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Shareholder Report
 6 Months Ended
Mar. 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name BlackRock Funds
Entity Central Index Key 0000844779
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2026
C000037627 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Advantage Small Cap Growth Fund
Class Name Class R Shares
Trading Symbol BSGRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BlackRock Advantage Small Cap Growth Fund (the “Fund”) for the period of October 1, 2025 to March 31, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441‑7762.
Additional Information Phone Number (800) 441‑7762
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Class name Costs of a $10,000
investment		 Costs paid as a percentage of a
$10,000 investment
Class R Shares $50 1.00%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 50
Expense Ratio, Percent 1.00% [1]
Net Assets $ 668,280,579
Holdings Count | Holding 609
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $668,280,579
Number of Portfolio Holdings 609
Portfolio Turnover Rate 60%
Holdings [Text Block]
What did the Fund invest in?
(as of March 31, 2026)
Sector allocation
Sector(a) Percent of
Net Assets
Industrials 24.3 %
Health Care 23.0 %
Information Technology 21.0 %
Financials 10.1 %
Consumer Discretionary 7.5 %
Materials 3.9 %
Energy 3.8 %
Consumer Staples 2.0 %
Communication Services 1.9 %
Utilities 0.8 %
Real Estate 0.7 %
Short-Term Securities 5.3 %
Liabilities in Excess of Other Assets (4.3 )%
Ten largest holdings
Security(b) Percent of
Net Assets
Bloom Energy Corp., Class A 2.1 %
Fabrinet 1.3 %
Advanced Energy Industries, Inc. 1.3 %
Credo Technology Group Holding Ltd. 1.1 %
Kratos Defense & Security Solutions, Inc. 0.9 %
Dycom Industries, Inc. 0.9 %
Ensign Group, Inc. (The) 0.9 %
Nextpower, Inc., Class A 0.8 %
Sterling Infrastructure, Inc. 0.8 %
Guardant Health, Inc. 0.7 %
​(a)
For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.
​(b)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(b) Percent of
Net Assets
Bloom Energy Corp., Class A 2.1 %
Fabrinet 1.3 %
Advanced Energy Industries, Inc. 1.3 %
Credo Technology Group Holding Ltd. 1.1 %
Kratos Defense & Security Solutions, Inc. 0.9 %
Dycom Industries, Inc. 0.9 %
Ensign Group, Inc. (The) 0.9 %
Nextpower, Inc., Class A 0.8 %
Sterling Infrastructure, Inc. 0.8 %
Guardant Health, Inc. 0.7 %
(b)Excludes short-term securities.
C000198224 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Advantage Small Cap Growth Fund
Class Name Class K Shares
Trading Symbol PSGKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BlackRock Advantage Small Cap Growth Fund (the “Fund”) for the period of October 1, 2025 to March 31, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441‑7762.
Additional Information Phone Number (800) 441‑7762
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Class name Costs of a $10,000
investment		 Costs paid as a percentage of a
$10,000 investment
Class K Shares $22 0.45%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.45% [2]
Net Assets $ 668,280,579
Holdings Count | Holding 609
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $668,280,579
Number of Portfolio Holdings 609
Portfolio Turnover Rate 60%
Holdings [Text Block]
What did the Fund invest in?
(as of March 31, 2026)
Sector allocation
Sector(a) Percent of
Net Assets
Industrials 24.3 %
Health Care 23.0 %
Information Technology 21.0 %
Financials 10.1 %
Consumer Discretionary 7.5 %
Materials 3.9 %
Energy 3.8 %
Consumer Staples 2.0 %
Communication Services 1.9 %
Utilities 0.8 %
Real Estate 0.7 %
Short-Term Securities 5.3 %
Liabilities in Excess of Other Assets (4.3 )%
Ten largest holdings
Security(b) Percent of
Net Assets
Bloom Energy Corp., Class A 2.1 %
Fabrinet 1.3 %
Advanced Energy Industries, Inc. 1.3 %
Credo Technology Group Holding Ltd. 1.1 %
Kratos Defense & Security Solutions, Inc. 0.9 %
Dycom Industries, Inc. 0.9 %
Ensign Group, Inc. (The) 0.9 %
Nextpower, Inc., Class A 0.8 %
Sterling Infrastructure, Inc. 0.8 %
Guardant Health, Inc. 0.7 %
​(a)
For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.
​(b)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(b) Percent of
Net Assets
Bloom Energy Corp., Class A 2.1 %
Fabrinet 1.3 %
Advanced Energy Industries, Inc. 1.3 %
Credo Technology Group Holding Ltd. 1.1 %
Kratos Defense & Security Solutions, Inc. 0.9 %
Dycom Industries, Inc. 0.9 %
Ensign Group, Inc. (The) 0.9 %
Nextpower, Inc., Class A 0.8 %
Sterling Infrastructure, Inc. 0.8 %
Guardant Health, Inc. 0.7 %
(b)Excludes short-term securities.
C000004049 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Advantage Small Cap Growth Fund
Class Name Investor A Shares
Trading Symbol CSGEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BlackRock Advantage Small Cap Growth Fund (the “Fund”) for the period of October 1, 2025 to March 31, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441‑7762.
Additional Information Phone Number (800) 441‑7762
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Class name Costs of a $10,000
investment		 Costs paid as a percentage of a
$10,000 investment
Investor A Shares $37 0.75%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.75% [3]
Net Assets $ 668,280,579
Holdings Count | Holding 609
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $668,280,579
Number of Portfolio Holdings 609
Portfolio Turnover Rate 60%
Holdings [Text Block]
What did the Fund invest in?
(as of March 31, 2026)
Sector allocation
Sector(a) Percent of
Net Assets
Industrials 24.3 %
Health Care 23.0 %
Information Technology 21.0 %
Financials 10.1 %
Consumer Discretionary 7.5 %
Materials 3.9 %
Energy 3.8 %
Consumer Staples 2.0 %
Communication Services 1.9 %
Utilities 0.8 %
Real Estate 0.7 %
Short-Term Securities 5.3 %
Liabilities in Excess of Other Assets (4.3 )%
Ten largest holdings
Security(b) Percent of
Net Assets
Bloom Energy Corp., Class A 2.1 %
Fabrinet 1.3 %
Advanced Energy Industries, Inc. 1.3 %
Credo Technology Group Holding Ltd. 1.1 %
Kratos Defense & Security Solutions, Inc. 0.9 %
Dycom Industries, Inc. 0.9 %
Ensign Group, Inc. (The) 0.9 %
Nextpower, Inc., Class A 0.8 %
Sterling Infrastructure, Inc. 0.8 %
Guardant Health, Inc. 0.7 %
​(a)
For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.
​(b)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(b) Percent of
Net Assets
Bloom Energy Corp., Class A 2.1 %
Fabrinet 1.3 %
Advanced Energy Industries, Inc. 1.3 %
Credo Technology Group Holding Ltd. 1.1 %
Kratos Defense & Security Solutions, Inc. 0.9 %
Dycom Industries, Inc. 0.9 %
Ensign Group, Inc. (The) 0.9 %
Nextpower, Inc., Class A 0.8 %
Sterling Infrastructure, Inc. 0.8 %
Guardant Health, Inc. 0.7 %
(b)Excludes short-term securities.
C000004047 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Advantage Small Cap Growth Fund
Class Name Institutional Shares
Trading Symbol PSGIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BlackRock Advantage Small Cap Growth Fund (the “Fund”) for the period of October 1, 2025 to March 31, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441‑7762.
Additional Information Phone Number (800) 441‑7762
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Class name Costs of a $10,000
investment		 Costs paid as a percentage of a
$10,000 investment
Institutional Shares $25 0.50%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.50% [4]
Net Assets $ 668,280,579
Holdings Count | Holding 609
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $668,280,579
Number of Portfolio Holdings 609
Portfolio Turnover Rate 60%
Holdings [Text Block]
What did the Fund invest in?
(as of March 31, 2026)
Sector allocation
Sector(a) Percent of
Net Assets
Industrials 24.3 %
Health Care 23.0 %
Information Technology 21.0 %
Financials 10.1 %
Consumer Discretionary 7.5 %
Materials 3.9 %
Energy 3.8 %
Consumer Staples 2.0 %
Communication Services 1.9 %
Utilities 0.8 %
Real Estate 0.7 %
Short-Term Securities 5.3 %
Liabilities in Excess of Other Assets (4.3 )%
Ten largest holdings
Security(b) Percent of
Net Assets
Bloom Energy Corp., Class A 2.1 %
Fabrinet 1.3 %
Advanced Energy Industries, Inc. 1.3 %
Credo Technology Group Holding Ltd. 1.1 %
Kratos Defense & Security Solutions, Inc. 0.9 %
Dycom Industries, Inc. 0.9 %
Ensign Group, Inc. (The) 0.9 %
Nextpower, Inc., Class A 0.8 %
Sterling Infrastructure, Inc. 0.8 %
Guardant Health, Inc. 0.7 %
​(a)
For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.
​(b)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(b) Percent of
Net Assets
Bloom Energy Corp., Class A 2.1 %
Fabrinet 1.3 %
Advanced Energy Industries, Inc. 1.3 %
Credo Technology Group Holding Ltd. 1.1 %
Kratos Defense & Security Solutions, Inc. 0.9 %
Dycom Industries, Inc. 0.9 %
Ensign Group, Inc. (The) 0.9 %
Nextpower, Inc., Class A 0.8 %
Sterling Infrastructure, Inc. 0.8 %
Guardant Health, Inc. 0.7 %
(b)Excludes short-term securities.
[1] Annualized.
[2] Annualized.
[3] Annualized.
[4] Annualized.