Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
60 Months Ended |
120 Months Ended |
Jul. 31, 2026 |
Jul. 31, 2026 |
Jul. 31, 2026 |
| C000047995 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Large Cap Core AlphaDEX® Fund
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| Average Annual Return, Percent |
23.01%
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10.83%
|
12.67%
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| C000047996 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Mid Cap Core AlphaDEX® Fund
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| Average Annual Return, Percent |
23.25%
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8.86%
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11.72%
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| C000047997 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Small Cap Core AlphaDEX® Fund
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| Average Annual Return, Percent |
45.58%
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10.49%
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12.39%
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| C000047998 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Large Cap Value AlphaDEX® Fund
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| Average Annual Return, Percent |
30.11%
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11.16%
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11.34%
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| C000047999 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Large Cap Growth AlphaDEX® Fund
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| Average Annual Return, Percent |
12.88%
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9.80%
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13.59%
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| C000048000 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Multi Cap Value AlphaDEX® Fund
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| Average Annual Return, Percent |
30.17%
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10.20%
|
10.83%
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| C000048001 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Multi Cap Growth AlphaDEX® Fund
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| Average Annual Return, Percent |
22.09%
|
9.34%
|
13.57%
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| C000048896 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Consumer Discretionary AlphaDEX® Fund
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| Average Annual Return, Percent |
8.85%
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3.55%
|
7.77%
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| C000048897 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Consumer Staples AlphaDEX® Fund
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| Average Annual Return, Percent |
4.71%
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4.75%
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4.60%
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| C000048898 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Energy AlphaDEX® Fund
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| Average Annual Return, Percent |
43.00%
|
19.30%
|
6.72%
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| C000048899 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Financials AlphaDEX® Fund
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| Average Annual Return, Percent |
17.93%
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11.37%
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13.17%
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| C000048900 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Health Care AlphaDEX® Fund
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| Average Annual Return, Percent |
29.63%
|
1.19%
|
7.72%
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| C000048901 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Industrials/Producer Durables AlphaDEX® Fund
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| Average Annual Return, Percent |
15.16%
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9.04%
|
12.72%
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| C000048902 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Materials AlphaDEX® Fund
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| Average Annual Return, Percent |
35.49%
|
7.58%
|
10.08%
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| C000048903 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Technology AlphaDEX® Fund
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| Average Annual Return, Percent |
24.65%
|
9.95%
|
19.42%
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| C000048904 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Utilities AlphaDEX® Fund
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| Average Annual Return, Percent |
11.49%
|
12.09%
|
8.72%
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| C000099059 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Mid Cap Growth AlphaDEX® Fund
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| Average Annual Return, Percent |
21.30%
|
7.03%
|
12.86%
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| C000099060 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Mid Cap Value AlphaDEX® Fund
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| Average Annual Return, Percent |
22.53%
|
9.06%
|
9.76%
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| C000099061 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Small Cap Growth AlphaDEX® Fund
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| Average Annual Return, Percent |
48.72%
|
11.24%
|
13.92%
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| C000099062 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
First Trust Small Cap Value AlphaDEX® Fund
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| Average Annual Return, Percent |
42.37%
|
9.11%
|
10.68%
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| Standard & Poor's 500 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P 500® Index
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| Average Annual Return, Percent |
19.56%
|
12.86%
|
15.08%
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| S And P Composite 1500 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Composite 1500® Index
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| Average Annual Return, Percent |
19.97%
|
12.48%
|
14.72%
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| Russell 3000 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Russell 3000® Index
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| Average Annual Return, Percent |
19.60%
|
11.82%
|
14.56%
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| Russell 1000 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Russell 1000® Index
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| Average Annual Return, Percent |
18.94%
|
12.12%
|
14.82%
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| Nasdaq US 500 Large CapTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq US 500 Large CapTM Index
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| Average Annual Return, Percent |
17.80%
|
12.35%
|
15.04%
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| Nasdaq AlphaDEX Large Cap CoreTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Large Cap CoreTM Index
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| Average Annual Return, Percent |
23.75%
|
11.49%
|
13.36%
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| Nasdaq AlphaDEX Mid Cap CoreTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Mid Cap CoreTM Index
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| Average Annual Return, Percent |
24.01%
|
9.54%
|
12.43%
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| Nasdaq US 600 Mid CapTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq US 600 Mid CapTM Index
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| Average Annual Return, Percent |
21.51%
|
6.75%
|
10.78%
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| S And P MidCap 400 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P MidCap 400® Index
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| Average Annual Return, Percent |
20.92%
|
8.47%
|
10.91%
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| S And P SmallCap 600 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P SmallCap 600® Index
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| Average Annual Return, Percent |
33.64%
|
7.48%
|
10.75%
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| Nasdaq US 700 Small CapTMIndex [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq US 700 Small CapTM Index
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| Average Annual Return, Percent |
36.82%
|
7.73%
|
11.70%
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| Nasdaq AlphaDEX Small Cap CoreTMIndex [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Small Cap CoreTM Index
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| Average Annual Return, Percent |
46.60%
|
11.23%
|
13.14%
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| Nasdaq AlphaDEX Large Cap ValueTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Large Cap ValueTM Index
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| Average Annual Return, Percent |
30.95%
|
11.84%
|
12.05%
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| Nasdaq US 500 Large Cap ValueTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq US 500 Large Cap ValueTM Index
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| Average Annual Return, Percent |
28.48%
|
11.46%
|
12.56%
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| S And P 500 Value Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P 500® Value Index
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| Average Annual Return, Percent |
19.71%
|
11.57%
|
11.84%
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| S And P 500 Growth Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P 500® Growth Index
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| Average Annual Return, Percent |
19.42%
|
13.32%
|
17.40%
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| Nasdaq US 500 Large Cap GrowthTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq US 500 Large Cap GrowthTM Index
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| Average Annual Return, Percent |
13.98%
|
12.62%
|
16.76%
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| Nasdaq AlphaDEX Large Cap GrowthTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Large Cap GrowthTM Index
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| Average Annual Return, Percent |
13.55%
|
10.45%
|
14.28%
|
| Nasdaq AlphaDEX Multi Cap Value TM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Multi Cap ValueTM Index
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| Average Annual Return, Percent |
31.11%
|
10.95%
|
11.62%
|
| Nasdaq US Multi Cap Value TM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq US Multi Cap ValueTM Index
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| Average Annual Return, Percent |
28.66%
|
11.13%
|
12.33%
|
| S And P Composite 1500 Value Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Composite 1500® Value Index
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| Average Annual Return, Percent |
20.19%
|
11.36%
|
11.73%
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| S And P Composite 1500 Growth Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Composite 1500® Growth Index
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| Average Annual Return, Percent |
19.78%
|
12.86%
|
16.87%
|
| Nasdaq US Multi Cap GrowthTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq US Multi Cap GrowthTM Index
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| Average Annual Return, Percent |
14.38%
|
11.92%
|
16.18%
|
| Nasdaq AlphaDEX Multi Cap GrowthTM Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Multi Cap GrowthTM Index
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| Average Annual Return, Percent |
22.86%
|
10.05%
|
14.33%
|
| StrataQuant Consumer Discretionary Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
StrataQuant® Consumer Discretionary Index
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| Average Annual Return, Percent |
9.50%
|
4.16%
|
8.43%
|
| S And P 500 Consumer Discretionary Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P 500® Consumer Discretionary Index
|
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|
| Average Annual Return, Percent |
7.52%
|
6.81%
|
12.62%
|
| Russell 1000 Consumer Discretionary Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Russell 1000® Consumer Discretionary Index
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|
| Average Annual Return, Percent |
2.33%
|
5.76%
|
12.68%
|
| Russell 1000 Consumer Staples Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Russell 1000® Consumer Staples Index
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|
| Average Annual Return, Percent |
12.63%
|
6.73%
|
6.64%
|
| StrataQuant Consumer Staples Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
StrataQuant® Consumer Staples Index
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|
| Average Annual Return, Percent |
4.69%
|
5.23%
|
5.18%
|
| S And P 500 Consumer Staples Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P 500® Consumer Staples Index
|
|
|
| Average Annual Return, Percent |
10.32%
|
7.69%
|
8.22%
|
| StrataQuant Energy Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
StrataQuant® Energy Index
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|
|
| Average Annual Return, Percent |
44.02%
|
20.13%
|
7.43%
|
| S And P 500 Energy Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P 500® Energy Index
|
|
|
| Average Annual Return, Percent |
41.17%
|
23.99%
|
10.16%
|
| Russell 1000 Energy Index [Member] |
|
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Russell 1000® Energy Index
|
|
|
| Average Annual Return, Percent |
40.15%
|
22.92%
|
9.82%
|
| Russell 1000 Financials Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Russell 1000® Financials Index
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|
| Average Annual Return, Percent |
12.45%
|
13.05%
|
15.40%
|
| S And P 500 Financials Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P 500® Financials Index
|
|
|
| Average Annual Return, Percent |
10.52%
|
11.27%
|
13.68%
|
| StrataQuant Financials Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
StrataQuant® Financials Index
|
|
|
| Average Annual Return, Percent |
18.73%
|
12.07%
|
13.92%
|
| StrataQuant Health Care Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
StrataQuant® Health Care Index
|
|
|
| Average Annual Return, Percent |
30.52%
|
1.81%
|
8.41%
|
| S And P 500 Health Care Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
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|
|
| Line Graph and Table Measure Name |
S&P 500® Health Care Index
|
|
|
| Average Annual Return, Percent |
26.92%
|
6.02%
|
9.97%
|
| Russell 1000 Health Care Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Russell 1000® Health Care Index
|
|
|
| Average Annual Return, Percent |
26.59%
|
5.25%
|
9.94%
|
| Russell 1000 Industrials Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Russell 1000® Industrials Index
|
|
|
| Average Annual Return, Percent |
14.52%
|
8.98%
|
11.89%
|
| S And P 500 Industrials Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
S&P 500® Industrials Index
|
|
|
| Average Annual Return, Percent |
19.86%
|
13.49%
|
13.67%
|
| StrataQuant Industrials Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
StrataQuant® Industrials Index
|
|
|
| Average Annual Return, Percent |
15.77%
|
9.74%
|
13.48%
|
| StrataQuant Materials Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
StrataQuant® Materials Index
|
|
|
| Average Annual Return, Percent |
36.33%
|
8.28%
|
10.83%
|
| S And P 500 Materials Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
S&P 500® Materials Index
|
|
|
| Average Annual Return, Percent |
15.32%
|
5.53%
|
9.64%
|
| Russell 1000 Basic Materials Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Russell 1000® Basic Materials Index
|
|
|
| Average Annual Return, Percent |
25.52%
|
7.91%
|
10.77%
|
| Russell 1000 Technology Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Russell 1000® Technology Index
|
|
|
| Average Annual Return, Percent |
26.91%
|
19.59%
|
25.06%
|
| S And P 500 Information Technology Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
S&P 500® Information Technology Index
|
|
|
| Average Annual Return, Percent |
26.22%
|
20.39%
|
25.21%
|
| StrataQuant Technology Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
StrataQuant Technology® Index
|
|
|
| Average Annual Return, Percent |
25.38%
|
10.55%
|
20.06%
|
| StrataQuant Utilities Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
StrataQuant® Utilities Index
|
|
|
| Average Annual Return, Percent |
12.23%
|
12.88%
|
9.45%
|
| S And P 500 Utilities Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
S&P 500® Utilities Index
|
|
|
| Average Annual Return, Percent |
6.41%
|
9.41%
|
8.94%
|
| Russell 1000 Utilities Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Russell 1000® Utilities Index
|
|
|
| Average Annual Return, Percent |
5.60%
|
9.72%
|
8.30%
|
| S And P MidCap 400 Growth Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
S&P MidCap 400® Growth Index
|
|
|
| Average Annual Return, Percent |
21.18%
|
7.57%
|
10.96%
|
| Nasdaq US 600 Mid Cap GrowthTMIndex [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Nasdaq US 600 Mid Cap GrowthTM Index
|
|
|
| Average Annual Return, Percent |
14.88%
|
3.64%
|
10.48%
|
| Nasdaq AlphaDEX Mid Cap GrowthTMIndex [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Mid Cap GrowthTM Index
|
|
|
| Average Annual Return, Percent |
22.16%
|
7.82%
|
13.69%
|
| Nasdaq AlphaDEX Mid Cap ValueTM Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Mid Cap ValueTM Index
|
|
|
| Average Annual Return, Percent |
23.46%
|
9.88%
|
10.59%
|
| Nasdaq US 600 Mid Cap ValueTM Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Nasdaq US 600 Mid Cap ValueTM Index
|
|
|
| Average Annual Return, Percent |
28.24%
|
9.55%
|
10.44%
|
| S And P MidCap 400 Value Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
S&P MidCap 400® Value Index
|
|
|
| Average Annual Return, Percent |
20.77%
|
9.25%
|
10.55%
|
| S And P SmallCap 600 Growth Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
S&P SmallCap 600® Growth Index
|
|
|
| Average Annual Return, Percent |
30.43%
|
6.69%
|
11.13%
|
| Nasdaq US 700 Small Cap GrowthTM Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Nasdaq US 700 Small Cap GrowthTM Index
|
|
|
| Average Annual Return, Percent |
39.41%
|
7.71%
|
12.58%
|
| Nasdaq AlphaDEX Small Cap GrowthTM Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Small Cap GrowthTM Index
|
|
|
| Average Annual Return, Percent |
49.94%
|
12.10%
|
14.81%
|
| Nasdaq AlphaDEX Small Cap ValueTM Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Nasdaq AlphaDEX Small Cap ValueTM Index
|
|
|
| Average Annual Return, Percent |
43.59%
|
10.01%
|
11.54%
|
| Nasdaq US 700 Small Cap ValueTM Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Nasdaq US 700 Small Cap ValueTM Index
|
|
|
| Average Annual Return, Percent |
34.02%
|
7.51%
|
10.53%
|
| S And P SmallCap 600 Value Index [Member] |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
S&P SmallCap 600® Value Index
|
|
|
| Average Annual Return, Percent |
37.16%
|
8.14%
|
10.19%
|