First Trust Indxx Aerospace and Defense 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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| Indxx US Aerospace & Defense Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 42.13% | 26.97% | ||||||||||||||||||
| 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% | |
| S&P Composite 1500® Aerospace & Defense Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 44.15% | 23.80% | ||||||||||||||||||
| First Trust Indxx Aerospace and Defense ETF | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 41.24% | 26.20% | ||||||||||||||||||
| Performance Inception Date | Oct. 25, 2022 | |||||||||||||||||||
| First Trust Indxx Aerospace and Defense ETF | After Taxes on Distributions | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 40.98% | 25.89% | ||||||||||||||||||
| First Trust Indxx Aerospace and Defense ETF | After Taxes on Distributions and Sales | ||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||
| Average Annual Return, Percent | 24.39% | 20.85% | ||||||||||||||||||