First Trust Large Cap Growth AlphaDEX Fund Investment Objectives and Goals - First Trust Large Cap Growth AlphaDEX Fund |
Jul. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | <span style="color:#000000;font-family:Arial;font-size:12.60pt;font-weight:bold;">First Trust Large Cap Growth AlphaDEX</span><span style="color:#000000;font-family:Arial;font-size:7.38pt;font-weight:bold;position:relative;top:-4.25pt;">®</span><span style="color:#000000;font-family:Arial;font-size:12.60pt;font-weight:bold;"> Fund (FTC)</span> |
| Objective [Heading] | <span style="color:#000000;font-family:Arial;font-size:9.90pt;font-weight:bold;">Investment Objective</span> |
| Objective, Primary [Text Block] | The First Trust Large Cap Growth AlphaDEX® Fund (the “Fund”) seeks investment results that correspond generally to the price and yield (before the Fund’s fees and expenses) of an equity index called the Nasdaq AlphaDEX Large Cap GrowthTM Index (the “Index”). |