v3.25.4
S000005556 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 90 Months Ended 120 Months Ended 323 Months Ended 383 Months Ended 456 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
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%      
Russell Midcap® Value Index (reflects no deduction for fees, expenses or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent [2] 11.05% 9.83%   9.78%      
Lipper Mid-Cap Value Funds Classification Average (reflects no deduction for taxes or sales loads)              
Prospectus [Line Items]              
Average Annual Return, Percent [3] 9.04% 10.52%   9.24%      
Class A              
Prospectus [Line Items]              
Average Annual Return, Percent 3.39% 9.72%   9.37%    
Performance Inception Date             Dec. 22, 1987
Class A | After Taxes on Distributions              
Prospectus [Line Items]              
Average Annual Return, Percent 0.03% 8.01%   8.07%    
Performance Inception Date             Dec. 22, 1987
Class A | After Taxes on Distributions and Sales              
Prospectus [Line Items]              
Average Annual Return, Percent 4.08% 7.52%   7.43%    
Performance Inception Date             Dec. 22, 1987
Class C              
Prospectus [Line Items]              
Average Annual Return, Percent 8.86% 10.20%   9.36%    
Performance Inception Date         Feb. 01, 1999    
Class I              
Prospectus [Line Items]              
Average Annual Return, Percent 9.96% 11.31%   10.29%    
Performance Inception Date           Feb. 04, 1994  
Class R6              
Prospectus [Line Items]              
Average Annual Return, Percent 10.10% 11.46% 8.56%      
Performance Inception Date     Jun. 20, 2018        
Class R6 | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent [1]     13.78%        
Class R6 | Russell Midcap® Value Index (reflects no deduction for fees, expenses or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent [2]     8.50%        
Class R6 | Lipper Mid-Cap Value Funds Classification Average (reflects no deduction for taxes or sales loads)              
Prospectus [Line Items]              
Average Annual Return, Percent [3]     7.99%        
[1]
An index designed to measure the performance of the stocks of the 3,000 largest publicly traded U.S. companies, based on market capitalization. The index measures the performance of about 98% of the total market capitalization of the publicly traded U.S. equity market.
[2]
An index designed to measure the performance of the mid-cap value segment of the U.S. equity universe, and includes those Russell Midcap® Index companies with lower price-to-book ratios and lower forecasted growth values.
[3]
Represents the average annualized total return for all reporting funds in the Lipper Mid-Cap Value Funds Classification.