v3.26.3
Legacy Class and Institutional Class [Member] Average Annual Total Returns - Legacy Class and Institutional Class
 12 Months Ended 60 Months Ended 120 Months Ended 132 Months Ended 497 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 2500® Growth Index (reflects no deductions for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent [1] 10.31% 2.98% 10.55%    
Performance Inception Date         Aug. 01, 1984
Russell 3000® Index (reflects no deductions for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent [2] 17.15% 13.15% 14.29%    
Performance Inception Date       Dec. 24, 2014  
Legacy Class          
Prospectus [Line Items]          
Average Annual Return, Percent (6.31%) (1.34%) 7.32%    
Performance Inception Date         Aug. 01, 1984
Legacy Class | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent (8.13%) (3.17%) 5.44%    
Performance Inception Date         Aug. 01, 1984
Legacy Class | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent [3] (2.40%) (1.18%) 5.58%    
Performance Inception Date         Aug. 01, 1984
Institutional Class          
Prospectus [Line Items]          
Average Annual Return, Percent (6.25%) (1.30%) 7.35%    
Performance Inception Date       Dec. 24, 2014  
[1] Additional index.
[2] Broad-based securities market index.
[3] The Fund’s returns after taxes on distributions and sale of Fund shares may be higher than its returns after taxes on distributions because it includes the effect of a tax benefit an investor may receive resulting from the capital losses that would have been incurred on the sale of the shares.