v3.26.3
Shareholder Report, Line Graph (Details) - USD ($)
 6 Months Ended 12 Months Ended 18 Months Ended 24 Months Ended 30 Months Ended 36 Months Ended 42 Months Ended 48 Months Ended 54 Months Ended 60 Months Ended 66 Months Ended 72 Months Ended 78 Months Ended 84 Months Ended 90 Months Ended 96 Months Ended 102 Months Ended 108 Months Ended 114 Months Ended 120 Months Ended
Jul. 31, 2016
Jan. 31, 2017
Jul. 31, 2026
Jul. 31, 2017
Jan. 31, 2018
Jul. 31, 2018
Jan. 31, 2019
Jul. 31, 2019
Jan. 31, 2020
Jul. 31, 2020
Jan. 31, 2021
Jul. 31, 2021
Jan. 31, 2022
Jul. 31, 2022
Jan. 31, 2023
Jul. 31, 2023
Jan. 31, 2024
Jul. 31, 2024
Jan. 31, 2025
Jul. 31, 2025
Jan. 31, 2026
Jul. 31, 2026
C000047995 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Large Cap Core AlphaDEX® Fund                                      
Accumulated Value $ 10,000 $ 10,711   $ 11,667 $ 13,356 $ 13,268 $ 12,556 $ 13,731 $ 14,277 $ 13,999 $ 16,693 $ 19,705 $ 19,849 $ 18,773 $ 19,738 $ 20,438 $ 21,328 $ 23,684 $ 25,894 $ 26,792 $ 29,678 $ 32,955
C000047996 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Mid Cap Core AlphaDEX® Fund                                      
Accumulated Value 10,000 10,938   11,461 13,047 13,442 12,638 13,605 13,842 12,808 16,907 19,803 19,401 18,667 19,672 20,663 20,944 24,029 25,142 24,568 27,907 30,282
C000047997 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Small Cap Core AlphaDEX® Fund                                      
Accumulated Value 10,000 11,092   11,603 12,886 13,891 12,657 12,985 13,029 11,875 17,250 19,529 19,400 18,260 18,893 19,384 19,285 22,192 23,042 22,091 27,087 32,161
C000047998 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Large Cap Value AlphaDEX® Fund                                      
Accumulated Value 10,000 11,448   12,334 13,762 13,336 12,656 13,249 13,746 11,945 14,494 17,254 18,429 17,640 19,374 19,210 19,438 21,666 22,201 22,507 25,996 29,284
C000047999 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Large Cap Growth AlphaDEX® Fund                                      
Accumulated Value 10,000 9,887   10,909 12,857 13,111 12,300 14,051 14,676 16,313 19,184 22,399 21,006 19,300 19,126 20,982 22,574 24,947 29,522 31,666 32,964 35,749
C000048000 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Multi Cap Value AlphaDEX® Fund                                      
Accumulated Value 10,000 11,435   11,946 13,214 13,177 12,378 12,700 12,974 11,145 14,297 17,203 18,063 17,409 18,968 19,009 19,393 21,816 21,892 21,480 24,767 27,960
C000048001 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Multi Cap Growth AlphaDEX® Fund                                      
Accumulated Value 10,000 10,190   11,185 13,078 13,736 12,777 14,376 14,827 15,846 20,339 22,833 21,073 19,429 19,365 21,081 21,633 24,551 28,187 29,230 32,340 35,692
C000048896 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Consumer Discretionary AlphaDEX® Fund                                      
Accumulated Value 10,000 10,003   10,509 12,390 11,999 11,590 12,374 12,497 11,459 15,191 17,761 16,729 14,487 16,179 16,940 17,045 18,037 19,971 19,423 20,764 21,143
C000048897 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Consumer Staples AlphaDEX® Fund                                      
Accumulated Value 10,000 9,361   9,669 10,484 9,721 9,554 9,801 10,317 10,631 11,482 12,426 13,780 14,283 14,381 14,694 14,312 15,383 15,185 14,969 15,704 15,674
C000048898 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Energy AlphaDEX® Fund                                      
Accumulated Value 10,000 11,079   9,501 10,615 12,015 9,351 7,717 6,358 4,759 6,401 7,931 10,406 13,147 13,760 13,987 13,356 15,116 14,014 13,405 15,802 19,171
C000048899 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Financials AlphaDEX® Fund                                      
Accumulated Value 10,000 11,407   12,399 13,742 13,771 13,026 14,189 14,648 11,699 16,083 20,121 21,658 19,614 21,862 20,250 21,682 25,348 28,912 29,228 31,545 34,461
C000048900 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Health Care AlphaDEX® Fund                                      
Accumulated Value 10,000 9,672   10,872 12,045 12,478 12,137 12,612 13,435 15,482 17,633 19,829 17,967 17,642 18,293 17,343 16,724 17,853 18,173 16,224 18,905 21,030
C000048901 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Industrials/Producer Durables AlphaDEX® Fund                                      
Accumulated Value 10,000 11,688   12,281 14,626 14,439 13,461 14,969 15,601 14,025 17,752 21,488 20,921 19,519 20,720 22,686 23,777 27,054 29,126 28,759 31,920 33,123
C000048902 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Materials AlphaDEX® Fund                                      
Accumulated Value 10,000 11,062   11,402 13,442 12,906 11,179 11,606 11,279 11,051 14,801 18,127 18,536 19,645 22,609 22,085 21,621 22,131 19,880 19,280 24,326 26,120
C000048903 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Technology AlphaDEX® Fund                                      
Accumulated Value 10,000 11,378   13,072 16,109 16,412 17,181 20,219 21,438 26,148 32,526 36,699 34,387 30,591 29,826 35,290 38,441 39,852 46,348 47,307 50,084 58,969
C000048904 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Utilities AlphaDEX® Fund                                      
Accumulated Value 10,000 10,074   10,357 9,790 10,244 10,890 11,443 11,961 11,363 11,680 13,045 13,795 14,830 14,686 14,383 13,558 15,843 17,924 20,700 22,004 23,078
C000099059 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Mid Cap Growth AlphaDEX® Fund                                      
Accumulated Value 10,000 10,367   11,294 13,361 14,125 13,204 15,034 15,601 16,580 22,004 23,881 21,278 19,869 19,871 21,731 21,670 24,995 27,709 27,654 31,083 33,535
C000099060 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Mid Cap Value AlphaDEX® Fund                                      
Accumulated Value 10,000 11,393   11,573 12,709 12,823 12,094 12,276 12,252 10,043 13,291 16,447 17,058 16,661 18,307 18,651 19,041 21,573 21,479 20,705 23,260 25,376
C000099061 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Small Cap Growth AlphaDEX® Fund                                      
Accumulated Value 10,000 10,674   11,712 13,191 14,739 13,317 14,163 14,000 13,484 20,262 21,607 20,188 18,407 18,462 19,581 18,596 21,916 24,585 24,750 30,959 36,812
C000099062 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     First Trust Small Cap Value AlphaDEX® Fund                                      
Accumulated Value 10,000 11,464   11,541 12,621 13,256 12,068 11,972 12,180 10,795 15,046 17,836 18,253 17,468 18,410 18,450 19,164 21,706 20,959 19,371 23,136 27,581
Standard & Poor's 500 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Index                                      
Accumulated Value 10,000 10,596   11,604 13,394 13,488 13,083 14,564 15,920 16,305 18,665 22,247 23,012 21,215 21,121 23,977 25,519 29,288 32,252 34,071 37,522 40,742
Russell 3000 C000047996 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value                                 24,596 28,138 31,070      
Russell 3000 C000047997 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value                                         35,828  
Standard And Poor s 500 C000047998 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value                                       34,074 37,526  
Standard And Poor s 500 C000047999 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value                                         37,525  
S And P Composite 1500 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P Composite 1500® Index                                      
Accumulated Value 10,000 10,641   11,601 13,349 13,495 13,025 14,445 15,704 15,948 18,450 21,931 22,585 20,891 20,899 23,541 24,942 28,621 31,377 32,924 36,302 39,492
Russell 3000 C000048001 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value                                       32,552 35,830  
Russell 3000 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 3000® Index                                      
Accumulated Value 10,000 10,661   11,613 13,343 13,517 13,042 14,470 15,719 16,052 18,939 22,268 22,498 20,631 20,644 23,240 24,595 28,137 31,069 32,551 35,829 38,932
Russell 1000 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Index                                      
Accumulated Value 10,000 10,614   11,595 13,356 13,471 13,065 14,550 15,861 16,300 19,007 22,489 22,869 20,944 20,915 23,656 25,147 28,743 31,861 33,496 36,738 39,841
Nasdaq US 500 Large CapTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US 500 Large CapTM Index                                      
Accumulated Value 10,000 10,608   11,618 13,415 13,490 13,084 14,624 16,018 16,611 19,209 22,679 23,135 21,162 21,024 23,940 25,547 29,289 32,438 34,465 37,371 40,591
Nasdaq AlphaDEX Large Cap CoreTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Large Cap CoreTM Index                                      
Accumulated Value 10,000 10,750   11,744 13,491 13,442 12,753 13,992 14,598 14,354 17,176 20,342 20,551 19,489 20,549 21,342 22,343 24,888 27,287 28,319 31,464 35,041
Nasdaq AlphaDEX Mid Cap CoreTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Mid Cap CoreTM Index                                      
Accumulated Value 10,000 10,979   11,543 13,185 13,626 12,848 13,876 14,164 13,149 17,415 20,463 20,111 19,411 20,519 21,621 21,989 25,305 26,557 26,023 29,656 32,263
Nasdaq US 600 Mid CapTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US 600 Mid CapTM Index                                      
Accumulated Value 10,000 10,844   11,468 12,986 13,439 12,704 13,863 14,301 13,528 17,544 20,079 18,874 17,551 18,346 19,272 19,311 21,833 23,446 22,914 25,969 27,838
S And P MidCap 400 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P MidCap 400® Index                                      
Accumulated Value 10,000 10,906   11,469 12,827 13,131 12,246 13,234 13,624 12,765 16,140 18,762 18,408 17,693 18,838 19,546 19,738 22,557 23,759 23,301 25,596 28,174
S And P SmallCap 600 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P SmallCap 600® Index                                      
Accumulated Value 10,000 11,292   11,766 13,162 14,486 12,998 13,509 13,852 12,337 17,063 19,363 18,881 18,156 18,704 19,110 19,041 21,804 22,175 20,775 24,124 27,765
Nasdaq US 700 Small CapTMIndex [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US 700 Small CapTM Index                                      
Accumulated Value 10,000 11,280   11,914 13,147 14,191 12,956 13,587 13,920 12,819 18,694 20,840 19,367 17,819 18,625 19,282 18,893 21,589 23,286 22,103 26,132 30,242
Nasdaq AlphaDEX Small Cap CoreTMIndex [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Small Cap CoreTM Index                                      
Accumulated Value 10,000 11,130   11,676 13,006 14,063 12,852 13,232 13,320 12,185 17,776 20,188 20,122 18,993 19,717 20,300 20,272 23,400 24,378 23,449 28,849 34,380
Nasdaq AlphaDEX Large Cap ValueTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Large Cap ValueTM Index                                      
Accumulated Value 10,000 11,494   12,420 13,908 13,518 12,865 13,512 14,066 12,254 14,925 17,827 19,102 18,334 20,196 20,087 20,393 22,803 23,428 23,824 27,607 31,198
Nasdaq US 500 Large Cap ValueTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US 500 Large Cap ValueTM Index                                      
Accumulated Value 10,000 10,978   11,694 13,365 12,934 12,488 13,631 14,780 13,527 15,832 18,968 19,981 18,918 19,657 21,112 22,204 24,757 25,829 25,400 29,827 32,635
S And P 500 Value Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Value Index                                      
Accumulated Value 10,000 10,829   11,434 12,925 12,627 12,268 13,419 14,514 13,054 14,871 17,711 18,567 17,707 19,140 20,745 21,928 24,226 25,260 25,580 28,481 30,621
S And P 500 Growth Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Growth Index                                      
Accumulated Value 10,000 10,360   11,697 13,746 14,225 13,780 15,584 17,189 19,408 22,320 26,616 27,135 24,185 22,081 26,120 27,972 33,152 37,983 41,648 45,438 49,737
Nasdaq US 500 Large Cap GrowthTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US 500 Large Cap GrowthTM Index                                      
Accumulated Value 10,000 10,256   11,528 13,430 13,925 13,562 15,448 17,094 19,324 22,198 25,994 25,926 23,170 22,419 26,475 28,514 33,142 37,629 41,320 43,527 47,102
Nasdaq AlphaDEX Large Cap GrowthTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Large Cap GrowthTM Index                                      
Accumulated Value 10,000 9,920   10,981 12,984 13,286 12,486 14,310 14,997 16,725 19,728 23,108 21,728 20,018 19,894 21,894 23,632 26,194 31,094 33,454 34,933 37,989
Nasdaq AlphaDEX Multi Cap Value TM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Multi Cap ValueTM Index                                      
Accumulated Value 10,000 11,482   12,034 13,360 13,371 12,601 12,978 13,309 11,476 14,779 17,853 18,812 18,180 19,870 19,981 20,461 23,096 23,253 22,895 26,499 30,019
Nasdaq US Multi Cap Value TM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US Multi Cap ValueTM Index                                      
Accumulated Value 10,000 11,026   11,699 13,321 12,992 12,476 13,532 14,548 13,178 15,701 18,879 19,768 18,748 19,556 20,865 21,816 24,384 25,403 24,865 29,183 31,995
S And P Composite 1500 Value Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P Composite 1500® Value Index                                      
Accumulated Value 10,000 10,872   11,445 12,900 12,691 12,267 13,362 14,374 12,853 14,849 17,699 18,502 17,681 19,130 20,598 21,654 23,952 25,011 25,208 28,125 30,309
S And P Composite 1500 Growth Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P Composite 1500® Growth Index                                      
Accumulated Value 10,000 10,403   11,680 13,683 14,175 13,666 15,402 16,897 18,891 21,902 25,974 26,333 23,578 21,718 25,475 27,177 32,158 36,529 39,710 43,340 47,557
Nasdaq US Multi Cap GrowthTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US Multi Cap GrowthTM Index                                      
Accumulated Value 10,000 10,303   11,519 13,371 13,919 13,500 15,339 16,851 18,867 22,025 25,523 25,102 22,438 21,821 25,533 27,295 31,673 35,917 39,178 41,411 44,815
Nasdaq AlphaDEX Multi Cap GrowthTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Multi Cap GrowthTM Index                                      
Accumulated Value 10,000 10,226   11,268 13,225 13,939 13,001 14,681 15,193 16,295 20,996 23,646 21,891 20,249 20,243 22,110 22,771 25,922 29,863 31,069 34,487 38,172
StrataQuant Consumer Discretionary Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     StrataQuant® Consumer Discretionary Index                                      
Accumulated Value 10,000 10,036   10,578 12,513 12,154 11,772 12,615 12,786 11,746 15,624 18,324 17,298 15,026 16,845 17,692 17,864 18,953 21,021 20,519 22,004 22,469
S And P 500 Consumer Discretionary Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Consumer Discretionary Index                                      
Accumulated Value 10,000 10,500   11,390 13,544 14,067 13,776 15,363 16,080 18,676 21,386 23,605 23,938 21,176 19,196 22,749 22,926 25,529 32,294 30,518 33,362 32,815
Russell 1000 Consumer Discretionary Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Consumer Discretionary Index                                      
Accumulated Value 10,000 10,422   11,382 13,535 13,782 13,630 15,327 16,199 18,465 22,847 24,924 24,293 21,058 20,184 23,003 23,659 26,268 32,928 32,226 33,857 32,982
Russell 1000 Consumer Staples Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Consumer Staples Index                                      
Accumulated Value 10,000 9,798   10,366 10,691 9,971 10,038 10,981 11,848 11,698 12,192 13,734 15,145 14,995 15,175 15,817 15,281 16,287 16,189 16,885 17,961 19,018
StrataQuant Consumer Staples Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     StrataQuant® Consumer Staples Index                                      
Accumulated Value 10,000 9,391   9,732 10,587 9,855 9,712 10,001 10,565 10,927 11,835 12,846 14,258 14,827 14,980 15,341 14,991 16,165 16,005 15,830 16,665 16,572
S And P 500 Consumer Staples Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Consumer Staples Index                                      
Accumulated Value 10,000 9,767   10,440 11,078 10,379 10,511 11,898 12,796 12,867 13,392 15,209 16,523 16,340 16,501 17,224 16,993 18,591 19,617 19,972 21,514 22,029
StrataQuant Energy Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     StrataQuant® Energy Index                                      
Accumulated Value 10,000 11,122   9,574 10,741 12,201 9,503 7,870 6,514 4,869 6,585 8,187 10,796 13,696 14,354 14,659 14,034 15,939 14,823 14,220 16,820 20,476
S And P 500 Energy Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Energy Index                                      
Accumulated Value 10,000 10,783   10,018 11,494 11,994 10,076 10,076 9,017 6,220 6,979 8,984 12,385 15,042 17,717 17,486 16,941 19,262 18,351 18,646 22,356 26,326
Russell 1000 Energy Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Energy Index                                      
Accumulated Value 10,000 10,806   9,953 11,416 12,021 10,034 9,907 8,853 6,184 7,149 9,091 12,169 15,009 17,298 17,016 16,344 18,652 17,945 18,205 21,671 25,514
Russell 1000 Financials Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Financials Index                                      
Accumulated Value 10,000 11,490   12,559 14,578 14,378 13,924 15,788 16,998 14,842 17,989 22,682 24,606 21,555 23,596 23,391 25,940 30,410 35,759 37,243 39,291 41,882
S And P 500 Financials Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Financials Index                                      
Accumulated Value 10,000 12,260   13,298 15,913 15,090 14,147 15,613 16,731 13,612 16,601 21,128 22,812 19,867 21,800 21,277 23,575 26,833 31,829 32,612 33,532 36,036
StrataQuant Financials Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     StrataQuant® Financials Index                                      
Accumulated Value 10,000 11,446   12,480 13,881 13,957 13,241 14,475 14,997 12,023 16,584 20,830 22,498 20,428 22,835 21,204 22,786 26,728 30,583 31,011 33,585 36,818
StrataQuant Health Care Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     StrataQuant® Health Care Index                                      
Accumulated Value 10,000 9,699   10,940 12,159 12,640 12,334 12,866 13,753 15,904 18,170 20,498 18,624 18,354 19,090 18,161 17,563 18,810 19,209 17,177 20,081 22,421
S And P 500 Health Care Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Health Care Index                                      
Accumulated Value 10,000 9,493   10,843 12,051 12,362 12,700 13,012 14,272 15,664 17,428 19,970 19,491 19,678 19,981 20,299 21,330 22,947 22,874 20,371 24,333 25,860
Russell 1000 Health Care Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Health Care Index                                      
Accumulated Value 10,000 9,441   10,801 12,022 12,238 12,582 12,762 14,105 15,157 16,682 19,299 19,346 19,649 19,962 20,245 21,387 22,976 22,744 20,374 24,402 25,788
Russell 1000 Industrials Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Industrials Index                                      
Accumulated Value 10,000 11,045   11,984 14,086 13,765 13,052 14,444 15,191 13,640 16,323 20,002 18,976 17,388 18,325 19,714 20,779 23,293 25,904 26,855 28,732 30,755
S And P 500 Industrials Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Industrials Index                                      
Accumulated Value 10,000 10,950   11,830 13,761 13,368 12,626 13,847 14,594 13,057 15,581 19,120 18,787 17,968 19,332 21,134 21,825 24,889 27,169 30,035 32,952 35,998
StrataQuant Industrials Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     StrataQuant® Industrials Index                                      
Accumulated Value 10,000 11,754   12,391 14,807 14,664 13,700 15,287 15,985 14,420 18,310 22,239 21,723 20,324 21,675 23,808 25,039 28,585 30,877 30,581 34,055 35,406
StrataQuant Materials Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     StrataQuant® Materials Index                                      
Accumulated Value 10,000 11,098   11,479 13,584 13,088 11,370 11,851 11,563 11,368 15,285 18,780 19,272 20,500 23,653 23,168 22,753 23,365 21,045 20,506 25,951 27,957
S And P 500 Materials Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Materials Index                                      
Accumulated Value 10,000 10,811   11,457 13,325 12,768 11,513 12,749 12,757 13,551 16,024 19,177 19,465 18,207 19,975 20,421 19,822 22,405 21,773 21,767 24,779 25,103
Russell 1000 Basic Materials Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Basic Materials Index                                      
Accumulated Value 10,000 10,879   11,511 13,328 12,837 11,543 12,752 12,808 13,478 15,559 18,997 18,760 17,947 20,365 20,570 20,091 22,088 21,253 22,146 26,757 27,801
Russell 1000 Technology Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Technology Index                                      
Accumulated Value 10,000 11,107   12,933 15,746 16,530 15,785 18,814 22,193 26,338 31,487 38,254 39,581 33,719 31,082 43,497 48,647 58,454 64,738 73,736 82,349 93,574
S And P 500 Information Technology Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Information Technology Index                                      
Accumulated Value 10,000 11,053   12,947 15,818 16,634 15,674 19,250 22,897 26,740 31,400 37,445 39,699 35,384 33,470 44,883 50,233 60,681 64,098 75,033 80,525 94,698
StrataQuant Technology Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     StrataQuant Technology® Index                                      
Accumulated Value 10,000 11,373   13,106 16,206 16,566 17,344 20,477 21,797 26,676 33,307 37,714 35,447 31,619 30,911 36,685 39,964 41,543 48,476 49,649 52,708 62,253
StrataQuant Utilities Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     StrataQuant® Utilities Index                                      
Accumulated Value 10,000 10,109   10,426 9,886 10,387 11,081 11,667 12,231 11,638 12,009 13,459 14,268 15,420 15,314 15,049 14,230 16,688 18,958 21,974 23,437 24,659
S And P 500 Utilities Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P 500® Utilities Index                                      
Accumulated Value 10,000 9,607   10,571 10,311 10,869 11,453 12,666 14,923 13,405 13,931 15,017 16,003 17,356 16,466 16,239 15,143 18,247 19,836 22,125 22,667 23,544
Russell 1000 Utilities Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Russell 1000® Utilities Index                                      
Accumulated Value 10,000 9,682   10,089 10,133 10,204 10,675 11,709 13,395 12,096 12,780 13,969 14,800 16,002 15,219 15,119 14,402 17,376 18,902 21,030 21,444 22,204
S And P MidCap 400 Growth Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P MidCap 400® Growth Index                                      
Accumulated Value 10,000 10,596   11,372 13,007 13,232 12,216 13,471 13,943 14,195 17,648 19,642 18,463 17,431 17,886 19,140 19,546 22,835 23,596 23,346 25,412 28,291
Nasdaq US 600 Mid Cap GrowthTMIndex [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US 600 Mid Cap GrowthTM Index                                      
Accumulated Value 10,000 10,451   11,254 12,874 13,618 12,958 14,628 15,317 16,282 21,393 22,655 19,461 17,482 17,793 19,029 18,930 21,363 23,640 23,584 25,807 27,095
Nasdaq AlphaDEX Mid Cap GrowthTMIndex [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Mid Cap GrowthTM Index                                      
Accumulated Value 10,000 10,408   11,381 13,509 14,335 13,446 15,366 16,004 17,071 22,741 24,769 22,151 20,769 20,839 22,867 22,890 26,498 29,484 29,537 33,323 36,090
Nasdaq AlphaDEX Mid Cap ValueTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Mid Cap ValueTM Index                                      
Accumulated Value 10,000 11,440   11,661 12,857 13,022 12,317 12,553 12,579 10,346 13,749 17,079 17,783 17,427 19,219 19,661 20,154 22,925 22,907 22,165 24,997 27,366
Nasdaq US 600 Mid Cap ValueTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US 600 Mid Cap ValueTM Index                                      
Accumulated Value 10,000 11,237   11,673 13,076 13,208 12,395 13,056 13,268 10,897 13,901 17,107 17,389 16,692 17,902 18,498 18,674 21,157 21,989 21,043 24,661 26,985
S And P MidCap 400 Value Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P MidCap 400® Value Index                                      
Accumulated Value 10,000 11,177   11,491 12,546 12,927 12,189 12,896 13,190 11,168 14,436 17,517 17,907 17,508 19,330 19,427 19,406 21,637 23,256 22,572 25,057 27,259
S And P SmallCap 600 Growth Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P SmallCap 600® Growth Index                                      
Accumulated Value 10,000 11,218   11,850 13,306 14,875 13,445 14,159 14,689 13,935 18,977 20,778 19,679 18,661 18,529 19,422 19,721 22,977 23,067 22,026 24,500 28,724
Nasdaq US 700 Small Cap GrowthTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US 700 Small Cap GrowthTM Index                                      
Accumulated Value 10,000 10,989   11,930 13,137 14,504 13,334 14,330 14,824 14,830 22,005 22,558 19,436 17,204 17,824 18,940 18,379 21,220 24,285 23,454 27,997 32,696
Nasdaq AlphaDEX Small Cap GrowthTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Small Cap GrowthTM Index                                      
Accumulated Value 10,000 10,717   11,803 13,350 14,969 13,576 14,495 14,379 13,907 21,000 22,470 21,083 19,293 19,430 20,684 19,718 23,316 26,259 26,534 33,327 39,781
Nasdaq AlphaDEX Small Cap ValueTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq AlphaDEX Small Cap ValueTM Index                                      
Accumulated Value 10,000 11,511   11,626 12,750 13,439 12,272 12,226 12,489 11,115 15,552 18,507 19,016 18,259 19,316 19,438 20,287 23,081 22,377 20,763 24,904 29,812
Nasdaq US 700 Small Cap ValueTM Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     Nasdaq US 700 Small Cap ValueTM Index                                      
Accumulated Value 10,000 11,584   11,893 13,141 13,874 12,567 12,869 13,064 10,986 15,703 18,948 18,993 18,121 19,134 19,304 19,102 21,596 21,741 20,308 23,751 27,213
S And P SmallCap 600 Value Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name     S&P SmallCap 600® Value Index                                      
Accumulated Value $ 10,000 $ 11,356   $ 11,660 $ 12,990 $ 14,077 $ 12,562 $ 12,884 $ 13,036 $ 10,782 $ 15,182 $ 17,842 $ 17,897 $ 17,439 $ 18,628 $ 18,532 $ 18,092 $ 20,347 $ 20,937 $ 19,239 $ 23,360 $ 26,382