Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	BLACKROCK FUNDS
Prospectus Date	rr_ProspectusDate	Jan. 28, 2016
Supplement [Text Block]	bf1_SupplementTextBlock	BLACKROCK FUNDS^SM BlackRock Managed Volatility Portfolio (the “Fund”) Supplement dated May 2, 2016 to the Summary Prospectus and the Prospectus of the Fund, each dated January 28, 2016 On April 21, 2016, the Board of Trustees (the “Board”) of BlackRock Funds^SM approved certain changes to the Fund. In particular, the Board approved a change in the name of the Fund to “BlackRock Tactical Opportunities Fund” and certain changes to the Fund’s investment process. In addition, Fund management has determined to remove a benchmark index against which the Fund compares its performance. These changes are expected to become effective on or about July 1, 2016. Effective on or about July 1, 2016, the following changes are made to the Fund’s Summary Prospectus and Prospectus, as applicable: Change in the Fund’s Name BlackRock Managed Volatility Portfolio is renamed BlackRock Tactical Opportunities Fund. Change in the Fund’s Benchmarks Effective on or about July 1, 2016, the Fund removed the customized weighted index comprised of 50% MSCI All Country World Index and 50% Citigroup World Government Bond Index (hedged into USD), including its constituent components, as a performance benchmark against which the Fund measures its performance.
BLACKROCK MANAGED VOLATILITY PORTFOLIO
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	bf1_SupplementTextBlock	BLACKROCK FUNDS^SM BlackRock Managed Volatility Portfolio (the “Fund”) Supplement dated May 2, 2016 to the Summary Prospectus and the Prospectus of the Fund, each dated January 28, 2016 On April 21, 2016, the Board of Trustees (the “Board”) of BlackRock Funds^SM approved certain changes to the Fund. In particular, the Board approved a change in the name of the Fund to “BlackRock Tactical Opportunities Fund” and certain changes to the Fund’s investment process. In addition, Fund management has determined to remove a benchmark index against which the Fund compares its performance. These changes are expected to become effective on or about July 1, 2016. Effective on or about July 1, 2016, the following changes are made to the Fund’s Summary Prospectus and Prospectus, as applicable: Change in the Fund’s Name BlackRock Managed Volatility Portfolio is renamed BlackRock Tactical Opportunities Fund. Change in the Fund’s Benchmarks Effective on or about July 1, 2016, the Fund removed the customized weighted index comprised of 50% MSCI All Country World Index and 50% Citigroup World Government Bond Index (hedged into USD), including its constituent components, as a performance benchmark against which the Fund measures its performance.

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

BLACKROCK FUNDS

Prospectus Date

rr_ProspectusDate

Jan. 28, 2016

Supplement [Text Block]

bf1_SupplementTextBlock

BLACKROCK FUNDS^SM

BlackRock Managed Volatility Portfolio

(the “Fund”)

Supplement dated May 2, 2016 to the Summary Prospectus and the

Prospectus of the Fund, each dated January 28, 2016

On April 21, 2016, the Board of Trustees (the “Board”) of BlackRock Funds^SM approved certain changes to the Fund. In particular, the Board approved a change in the name of the Fund to “BlackRock Tactical Opportunities Fund” and certain changes to the Fund’s investment process. In addition, Fund management has determined to remove a benchmark index against which the Fund compares its performance. These changes are expected to become effective on or about July 1, 2016.

Effective on or about July 1, 2016, the following changes are made to the Fund’s Summary Prospectus and Prospectus, as applicable:

Change in the Fund’s Name

BlackRock Managed Volatility Portfolio is renamed BlackRock Tactical Opportunities Fund.

Change in the Fund’s Benchmarks

Effective on or about July 1, 2016, the Fund removed the customized weighted index comprised of 50% MSCI All Country World Index and 50% Citigroup World Government Bond Index (hedged into USD), including its constituent components, as a performance benchmark against which the Fund measures its performance.

BLACKROCK MANAGED VOLATILITY PORTFOLIO