v3.26.1
Shareholder Report, Holdings (Details)
Apr. 30, 2026
C000015900 [Member] | North America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000015900 [Member] | South America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000015900 [Member] | Asia [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
C000015900 [Member] | Africa [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000015900 [Member] | Europe [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000015900 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000015902 [Member] | North America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000015902 [Member] | South America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000015902 [Member] | Asia [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
C000015902 [Member] | Africa [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000015902 [Member] | Europe [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000015902 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000096106 [Member] | North America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000096106 [Member] | South America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000096106 [Member] | Asia [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
C000096106 [Member] | Africa [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000096106 [Member] | Europe [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000096106 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000015901 [Member] | North America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000015901 [Member] | South America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000015901 [Member] | Asia [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
C000015901 [Member] | Africa [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000015901 [Member] | Europe [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000015901 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000035633 [Member] | North America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000035633 [Member] | South America [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000035633 [Member] | Asia [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
C000035633 [Member] | Africa [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000035633 [Member] | Europe [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000035633 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%