Nomura Small Cap Core FundNomura Small Cap Core FundNomura Small Cap Value FundNomura Small Cap Value FundNomura Wealth Builder FundNomura Wealth Builder FundDmarchsmallcapcorepro_2514Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6Dmarchsmallcapvaluepro_2516Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6Dmarchwealthbuilderpro_2512Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6Dmarchdgefvsai_2506March - DGEF V_SAIClass A - C000006373AClass C - C000006374CClass R - C000006375RClass Institutional - C000006376InstitutionalClass R6 - C000171461R6Class A - C000006377AClass C - C000006379CClass R - C000006380RClass Institutional - C000006381InstitutionalClass R6 - C000171462R6Class A - C000006368AClass C - C000006370CClass R - C000006371RClass Institutional - C000006372InstitutionalClass R6 - C000240402R6Market Risk [Member]Market Risk [Member]Industry and sector riskIndustry and sector riskCompany size risk [Member]Company size risk [Member]Interest rate risk [Member]Interest rate risk [Member]Liquidity Risk [Member]Liquidity Risk [Member]Government and Regulatory Risk [Member]Government and Regulatory Risk [Member]Active management and selection risk [Member]Active management and selection risk [Member]Russell 3000 Index (reflects no deduction for fees, expenses or taxes)Russell 3000 Index (reflects no deduction for fees, expenses or taxes)Russell 2000 Index (reflects no deduction for fees, expenses, or taxes)Russell 2000 Index (reflects no deduction for fees, expenses, or taxes)Real estate industry risk [Member]Real estate industry risk [Member]Russell 2000 Value Index (reflects no deduction for fees, expenses, or taxes)Russell 2000 Value Index (reflects no deduction for fees, expenses, or taxes)Credit risk [Member]Credit risk [Member]High Yield (Junk) Bond Risk [Member]High Yield (Junk) Bond Risk [Member]Derivatives Risk [Member]Derivatives Risk [Member]Leveraging Risk [Member]Leveraging Risk [Member]Exchange-traded fund risk [Member]Exchange-traded fund risk [Member]Foreign RiskForeign RiskSubsidiary riskSubsidiary riskS&P 500 Index (reflects no deduction for fees, expenses, or taxes)S&P 500 Index (reflects no deduction for fees, expenses, or taxes)Bloomberg US Aggregate Index (reflects no deduction for fees, expenses, or taxes)Bloomberg US Aggregate Index (reflects no deduction for fees, expenses, or taxes)60% S&P 500 Index / 40% Bloomberg US Aggregate Index (reflects no deduction for fees, expenses, or taxes)60% S&P 500 Index / 40% Bloomberg US Aggregate Index (reflects no deduction for fees, expenses, or taxes)