v3.26.1
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 42 Months Ended 60 Months Ended 120 Months Ended
Apr. 30, 2026
Apr. 30, 2016
Apr. 30, 2026
Apr. 30, 2026
Apr. 30, 2026
C000049094          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012060          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000038163          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012199          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012048          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012050          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012194          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012051          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012052          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012053          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012054          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012055          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012059          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012061          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000012062          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000141932          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
C000050169          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Fund        
Without Sales Load [Member] | C000049094          
Average Annual Return [Line Items]          
Average Annual Return, Percent 44.51%     13.16% 10.23%
Without Sales Load [Member] | C000012060          
Average Annual Return [Line Items]          
Average Annual Return, Percent 30.62%     12.05% 14.69%
Without Sales Load [Member] | C000038163          
Average Annual Return [Line Items]          
Average Annual Return, Percent 34.51%     12.40% 15.02%
Without Sales Load [Member] | C000012199          
Average Annual Return [Line Items]          
Average Annual Return, Percent 28.31%     11.00% 14.69%
Without Sales Load [Member] | C000012048          
Average Annual Return [Line Items]          
Average Annual Return, Percent 40.87%     8.59% 10.75%
Without Sales Load [Member] | C000012050          
Average Annual Return [Line Items]          
Average Annual Return, Percent 15.33%     6.29% 11.87%
Without Sales Load [Member] | C000012194          
Average Annual Return [Line Items]          
Average Annual Return, Percent 3.83%     5.93% 9.23%
Without Sales Load [Member] | C000012051          
Average Annual Return [Line Items]          
Average Annual Return, Percent 52.20%     22.80% 8.97%
Without Sales Load [Member] | C000012052          
Average Annual Return [Line Items]          
Average Annual Return, Percent 14.60%     9.33% 13.77%
Without Sales Load [Member] | C000012053          
Average Annual Return [Line Items]          
Average Annual Return, Percent 14.19%     10.93% 12.99%
Without Sales Load [Member] | C000012054          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.98%     4.34% 9.20%
Without Sales Load [Member] | C000012055          
Average Annual Return [Line Items]          
Average Annual Return, Percent 23.95%     8.58% 12.59%
Without Sales Load [Member] | C000012059          
Average Annual Return [Line Items]          
Average Annual Return, Percent 52.57%     18.97% 24.64%
Without Sales Load [Member] | C000012061          
Average Annual Return [Line Items]          
Average Annual Return, Percent 34.90%     5.01% 9.98%
Without Sales Load [Member] | C000012062          
Average Annual Return [Line Items]          
Average Annual Return, Percent 18.96%     10.10% 9.84%
Without Sales Load [Member] | C000065074          
Average Annual Return [Line Items]          
Average Annual Return, Percent 78.76%     (0.90%) 10.37%
Without Sales Load [Member] | C000237280          
Average Annual Return [Line Items]          
Average Annual Return, Percent 16.71%   8.33%    
Without Sales Load [Member] | C000141932          
Average Annual Return [Line Items]          
Average Annual Return, Percent 17.25%     3.34% 4.35%
Without Sales Load [Member] | C000050169          
Average Annual Return [Line Items]          
Average Annual Return, Percent 16.39%     (0.62%) 1.93%
S&P Developed ex US Broad Market Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name S&P Developed ex US Broad Market Index (Net)        
Average Annual Return, Percent 32.92%     8.99% 9.26%
S&P Total Market Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name S&P Total Market Index        
Average Annual Return, Percent 31.37%     11.86% 14.71%
MSCI USA Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name MSCI USA Index        
Average Annual Return, Percent 30.77%     12.67% 15.24%
MSCI USA Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name MSCI USA Index        
Average Annual Return, Percent 30.77%     12.67% 15.24%
Russell 3000 Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 3000 Index        
Average Annual Return, Percent 31.01%     11.91% 14.75%
Russell 3000 Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 3000 Index        
Average Annual Return, Percent 31.01%     11.91% 14.75%
Russell 3000 Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 3000 Index        
Average Annual Return, Percent 31.01%     11.91% 14.75%
Russell 3000 Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 3000 Index        
Average Annual Return, Percent 31.01%     11.91% 14.75%
S&P Total Market Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name S&P Total Market Index        
Average Annual Return, Percent 31.37%     11.86% 14.71%
Russell 3000 Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 3000 Index        
Average Annual Return, Percent 31.01%     11.91% 14.75%
Russell 3000 Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 3000 Index        
Average Annual Return, Percent 31.01%     11.91% 14.75%
Russell 3000 Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 3000 Index        
Average Annual Return, Percent 31.01%     11.91% 14.75%
Russell 3000 Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 3000 Index        
Average Annual Return, Percent 31.01%     11.91% 14.75%
S&P Total Market Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name S&P Total Market Index        
Average Annual Return, Percent 31.37%     11.86% 14.71%
Russell 3000 Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 3000 Index        
Average Annual Return, Percent 31.01%     11.91% 14.75%
S&P Global Broad Market Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name S&P Global Broad Market Index (Net) S&P Global Broad Market Index (Net)      
Average Annual Return, Percent 31.49%     9.97% 11.84%
FTSE All-World Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name FTSE All-World Index (Net)        
Average Annual Return, Percent 30.87%   19.06%    
FTSE All-World Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name FTSE All-World Index (Net)        
Average Annual Return, Percent 30.87%     10.67% 12.22%
FTSE All World ex-US Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name FTSE All World ex-US Index (Net)        
Average Annual Return, Percent 32.33%     8.47% 9.20%
Dow Jones EPAC Select Dividend Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Dow Jones EPAC Select Dividend Index (Net)        
Average Annual Return, Percent 44.00%     13.02% 10.18%
Dow Jones U.S. Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Dow Jones U.S. Index        
Average Annual Return, Percent 30.87%     12.26% 14.90%
MSCI KLD 400 Social Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name MSCI KLD 400 Social Index        
Average Annual Return, Percent 34.85%     12.65% 15.36%
MSCI USA Extended ESG Select Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name MSCI USA Extended ESG Select Index (Spliced)        
Average Annual Return, Percent 28.72%     11.28% 15.04%
Russell 1000 Basic Materials RIC 22.5/45 Capped Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 1000 Basic Materials RIC 22.5/45 Capped Index (Spliced)        
Average Annual Return, Percent 41.44%     9.02% 11.18%
Russell 1000 Cnsmr Discret. 40 Act 15/22.5 Daily Capd Indx (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 1000 Consumer Discretionary 40 Act 15/22.5 Daily Capped Index (Spliced)        
Average Annual Return, Percent 15.71%     6.65% 12.30%
Russell 1000 Consumer Staples RIC 22.5/45 Capped Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 1000 Consumer Staples RIC 22.5/45 Capped Index (Spliced)        
Average Annual Return, Percent 4.20%     6.35% 9.67%
Russell 1000 Energy RIC 22.5/45 Capped Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 1000 Energy RIC 22.5/45 Capped Index (Spliced)        
Average Annual Return, Percent 52.78%     23.29% 9.41%
Dow Jones U.S. Financial Services Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Dow Jones U.S. Financial Services Index        
Average Annual Return, Percent 14.98%     9.74% 14.23%
Russell 1000 Financials 40 Act 15/22.5 Daily Capped Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 1000 Financials 40 Act 15/22.5 Daily Capped Index (Spliced)        
Average Annual Return, Percent 14.58%     11.37% 13.43%
Russell 1000 Health Care RIC 22.5/45 Capped Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 1000 Health Care RIC 22.5/45 Capped Index (Spliced)        
Average Annual Return, Percent 6.36%     4.73% 9.62%
Russell 1000 Industrials 40 Act 15/22.5 Daily Capped Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 1000 Industrials 40 Act 15/22.5 Daily Capped Index (Spliced)        
Average Annual Return, Percent 24.40%     8.99% 13.05%
Russell 1000 Technology RIC 22.5/45 Capped Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 1000 Technology RIC 22.5/45 Capped Index (Spliced)        
Average Annual Return, Percent 53.14%     19.40% 25.14%
S&P Transportation Select Industry FMC Capped Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name S&P Transportation Select Industry FMC Capped Index (Spliced)        
Average Annual Return, Percent 35.40%     5.55% 10.66%
Russell 1000 Utilities RIC 22.5/45 Capped Index (Spliced)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Russell 1000 Utilities RIC 22.5/45 Capped Index (Spliced)        
Average Annual Return, Percent 19.41%     10.51% 10.28%
S&P Global Clean Energy Transition Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name S&P Global Clean Energy Transition Index (Net) S&P Global Clean Energy Transition Index (Net)      
Average Annual Return, Percent 78.87%     (0.79%) 10.34%
FTSE EPRA Nareit Developed Green Target Index (Net)          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name FTSE EPRA Nareit Developed Green Target Index (Net)        
Average Annual Return, Percent 15.86%   7.70%    
FTSE EPRA Nareit Global REITs Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name FTSE EPRA Nareit Global REITs Index (Net)        
Average Annual Return, Percent 16.17%     2.55% 3.53%
FTSE EPRA Nareit Developed ex US Index          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name FTSE EPRA Nareit Developed ex US Index (Net)        
Average Annual Return, Percent 15.69%     (0.72%) 1.96%