v3.26.1
First Trust Dividend 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 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%            
[1] Because the Fund’s underlying Index has an inception date of March 7, 2022, performance data for the Index is not available for all periods shown in the table because performance data does not exist for some of the entire periods.
[2] On April 29, 2022, the Fund's underlying index changed from the Nasdaq AlphaDEX® Total US Market Index to The Dividend StrengthTM Index. Therefore, the Fund’s performance and total returns shown are not necessarily indicative of the performance the Fund, based on its current index, would have generated.
[3] Performance data is not available for all the periods shown in the table because performance data does not exist for the periods shown.