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Shareholder Report, Average Annual Return (Details)
 2 Months Ended 10 Months Ended 12 Months Ended 23 Months Ended 31 Months Ended 41 Months Ended 42 Months Ended 60 Months Ended 83 Months Ended 84 Months Ended 120 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
C000051966 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust STOXX® European Select Dividend Index Fund                
Average Annual Return, Percent     37.86%         15.81%     8.39%
C000051967 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Alerian Disruptive Technology Real Estate ETF                
Average Annual Return, Percent     (7.43%)         2.91%     2.56%
C000054156 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Dow Jones Global Select Dividend Index Fund                
Average Annual Return, Percent     24.53%         16.45%     8.69%
C000066484 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Global Wind Energy ETF                
Average Annual Return, Percent     7.60%         3.53%     8.83%
C000071160 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Alerian U.S. NextGen Infrastructure ETF                
Average Annual Return, Percent     12.94%         14.12%     7.40%
C000081044 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust NASDAQ® Clean Edge® Smart Grid Infrastructure Index Fund                
Average Annual Return, Percent     20.10%         20.42%     18.26%
C000087410 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Indxx Global Natural Resources Income ETF                
Average Annual Return, Percent     15.59%         16.07%     8.61%
C000087411 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Indxx Global Agriculture ETF                
Average Annual Return, Percent     1.47%         5.88%     1.63%
C000092838 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Indxx NextG ETF                
Average Annual Return, Percent     20.36%         14.05%     13.22%
C000101722 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust S-Network Future Vehicles & Technology ETF                
Average Annual Return, Percent     25.78%         14.96%     10.15%
C000102221 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Cloud Computing ETF                
Average Annual Return, Percent     31.34%         11.58%     17.36%
C000146603 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust International Equity Opportunities ETF                
Average Annual Return, Percent     24.66%         1.96%     10.06%
C000159087 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Nasdaq Cybersecurity ETF                
Average Annual Return, Percent     28.49%         17.35%     16.70%
C000204700 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust IPOX® Europe Equity Opportunities ETF                
Average Annual Return, Percent     21.83%         6.97%   8.95%  
C000205597 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Dow Jones International Internet ETF                
Average Annual Return, Percent     32.62%         0.19% 11.14%    
C000234334 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Indxx Metaverse ETF                
Average Annual Return, Percent     34.40%     16.40%          
C000234707 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Nasdaq Lux Digital Health Solutions ETF                
Average Annual Return, Percent     2.05%       (4.46%)        
C000240529 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Bloomberg Emerging Market Democracies ETF                
Average Annual Return, Percent     24.91%   18.59%            
C000245005 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Emerging Markets Human Flourishing ETF                
Average Annual Return, Percent     26.61% 25.40%              
C000253539 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Bloomberg Artificial Intelligence ETF                
Average Annual Return, Percent   32.16%                  
C000261670 [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     First Trust Bloomberg Nuclear Power ETF                
Average Annual Return, Percent 8.07%                    
MSCI Europe Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI Europe Index                
Average Annual Return, Percent     15.08%         12.19%   8.59% 8.14%
MSCI World Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI World Index                
Average Annual Return, Percent     17.25%         14.41%     12.43%
Russell 3000 Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Russell 3000® Index                
Average Annual Return, Percent     17.41%       12.74% 15.74%     14.71%
MSCI ACWI Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI ACWI Index                
Average Annual Return, Percent 5.65%   17.27%     12.52%   13.54%     11.91%
Standard & Poor's 500 Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     S&P 500® Index                
Average Annual Return, Percent   14.33% 17.60%         16.47%     15.30%
MSCI ACWI ex USA Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI ACWI ex USA Index                
Average Annual Return, Percent     16.45%         10.26% 8.68%   8.23%
MSCI Emerging Markets Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI Emerging Markets Index                
Average Annual Return, Percent     17.32% 24.72% 16.03%            
STOXX Europe Select Dividend 30 Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     STOXX® Europe Select Dividend 30 Index                
Average Annual Return, Percent     37.23%         15.80%     8.64%
STOXX Europe 600 Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     STOXX® Europe 600 Index                
Average Annual Return, Percent     15.39%         11.94%     8.17%
Alerian Disruptive Technology Real Estate Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Alerian Disruptive Technology Real Estate Index                
Average Annual Return, Percent [1],[2]     (8.36%)            
FTSE EPRA NAREIT Developed Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     FTSE EPRA/NAREIT Developed Index                
Average Annual Return, Percent     0.74%         6.54%     4.75%
S And P Global REIT Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     S&P Global REIT Index                
Average Annual Return, Percent     (1.24%)         6.58%     4.37%
MSCI World REIT Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI World REIT Index                
Average Annual Return, Percent     (4.16%)         5.24%     5.19%
MSCI World Real Estate Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI World Real Estate Index                
Average Annual Return, Percent [2]     (0.96%)         5.08%    
Dow Jones World Developed Markets Index SM [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Dow Jones World Developed Markets IndexSM                
Average Annual Return, Percent     17.50%         14.21%     12.33%
Dow Jones Global Select Dividend Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Dow Jones Global Select Dividend Index                
Average Annual Return, Percent     24.19%         16.58%     8.91%
ISE Clean Edge Global Wind Energy TM Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     ISE Clean Edge Global Wind EnergyTM Index                
Average Annual Return, Percent     6.39%         3.96%     9.51%
MSCI USA Infrastructure Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI USA Infrastructure Index                
Average Annual Return, Percent     12.67%         11.60%     9.58%
MSCI World Industrials Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI World Industrials Index                
Average Annual Return, Percent     17.64%         14.89%     12.31%
Alerian U S NextGen Infrastructure Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Alerian U.S. NextGen Infrastructure Index                
Average Annual Return, Percent [3]     13.63%            
Nasdaq Clean Edge Smart Grid InfrastructureTM Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Nasdaq Clean Edge Smart Grid InfrastructureTM Index                
Average Annual Return, Percent     20.84%         21.26%     19.18%
S And P Composite 1500 Industrials Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     S&P Composite 1500® Industrials Index                
Average Annual Return, Percent     14.84%         17.11%     14.00%
MSCI ACWI Materials Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI ACWI Materials Index                
Average Annual Return, Percent     5.19%         8.92%     10.10%
Indxx Global Natural Resources Income Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Indxx Global Natural Resources Income Index                
Average Annual Return, Percent [4]     16.54%         17.32%     10.64%
Indxx Global Agriculture Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Indxx Global Agriculture Index                
Average Annual Return, Percent [5]     2.30%         7.32%     5.73%
MSCI ACWI Information Technology Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI ACWI Information Technology Index                
Average Annual Return, Percent     28.09%         19.80%     22.25%
Indxx 5G And NextG Thematic IndexSM [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Indxx 5G & NextG Thematic IndexSM                
Average Annual Return, Percent [6],[7]     21.30%         15.26%    
S Network Electric And Future Vehicle Ecosystem Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     S-Network Electric & Future Vehicle Ecosystem Index                
Average Annual Return, Percent [8]     25.70%            
S And P Composite 1500 Information Technology Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     S&P Composite 1500® Information Technology Index                
Average Annual Return, Percent     27.70%         23.07%     24.76%
ISE CTA Cloud ComputingTMIndex [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     ISE CTA Cloud ComputingTMIndex                
Average Annual Return, Percent [9]     32.18%         12.25%     18.01%
IPOX International Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     IPOX® International Index                
Average Annual Return, Percent     25.63%         2.96%     11.07%
Nasdaq CTA CybersecurityTM Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Nasdaq CTA CybersecurityTM Index                
Average Annual Return, Percent     29.30%         18.12%     17.52%
IPOX 100 Europe Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     IPOX®-100 Europe Index                
Average Annual Return, Percent     23.36%         8.16%   10.24%  
MSCI ACWI ex USA Information Technology Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     MSCI ACWI ex-USA Information Technology Index                
Average Annual Return, Percent     24.39%         13.00% 16.46%    
Dow Jones International Internet Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Dow Jones International Internet Index                
Average Annual Return, Percent     32.35%         0.82% 11.84%    
Indxx Metaverse Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Indxx Metaverse Index                
Average Annual Return, Percent     35.34%     17.40%          
S And P Composite 1500 Health Care Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     S&P Composite 1500® Health Care Index                
Average Annual Return, Percent     (7.83%)       1.93%        
Nasdaq Lux Health Tech Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Nasdaq Lux Health TechTM Index                
Average Annual Return, Percent     2.73%       (3.85%)        
Bloomberg Emerging Market Democracies Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Bloomberg Emerging Market Democracies Index                
Average Annual Return, Percent     26.03%   20.58%            
Emerging Markets Human Flourishing Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Emerging Markets Human Flourishing Index                
Average Annual Return, Percent     27.96% 26.65%              
Bloomberg Artificial Intelligence Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Bloomberg Artificial Intelligence Index                
Average Annual Return, Percent   33.02%                  
Bloomberg Nuclear Power Total Return Index [Member]                      
Average Annual Return [Line Items]                      
Line Graph and Table Measure Name     Bloomberg Nuclear Power Total Return Index                
Average Annual Return, Percent 8.18%                    
[1] On September 30, 2022, the Fund’s underlying index changed from the FTSE EPRA/NAREIT Developed Index to the Alerian Disruptive Technology Real Estate Index. Therefore, the Fund’s performance and historical returns shown for periods prior to this date are not necessarily indicative of the performance the Fund, based on this current index, would have generated.
[2] Performance data is not available for all the periods shown in the table for the index because performance data does not exist for some of the entire periods.
[3] On July 29, 2022, the Fund’s underlying index changed from the ISE Global Engineering and ConstructionTM Index to the Alerian U.S. NextGen Infrastructure Index. Therefore, the Fund’s performance and historical returns shown for the periods prior to this date are not necessarily indicative of the performance that the Fund, based on its current index, would have generated. Since the Fund’s current underlying index had an inception date of April 30, 2021, it was not in existence for all the periods shown.
[4] Effective on the close of business on December 18, 2015, the Fund’s underlying index changed from the ISE Global CopperTM Index to the Indxx Global Natural Resources Income Index. Therefore, the Fund’s performance and total returns shown for the period prior to December 18, 2015 are not necessarily indicative of the performance the Fund, based on its current index, would have generated.
[5] Effective on the close of business on December 18, 2015, the Fund’s underlying index changed from the ISE Global PlatinumTM Index to the Indxx Global Agriculture Index. Therefore, the Fund’s performance and total returns shown for the period prior to December 18, 2015 are not necessarily indicative of the performance the Fund, based on its current index, would have generated.
[6] On May 30, 2019, the Fund’s underlying index changed from the Nasdaq CTA SmartphoneTM Index to the Indxx 5G & NextG Thematic IndexSM. Therefore, the Fund’s performance and historical returns shown for periods prior to this date are not necessarily indicative of the performance that the Fund, based on this current index, would have generated.
[7] Performance data is not available for all the periods shown in the table for the index because performance data does not exist for some of the entire periods.
[8] On January 26, 2022, the Fund’s underlying index changed from the Nasdaq Global AutoTM Index to the S-Network Electric & Future Vehicle Ecosystem Index. Therefore, the Fund’s performance and historical returns shown for periods prior to this date are not necessarily indicative of the performance that the Fund, based on its current index, would have generated. Since the Fund’s current underlying index had an inception date of May 11, 2021, it was not in existence for all the periods disclosed.
[9] On June 24, 2019, the Fund’s underlying index changed its methodology and changed its name from “ISE Cloud ComputingTM Index” to “ISE CTA Cloud ComputingTM Index.”