First Trust Morningstar Dividend Leaders 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
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
Morningstar® Dividend Leaders Index(SM) (reflects no deduction for fees, expenses or taxes)[Member]
Prospectus [Line Items]
Average Annual Return, Percent		15.49%						13.54%			11.34%								8.82%
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%
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 Morningstar Dividend Leaders Index Fund
Prospectus [Line Items]
Average Annual Return, Percent		14.88%						12.98%			10.78%								8.28%
Performance Inception Date	Mar. 09, 2006
First Trust Morningstar Dividend Leaders Index Fund \| After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent		12.97%						11.10%			8.99%								6.62%
First Trust Morningstar Dividend Leaders Index Fund \| After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent		8.76%						9.40%			7.84%								5.95%