v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 107 Months Ended 120 Months Ended
Jan. 31, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric Emerging Markets Fund | MSCI Emerging Markets Index (reflects net dividends, which reflect the deduction of withholding taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent   33.57% 4.19%   8.41%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric Emerging Markets Fund | Class A          
Prospectus [Line Items]          
Average Annual Return, Percent   20.44% 5.13%   6.11%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric Emerging Markets Fund | Class A | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   19.68% 4.63%   5.74%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric Emerging Markets Fund | Class A | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   12.69% 4.08%   5.03%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric Emerging Markets Fund | Class C          
Prospectus [Line Items]          
Average Annual Return, Percent   25.27% 5.50%   6.06%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric Emerging Markets Fund | Class I          
Prospectus [Line Items]          
Average Annual Return, Percent   27.49% 6.54%   6.95%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric Emerging Markets Fund | Class R6          
Prospectus [Line Items]          
Average Annual Return, Percent   27.51% 6.62%   7.02%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric International Equity Fund | MSCI EAFE Index (reflects net dividends, which reflect the deduction of withholding taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent   31.22% 8.92%   8.18%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric International Equity Fund | Class A          
Prospectus [Line Items]          
Average Annual Return, Percent   21.74% 5.41%   6.87%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric International Equity Fund | Class A | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   18.04% 4.10%   6.03%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric International Equity Fund | Class A | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   14.97% 4.13%   5.53%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric International Equity Fund | Class I          
Prospectus [Line Items]          
Average Annual Return, Percent   28.77% 6.81%   7.72%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric International Equity Fund | Class R          
Prospectus [Line Items]          
Average Annual Return, Percent   28.15% 6.26%   7.18%
Parametric International Funds Classess - A,C,I,R, & R6 | Parametric International Equity Fund | Class R6          
Prospectus [Line Items]          
Average Annual Return, Percent   28.77% 6.82%   7.74%
Parametric Volatility Risk Premium - Defensive Fund | Parametric Volatility Risk Premium - Defensive Fund | S&P 500 Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent   17.88% 14.42% 14.91%  
Parametric Volatility Risk Premium - Defensive Fund | Parametric Volatility Risk Premium - Defensive Fund | Cboe S&P 500 BuyWrite Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent   8.91% 9.33% 7.07%  
Parametric Volatility Risk Premium - Defensive Fund | Parametric Volatility Risk Premium - Defensive Fund | ICE BofAML 3-Month U.S. Treasury Bill Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent   4.18% 3.17% 2.41%  
Parametric Volatility Risk Premium - Defensive Fund | Parametric Volatility Risk Premium - Defensive Fund | Blended Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent [1]   10.99% 8.96% 8.83%  
Parametric Volatility Risk Premium - Defensive Fund | Parametric Volatility Risk Premium - Defensive Fund | Class I          
Prospectus [Line Items]          
Average Annual Return, Percent   12.88% 10.60% 8.89%  
Performance Inception Date Feb. 09, 2017        
Parametric Volatility Risk Premium - Defensive Fund | Parametric Volatility Risk Premium - Defensive Fund | Class I | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   11.51% 9.39% 8.10%  
Parametric Volatility Risk Premium - Defensive Fund | Parametric Volatility Risk Premium - Defensive Fund | Class I | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   8.03% 8.08% 6.99%  
[1]
* The Blended Index consists of 50% S&P 500® Index and 50% ICE BofAML 3-Month U.S. Treasury Bill Index, rebalanced monthly.