Shareholder Report, Holdings (Details)	Apr. 30, 2026
C000014875 \| NR
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014875 \| Country Other Line
Holdings [Line Items]
Percent of Net Asset Value	40.00%
C000014875 \| AA
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014875 \| A
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000014875 \| BBB
Holdings [Line Items]
Percent of Net Asset Value	36.00%
C000014875 \| BB
Holdings [Line Items]
Percent of Net Asset Value	30.00%
C000014875 \| B
Holdings [Line Items]
Percent of Net Asset Value	19.00%
C000014875 \| CCC
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000014875 \| Mexico
Holdings [Line Items]
Percent of Net Asset Value	11.00%
C000014875 \| Angola
Holdings [Line Items]
Percent of Net Asset Value	8.00%
C000014875 \| Nigeria
Holdings [Line Items]
Percent of Net Asset Value	7.00%
C000014875 \| Brazil
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000014875 \| Turkey
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000014875 \| Chile
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000014875 \| Dominican Republic
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014875 \| South Africa
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014875 \| Hungary
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014875 \| Uzbekistan
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014875 \| Sovereign
Holdings [Line Items]
Percent of Net Asset Value	65.00%
C000014875 \| Government Agency
Holdings [Line Items]
Percent of Net Asset Value	22.00%
C000014875 \| Supranational
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000014875 \| Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000014875 \| Treasuries
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000014875 \| Corporates
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000014875 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000014879 \| NR
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014879 \| Country Other Line
Holdings [Line Items]
Percent of Net Asset Value	40.00%
C000014879 \| AA
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014879 \| A
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000014879 \| BBB
Holdings [Line Items]
Percent of Net Asset Value	36.00%
C000014879 \| BB
Holdings [Line Items]
Percent of Net Asset Value	30.00%
C000014879 \| B
Holdings [Line Items]
Percent of Net Asset Value	19.00%
C000014879 \| CCC
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000014879 \| Mexico
Holdings [Line Items]
Percent of Net Asset Value	11.00%
C000014879 \| Angola
Holdings [Line Items]
Percent of Net Asset Value	8.00%
C000014879 \| Nigeria
Holdings [Line Items]
Percent of Net Asset Value	7.00%
C000014879 \| Brazil
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000014879 \| Turkey
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000014879 \| Chile
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000014879 \| Dominican Republic
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014879 \| South Africa
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014879 \| Hungary
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014879 \| Uzbekistan
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000014879 \| Sovereign
Holdings [Line Items]
Percent of Net Asset Value	65.00%
C000014879 \| Government Agency
Holdings [Line Items]
Percent of Net Asset Value	22.00%
C000014879 \| Supranational
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000014879 \| Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000014879 \| Treasuries
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000014879 \| Corporates
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000014879 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000063958 \| NR
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000063958 \| Country Other Line
Holdings [Line Items]
Percent of Net Asset Value	40.00%
C000063958 \| AA
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000063958 \| A
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000063958 \| BBB
Holdings [Line Items]
Percent of Net Asset Value	36.00%
C000063958 \| BB
Holdings [Line Items]
Percent of Net Asset Value	30.00%
C000063958 \| B
Holdings [Line Items]
Percent of Net Asset Value	19.00%
C000063958 \| CCC
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000063958 \| Mexico
Holdings [Line Items]
Percent of Net Asset Value	11.00%
C000063958 \| Angola
Holdings [Line Items]
Percent of Net Asset Value	8.00%
C000063958 \| Nigeria
Holdings [Line Items]
Percent of Net Asset Value	7.00%
C000063958 \| Brazil
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000063958 \| Turkey
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000063958 \| Chile
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000063958 \| Dominican Republic
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000063958 \| South Africa
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000063958 \| Hungary
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000063958 \| Uzbekistan
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000063958 \| Sovereign
Holdings [Line Items]
Percent of Net Asset Value	65.00%
C000063958 \| Government Agency
Holdings [Line Items]
Percent of Net Asset Value	22.00%
C000063958 \| Supranational
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000063958 \| Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000063958 \| Treasuries
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000063958 \| Corporates
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000063958 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	2.00%

Shareholder Report, Holdings (Details)

Apr. 30, 2026