First Trust Dow 30 Equal Weight ETF Average Annual Total Returns |
12 Months Ended | 28 Months Ended | 34 Months Ended | 38 Months Ended | 58 Months Ended | 59 Months Ended | 60 Months Ended | 89 Months Ended | 101 Months Ended | 120 Months Ended | 132 Months Ended | 227 Months Ended | 229 Months Ended | 234 Months Ended | 236 Months Ended | 237 Months Ended | 238 Months Ended | 268 Months Ended | ||
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| Dow Jones Industrial Average® Equal Weight Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 16.11% | 11.25% | 11.71% | |||||||||||||||||
| Dow Jones Industrial Average® (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 14.92% | 11.58% | 12.02% | |||||||||||||||||
| S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 17.88% | 21.88% | 24.47% | 21.49% | 14.19% | 14.00% | 14.42% | 14.37% | 14.77% | 14.82% | 10.87% | 11.26% | 10.73% | 11.26% | 11.13% | 10.87% | 10.96% | 10.98% | 11.07% | |
| First Trust Dow 30 Equal Weight ETF | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 15.47% | 10.66% | 11.07% | |||||||||||||||||
| Performance Inception Date | Aug. 08, 2017 | |||||||||||||||||||
| First Trust Dow 30 Equal Weight ETF | After Taxes on Distributions | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 14.82% | 9.87% | 10.24% | |||||||||||||||||
| First Trust Dow 30 Equal Weight ETF | After Taxes on Distributions and Sales | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 9.14% | 8.05% | 8.59% | |||||||||||||||||