First Trust High Income Strategic Focus ETF Average Annual Total Returns |
12 Months Ended | 29 Months Ended | 49 Months Ended | 60 Months Ended | 83 Months Ended | 120 Months Ended | 122 Months Ended | 134 Months Ended | 137 Months Ended | 152 Months Ended | 154 Months Ended | |||||
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| HISF Blended Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||
| Average Annual Return, Percent | [1] | 7.67% | 1.10% | 3.37% | 2.90% | |||||||||||
| Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||
| Average Annual Return, Percent | 7.30% | 5.33% | 0.02% | (0.36%) | 1.97% | 2.01% | 1.94% | 1.93% | 1.95% | 1.97% | 1.84% | 1.92% | ||||
| Russell 3000® Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||
| Average Annual Return, Percent | 17.15% | 20.47% | 13.15% | 14.29% | 13.09% | |||||||||||
| First Trust High Income Strategic Focus ETF | ||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||
| Average Annual Return, Percent | 8.21% | 3.10% | 4.02% | 3.33% | ||||||||||||
| Performance Inception Date | Aug. 13, 2014 | |||||||||||||||
| First Trust High Income Strategic Focus ETF | After Taxes on Distributions | ||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||
| Average Annual Return, Percent | 6.14% | 1.33% | 2.23% | 1.56% | ||||||||||||
| First Trust High Income Strategic Focus ETF | After Taxes on Distributions and Sales | ||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||
| Average Annual Return, Percent | 4.82% | 1.59% | 2.30% | 1.75% | ||||||||||||
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