v3.25.3
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
(Nomura Strategic Income Fund - Classes A, C, R and Institutional) | Nomura Strategic Income Fund | Bloomberg US Aggregate Index (reflects no deduction for fees, expenses, or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 1.25% (0.33%) 1.35%
(Nomura Strategic Income Fund - Classes A, C, R and Institutional) | Nomura Strategic Income Fund | Class A      
Prospectus [Line Items]      
Average Annual Return, Percent 1.76% 1.94% 2.39%
(Nomura Strategic Income Fund - Classes A, C, R and Institutional) | Nomura Strategic Income Fund | Class A | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent (0.67%) 0.06% 0.73%
(Nomura Strategic Income Fund - Classes A, C, R and Institutional) | Nomura Strategic Income Fund | Class A | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 1.00% 0.66% 1.08%
(Nomura Strategic Income Fund - Classes A, C, R and Institutional) | Nomura Strategic Income Fund | Class C      
Prospectus [Line Items]      
Average Annual Return, Percent 4.72% 2.13% 2.09%
(Nomura Strategic Income Fund - Classes A, C, R and Institutional) | Nomura Strategic Income Fund | Class R      
Prospectus [Line Items]      
Average Annual Return, Percent 6.11% 2.62% 2.59%
(Nomura Strategic Income Fund - Classes A, C, R and Institutional) | Nomura Strategic Income Fund | Institutional Class      
Prospectus [Line Items]      
Average Annual Return, Percent 6.64% 3.15% 3.11%
(Nomura Emerging Markets Debt Corporate Fund - Classes A, C and Institutional) | Nomura Emerging Markets Debt Corporate Fund | Bloomberg Global Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent (1.69%) (1.96%) 0.15%
(Nomura Emerging Markets Debt Corporate Fund - Classes A, C and Institutional) | Nomura Emerging Markets Debt Corporate Fund | J.P. Morgan Corporate Emerging Markets Bond Index Broad Diversified (reflects no deduction for fees, expenses, or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 7.63% 2.18% 4.03%
(Nomura Emerging Markets Debt Corporate Fund - Classes A, C and Institutional) | Nomura Emerging Markets Debt Corporate Fund | Class A      
Prospectus [Line Items]      
Average Annual Return, Percent 2.73% 1.17% 3.52%
(Nomura Emerging Markets Debt Corporate Fund - Classes A, C and Institutional) | Nomura Emerging Markets Debt Corporate Fund | Class A | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 0.08% (0.79%) 1.57%
(Nomura Emerging Markets Debt Corporate Fund - Classes A, C and Institutional) | Nomura Emerging Markets Debt Corporate Fund | Class A | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 1.57% 0.04% 1.83%
(Nomura Emerging Markets Debt Corporate Fund - Classes A, C and Institutional) | Nomura Emerging Markets Debt Corporate Fund | Class C      
Prospectus [Line Items]      
Average Annual Return, Percent 5.71% 1.33% 3.38%
(Nomura Emerging Markets Debt Corporate Fund - Classes A, C and Institutional) | Nomura Emerging Markets Debt Corporate Fund | Institutional Class      
Prospectus [Line Items]      
Average Annual Return, Percent 7.89% 2.34% 4.20%