Nomura Limited-Term Diversified Income FundNomura Limited-Term Diversified Income FundNomura Tax-Free Oregon FundNomura Tax-Free Oregon FundDaprillimitedtermdiversifiedpro_2664April - Limited Term Diversified_ProDapriltaxfreeoregonpro_2662April - Tax Free Oregon_ProDaprillimitedtermdiversifiedsai_2666April - Limited Term Diversified_SAIDapriltaxfreeoregonsai_2667April - Tax Free Oregon_SAIClass A - C000006359AClass C - C000006361CClass R - C000006362RClass Institutional - C000006363InstitutionalClass R6 - C000190626R6Class A - C000212989AClass Institutional - C000212988InstitutionalMarket Risk [Member]Market Risk [Member]Interest rate risk [Member]Interest rate risk [Member]Credit risk [Member]Credit risk [Member]High Yield (Junk) Bond Risk [Member]High Yield (Junk) Bond Risk [Member]Prepayment Risk [Member]Prepayment Risk [Member]Liquidity Risk [Member]Liquidity Risk [Member]Derivatives Risk [Member]Derivatives Risk [Member]Mortgage-Backed and Asset-Backed Securities Risk [Member]Mortgage-Backed and Asset-Backed Securities Risk [Member]Leveraging Risk [Member]Leveraging Risk [Member]Foreign RiskForeign RiskValuation Risk [Member]Valuation Risk [Member]Government and Regulatory Risk [Member]Government and Regulatory Risk [Member]Portfolio Turnover Risk [Member]Portfolio Turnover Risk [Member]Active management and selection risk [Member]Active management 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 1-3 Year US Government/Credit Index (reflects no deduction for fees, expenses, or taxes)Bloomberg 1-3 Year US Government/Credit Index (reflects no deduction for fees, expenses, or taxes)Call Risk [Member]Call Risk [Member]Geographic concentration risk [Member]Geographic concentration risk [Member]Alternative minimum tax risk [Member]Alternative minimum tax risk [Member]Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)