v3.26.1
S000004439 [Member] Annual Fund Operating Expenses - iShares Micro-Cap ETF - iShares Micro-Cap ETF
Mar. 31, 2026
 [1]
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.60%
Other Expenses (as a percentage of Assets): 0.00%
Expenses (as a percentage of Assets) 0.60%
[1] Operating expenses paid by BFA under the Investment Advisory Agreement exclude acquired fund fees and expenses, if any.