Nomura Corporate Bond Fund Nomura Corporate Bond Fund Nomura Extended Duration Bond Fund Nomura Extended Duration Bond Fund Nomura Floating Rate Fund Nomura Floating Rate Fund Dnovembercorporatebondextendeddurationpro_2220 (Nomura Corporate Bond Fund and Nomura Extended Duration Bond Fund - Classes A, C, R, Institutional, and R6) Dnovemberfloatingratefundpro_2214 (Nomura Floating Rate Fund - Classes A, C, R, Institutional and R6) Dnovemberincomefundssai_2228 November - Income Funds_SAI Class A - C000011001 Class A Class C - C000011003 Class C Class R - C000011004 Class R Class Institutional - C000011005 Institutional Class Class R6 - C000211235 Class R6 Class A - C000011010 Class A Class C - C000011012 Class C Class R - C000011013 Class R Class Institutional - C000011014 Institutional Class Class R6 - C000169262 Class R6 Class A - C000085181 Class A Class C - C000085182 Class C Class R - C000085183 Class R Class Institutional - C000085184 Institutional Class Class R6 - C000228679 Class R6 Portfolio Turnover Risk Portfolio Turnover Risk [Member] Bloomberg US Corporate Bond Index (reflects no deduction for fees, expenses, or taxes) Bloomberg US Corporate Bond Index (reflects no deduction for fees, expenses, or taxes) Market Risk Market Risk [Member] Interest rate risk Interest rate risk [Member] credit risk credit risk [Member] Industry and sector risk Industry and sector risk [Member] High Yield (Junk) Bond Risk High Yield (Junk) Bond Risk [Member] Loans and Other Direct Indebtedness Risk Loans and Other Direct Indebtedness Risk [Member] Foreign Risk Foreign Risk [Member] Liquidity Risk Liquidity Risk [Member] Government and Regulatory Risk Government and Regulatory Risk [Member] Active Managment and Selection Risk Active Managment and Selection Risk [Member] Bloomberg US Aggregate Index (reflects no deduction for fees, expenses, or taxes) Bloomberg US Aggregate Index (reflects no deduction for fees, expenses, or taxes) Bloomberg Long US Corporate Index (reflects no deduction for fees, expenses, or taxes) Bloomberg Long US Corporate Index (reflects no deduction for fees, expenses, or taxes) Adjustable Rate Securities Risk Adjustable Rate Securities Risk [Member] Prepayment Risk Prepayment Risk [Member] Foreign and Emerging Markets Risk Foreign and Emerging Markets Risk [Member] Derivatives Risk Derivatives Risk [Member] Valuation Risk Valuation Risk [Member] Morningstar LSTA US Leveraged Loan Index (reflects no deduction for fees, expenses, or taxes) Morningstar LSTA US Leveraged Loan Index (reflects no deduction for fees, expenses, or taxes)