|iShares Barclays 3-7 Year Treasury Bond|
|The investment seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the Barclays U.S. 3-7 Year Treasury Bond Index (the "underlying index").
The fund generally invests at least 90% of its assets in the bonds of the underlying index and at least 95% of its assets in U.S. government bonds. The underlying index measures the performance of public obligations of the U.S. Treasury that have a remaining maturity of greater than or equal to three years and less than seven years. As of April 30, 2012, there were 88 issues in the underlying index. The fund is non-diversified.|
| ||IEI||Category Avg|
|Annual Report Expense Ratio (net)||0.15%||N/A|
|Annual Holdings Turnover||38.00%||N/A|
|Total Net Assets||NaN||N/A|