v3.26.3
S000010309 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
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%
Russell 2000® Growth Index (reflects no deduction for fees, expenses, or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 13.01% 3.18% 9.57%
Class A      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 0.39% (1.37%) 10.70%
Class A | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 0.39% (1.82%) 9.20%
Class A | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 0.23% (1.06%) 8.43%
Class C      
Prospectus [Line Items]      
Average Annual Return, Percent 3.06% (1.25%) 10.35%
Advisor Class      
Prospectus [Line Items]      
Average Annual Return, Percent 5.13% (0.26%) 11.46%
Class I      
Prospectus [Line Items]      
Average Annual Return, Percent 5.01% (0.26%) 11.47%
Class Z      
Prospectus [Line Items]      
Average Annual Return, Percent 5.09% (0.17%) 11.57%
[1] After-tax returns: – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; – Are an estimate, which is based on the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and – Are not relevant to investors who hold Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.