v3.26.1
Shareholder Report, Average Annual Return (Details)
 6 Months Ended 12 Months Ended 21 Months Ended 60 Months Ended 64 Months Ended 114 Months Ended 120 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
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Jun. 30, 2026
Jun. 30, 2026
Diamond Hill Small Cap Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 27.99%   44.64%     13.06%     10.91%  
Diamond Hill Small Cap Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 28.19%   45.06%     13.38%     11.23%  
Diamond Hill Small Cap Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 28.28%   45.26%     13.53%     11.36%  
Diamond Hill Small-Mid Cap Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 6.66%   14.46%     5.22%     7.82%  
Diamond Hill Small-Mid Cap Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 6.83%   14.79%     5.52%     8.14%  
Diamond Hill Small-Mid Cap Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 6.91%   14.94%     5.66%     8.27%  
Diamond Hill Mid Cap Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 4.94%   13.19%     6.12%     8.19%  
Diamond Hill Mid Cap Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 5.14%   13.54%     6.43%     8.52%  
Diamond Hill Mid Cap Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 5.18%   13.66%     6.57%     8.64%  
Diamond Hill Large Cap Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 0.72%   1.91%     4.80%     9.69%  
Diamond Hill Large Cap Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 0.84%   2.17%     5.10%     10.01%  
Diamond Hill Large Cap Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 0.93%   2.30%     5.23%     10.13%  
Diamond Hill Select Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 4.36%   14.18%     9.27%     13.37%  
Diamond Hill Select Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 4.52%   14.54%     9.59%     13.70%  
Diamond Hill Select Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 4.45%   14.49%     9.69%     13.82%  
Diamond Hill Long-Short Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent (7.16%)   1.46%     5.46%     7.03%  
Diamond Hill Long-Short Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent (7.04%)   1.72%     5.77%     7.34%  
Diamond Hill Long-Short Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent (6.99%)   1.84%     5.88%     7.46%  
Diamond Hill International Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 11.36%   22.93%     7.99%   10.42%    
Diamond Hill International Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 11.52%   23.28%     8.32%   10.75%    
Diamond Hill International Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 11.59%   23.42%     8.44%   10.88%    
Diamond Hill Short Duration Securitized Bond Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 1.99%   4.58%     4.38%       3.95%
Diamond Hill Short Duration Securitized Bond Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 2.04%   4.76%     4.67%       4.24%
Diamond Hill Short Duration Securitized Bond Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 2.20%   4.99%     4.83%       4.37%
Diamond Hill Securitized Total Return Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 0.76%   5.66% 5.66%            
Diamond Hill Securitized Total Return Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 0.94%   6.02% 6.02%            
Diamond Hill Securitized Total Return Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 1.00%   6.13% 6.13%            
Diamond Hill Core Bond Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 0.88%   3.69%     0.76%       2.03%
Diamond Hill Core Bond Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 1.06%   3.97%     1.03%       2.32%
Diamond Hill Core Bond Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 1.13%   4.10%     1.17%       2.44%
Diamond Hill Core Plus Bond Fund | Investor Class                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Investor                
Average Annual Return, Percent 1.18%   4.61%   4.77%          
Diamond Hill Core Plus Bond Fund | Class I                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class I                
Average Annual Return, Percent 1.25%   4.86%   5.01%          
Diamond Hill Core Plus Bond Fund | Class Y                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Class Y                
Average Annual Return, Percent 1.32%   4.99%   5.18%          
Diamond Hill Large Cap Concentrated ETF Shares                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Diamond Hill Large Cap Concentrated ETF                
Average Annual Return, Percent (1.67%)   (0.81%)     6.69% 8.15%      
Diamond Hill Small Cap Fund | Investor Class | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Small Cap Fund | Class I | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Small Cap Fund | Class Y | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Small-Mid Cap Fund | Investor Class | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Small-Mid Cap Fund | Class I | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Small-Mid Cap Fund | Class Y | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Mid Cap Fund | Investor Class | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Mid Cap Fund | Class I | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Mid Cap Fund | Class Y | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Large Cap Fund | Investor Class | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Large Cap Fund | Class I | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Large Cap Fund | Class Y | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Select Fund | Investor Class | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Select Fund | Class I Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Select Fund | Class Y | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Long-Short Fund | Investor Class | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Long-Short Fund | Class I | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill Long-Short Fund | Class Y | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31%     15.06%  
Diamond Hill International Fund | Investor Class | MSCI ACWI ex USA Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   MSCI ACWI ex USA Index                
Average Annual Return, Percent 13.68%   27.66%     8.79%   9.85%    
Diamond Hill International Fund | Class I | MSCI ACWI ex USA Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   MSCI ACWI ex USA Index                
Average Annual Return, Percent 13.68%   27.66%     8.79%   9.85%    
Diamond Hill International Fund | Class Y | MSCI ACWI ex USA Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   MSCI ACWI ex USA Index                
Average Annual Return, Percent 13.68%   27.66%     8.79%   9.85%    
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79%     0.08%       1.48%
Diamond Hill Short Duration Securitized Bond Fund | Class I | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79%     0.08%       1.48%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79%     0.08%       1.48%
Diamond Hill Securitized Total Return Fund | Investor Class | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79% 3.79%            
Diamond Hill Securitized Total Return Fund | Class I | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79% 3.79%            
Diamond Hill Securitized Total Return Fund | Class Y | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79% 3.79%            
Diamond Hill Core Bond Fund | Investor Class | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79%     0.08%       1.48%
Diamond Hill Core Bond Fund | Class I | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79%     0.08%       1.48%
Diamond Hill Core Bond Fund | Class Y | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79%     0.08%       1.48%
Diamond Hill Core Plus Bond Fund | Investor Class | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79%   3.40%          
Diamond Hill Core Plus Bond Fund | Class I | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79%   3.40%          
Diamond Hill Core Plus Bond Fund | Class Y | Bloomberg US Aggregate Bond Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Aggregate Bond Index                
Average Annual Return, Percent 0.62%   3.79%   3.40%          
Diamond Hill Large Cap Concentrated ETF Shares | Russell 3000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 3000 Index                
Average Annual Return, Percent 10.88%   22.82%     12.31% 13.89%      
Diamond Hill Small Cap Fund | Investor Class | Russell 2000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 2000 Index                
Average Annual Return, Percent 22.57%   40.78%     6.98%     11.62%  
Diamond Hill Small Cap Fund | Class I | Russell 2000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 2000 Index                
Average Annual Return, Percent 22.57%   40.78%     6.98%     11.62%  
Diamond Hill Small Cap Fund | Class Y | Russell 2000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 2000 Index                
Average Annual Return, Percent 22.57%   40.78%     6.98%     11.62%  
Diamond Hill Small-Mid Cap Fund | Investor Class | Russell 2500 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 2500 Index                
Average Annual Return, Percent 22.71%   36.72%     8.30%     12.25%  
Diamond Hill Small-Mid Cap Fund | Class I | Russell 2500 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 2500 Index                
Average Annual Return, Percent 22.71%   36.72%     8.30%     12.25%  
Diamond Hill Small-Mid Cap Fund | Class Y | Russell 2500 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 2500 Index                
Average Annual Return, Percent 22.71%   36.72%     8.30%     12.25%  
Diamond Hill Mid Cap Fund | Investor Class | Russell Midcap Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell Midcap Index                
Average Annual Return, Percent 15.30%   21.63%     8.50%     12.00%  
Diamond Hill Mid Cap Fund | Class I | Russell Midcap Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell Midcap Index                
Average Annual Return, Percent 15.30%   21.63%     8.50%     12.00%  
Diamond Hill Mid Cap Fund | Class Y | Russell Midcap Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell Midcap Index                
Average Annual Return, Percent 15.30%   21.63%     8.50%     12.00%  
Diamond Hill Large Cap Fund | Investor Class | Russell 1000 Value Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Value Index                
Average Annual Return, Percent 16.26%   27.12%     11.17%     11.52%  
Diamond Hill Large Cap Fund | Investor Class | Russell 1000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Index                
Average Annual Return, Percent 10.33%   22.02%     12.66%     15.30%  
Diamond Hill Large Cap Fund | Class I | Russell 1000 Value Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Value Index                
Average Annual Return, Percent 16.26%   27.12%     11.17%     11.52%  
Diamond Hill Large Cap Fund | Class I | Russell 1000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Index                
Average Annual Return, Percent 10.33%   22.02%     12.66%     15.30%  
Diamond Hill Large Cap Fund | Class Y | Russell 1000 Value Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Value Index                
Average Annual Return, Percent 16.26%   27.12%     11.17%     11.52%  
Diamond Hill Large Cap Fund | Class Y | Russell 1000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Index                
Average Annual Return, Percent 10.33%   22.02%     12.66%     15.30%  
Diamond Hill Long-Short Fund | Investor Class | Russell 1000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Index                
Average Annual Return, Percent 10.33%   22.02%     12.66%     15.30%  
Diamond Hill Long-Short Fund | Investor Class | 60% Russell 1000/40% Bloomberg US T-Bills 1-3 Month Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   60% Russell 1000/40% Bloomberg US T-Bills 1-3 Month Index                
Average Annual Return, Percent 7.02%   14.67%     9.28%     10.27%  
Diamond Hill Long-Short Fund | Class I | Russell 1000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Index                
Average Annual Return, Percent 10.33%   22.02%     12.66%     15.30%  
Diamond Hill Long-Short Fund | Class I | 60% Russell 1000/40% Bloomberg US T-Bills 1-3 Month Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   60% Russell 1000/40% Bloomberg US T-Bills 1-3 Month Index                
Average Annual Return, Percent 7.02%   14.67%     9.28%     10.27%  
Diamond Hill Long-Short Fund | Class Y | Russell 1000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Index                
Average Annual Return, Percent 10.33%   22.02%     12.66%     15.30%  
Diamond Hill Long-Short Fund | Class Y | 60% Russell 1000/40% Bloomberg US T-Bills 1-3 Month Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   60% Russell 1000/40% Bloomberg US T-Bills 1-3 Month Index                
Average Annual Return, Percent 7.02%   14.67%     9.28%     10.27%  
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Bloomberg 1-3 Year US Government/Credit Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg 1-3 Year US Government/Credit Index                
Average Annual Return, Percent 0.77%   3.14%     2.12%       1.99%
Diamond Hill Short Duration Securitized Bond Fund | Class I | Bloomberg 1-3 Year US Government/Credit Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg 1-3 Year US Government/Credit Index                
Average Annual Return, Percent 0.77%   3.14%     2.12%       1.99%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | Bloomberg 1-3 Year US Government/Credit Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg 1-3 Year US Government/Credit Index                
Average Annual Return, Percent 0.77%   3.14%     2.12%       1.99%
Diamond Hill Securitized Total Return Fund | Investor Class | Bloomber US Securitized: MBS, ABS and CMBS Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Securitized: MBS, ABS and CMBS Index                
Average Annual Return, Percent 0.98%   5.12% 5.12%            
Diamond Hill Securitized Total Return Fund | Class I | Bloomber US Securitized: MBS, ABS and CMBS Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Securitized: MBS, ABS and CMBS Index                
Average Annual Return, Percent 0.98%   5.12% 5.12%            
Diamond Hill Securitized Total Return Fund | Class Y | Bloomber US Securitized: MBS, ABS and CMBS Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Bloomberg US Securitized: MBS, ABS and CMBS Index                
Average Annual Return, Percent 0.98%   5.12% 5.12%            
Diamond Hill Large Cap Concentrated ETF Shares | Russell 1000 Value Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Value Index                
Average Annual Return, Percent 16.26%   27.12%     11.17% 12.69%      
Diamond Hill Large Cap Concentrated ETF Shares | Russell 1000 Index                    
Average Annual Return [Line Items]                    
Line Graph and Table Measure Name   Russell 1000 Index                
Average Annual Return, Percent 10.33%   22.02%     12.66% 14.33%