First Trust Dividend Strength ETF Average Annual Total Returns |
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| The Dividend Strength(TM) Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||
| Average Annual Return, Percent | [1],[2] | 14.23% | ||||||||||||||||||||||||||||
| 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% | |||||||||||
| Dow Jones U.S. Select Dividend Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||
| Average Annual Return, Percent | 12.12% | [3] | 12.43% | [3] | 10.83% | [3] | 8.12% | [3] | ||||||||||||||||||||||
| Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||
| Average Annual Return, Percent | 15.91% | 11.33% | 10.53% | 7.68% | 8.20% | |||||||||||||||||||||||||
| First Trust Dividend Strength ETF | ||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||
| Average Annual Return, Percent | 13.35% | 8.73% | 10.38% | 7.06% | ||||||||||||||||||||||||||
| Performance Inception Date | Dec. 05, 2006 | |||||||||||||||||||||||||||||
| First Trust Dividend Strength ETF | After Taxes on Distributions | ||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||
| Average Annual Return, Percent | 12.58% | 7.93% | 9.71% | 6.48% | ||||||||||||||||||||||||||
| First Trust Dividend Strength ETF | After Taxes on Distributions and Sales | ||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||
| Average Annual Return, Percent | 7.88% | 6.48% | 8.20% | 5.60% | ||||||||||||||||||||||||||
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