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First Trust Capital Strength 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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The Capital Strength(TM) Index (reflects no deduction for fees, expenses or taxes)[Member]                                        
Prospectus [Line Items]                                        
Average Annual Return, Percent [1]   7.00%           8.47%     11.33%                
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 Capital Strength ETF                                        
Prospectus [Line Items]                                        
Average Annual Return, Percent   6.39%           7.85%     10.66%         9.72%        
Performance Inception Date Jul. 06, 2006                                      
First Trust Capital Strength ETF | After Taxes on Distributions                                        
Prospectus [Line Items]                                        
Average Annual Return, Percent   5.94%           7.29%     10.08%         9.11%        
First Trust Capital Strength ETF | After Taxes on Distributions and Sales                                        
Prospectus [Line Items]                                        
Average Annual Return, Percent   3.78%           5.91%     8.50%         8.03%        
[1] On June 4, 2013, the Fund’s underlying index changed from the Credit Suisse U.S. Value Index, Powered by HOLTTM to The Capital StrengthTM Index. Therefore, the Fund’s performance and historical returns shown for the periods prior to June 4, 2013, are not necessarily indicative of the performance that the Fund, based on its current index, would have generated. Since the Fund’s new underlying index had an inception date of March 20, 2013, it was not in existence for some of the periods disclosed.