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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName BLACKROCK FUNDS
Prospectus Date rr_ProspectusDate Nov. 28, 2017
Supplement [Text Block] bf1_SupplementTextBlock
BLACKROCK FUNDSSM
BlackRock Global Long/Short Equity Fund
(the “Fund”)

Supplement dated June 1, 2018
to the Summary Prospectuses, Prospectuses and Statement of Additional Information (“SAI”) of the Fund, each dated November 28, 2017, as amended or supplemented to date

Effective June 1, 2018, BlackRock (as defined below) has agreed contractually to cap net expenses of the Fund at lower levels for the Fund’s Investor A, Investor C, Institutional and Class K Shares. To achieve these expense caps, BlackRock has agreed to waive and/or reimburse fees or expenses if the Fund’s annual fund operating expenses, excluding certain expenses described in the prospectus, exceed a certain limit for the Fund’s Investor A, Investor C, Institutional and Class K Shares. Accordingly, effective June 1, 2018, the Fund’s Summary Prospectuses, Prospectuses and SAI are amended as follows:

The section of the Investor A, Investor C and Institutional Shares Summary Prospectus entitled “Fees and Expenses of the Fund” and the section of the Investor A, Investor C and Institutional Shares Prospectus entitled “Fund Overview—Fees and Expenses of the Fund” are deleted in their entirety and replaced with the following:

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares 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 $25,000 in the fund complex advised by BlackRock Advisors, LLC (“BlackRock”) or its affiliates. More information about these and other discounts is available from your financial professional or your selected securities dealer, broker, investment adviser, service provider or industry professional (including BlackRock, The PNC Financial Services Group, Inc. and their respective affiliates) (each a “Financial Intermediary”) and in the “Details About the Share Classes” and the “Intermediary-Defined Sales Charge Waiver Policies” sections on pages 22 and A-1, respectively, of the Fund’s prospectus and in the “Purchase of Shares” section on page II-72 of Part II of the Fund’s Statement of Additional Information.

Shareholder Fees
(fees paid directly from your investment)		  Investor A
Shares		 Investor C
Shares		 Institutional
Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)    5.25%   None   None
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)    None1    1.00%2   None
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of
your investment)		  Investor A
Shares		 Investor C
Shares		 Institutional
Shares
Management Fee3    1.50%   1.50%   1.50%
Distribution and/or Service (12b-1) Fees    0.25%   1.00%   None
Other Expenses4    0.34%   0.30%   0.27%
Acquired Fund Fees and Expenses5    –   –   –
Total Annual Fund Operating Expenses6    2.09%   2.80%   1.77%
Fee Waivers and/or Expense Reimbursements3, 7    (0.20)%   (0.16)%   (0.13)%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements3, 7    1.89%   2.64%   1.64%
1 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.
2 There is no CDSC on Investor C Shares after one year.
3 As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 37, BlackRock has contractually agreed to waive the management fee with respect to any portion of the Fund’s assets estimated to be attributable to investments in other equity and fixed-income mutual funds and exchange-traded funds managed by BlackRock or its affiliates that have a contractual management fee, through November 30, 2019. The contractual 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.
4 Other Expenses have been restated to reflect current fees.
5 Acquired Fund Fees and Expenses have been restated to reflect current fees.
6 The Total Annual Fund Operating Expenses do not correlate to the ratios of expenses to average net assets given in the Fund’s most recent annual report, which do not include the restatement of Other Expenses to reflect current fees.
7 As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 37, 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 1.89% (for Investor A Shares), 2.64% (for Investor C Shares) and 1.64% (for Institutional Shares) through November 30, 2019. The Fund may have to repay some of these waivers and/or reimbursements to BlackRock in the following two years. The contractual 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.

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 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:

    1 Year     3 Years     5 Years     10 Years 
Investor A Shares  $707     $1,127     $1,572     $2,804 
Investor C Shares  $367     $853     $1,465     $3,117 
Institutional Shares  $167     $545     $947     $2,073 

You would pay the following expenses if you did not redeem your shares:

    1 Year     3 Years     5 Years     10 Years 
Investor C Shares  $267     $853     $1,465     $3,117 

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 0% of the average value of its portfolio.

The section of the Class K Shares Summary Prospectus entitled “Fees and Expenses of the Fund” and the section of the Class K Shares Prospectus entitled “Fund Overview—Fees and Expenses of the Fund” are deleted in their entirety and replaced with the following:

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold Class K Shares of the Fund.

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
  Class K
Shares
Management Fee1    1.50%
Distribution and/or Service (12b-1) Fees    None
Other Expenses2    0.19%
Acquired Fund Fees and Expenses3    –
Total Annual Fund Operating Expenses4    1.69%
Fee Waivers and/or Expense Reimbursements1, 5    (0.10)%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements1, 5    1.59%
1 As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 27, BlackRock Advisors, LLC (“BlackRock”) has contractually agreed to waive the management fee with respect to any portion of the Fund’s assets estimated to be attributable to investments in other equity and fixed-income mutual funds and exchange-traded funds managed by BlackRock or its affiliates that have a contractual management fee, through November 30, 2019. The contractual 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.
2 Other Expenses have been restated to reflect current fees.
3 Acquired Fund Fees and Expenses have been restated to reflect current fees.
4 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 restatement of Other Expenses to reflect current fees.
5 As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 27, 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) to 1.59% of average daily net assets through November 30, 2019. The Fund may have to repay some of these waivers and/or reimbursements to BlackRock in the following two years. The contractual 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.

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 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:

    1 Year     3 Years     5 Years     10 Years 
Class K Shares  $162     $523     $908     $1,989 

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 0% of the average value of its portfolio.
Investor A, C and Institutional | BlackRock Global Long/Short Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] bf1_SupplementTextBlock
BLACKROCK FUNDSSM
BlackRock Global Long/Short Equity Fund
(the “Fund”)

Supplement dated June 1, 2018
to the Summary Prospectuses, Prospectuses and Statement of Additional Information (“SAI”) of the Fund, each dated November 28, 2017, as amended or supplemented to date

Effective June 1, 2018, BlackRock (as defined below) has agreed contractually to cap net expenses of the Fund at lower levels for the Fund’s Investor A, Investor C, Institutional and Class K Shares. To achieve these expense caps, BlackRock has agreed to waive and/or reimburse fees or expenses if the Fund’s annual fund operating expenses, excluding certain expenses described in the prospectus, exceed a certain limit for the Fund’s Investor A, Investor C, Institutional and Class K Shares. Accordingly, effective June 1, 2018, the Fund’s Summary Prospectuses, Prospectuses and SAI are amended as follows:

The section of the Investor A, Investor C and Institutional Shares Summary Prospectus entitled “Fees and Expenses of the Fund” and the section of the Investor A, Investor C and Institutional Shares Prospectus entitled “Fund Overview—Fees and Expenses of the Fund” are deleted in their entirety and replaced with the following:

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares 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 $25,000 in the fund complex advised by BlackRock Advisors, LLC (“BlackRock”) or its affiliates. More information about these and other discounts is available from your financial professional or your selected securities dealer, broker, investment adviser, service provider or industry professional (including BlackRock, The PNC Financial Services Group, Inc. and their respective affiliates) (each a “Financial Intermediary”) and in the “Details About the Share Classes” and the “Intermediary-Defined Sales Charge Waiver Policies” sections on pages 22 and A-1, respectively, of the Fund’s prospectus and in the “Purchase of Shares” section on page II-72 of Part II of the Fund’s Statement of Additional Information.

Shareholder Fees
(fees paid directly from your investment)		  Investor A
Shares		 Investor C
Shares		 Institutional
Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)    5.25%   None   None
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)    None1    1.00%2   None
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of
your investment)		  Investor A
Shares		 Investor C
Shares		 Institutional
Shares
Management Fee3    1.50%   1.50%   1.50%
Distribution and/or Service (12b-1) Fees    0.25%   1.00%   None
Other Expenses4    0.34%   0.30%   0.27%
Acquired Fund Fees and Expenses5    –   –   –
Total Annual Fund Operating Expenses6    2.09%   2.80%   1.77%
Fee Waivers and/or Expense Reimbursements3, 7    (0.20)%   (0.16)%   (0.13)%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements3, 7    1.89%   2.64%   1.64%
1 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.
2 There is no CDSC on Investor C Shares after one year.
3 As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 37, BlackRock has contractually agreed to waive the management fee with respect to any portion of the Fund’s assets estimated to be attributable to investments in other equity and fixed-income mutual funds and exchange-traded funds managed by BlackRock or its affiliates that have a contractual management fee, through November 30, 2019. The contractual 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.
4 Other Expenses have been restated to reflect current fees.
5 Acquired Fund Fees and Expenses have been restated to reflect current fees.
6 The Total Annual Fund Operating Expenses do not correlate to the ratios of expenses to average net assets given in the Fund’s most recent annual report, which do not include the restatement of Other Expenses to reflect current fees.
7 As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 37, 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 1.89% (for Investor A Shares), 2.64% (for Investor C Shares) and 1.64% (for Institutional Shares) through November 30, 2019. The Fund may have to repay some of these waivers and/or reimbursements to BlackRock in the following two years. The contractual 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.

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 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:

    1 Year     3 Years     5 Years     10 Years 
Investor A Shares  $707     $1,127     $1,572     $2,804 
Investor C Shares  $367     $853     $1,465     $3,117 
Institutional Shares  $167     $545     $947     $2,073 

You would pay the following expenses if you did not redeem your shares:

    1 Year     3 Years     5 Years     10 Years 
Investor C Shares  $267     $853     $1,465     $3,117 

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 0% of the average value of its portfolio.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the fund complex advised by BlackRock Advisors, LLC (“BlackRock”) or its affiliates. More information about these and other discounts is available from your financial professional or your selected securities dealer, broker, investment adviser, service provider or industry professional (including BlackRock, The PNC Financial Services Group, Inc. and their respective affiliates) (each a “Financial Intermediary”) and in the “Details About the Share Classes” and the “Intermediary-Defined Sales Charge Waiver Policies” sections on pages 22 and A-1, respectively, of the Fund’s prospectus and in the “Purchase of Shares” section on page II-72 of Part II of the Fund’s Statement of Additional Information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees
(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of
your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover:
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 0% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate none
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock 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.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the fund complex advised by BlackRock Advisors, LLC (“BlackRock”) or its affiliates.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Other Expenses have been restated to reflect current fees.

Acquired Fund Fees and Expenses have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other 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:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Investor A, C and Institutional | BlackRock Global Long/Short Equity Fund | Investor A Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fee rr_ManagementFeesOverAssets 1.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.34% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.09% [5]
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.20%) [2],[6]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.89% [2],[6]
1 Year rr_ExpenseExampleYear01 $ 707
3 Years rr_ExpenseExampleYear03 1,127
5 Years rr_ExpenseExampleYear05 1,572
10 Years rr_ExpenseExampleYear10 $ 2,804
Investor A, C and Institutional | BlackRock Global Long/Short Equity Fund | Investor C Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [7]
Management Fee rr_ManagementFeesOverAssets 1.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.30% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.80% [5]
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.16%) [2],[6]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 2.64% [2],[6]
1 Year rr_ExpenseExampleYear01 $ 367
3 Years rr_ExpenseExampleYear03 853
5 Years rr_ExpenseExampleYear05 1,465
10 Years rr_ExpenseExampleYear10 3,117
1 Year rr_ExpenseExampleNoRedemptionYear01 267
3 Years rr_ExpenseExampleNoRedemptionYear03 853
5 Years rr_ExpenseExampleNoRedemptionYear05 1,465
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,117
Investor A, C and Institutional | BlackRock Global Long/Short Equity Fund | Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fee rr_ManagementFeesOverAssets 1.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.27% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.77% [5]
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.13%) [2],[6]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.64% [2],[6]
1 Year rr_ExpenseExampleYear01 $ 167
3 Years rr_ExpenseExampleYear03 545
5 Years rr_ExpenseExampleYear05 947
10 Years rr_ExpenseExampleYear10 $ 2,073
Class K | BlackRock Global Long/Short Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] bf1_SupplementTextBlock
BLACKROCK FUNDSSM
BlackRock Global Long/Short Equity Fund
(the “Fund”)

Supplement dated June 1, 2018
to the Summary Prospectuses, Prospectuses and Statement of Additional Information (“SAI”) of the Fund, each dated November 28, 2017, as amended or supplemented to date

Effective June 1, 2018, BlackRock (as defined below) has agreed contractually to cap net expenses of the Fund at lower levels for the Fund’s Investor A, Investor C, Institutional and Class K Shares. To achieve these expense caps, BlackRock has agreed to waive and/or reimburse fees or expenses if the Fund’s annual fund operating expenses, excluding certain expenses described in the prospectus, exceed a certain limit for the Fund’s Investor A, Investor C, Institutional and Class K Shares. Accordingly, effective June 1, 2018, the Fund’s Summary Prospectuses, Prospectuses and SAI are amended as follows:

The section of the Class K Shares Summary Prospectus entitled “Fees and Expenses of the Fund” and the section of the Class K Shares Prospectus entitled “Fund Overview—Fees and Expenses of the Fund” are deleted in their entirety and replaced with the following:

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold Class K Shares of the Fund.

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
  Class K
Shares
Management Fee1    1.50%
Distribution and/or Service (12b-1) Fees    None
Other Expenses2    0.19%
Acquired Fund Fees and Expenses3    –
Total Annual Fund Operating Expenses4    1.69%
Fee Waivers and/or Expense Reimbursements1, 5    (0.10)%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements1, 5    1.59%
1 As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 27, BlackRock Advisors, LLC (“BlackRock”) has contractually agreed to waive the management fee with respect to any portion of the Fund’s assets estimated to be attributable to investments in other equity and fixed-income mutual funds and exchange-traded funds managed by BlackRock or its affiliates that have a contractual management fee, through November 30, 2019. The contractual 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.
2 Other Expenses have been restated to reflect current fees.
3 Acquired Fund Fees and Expenses have been restated to reflect current fees.
4 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 restatement of Other Expenses to reflect current fees.
5 As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 27, 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) to 1.59% of average daily net assets through November 30, 2019. The Fund may have to repay some of these waivers and/or reimbursements to BlackRock in the following two years. The contractual 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.

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 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:

    1 Year     3 Years     5 Years     10 Years 
Class K Shares  $162     $523     $908     $1,989 

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 0% of the average value of its portfolio.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold Class K Shares of the Fund.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover:
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 0% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate none
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Other Expenses have been restated to reflect current fees.

Acquired Fund Fees and Expenses have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other 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:
Class K | BlackRock Global Long/Short Equity Fund | Class K Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 1.50% [8]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.19% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.69% [9]
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [8],[10]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.59% [8],[10]
1 Year rr_ExpenseExampleYear01 $ 162
3 Years rr_ExpenseExampleYear03 523
5 Years rr_ExpenseExampleYear05 908
10 Years rr_ExpenseExampleYear10 $ 1,989
[1] 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.
[2] As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 37, BlackRock has contractually agreed to waive the management fee with respect to any portion of the Fund’s assets estimated to be attributable to investments in other equity and fixed-income mutual funds and exchange-traded funds managed by BlackRock or its affiliates that have a contractual management fee, through November 30, 2019. The contractual 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.
[3] Other Expenses have been restated to reflect current fees.
[4] Acquired Fund Fees and Expenses have been restated to reflect current fees.
[5] The Total Annual Fund Operating Expenses do not correlate to the ratios of expenses to average net assets given in the Fund’s most recent annual report, which do not include the restatement of Other Expenses to reflect current fees.
[6] As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 37, 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 1.89% (for Investor A Shares), 2.64% (for Investor C Shares) and 1.64% (for Institutional Shares) through November 30, 2019. The Fund may have to repay some of these waivers and/or reimbursements to BlackRock in the following two years. The contractual 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.
[7] There is no CDSC on Investor C Shares after one year.
[8] As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 27, BlackRock Advisors, LLC (“BlackRock”) has contractually agreed to waive the management fee with respect to any portion of the Fund’s assets estimated to be attributable to investments in other equity and fixed-income mutual funds and exchange-traded funds managed by BlackRock or its affiliates that have a contractual management fee, through November 30, 2019. The contractual 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.
[9] 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 restatement of Other Expenses to reflect current fees.
[10] As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 27, 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) to 1.59% of average daily net assets through November 30, 2019. The Fund may have to repay some of these waivers and/or reimbursements to BlackRock in the following two years. The contractual 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.