v3.26.3
Voya MI Dynamic SMID 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 and W Shares [Member] | Class A          
Prospectus [Line Items]          
Average Annual Return, Percent   0.76%   8.03% 8.69%
Performance Inception Date Feb. 03, 1998        
Class A C I R and W Shares [Member] | Class A | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   (5.56%)   4.90% 6.49%
Class A C I R and W Shares [Member] | Class A | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   3.94%   5.84% 6.58%
Class A C I R 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 and W Shares [Member] | Class A | Russell 2500TM Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   11.91%   7.26% 10.40%
Class A C I R and W Shares [Member] | Class A | S&P MidCap 400® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   7.50%   9.12% 10.72%
Class A C I R and W Shares [Member] | Class C          
Prospectus [Line Items]          
Average Annual Return, Percent   5.61%   8.76% 8.91%
Performance Inception Date Jun. 30, 1998        
Class A C I R 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 and W Shares [Member] | Class C | Russell 2500TM Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   11.91%   7.26% 10.40%
Class A C I R and W Shares [Member] | Class C | S&P MidCap 400® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   7.50%   9.12% 10.72%
Class A C I R and W Shares [Member] | Class I          
Prospectus [Line Items]          
Average Annual Return, Percent   7.15%   9.56% 9.60%
Performance Inception Date Feb. 03, 1998        
Class A C I R 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 and W Shares [Member] | Class I | Russell 2500TM Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   11.91%   7.26% 10.40%
Class A C I R and W Shares [Member] | Class I | S&P MidCap 400® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   7.50%   9.12% 10.72%
Class A C I R and W Shares [Member] | Class R          
Prospectus [Line Items]          
Average Annual Return, Percent   6.64%   9.03% 9.07%
Performance Inception Date Oct. 24, 2003        
Class A C I R 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 and W Shares [Member] | Class R | Russell 2500TM Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   11.91%   7.26% 10.40%
Class A C I R and W Shares [Member] | Class R | S&P MidCap 400® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   7.50%   9.12% 10.72%
Class A C I R and W Shares [Member] | Class R6          
Prospectus [Line Items]          
Average Annual Return, Percent   7.10%   9.58% 9.58%
Performance Inception Date Aug. 05, 2011        
Class A C I R 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 and W Shares [Member] | Class R6 | Russell 2500TM Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   11.91%   7.26% 10.40%
Class A C I R and W Shares [Member] | Class R6 | S&P MidCap 400® Index[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   7.50%   9.12% 10.72%
[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.