First Trust Lunt US Factor Rotation 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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| Lunt Capital Large Cap Factor Rotation Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 9.19% | 5.50% | 9.65% | |||||||||||||||||
| Nasdaq US 500 Large Cap(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 17.32% | 13.80% | 14.37% | |||||||||||||||||
| 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 Lunt US Factor Rotation ETF | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 8.47% | 4.74% | 8.85% | |||||||||||||||||
| Performance Inception Date | Jul. 25, 2018 | |||||||||||||||||||
| First Trust Lunt US Factor Rotation ETF | After Taxes on Distributions | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 8.36% | 4.39% | 8.47% | |||||||||||||||||
| First Trust Lunt US Factor Rotation ETF | After Taxes on Distributions and Sales | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 5.03% | 3.51% | 6.92% | |||||||||||||||||