First Trust US Equity Opportunities 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 | 198 Months Ended | 224 Months Ended | 227 Months Ended | 229 Months Ended | 234 Months Ended | 236 Months Ended | 237 Months Ended | 238 Months Ended | 243 Months Ended | 268 Months Ended | ||
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| IPOX®-100 U.S. Index (reflects no deduction for fees, expenses or taxes)[Member] | |||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||
| Average Annual Return, Percent | 38.00% | 7.66% | 13.50% | 12.64% | |||||||||||||||||||
| 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% | ||||
| Russell 3000® Index (reflects no deduction for fees, expenses or taxes)[Member] | |||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||
| Average Annual Return, Percent | 17.15% | 13.15% | 14.29% | 14.72% | 10.31% | 10.40% | 10.67% | 10.80% | |||||||||||||||
| First Trust US Equity Opportunities ETF | |||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||
| Average Annual Return, Percent | 37.75% | 7.19% | 12.99% | 12.04% | |||||||||||||||||||
| Performance Inception Date | Apr. 12, 2006 | ||||||||||||||||||||||
| First Trust US Equity Opportunities ETF | After Taxes on Distributions | |||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||
| Average Annual Return, Percent | 37.45% | 7.00% | 12.73% | 11.73% | |||||||||||||||||||
| First Trust US Equity Opportunities ETF | After Taxes on Distributions and Sales | |||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||
| Average Annual Return, Percent | 22.34% | 5.54% | 10.75% | 10.44% | |||||||||||||||||||