v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Nov. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Core Fund | Russell 3000 Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent [1]   17.15% 13.15% 14.29%
Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Core Fund | Russell 2000 Index (reflects no deduction for fees, expenses, or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent [1]   12.81% 6.09% 9.62%
Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Core Fund | A        
Prospectus [Line Items]        
Average Annual Return, Percent   (1.68%) 4.86% 8.35%
Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Core Fund | A | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent   (2.65%) 3.92% 7.32%
Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Core Fund | A | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent   (0.29%) 3.67% 6.56%
Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Core Fund | C        
Prospectus [Line Items]        
Average Annual Return, Percent   2.56% 5.32% 8.18%
Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Core Fund | R        
Prospectus [Line Items]        
Average Annual Return, Percent   4.07% 5.84% 8.72%
Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Core Fund | Institutional        
Prospectus [Line Items]        
Average Annual Return, Percent   4.59% 6.37% 9.27%
Nomura Small Cap Core Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Core Fund | R6        
Prospectus [Line Items]        
Average Annual Return, Percent   4.73% 6.50% 9.69%
Performance Inception Date May 02, 2016      
Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Value Fund | Russell 3000 Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent [2]   17.15% 13.15% 14.29%
Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Value Fund | Russell 2000 Value Index (reflects no deduction for fees, expenses, or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent   12.59% 8.88% 9.27%
Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Value Fund | A        
Prospectus [Line Items]        
Average Annual Return, Percent   1.49% 7.58% 8.15%
Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Value Fund | A | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent   (1.37%) 5.62% 6.77%
Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Value Fund | A | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent   3.01% 5.85% 6.46%
Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Value Fund | C        
Prospectus [Line Items]        
Average Annual Return, Percent   5.98% 8.06% 7.99%
Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Value Fund | R        
Prospectus [Line Items]        
Average Annual Return, Percent   7.41% 8.60% 8.53%
Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Value Fund | Institutional        
Prospectus [Line Items]        
Average Annual Return, Percent   7.95% 9.14% 9.07%
Nomura Small Cap Value Fund - Class A, C, R, Institutional and R6 | Nomura Small Cap Value Fund | R6        
Prospectus [Line Items]        
Average Annual Return, Percent   8.10% 9.31% 8.86%
Performance Inception Date May 02, 2016      
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent   17.88% 14.42% 14.82%
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | Bloomberg US Aggregate Index (reflects no deduction for fees, expenses, or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent   7.30% (0.36%) 2.01%
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | 60% S&P 500 Index / 40% Bloomberg US Aggregate Index (reflects no deduction for fees, expenses, or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent   13.70% 8.47% 9.78%
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | A        
Prospectus [Line Items]        
Average Annual Return, Percent   6.53% 7.25% 6.57%
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | A | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent   4.33% 5.43% 5.09%
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | A | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent   4.52% 5.21% 4.81%
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | C        
Prospectus [Line Items]        
Average Annual Return, Percent   11.20% 7.71% 6.39%
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | R        
Prospectus [Line Items]        
Average Annual Return, Percent   12.73% 8.25% 6.93%
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | Institutional        
Prospectus [Line Items]        
Average Annual Return, Percent   13.33% 8.81% 7.47%
Nomura Wealth Builder Fund - Class A, C, R, Institutional and R6 | Nomura Wealth Builder Fund | R6        
Prospectus [Line Items]        
Average Annual Return, Percent   13.35%   12.25%
Performance Inception Date Feb. 28, 2023      
[1]
  Frank Russell Company is the source and owner of the trademarks, service marks, and copyrights related to the Russell Indexes. Russell® is a trademark of Frank Russell Company.
[2]
  Frank Russell Company is the source and owner of the trademarks, service marks, and copyrights related to the Russell Indexes. Russell® is a trademark of Frank Russell Company.