v3.26.1
First Trust Value Line Dividend Index Fund 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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Value Line® Dividend Index (reflects no deduction for fees, expenses or taxes)[Member]                                        
Prospectus [Line Items]                                        
Average Annual Return, Percent [1],[2]   8.96%           8.72%     10.07%                
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 500® Value Index (reflects no deduction for fees, expenses or taxes)[Member]                                        
Prospectus [Line Items]                                        
Average Annual Return, Percent   13.19%           12.96%     11.73%                 9.33%
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% [1]           12.43% [1]     10.83% [1]     8.12%           [1]
First Trust Value Line Dividend Index Fund                                        
Prospectus [Line Items]                                        
Average Annual Return, Percent   8.19%           7.95%     9.23%                 9.19%
Performance Inception Date Aug. 19, 2003                                      
First Trust Value Line Dividend Index Fund | After Taxes on Distributions                                        
Prospectus [Line Items]                                        
Average Annual Return, Percent   7.15%           6.99%     8.22%                 7.84%
First Trust Value Line Dividend Index Fund | After Taxes on Distributions and Sales                                        
Prospectus [Line Items]                                        
Average Annual Return, Percent   4.84%           5.79%     7.00%                 7.09%
[1] Performance data is not available for all the periods shown in the table because performance data does not exist for the periods shown.
[2] On December 15, 2006, the Fund acquired the assets and adopted the financial and performance history of First Trust Value Line® Dividend Fund (the “Predecessor FVD Fund,” a closed-end fund), which had an inception date of August 19, 2003. The inception date total returns at Net Asset Value (“NAV”) include the sales load of $0.675 per share on the initial offering. The investment goals, strategies and policies of the Fund are substantially similar to those of the Predecessor FVD Fund. The inception date of the Index was July 3, 2006. Returns for the Index are only disclosed for those periods in which the Index was in existence for the entire period. The cumulative total returns for the period from the reorganization date (12/15/06) through period end (12/31/25) were 341.52% and 343.63% at NAV and Market Price, respectively. That compares to an Index return of 411.85% for the same period. The average annual total returns for the period from the reorganization date (12/15/06) through period end (12/31/25) were 8.11% and 8.14% at NAV and Market Value, respectively. That compares to an Index return of 8.95% for the same period.