|First Trust ISE Water ETF|
|The investment seeks investment results that correspond generally to the price and yield (before the fund's fees and expenses) of an equity index called the ISE Water Index(TM).
The fund will normally invest at least 90% of its net assets plus the amount of any borrowings for investment purposes in common stocks that comprise the index. The index is a modified market-capitalization weighted portfolio of 36 stocks of companies as of March 31, 2013 that derive a substantial portion of their revenues from the potable and waste water industries. The fund is non-diversified.|
| ||FIW||Category Avg|
|Annual Report Expense Ratio (net)||0.60%||N/A|
|Annual Holdings Turnover||45.00%||N/A|
|Total Net Assets||NaN||N/A|