First Trust SMID Growth Strength ETF Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 102 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|||||
| The SMID Growth Strength Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [1],[2] | 3.11% | ||||||
| Russell 3000® Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 17.15% | 13.15% | 14.12% | |||||
| S&P 1000® Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 7.04% | 8.57% | 9.15% | |||||
| First Trust SMID Growth Strength ETF | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 2.42% | 6.69% | 7.07% | |||||
| Performance Inception Date | Jun. 20, 2017 | |||||||
| First Trust SMID Growth Strength ETF | After Taxes on Distributions | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 2.42% | 5.95% | 6.31% | |||||
| First Trust SMID Growth Strength ETF | After Taxes on Distributions and Sales | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 1.43% | 4.89% | 5.27% | |||||
| ||||||||