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
C000007412      
Average Annual Return [Line Items]      
Average Annual Return, Percent 24.18% 7.94% 11.78%
C000007414      
Average Annual Return [Line Items]      
Average Annual Return, Percent 29.07% 8.27% 11.67%
Without Sales Load [Member] | C000250247      
Average Annual Return [Line Items]      
Average Annual Return, Percent 31.53% 9.44% 12.70%
Without Sales Load [Member] | C000047292      
Average Annual Return [Line Items]      
Average Annual Return, Percent 30.73% 8.80% 12.02%
Without Sales Load [Member] | C000007415      
Average Annual Return [Line Items]      
Average Annual Return, Percent 31.40% 9.40% 12.68%
Without Sales Load [Member] | C000007412      
Average Annual Return [Line Items]      
Average Annual Return, Percent 31.06% 9.11% 12.39%
Without Sales Load [Member] | C000007414      
Average Annual Return [Line Items]      
Average Annual Return, Percent 30.07% 8.27% 11.67%
MSCI World Index (Net)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name MSCI World Index (Net)    
Average Annual Return, Percent 29.16% 11.29% 12.65%
MSCI World Index (Net)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name MSCI World Index (Net)    
Average Annual Return, Percent 29.16% 11.29% 12.65%
MSCI World Index (Net)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name MSCI World Index (Net)    
Average Annual Return, Percent 29.16% 11.29% 12.65%
MSCI World Index (Net)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name MSCI World Index (Net)    
Average Annual Return, Percent 29.16% 11.29% 12.65%
MSCI World Index (Net)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name MSCI World Index (Net)    
Average Annual Return, Percent 29.16% 11.29% 12.65%