v3.26.1
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Apr. 30, 2026
Apr. 30, 2026
Apr. 30, 2026
Without Sales Load [Member] | C000012098      
Average Annual Return [Line Items]      
Average Annual Return, Percent 33.36% 12.82% 17.53%
Without Sales Load [Member] | C000012101      
Average Annual Return [Line Items]      
Average Annual Return, Percent 25.73% 8.19% 11.15%
Without Sales Load [Member] | C000012193      
Average Annual Return [Line Items]      
Average Annual Return, Percent 23.35% 6.60% 13.79%
Without Sales Load [Member] | C000012197      
Average Annual Return [Line Items]      
Average Annual Return, Percent 36.22% 4.07% 11.49%
Without Sales Load [Member] | C000012198      
Average Annual Return [Line Items]      
Average Annual Return, Percent 34.10% 7.25% 8.62%
Without Sales Load [Member] | C000012079      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.13% 4.26% 6.01%
Morningstar US Market Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 30.96% 12.08% 14.86%
Morningstar US Market Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 30.96% 12.08% 14.86%
Morningstar US Market Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 30.96% 12.08% 14.86%
Morningstar US Market Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 30.96% 12.08% 14.86%
Morningstar US Market Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 30.96% 12.08% 14.86%
S&P Total Market Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 31.37% 11.86% 14.71%
Morningstar US Large-Mid Cap Broad Growth Index (Spliced)      
Average Annual Return [Line Items]      
Average Annual Return, Percent 33.41% 12.86% 17.78%
Morningstar US Mid Cap Index (Spliced)      
Average Annual Return [Line Items]      
Average Annual Return, Percent 25.71% 8.20% 11.30%
Morningstar US Mid Cap Broad Growth Index (Spliced)      
Average Annual Return [Line Items]      
Average Annual Return, Percent 23.36% 6.64% 13.96%
Morningstar US Small Cap Broad Growth Extended Index (Spliced)      
Average Annual Return [Line Items]      
Average Annual Return, Percent 36.24% 4.01% 11.54%
Morningstar US Small Cap Broad Value Extended Index (Spliced)      
Average Annual Return [Line Items]      
Average Annual Return, Percent 34.07% 7.25% 8.78%
Cohen & Steers Realty Majors Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 14.51% 4.62% 6.39%