v3.25.4
Average Annual Total Returns
 12 Months Ended 60 Months Ended 104 Months Ended 120 Months Ended 264 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 3000® Index (reflects no deduction for fees, expenses, or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent 17.15% 13.15% 14.17% [1] 14.29%  
Russell Midcap® Growth Index (reflects no deduction for fees, expenses, or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent 8.66% 6.65% 12.57% [1] 12.49%  
Lipper Mid-Cap Growth Funds Index          
Prospectus [Line Items]          
Average Annual Return, Percent 3.77% 1.73% 9.41% [1] 9.85%  
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. - Investor Class          
Prospectus [Line Items]          
Average Annual Return, Percent 10.37% 7.17%   12.81%  
Performance Inception Date         Dec. 31, 2003
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. - Investor Class | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent 8.34% 5.47%   11.46%  
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. - Investor Class | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent 7.34% 5.37%   10.41%  
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc. - I Class          
Prospectus [Line Items]          
Average Annual Return, Percent 10.54% 7.36% 12.95%    
Performance Inception Date     May 03, 2017    
[1] Return since 5/3/17.