the Fund will invest at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of gold-related companies. For purposes of this policy, investments in exchange traded funds ("ETFs") that invest primarily in physical gold or in equity securities of gold-related companies will be treated as investments in equity securities of gold-related companies. Equity securities inc lude common stock, preferred stock, securities convertible into common stock or securities or other instruments whose price is linked to the value of common stock. The Fund may also invest in the equity securities of companies whose predominant economic activity is the mining of other precious metals, minerals or base metals and in related ETFs. The Fund generally does not hold physical gold or other precious metals.</p> <p style="text-align: left;">The Fund may seek to provide exposure to the investment returns of gold and other precious metals that trade in the commodity markets through investments designed to provide this exposure without direct investment in gold or other precious metals or futures contracts related thereto. Such exposure may be obtained through investments in derivative instruments linked to gold and other precious metals and investment vehicles, such as ETFs, that exclusively invest in gold and other precious metals. The Fund may make such investments directly or through investments in BlackRock Cayman World Gold Fund 1, Ltd. (the "Subsidiary"), a wholly-owned subsidiary of the Fund formed in the Cayman Islands, which invests primarily in instruments related to gold or other precious metals, including through certain derivatives transactions. The Fund will not invest more than 25% of its total assets (measured at the time of investment) in the Subsidiary.</p> <p style="text-align: left;">The Fund is a non-diversified fund, which means that it can invest more of its assets in fewer companies than a diversified fund. The Fund will normally invest in both U.S. and non-U.S. companies, including companies located in emerging markets, such as Russia, and in securities denominated in both U.S. dollars and foreign currencies. The Fund may invest in securities of issuers of any market capitalization.</p> <p style="text-align: left;">The Fund seeks to invest in companies that offer the best exposure to metals and minerals prices within an acceptable risk level. The Fund attempts to identify inefficiencies in the market by constructing the portfolio to reflect Fund management's views of the macro-economic environment (relating to the precious metals sector) as well as by using a "bottom up" approach, which entails the fundamental analysis of individual stocks and companies.</p></div></div> </div> The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund's most recent annual report which does not include the Acquired Fund Fees and Expenses. As described in the "Management of the Funds" section of the Fund's prospectus on pages 58-64, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) as a percentage of average daily net assets to 1.49% (for Investor A Shares), 2.27% (for Investor C Shares) and 1.24% (for Institutional Shares) until February 1, 2012. The Fund may have to repay some of these waivers and reimbursements to BlackRock in the following two years. The agreement may be terminated upon 90 days' notice by a majority of the non-interested trustees of the Trust or by a vote of a majority of the outstanding voting securities of the Fund. A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more. There is no CDSC on Investor C Shares after one year. 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It is commonly abbreviated as CIK.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 falsefalse7false0dei_AmendmentFlagdeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00falsefalsefalsefalsefalsefalseOtherxbrli:booleanItemTypenaIf the value is true, then the document as an amendment to previously-filed/accepted document.No authoritative reference available.falsefalse8false0dei_DocumentCreationDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-02-02falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date the document was made available and submitted, in CCYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.No authoritative reference available.falsefalse9false0dei_DocumentEffectiveDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-02-02falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date when a document, upon receipt and acceptance, becomes officially effective, in CCYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases.No authoritative reference available.falsefalse10false0rr_ProspectusDaterrfalsenadurationNo definition available.falsefalsefalsefalsefa lsefalsefalsefalsefalsefalse1falsefalsefalse002011-01-28falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date of the prospectus.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 1 -Paragraph 3 -Subsection a falsefalse11false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse2falsefalseUSDtruefalse{dei_LegalEntityAxis} : S000028960 Member {rr_ProspectusShareClassAxis} : C000088962 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20112http://www.sec.gov/CIK0000844779duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor A Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088962Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse12true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse13false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.05250.0525falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse14false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[1]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) ba sed on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse15false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated 1truetruetrue0.020.02falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any re demption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse16false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetru etrue0.00750.0075falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse17false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Refer ence 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse18false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00490.0049falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not incl ude extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse19false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.00490.0049falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse20false0rr_Component3OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruetrue00&nbsp;falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse21false0rr_AcquiredFundFeesAndExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.00010.0001[2]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse22false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.0150.015[2]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than on e Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse23false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruetr ue00&nbsp;[3]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a s econd caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse24false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetrue< DisplayZeroAsNone>true0.0150.015[3]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse25false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue670670falsetruefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.< ElementReferences>Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse26false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue974974falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse27false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse3falsefalseUSDtruefalse{dei_LegalEntityAxis} : S000028960 Member {rr_ProspectusShareClassAxis} : C000088963 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20113http://www.sec.gov/CIK0000844779duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088963Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse28true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse29false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table , if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse30false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01[4]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (lo ad) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse31false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated 1truetruetrue0.020.02falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any re demption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse32false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetru etrue0.00750.0075falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse33false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse34false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00520.0052falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not incl ude extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse35false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.00520.0052falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse36false0rr_Component3OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruetrue00&nbsp;falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse37false0rr_AcquiredFundFeesAndExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.00010.0001[2]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse38false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.02280.0228[2]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse39false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruetr ue00&nbsp;[3]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a s econd caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse40false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetrue< DisplayZeroAsNone>true0.02280.0228[3]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse41false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue331331falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower. Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse42false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue712712falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse43false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 231231falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse44false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue< /DisplayZeroAsNone>712712falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse45false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse4falsefalseUSDtruefalse{dei_LegalEntityAxis} : S000028960 Member {rr_ProspectusShareClassAxis} : C000088964 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20114http://www.sec.gov/CIK0000844779duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInstitutional Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088964Memberrr_ProspectusShareClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse46true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalse< IsEquityAdjustmentRow>falsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse47false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse48false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset va lue at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse49false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated 1truetruetrue0.020.02falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any re demption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse50false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetru etrue0.00750.0075falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse51false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse52false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00490.0049falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not incl ude extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse53false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.00490.0049falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse54false0rr_AcquiredFundFeesAndExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00010.0001[2]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse55false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.01250.0125[2]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse56false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.01250.0125[3]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse57false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue127127falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower. Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse58false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue397397falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse59false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{dei_LegalEntityAxis} : S000028960 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20115http://www.sec.gov/CIK0000844779duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse60true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse61false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><font class="_mt" size="5">Fund Overview&nbsp;</font>&nbsp; <p style="text-align: left;"><b><a name="pro1pg13"> </a>Key Facts About BlackRock World Gold Fund</b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse62false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt"><b><i>Investment Objective</i></b></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse63false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="text-align: left;">The investment objective of the BlackRock World Gold Fund ("World Gold" or the "Fund"), a series of BlackRock Funds<sup>SM </sup>(the "Trust"), is to seek to maximize total return. Total return means the combination of capital appreciation and investment income.</p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse64false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<font class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securitie s (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse65false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="text-align: left;">This table describes the fees and expenses that you may pay if you buy and hold shares of World Gold.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the fund complex advised by BlackRock Advisors, LLC ("BlackRock").</font> More information about these and other discounts is available from your financial professional and in the "Details About the Share Classes" section on page 42 of the Fund's prospectus and in the "Purchase of Shares" section on page II-57 of the Fund's statement of additional information ("SAI").</p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying an d selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse66false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt">Shareholder Fees</font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt">(fees paid directly from your investment)</font></strong></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse67false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">Annual Fund Operating Expenses</font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">(expenses that you pay each year as a</font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">percentage of the value of your investment)</font></strong></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse68false0rr_FeeWaiverOrReimbursementOverAssetsDateOfTerminationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt">February 1, 2012</font>falsefalsefalsefalsefalseOtherus-types:dateStringItemTypenormalizedstringThis element represents the date of expected termination of any expense reimbursement or fee waiver arrangements that reduce any Fund operating expenses (SEC Form N-1A 2006-09-14 A.3.table.1.11 Total Annual Fund Operating Expenses A.3.instructions.3.e).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph e -Subsection instructions falsefalse69false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style="text-align: left;"><b>Portfolio Turnover:</b></p>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse70false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="text-align: left;">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. For the period May 26, 2010 (commencement of operations) to September 30, 2010, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1%</font> of the average value of its portfolio.</p> </div>falsefalsefalsefalsefalseOther us-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse71false0rr_PortfolioTurnoverRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.010.01falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureThis element represents the rate of portfolio turnover presented as a percentage (SEC Form N-1A 2006-09-14 A.3.example.3 Portfolio Turnover A.3.instructions.5 Portfolio Turnover).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse72false0rr_ExpenseBreakpointDiscountsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the fund complex advised by BlackRock Advisors, LLC ("BlackRock").</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that sho wn.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse73false0rr_ExpenseBreakpointMinimumInvestmentRequiredAmountrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse2500025000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the minimum level of investment required to qualify for discounted sales charges or fund expenses (SEC Form N-1A 2006-09-14 A.3.instructions.1.b).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse74false0rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFeesrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1false falsefalse00<font class="_mt"><font size="1" class="_mt">The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund's most recent annual report which does not include the Acquired Fund Fees and Expenses</font></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThe Fund may clarify in a footnote to the fee table that the total annual fund operatin g expenses under Item 3 do not correlate to the ratio of expenses to average net assets given in response to Item 8, which reflects the operating expenses of the Fund and does not include Acquired Fund fees and expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph f -Clause vii -Subsection instructions falsefalse75false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="text-align: left;"><b>Example:</b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse76false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="text-align: left;">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that 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:</p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestrin gThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse77false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style="text-align: left;">You would pay the following expenses if you did not redeem your shares:</p>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse78false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div class="MetaData"> <p style="text-align: left;"><font class="_mt"><b><i><font class="_mt"><font class="_mt"><b><i>Principal Investment Strategies of the Fu</i></b></font></font>nd</i></b> </font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or wi ll invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse79false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <div> <p style="text-align: left;">World Gold seeks to achieve its objective by investing primarily in equity securities of gold-related companies. A company is considered a "gold-related company" when, at the time of purchase, at least 50% of the non-current assets, capitalization, gross revenues or operating profits of the company in the most recent or current fiscal year are involved in or result from (directly or indirectly through subsidiaries) gold-mining and/or other related activities, including but not limited to, exploring for, extracting, refining or processing gold. Under normal circumstances, the Fund will invest at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of gold-related companies. For purposes of this policy, investments in exchange traded funds ("ETFs") that invest primarily in physical gold or in equity securities of gold-related companies will be treated as investments in equity securities of gold-related companies. Equity securities inc lude common stock, preferred stock, securities convertible into common stock or securities or other instruments whose price is linked to the value of common stock. The Fund may also invest in the equity securities of companies whose predominant economic activity is the mining of other precious metals, minerals or base metals and in related ETFs. The Fund generally does not hold physical gold or other precious metals.</p> <p style="text-align: left;">The Fund may seek to provide exposure to the investment returns of gold and other precious metals that trade in the commodity markets through investments designed to provide this exposure without direct investment in gold or other precious metals or futures contracts related thereto. Such exposure may be obtained through investments in derivative instruments linked to gold and other precious metals and investment vehicles, such as ETFs, that exclusively invest in gold and other precious metals. The Fund may make such investments directly or through investments in BlackRock Cayman World Gold Fund 1, Ltd. (the "Subsidiary"), a wholly-owned subsidiary of the Fund formed in the Cayman Islands, which invests primarily in instruments related to gold or other precious metals, including through certain derivatives transactions. The Fund will not invest more than 25% of its total assets (measured at the time of investment) in the Subsidiary.</p> <p style="text-align: left;">The Fund is a non-diversified fund, which means that it can invest more of its assets in fewer companies than a diversified fund. The Fund will normally invest in both U.S. and non-U.S. companies, including companies located in emerging markets, such as Russia, and in securities denominated in both U.S. dollars and foreign currencies. The Fund may invest in securities of issuers of any market capitalization.</p> <p style="text-align: left;">The Fund seeks to invest in companies that offer the best exposure to metals and minerals prices within an acceptable risk level. The Fund attempts to identify inefficiencies in the market by constructing the portfolio to reflect Fund management's views of the macro-economic environment (relating to the precious metals sector) as well as by using a "bottom up" approach, which entails the fundamental analysis of individual stocks and companies.</p></div></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse80false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt"><font class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font> </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse81false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData">Risk is inherent in all investing. The value of your investment in World Gold, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund. <div> <ul> <li> <p><b><i>Concentration Risk </i></b>&#8212; The Fund's strategy of concentrating in gold-related companies means that its performance will be closely tied to the performance of a particular market segment. The Fund's concentration in these companies may present more risks than if it were broadly diversified over numerous industries and sectors of the economy. A downturn in these companies would have a greater impact on the Fund than on a mutual fund that does not concentrate in such companies. At times, the performance of these companies will lag the performance of other industries or the broader market as a whole.</p> </li> <li> <p><b><i>Emerging Markets Risk </i></b>&#8212; Emerging markets are riskier than more developed markets because they tend to develop unevenly and may never fully develop. Investments in emerging markets may be considered speculative.<br />Emerging markets are more likely to experience hyperinflation and currency devaluations, which adversely affect returns to U.S. investors. In addition, many emerging securities markets have far lower trading volumes and less liquidity than developed markets.</p> </li> <li> <p><b><i>Equity Securities Risk </i></b>&#8212; Stock markets are volatile. The price of equity securities fluctuates based on changes in a company's financial condition and overall market and economic conditions.</p> </li> <li> <p><b><i>Foreign Securities Risk </i></b>&#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:</p></li></ul></div></div> <blockquote> <ul> <li type="square"> <p>The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.</p> </li> <li type="square"> <p>Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.</p> </li> <li type="square"> <p>The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.</p> </li> <li type="square"> <p>The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.</p> </li> <li type="square"> <p>Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.</p> </li> <li type="square"> <p>Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.</p></li></ul></blockquote> <ul> <li> <p><b><i>Gold and Other Precious Metal Related Securities Risk </i></b>&#8212; The price of gold and other precious metals and of gold and other precious metal related securities historically have been very volatile. The high volatility of gold and other precious metal prices may adversely affect the financial condition of companies involved with gold and other precious metals. The production and sale of precious metals by governments or central banks or other larger holders can be affected by various economic, financial, social and political factors, which may be unpredictable and may have a significant impact on the supply and prices of precious metals. The largest producers of gold are China, Australia, the Republic of South Africa, the United States and the Commonwealth of Independent States (which includes Russia and certain other countries that were part of the former Soviet Union). Economic and political conditions in those countries in particular may have a direct ef fect on the production and marketing of gold and on sales of central bank gold holdings.<br /><br />Some gold and precious metals mining operation companies may hedge their exposure to falls in gold and precious metals prices by selling forward future production, which may result in lower returns during periods when the price of gold and precious metals increases. Other factors that may affect the price of gold and other precious metals and securities related to them include changes in inflation, the outlook for inflation and changes in industrial and commercial demand for precious metals.<br /><br />In addition, in many gold-producing countries, the activities of companies engaged in gold mining are subject to the policies adopted by government officials and agencies and are subject to national and international political and economic developments. Moreover, political, social and economic conditions in many gold-producing countries are somewhat unsettled, which may pose certain risks to the Fund in addition to the risks described above in "Emerging Markets Risk" and "Foreign Securities Risk" because the Fund may hold a portion of its assets in securities of issuers in such countries. </p></li></ul> <ul> <li> <p><b><i>Investment in Other Investment Companies Risk </i></b>&#8212; As with other investments, investments in other investment companies, including ETFs, are subject to market and selection risk. In addition, if the Fund acquires shares of investment companies, shareholders bear both their proportionate share of expenses in the Fund (including management and advisory fees) and, indirectly, the expenses of the investment companies. To the extent the Fund is held by an affiliated fund, the ability of the Fund itself to hold other investment companies may be limited. </p> </li> <li> <p><b><i>Market Risk and Selection Risk </i></b>&#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money. </p> </li> <li> <p><font class="_mt"><b><i>Non-Diversification Risk </i></b>&#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font></p> </li> <li> <p><b><i>Subsidiary Risk </i></b>&#8212; By investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary's investments. The instruments related to gold and other precious metals held by the Subsidiary are generally similar to those that are permitted to be held by the Fund and are subject to the same risks that apply to similar investments if held directly by the Fund (see "Gold and Other Precious Metal Related Securities Risk" above). There can be no assurance that the investment objective of the Subsidiary will be achieved. The Subsidiary is not registered under the Investment Company Act of 1940, as amended (the "Investment Company Act"), and, unless otherwise noted in this prospectus, is not subject to all the investor protections of the Investment Company Act. However, the Fund wholly owns and controls the Subsidiary, and the Fund and the Subsidiary are both managed by BlackRock, making it unlikely that the Subsidiary will take action contrary to the interests of the Fund and its shareholders. Changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as described in this prospectus and the SAI and could adversely affect the Fund. </p></li></ul> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with a n investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse82false0rr_RiskLoseMoneyrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSummarize the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject and the circumstances reasonably likely to affect adversely the Fund's net asset value, yield, and total return. Unless the Fund is a Money Market Fund , disclose that loss of money is a risk of investing in the Fund. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Subsection b falsefalse83false0rr_RiskNondiversifiedStatusrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<font class="_mt"><b><i>Non-Diversification Risk </i></b>&#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, state that the Fund is non-diversified, describe the effect of n on-diversification (e.g., disclose that, compared with other funds, the Fund may invest a greater percentage of its assets in a particular issuer), and summarize the risks of investing in a non-diversified fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph iv -Subsection b falsefalse84false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefals e00<font class="_mt"><b><i>Performance Information</i></b></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse85false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <p style="text-align: left;"><font class="_mt">Because World Gold does not have a full year of operations, it does not have performance information an investor would find useful in evaluating the risks of investing in the Fund.</font>The Fund's benchmark is the FTSE Gold Mines Index.</p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse86false0rr_PerformanceOneYearOrLessrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt">Because World Gold does not have a full year of operations, it does not have performance information an investor would find useful in evaluating the risks of investing in the Fund.</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFor a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropria te, the narrative explanation required by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance). Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b Reference 2: 2 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 1 -Exhibit b -Subsection b falsefalse1A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more. 2 The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund's most recent annual report which does not include the Acquired Fund Fees and Expenses.3As described in the "Management of the Funds" section of the Fund's prospectus on pages 58-64, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) as a percentage of average daily net assets to 1.49% (for Investor A Shares), 2.27% (for Investor C Shares) and 1.24% (for Institutional Shares) until February 1, 2012. The Fund may have to repay some of these waivers and reimbursements to BlackRock in the following two years. The agreement may be terminated upon 90 days' notice by a majority of the non-interested truste es of the Trust or by a vote of a majority of the outstanding voting securities of the Fund. 4There is no CDSC on Investor C Shares after one year. 185Risk/Return Detail Data (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue XML 11 defnref.xml IDEA: XBRL DOCUMENT No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. 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XML 12 R1.xml IDEA: Risk/Return Summary (BlackRock World Gold Fund) 2.2.0.25truefalse015001 - Document - Risk/Return Summary {Unlabeled} (BlackRock World Gold Fund)falsefalsetrue1falsefalseUSDtruefalse{dei_LegalEntityAxis} : S000028960 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20115http://www.sec.gov/CIK0000844779duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000844779_S000028960Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><font class="_mt" size="5">Fund Overview&nbsp;</font>&nbsp; <p style="text-align: left;"><b><a name="pro1pg13"> </a>Key Facts About BlackRock World Gold Fund</b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse4false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt"><b><i>Investment Objective</i></b></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse5false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="text-align: left;">The investment objective of the BlackRock World Gold Fund ("World Gold" or the "Fund"), a series of BlackRock Funds<sup>SM </sup>(the "Trust"), is to seek to maximize total return. Total return means the combination of capital appreciation and investment income.</p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse6false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. 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 may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse7false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="text-align: left;">This table describes the fees and expenses that you may pay if you buy and hold shares of World Gold.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the fund complex advised by BlackRock Advisors, LLC ("BlackRock").</font> More information about these and other discounts is available from your financial professional and in the "Details About the Share Classes" section on page 42 of the Fund's prospectus and in the "Purchase of Shares" section on page II-57 of the Fund's statement of additional information ("SAI").</p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying an d selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse8false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt">Shareholder Fees</font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt">(fees paid directly from your investment)</font></strong></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse9false0rr_ShareholderFeesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockWorldGoldFund column period compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockWorldGoldFund column period compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> falsehttp://www.blackrock.com/role/ScheduleShareholderFeesBlackrockWorldGoldFundfalsefalse015002 - Schedule - Shareholder Fees (BlackRock World Gold Fund)truefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000844779_S000028960MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor A Sharesrr_ProspectusShareClassAxi sxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088962Memberrr_ProspectusShareClassAxisexplicitMemberBlackRock World Gold FundInvestor A SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170false< /LabelColumn>USDfalsefalse$2falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000844779_S000028960MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088963Memberrr_ProspectusShareClassAxisexplicitMemberBlackRock World Gold FundInvestor C SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$ 3falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000844779_S000028960MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00false falseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInstitutional Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088964Memberrr_ProspectusShareClassAxisexplicitMemberBlackRock World Gold FundInstitutional SharesUnit12Standardhttp://www.xbrl.org/ 2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*6false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue00[1]falsefalsefalsetruefalse2truetruetrue0.010.01[2]falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabul ar presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse0rr_MaximumDeferredSalesChargeOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[1]falsefalsefalsetruefalse2truetruetrue0.010.01[2]falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse3falseRowprimaryElement*7false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truetruetrue0.020.02falsefalsefalsetruefalse2truetruetrue0.020.02falsefalsefalsetruefalse3truetruetrue0.020.02falsefalsefalsetruefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any redemption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse0rr_RedemptionFeeOverRedemptiontruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.020.02falsefalsefalsetruefalse2truetruetrue0.020.02falsefalsefalsetruefalse3truetruetrue0.020.02falsefalsefalsetruefalseOthernanafalsefalse1A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more. 2There is no CDSC on Inv estor C Shares after one year. 33Shareholder Fees (BlackRock World Gold Fund) BlackRock World Gold FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000844779_S000028960MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ShareholderFeesData.No authoritative reference available.falsefalse10false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">Annual Fund Operating Expenses</font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">(expenses that you pay each year as a</font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">percentage of the value of your investment)</font></strong></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse11false0rr_AnnualFundOperatingExpensesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockWorldGoldFund column period compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockWorldGoldFund column period compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div& amp;gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockWorldGoldFundfalsefalse015003 - Schedule - Annual Fund Operating Expenses (BlackRock World Gold Fund)truefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000844779_S000028960Member Columnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseI nvestor A Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088962Memberrr_ProspectusShareClassAxisexplicitMemberBlackRock World Gold FundInvestor A SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000844779_S000028960MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088963Memberrr_ProspectusShareClass AxisexplicitMemberBlackRock World Gold FundInvestor C SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$3falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000844779_S000028960MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInstitutional Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088964Memberrr_ProspectusShareClassAxisexplicitMemberBlackRock World Gold FundInstitutional SharesUnit12Standa rdhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00750.0075falsefalsefalsetruefalse2truetruetrue0.00750.0075falsefalsefalsetruefalse3truetruetrue0.00750.0075falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00750.0075falsefalsefalsetruefalse2truetruetrue0.00750.0075falsefalsefalsetruefalse3truetruetrue0.00750.0075falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025falsefalsefalsetruefalse2truetruetrue0.010.01falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025falsefalsefalsetruefalse2truetruetrue0.010.01falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse3falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00490.0049falsefals efalsetruefalse2truetruetrue0.00520.0052falsefalsefalsetruefalse3truetruetrue0.00490.0049falsefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00490.0049falsefalsefalsetruefalse2truetruetrue0.00520.0052falsefalsefalsetruefalse3truetruetrue0.00490.0049falsefalsefalsetruefalseOthernanafalsefalse4falseRowprimaryElement*8false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.00490.0049falsefalsefalsetruefalse2truetruetrue0.00520.0052falsefalsefalsetruefalse3truetruetrue0.00490.0049falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse0rr_Component1OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00490.0049falsefalsefalsetruefalse2truetruetrue0.00520.0052falsefalsefalsetruefalse3truetruetrue0.00490.0049falsefalsefalsetruefalseOthernanafalsefalse5falseRowprimaryElement*9false0rr_Component3OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruetrue00&nbsp;falsefalsefalsetruefalse2falsetruetrue00&nbsp;falsefalsefalsetruefalse3falsetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse0rr_Component3OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalse2falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalse3falsefalsefal se00falsefalsefalsefalsefalseOthernanafalsefalse6falseRowprimaryElement*10false0rr_AcquiredFundFeesAndExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00010.0001[1]falsefalsefalsetruefalse2truetruetrue0.00010.0001[1]falsefalsefalsetruefalse3truetruetrue0.00010.0001[1]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse0rr_AcquiredFundFeesAndExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.00010.0 001falsefalsefalsetruefalse2truetruetrue0.00010.0001falsefalsefalsetruefalse3truetruetrue0.00010.0001falsefalsefalsetruefalseOthernanafalsefalse7falseRowprimaryElement*11false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.0150.015[1]falsefalsefalsetruefalse2truetruetrue0.02280.0228[1]falsefalsefalsetruefalse3truetruetrue0.01250.0125[1]< IsIndependantCurrency>falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.0150.015falsefalsefalsetruefalse2truetruetrue0.02280.0228falsefalsefalsetruefalse3truetruetrue0.01250.0125falsefalsefalsetruefalseOthernanafalsefalse8falseRowprimaryElement*12false0rr_FeeWaiverOrReimbursementOverAssets rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruetrue00&nbsp;[2]falsefalsefalsetruefalse2falsetruetrue00&nbsp;[2]falsefalsefalsetruefalse3falsetruetrue00falsefalsefalsetruefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption o f the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse0rr_FeeWaiverOrReimbursementOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1falsetruetrue0 0&nbsp;&nbsp;falsefalsefalsetruefalse2falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsefalsefalseOthernanafalsefalse9falseRowprimaryElement*13false 0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue0.0150.015[2]falsefalsefalsetruefalse2truetruetrue0.02280.0228[2]falsefalsefalsetruefalse3truetruetrue0.01250.0125[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse0rr_NetExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.0150.015falsefalsefalsetruefalse2truetruetrue0.02280.0228falsefalsefalsetruefalse3truetruetrue0.012 50.0125falsefalsefalsetruefalseOthernanafalsefalse1 The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund's most recent annual report which does not include the Acquired Fund Fees and Expenses.2As described in the "Management of the Funds" section of the Fund's prospectus on pages 58-64, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) as a percentage of average daily net assets to 1.49% (for Investor A Shares), 2.27% (for Investor C Shares) and 1.24% (for Institutional Shares) until February 1, 2012. The Fund may have to repay some of these waivers and reimbursements to BlackRock in the following two years. The agreement may be terminated upon 90 days' notice by a majority of the non-interested truste es of the Trust or by a vote of a majority of the outstanding voting securities of the Fund. 39Annual Fund Operating Expenses (BlackRock World Gold Fund) BlackRock World Gold FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000844779_S000028960MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalse12false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="text-align: left;"><b>Example:</b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse13false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="text-align: left;">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that 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:</p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestrin gThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse14false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockWorldGoldFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockWorldGoldFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt ; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockWorldGoldFundfalsefalse015004 - Schedule - Expense Example {Transposed} (BlackRock World Gold Fund)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false< /IsAbstractGroupTitle>0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue670670falsefalsefalsetruefalse2truefalsetrue331331falsefalsefalsetruefalse3truefalsetrue127127falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue974974falsefalsefalsetruefalse2truefalsetrue712712falsefalsefalsetruefalse3truefalsetrue397397falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik000844779_S000028960MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor A Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088962Memberrr_ProspectusShareClassAxisexplicitMemberBlackRock World Gold FundInvestor A SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue670670falsefalsefalsetruefalse2truefalsetrue974 974falsefalsefalsetruefalseOthernanafalsefalse2falseRowdei_LegalEntityAxisAxiscik000844779_S000028960MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088963Memberrr_ProspectusShareClassAxisexplicitMemb erBlackRock World Gold FundInvestor C SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue331331falsefalsefalsetruefalse2truefalsetrue712 712falsefalsefalsetruefalseOthernanafalsefalse3falseRowdei_LegalEntityAxisAxiscik000844779_S000028960MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInstitutional Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088964Memberrr_ProspectusShareClassAxisexplicitMemberBlackRock World Gold FundInstitutional SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue127127falsefalsefalsetruefalse2truefalsetrue397397falsefalsefalsetruefalseOthernanafalsefalse23Expense Example (BlackRock World Gold Fund) BlackRock World Gold Fund (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_LegalEntityAxisAxiscik000844779_S000028960MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No authoritative reference available.falsefalse15false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style="text-align: left;">You would pay the following expenses if you did not redeem your shares:</p>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse16false0rr_ExpenseExampleNoRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockWorldGoldFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockWorldGoldFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik000844779_S000028960Member column rr_ProspectusShareC lassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockWorldGoldFundfalsefalse015005 - Schedule - Expense Example, No Redemption {Transposed} (BlackRock World Gold Fund)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement* 5false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue231231< /RoundedNumericAmount>falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue712712falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik000844779_S000028960MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseBlackRock World Gold Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_S000028960Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000844779_C000088963Memberrr_ProspectusShareClassAxisexplicitMemberBlackRock World Gold FundInvestor C SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue231231falsefalsefalsetruefalse2truefalsetrue712 712falsefalsefalsetruefalseOthernanafalsefalse21Expense Example, No Redemption (BlackRock World Gold Fund) (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_LegalEntityAxisAxiscik000844779_S000028960MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExampleNoRedemption.No authoritative reference available.falsefalse17false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style="text-align: left;"><b>Portfolio Turnover:</b></p>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse18false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="text-align: left;">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. For the period May 26, 2010 (commencement of operations) to September 30, 2010, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1%</font> of the average value of its portfolio.</p> </div>falsefalsefalsefalsefalseOther us-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse19false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p style="text-align: left;"><font class="_mt"><b><i><font class="_mt"><font class="_mt"><b><i>Principal Investment Strategies of the Fu</i></b></font></font>nd</i></b> </font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or wi ll invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse20false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <div> <p style="text-align: left;">World Gold seeks to achieve its objective by investing primarily in equity securities of gold-related companies. A company is considered a "gold-related company" when, at the time of purchase, at least 50% of the non-current assets, capitalization, gross revenues or operating profits of the company in the most recent or current fiscal year are involved in or result from (directly or indirectly through subsidiaries) gold-mining and/or other related activities, including but not limited to, exploring for, extracting, refining or processing gold. Under normal circumstances, the Fund will invest at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of gold-related companies. For purposes of this policy, investments in exchange traded funds ("ETFs") that invest primarily in physical gold or in equity securities of gold-related companies will be treated as investments in equity securities of gold-related companies. Equity securities inc lude common stock, preferred stock, securities convertible into common stock or securities or other instruments whose price is linked to the value of common stock. The Fund may also invest in the equity securities of companies whose predominant economic activity is the mining of other precious metals, minerals or base metals and in related ETFs. The Fund generally does not hold physical gold or other precious metals.</p> <p style="text-align: left;">The Fund may seek to provide exposure to the investment returns of gold and other precious metals that trade in the commodity markets through investments designed to provide this exposure without direct investment in gold or other precious metals or futures contracts related thereto. Such exposure may be obtained through investments in derivative instruments linked to gold and other precious metals and investment vehicles, such as ETFs, that exclusively invest in gold and other precious metals. The Fund may make such investments directly or through investments in BlackRock Cayman World Gold Fund 1, Ltd. (the "Subsidiary"), a wholly-owned subsidiary of the Fund formed in the Cayman Islands, which invests primarily in instruments related to gold or other precious metals, including through certain derivatives transactions. The Fund will not invest more than 25% of its total assets (measured at the time of investment) in the Subsidiary.</p> <p style="text-align: left;">The Fund is a non-diversified fund, which means that it can invest more of its assets in fewer companies than a diversified fund. The Fund will normally invest in both U.S. and non-U.S. companies, including companies located in emerging markets, such as Russia, and in securities denominated in both U.S. dollars and foreign currencies. The Fund may invest in securities of issuers of any market capitalization.</p> <p style="text-align: left;">The Fund seeks to invest in companies that offer the best exposure to metals and minerals prices within an acceptable risk level. The Fund attempts to identify inefficiencies in the market by constructing the portfolio to reflect Fund management's views of the macro-economic environment (relating to the precious metals sector) as well as by using a "bottom up" approach, which entails the fundamental analysis of individual stocks and companies.</p></div></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse21false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt"><font class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font> </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse22false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData">Risk is inherent in all investing. The value of your investment in World Gold, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund. <div> <ul> <li> <p><b><i>Concentration Risk </i></b>&#8212; The Fund's strategy of concentrating in gold-related companies means that its performance will be closely tied to the performance of a particular market segment. The Fund's concentration in these companies may present more risks than if it were broadly diversified over numerous industries and sectors of the economy. A downturn in these companies would have a greater impact on the Fund than on a mutual fund that does not concentrate in such companies. At times, the performance of these companies will lag the performance of other industries or the broader market as a whole.</p> </li> <li> <p><b><i>Emerging Markets Risk </i></b>&#8212; Emerging markets are riskier than more developed markets because they tend to develop unevenly and may never fully develop. Investments in emerging markets may be considered speculative.<br />Emerging markets are more likely to experience hyperinflation and currency devaluations, which adversely affect returns to U.S. investors. In addition, many emerging securities markets have far lower trading volumes and less liquidity than developed markets.</p> </li> <li> <p><b><i>Equity Securities Risk </i></b>&#8212; Stock markets are volatile. The price of equity securities fluctuates based on changes in a company's financial condition and overall market and economic conditions.</p> </li> <li> <p><b><i>Foreign Securities Risk </i></b>&#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:</p></li></ul></div></div> <blockquote> <ul> <li type="square"> <p>The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.</p> </li> <li type="square"> <p>Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.</p> </li> <li type="square"> <p>The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.</p> </li> <li type="square"> <p>The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.</p> </li> <li type="square"> <p>Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.</p> </li> <li type="square"> <p>Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.</p></li></ul></blockquote> <ul> <li> <p><b><i>Gold and Other Precious Metal Related Securities Risk </i></b>&#8212; The price of gold and other precious metals and of gold and other precious metal related securities historically have been very volatile. The high volatility of gold and other precious metal prices may adversely affect the financial condition of companies involved with gold and other precious metals. The production and sale of precious metals by governments or central banks or other larger holders can be affected by various economic, financial, social and political factors, which may be unpredictable and may have a significant impact on the supply and prices of precious metals. The largest producers of gold are China, Australia, the Republic of South Africa, the United States and the Commonwealth of Independent States (which includes Russia and certain other countries that were part of the former Soviet Union). Economic and political conditions in those countries in particular may have a direct ef fect on the production and marketing of gold and on sales of central bank gold holdings.<br /><br />Some gold and precious metals mining operation companies may hedge their exposure to falls in gold and precious metals prices by selling forward future production, which may result in lower returns during periods when the price of gold and precious metals increases. Other factors that may affect the price of gold and other precious metals and securities related to them include changes in inflation, the outlook for inflation and changes in industrial and commercial demand for precious metals.<br /><br />In addition, in many gold-producing countries, the activities of companies engaged in gold mining are subject to the policies adopted by government officials and agencies and are subject to national and international political and economic developments. Moreover, political, social and economic conditions in many gold-producing countries are somewhat unsettled, which may pose certain risks to the Fund in addition to the risks described above in "Emerging Markets Risk" and "Foreign Securities Risk" because the Fund may hold a portion of its assets in securities of issuers in such countries. </p></li></ul> <ul> <li> <p><b><i>Investment in Other Investment Companies Risk </i></b>&#8212; As with other investments, investments in other investment companies, including ETFs, are subject to market and selection risk. In addition, if the Fund acquires shares of investment companies, shareholders bear both their proportionate share of expenses in the Fund (including management and advisory fees) and, indirectly, the expenses of the investment companies. To the extent the Fund is held by an affiliated fund, the ability of the Fund itself to hold other investment companies may be limited. </p> </li> <li> <p><b><i>Market Risk and Selection Risk </i></b>&#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money. </p> </li> <li> <p><font class="_mt"><b><i>Non-Diversification Risk </i></b>&#8212; The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.</font></p> </li> <li> <p><b><i>Subsidiary Risk </i></b>&#8212; By investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary's investments. The instruments related to gold and other precious metals held by the Subsidiary are generally similar to those that are permitted to be held by the Fund and are subject to the same risks that apply to similar investments if held directly by the Fund (see "Gold and Other Precious Metal Related Securities Risk" above). There can be no assurance that the investment objective of the Subsidiary will be achieved. The Subsidiary is not registered under the Investment Company Act of 1940, as amended (the "Investment Company Act"), and, unless otherwise noted in this prospectus, is not subject to all the investor protections of the Investment Company Act. However, the Fund wholly owns and controls the Subsidiary, and the Fund and the Subsidiary are both managed by BlackRock, making it unlikely that the Subsidiary will take action contrary to the interests of the Fund and its shareholders. Changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as described in this prospectus and the SAI and could adversely affect the Fund. </p></li></ul> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with a n investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse23false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt"><b><i>Performance Information</i></b></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse24false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <p style="text-align: left;"><font class="_mt">Because World Gold does not have a full 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