First Trust Japan AlphaDEX Fund Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| First Trust Japan AlphaDEX Fund | First Trust Japan AlphaDEX Fund | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 32.14% | 5.84% | 22.42% | (12.04%) | (0.69%) | 1.71% | 8.27% | (17.66%) | 26.70% | 2.91% |