v3.26.3
Voya MI Dynamic Small Cap Fund Average Annual Total Returns
 12 Months Ended 33 Months Ended 60 Months Ended 120 Months Ended
May 31, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 3000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [1]   17.15% 22.83%    
Class A C I R R6 and W Shares [Member] | Class A          
Prospectus [Line Items]          
Average Annual Return, Percent   1.99%   4.70% 7.30%
Performance Inception Date Apr. 15, 1994        
Class A C I R R6 and W Shares [Member] | Class A | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   (3.62%)   0.19% 3.82%
Class A C I R R6 and W Shares [Member] | Class A | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   1.75%   1.81% 4.46%
Class A C I R R6 and W Shares [Member] | Class A | Russell 3000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   17.15%   13.15% 14.29%
Class A C I R R6 and W Shares [Member] | Class A | Russell 2000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   12.81%   6.09% 9.62%
Class A C I R R6 and W Shares [Member] | Class C          
Prospectus [Line Items]          
Average Annual Return, Percent   6.64%   5.19% 7.28%
Performance Inception Date Jun. 30, 1998        
Class A C I R R6 and W Shares [Member] | Class C | Russell 3000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   17.15%   13.15% 14.29%
Class A C I R R6 and W Shares [Member] | Class C | Russell 2000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   12.81%   6.09% 9.62%
Class A C I R R6 and W Shares [Member] | Class I          
Prospectus [Line Items]          
Average Annual Return, Percent   8.52%   6.28% 8.26%
Performance Inception Date Jan. 04, 1994        
Class A C I R R6 and W Shares [Member] | Class I | Russell 3000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   17.15%   13.15% 14.29%
Class A C I R R6 and W Shares [Member] | Class I | Russell 2000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   12.81%   6.09% 9.62%
Class A C I R R6 and W Shares [Member] | Class R          
Prospectus [Line Items]          
Average Annual Return, Percent   7.91%   5.69% 7.87%
Performance Inception Date Oct. 04, 2016        
Class A C I R R6 and W Shares [Member] | Class R | Russell 3000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   17.15%   13.15% 14.29%
Class A C I R R6 and W Shares [Member] | Class R | Russell 2000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   12.81%   6.09% 9.62%
Class A C I R R6 and W Shares [Member] | Class R6          
Prospectus [Line Items]          
Average Annual Return, Percent   8.57%   6.32% 8.33%
Performance Inception Date May 31, 2013        
Class A C I R R6 and W Shares [Member] | Class R6 | Russell 3000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   17.15%   13.15% 14.29%
Class A C I R R6 and W Shares [Member] | Class R6 | Russell 2000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   12.81%   6.09% 9.62%
Class A C I R R6 and W Shares [Member] | Class W          
Prospectus [Line Items]          
Average Annual Return, Percent   8.46%   6.21% 8.20%
Performance Inception Date Jun. 12, 2009        
Class A C I R R6 and W Shares [Member] | Class W | Russell 3000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   17.15%   13.15% 14.29%
Class A C I R R6 and W Shares [Member] | Class W | Russell 2000® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   12.81%   6.09% 9.62%
[1] The index returns do not reflect deductions for fees, expenses, or taxes.
[2] The index returns do not reflect deductions for fees, expenses, or taxes.