v3.25.4
Transamerica Large Cap Value Average Annual Total Returns - Retail Class [Member]
 12 Months Ended 55 Months Ended 60 Months Ended 104 Months Ended 106 Months Ended 120 Months Ended 140 Months Ended
Oct. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
 [2]
Dec. 31, 2025
Dec. 31, 2025
 [3]
Dec. 31, 2025
 [4]
Dec. 31, 2025
Dec. 31, 2025
 [5]
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)[Member]                
Prospectus [Line Items]                
Average Annual Return, Percent   17.15% [1] 11.55% 13.15% [1] 14.28% 14.09% 14.29% [1]
Performance Inception Date Apr. 21, 2017 [3]   May 28, 2021     Mar. 10, 2017    
Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)[Member]                
Prospectus [Line Items]                
Average Annual Return, Percent   15.91%   11.33%     10.53%  
A                
Prospectus [Line Items]                
Average Annual Return, Percent   16.71%   13.17%     10.36%  
Performance Inception Date Nov. 15, 2010              
A | After Taxes on Distributions                
Prospectus [Line Items]                
Average Annual Return, Percent   15.67%   11.90%     8.58%  
A | After Taxes on Distributions and Sales                
Prospectus [Line Items]                
Average Annual Return, Percent   10.59%   10.24%     7.80%  
C                
Prospectus [Line Items]                
Average Annual Return, Percent   21.59%   13.59%     10.16%  
Performance Inception Date Nov. 15, 2010              
I                
Prospectus [Line Items]                
Average Annual Return, Percent   23.94%   14.87%     11.36%  
Performance Inception Date Nov. 15, 2010              
I2                
Prospectus [Line Items]                
Average Annual Return, Percent   23.97%   14.87%     11.40%  
Performance Inception Date Nov. 15, 2010              
R6                
Prospectus [Line Items]                
Average Annual Return, Percent   23.88%   14.87%     11.41%  
Performance Inception Date May 29, 2015              
[1] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.
[2] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.
[3] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.
[4] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.
[5] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.