|SPDR SSgA Global Allocation ETF|
|The investment seeks to provide capital appreciation.
The fund invests substantially all of its assets in the SSgA Global Allocation Portfolio (the "Portfolio"), a separate series of the SSgA Master Trust with an identical investment objective as the fund. As a result, the fund invests indirectly through the Portfolio. The Portfolio typically allocates approximately 60% of its assets to equity securities, though this percentage can vary based on the Adviser's tactical decisions.|
| ||GAL||Category Avg|
|Annual Report Expense Ratio (net)||0.05%||N/A|
|Annual Holdings Turnover||89.00%||N/A|
|Total Net Assets||NaN||N/A|