v3.26.3
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Jul. 31, 2026
Jul. 31, 2026
Jul. 31, 2026
C000162463      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class A with Maximum Sales Charge    
Average Annual Return, Percent 13.27% 7.92% 7.35%
C000162464      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class I    
C000117767      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class R6    
Without Sales Load [Member] | C000162463      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.01% 8.64% 7.71%
Without Sales Load [Member] | C000162464      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.31% 8.92% 7.98%
Without Sales Load [Member] | C000117767      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.54% 9.00% 8.06%
EATON VANCE Index: J.P. Morgan Emerging Market Bond Index Global Diversified      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name J.P. Morgan Emerging Market Bond Index Global Diversified    
Average Annual Return, Percent 8.99% 2.27% 2.65%
EATON VANCE Index: J.P. Morgan Emerging Market Bond Index Global Diversified      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name J.P. Morgan Emerging Market Bond Index Global Diversified    
Average Annual Return, Percent 8.99% 2.27% 2.65%
EATON VANCE Index: J.P. Morgan Emerging Market Bond Index Global Diversified      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name J.P. Morgan Emerging Market Bond Index Global Diversified    
Average Annual Return, Percent 8.99% 2.27% 2.65%
EATON VANCE Index: J.P. Morgan EMB (JEMB) Hard Currency/Local Currency 50-50 Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name J.P. Morgan EMB (JEMB) Hard Currency/Local Currency 50-50 Index    
Average Annual Return, Percent 8.05% 2.36% 3.22%
EATON VANCE Index: J.P. Morgan EMB (JEMB) Hard Currency/Local Currency 50-50 Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name J.P. Morgan EMB (JEMB) Hard Currency/Local Currency 50-50 Index    
Average Annual Return, Percent 8.05% 2.36% 3.22%
EATON VANCE Index: J.P. Morgan EMB (JEMB) Hard Currency/Local Currency 50-50 Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name J.P. Morgan EMB (JEMB) Hard Currency/Local Currency 50-50 Index    
Average Annual Return, Percent 8.05% 2.36% 3.22%