|SPDR Nuveen S&P High Yield Muni Bd ETF|
|The investment seeks to provide investment results that correspond generally to the price and yield performance of an index that tracks the S&P Municipal Yield Index.
The fund employs a sampling strategy, which means that the fund is not required to purchase all of the securities represented in the index. The index is designed to measure the performance of high yield municipal bonds issued by U.S. states and territories or local governments or agencies, such that interest on the securities is exempt from regular federal income tax, but may be subject to the alternative minimum tax and to state and local income taxes. It is non-diversified.|
| ||HYMB||Category Avg|
|Annual Report Expense Ratio (net)||0.45%||N/A|
|Annual Holdings Turnover||21.00%||N/A|
|Total Net Assets||NaN||N/A|