v3.26.1
GMO U.S. Opportunistic Value Fund Average Annual Total Returns
 12 Months Ended 16 Months Ended 23 Months Ended 25 Months Ended 60 Months Ended 120 Months Ended
Feb. 28, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Class III              
Prospectus [Line Items]              
Average Annual Return, Percent   12.94%   10.40%  
Performance Inception Date Feb. 15, 2023            
Class III | MSCI USA Value Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   14.34%   10.70%      
Class III | MSCI USA Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   25.08%   22.48%      
Class IV              
Prospectus [Line Items]              
Average Annual Return, Percent   13.01%   10.46%  
Performance Inception Date Feb. 15, 2023            
Class IV | MSCI USA Value Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   14.34%   10.70%      
Class IV | MSCI USA Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   25.08%   22.48%      
Class VI              
Prospectus [Line Items]              
Average Annual Return, Percent   13.09%     12.48%
Performance Inception Date Dec. 13, 2022            
Class VI | After Taxes on Distributions              
Prospectus [Line Items]              
Average Annual Return, Percent   9.24%     9.61%
Class VI | After Taxes on Distributions and Sales              
Prospectus [Line Items]              
Average Annual Return, Percent   9.10%     8.87%
Class VI | MSCI USA Value Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   14.34%     10.13%    
Class VI | MSCI USA Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   25.08%     22.58%    
Class R6              
Prospectus [Line Items]              
Average Annual Return, Percent   12.97% 16.63%    
Performance Inception Date Aug. 28, 2023            
Class R6 | MSCI USA Value Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   14.34% 15.97%        
Class R6 | MSCI USA Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   25.08% 25.65%        
Class I              
Prospectus [Line Items]              
Average Annual Return, Percent   12.85%   10.31%  
Performance Inception Date Feb. 15, 2023            
Class I | MSCI USA Value Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   14.34%   10.70%      
Class I | MSCI USA Index (returns reflect no deduction for fees, expenses, or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   25.08%   22.48%      
[1] MSCI data may not be reproduced or used for any other purpose. MSCI provides no warranties, has not prepared or approved this report, and has no liability hereunder.