v3.26.1
Shareholder Report, Holdings (Details)
Jun. 30, 2026
Diamond Hill Small Cap Fund | Investor Class | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 25.10%
Diamond Hill Small Cap Fund | Investor Class | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 16.90%
Diamond Hill Small Cap Fund | Investor Class | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Diamond Hill Small Cap Fund | Investor Class | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
Diamond Hill Small Cap Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
Diamond Hill Small Cap Fund | Investor Class | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Diamond Hill Small Cap Fund | Investor Class | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
Diamond Hill Small Cap Fund | Investor Class | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
Diamond Hill Small Cap Fund | Investor Class | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Small Cap Fund | Investor Class | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Small Cap Fund | Investor Class | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Diamond Hill Small Cap Fund | Investor Class | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (8.50%)
Diamond Hill Small Cap Fund | Investor Class | Astrana Health, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Diamond Hill Small Cap Fund | Investor Class | Triumph Financial, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Diamond Hill Small Cap Fund | Investor Class | Ducommun, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Diamond Hill Small Cap Fund | Investor Class | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Diamond Hill Small Cap Fund | Investor Class | Ryman Hospitality Properties, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Small Cap Fund | Investor Class | UFP Technologies, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Small Cap Fund | Investor Class | Bank OZK  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Small Cap Fund | Investor Class | Mesa Laboratories, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Diamond Hill Small Cap Fund | Investor Class | Utz Brands, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Diamond Hill Small Cap Fund | Investor Class | Magnolia Oil & Gas Corp., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Small Cap Fund | Class I | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 25.10%
Diamond Hill Small Cap Fund | Class I | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 16.90%
Diamond Hill Small Cap Fund | Class I | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Diamond Hill Small Cap Fund | Class I | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
Diamond Hill Small Cap Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
Diamond Hill Small Cap Fund | Class I | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Diamond Hill Small Cap Fund | Class I | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
Diamond Hill Small Cap Fund | Class I | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
Diamond Hill Small Cap Fund | Class I | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Small Cap Fund | Class I | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Small Cap Fund | Class I | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Diamond Hill Small Cap Fund | Class I | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (8.50%)
Diamond Hill Small Cap Fund | Class I | Astrana Health, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Diamond Hill Small Cap Fund | Class I | Triumph Financial, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Diamond Hill Small Cap Fund | Class I | Ducommun, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Diamond Hill Small Cap Fund | Class I | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Diamond Hill Small Cap Fund | Class I | Ryman Hospitality Properties, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Small Cap Fund | Class I | UFP Technologies, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Small Cap Fund | Class I | Bank OZK  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Small Cap Fund | Class I | Mesa Laboratories, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Diamond Hill Small Cap Fund | Class I | Utz Brands, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Diamond Hill Small Cap Fund | Class I | Magnolia Oil & Gas Corp., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Small Cap Fund | Class Y | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 25.10%
Diamond Hill Small Cap Fund | Class Y | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 16.90%
Diamond Hill Small Cap Fund | Class Y | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Diamond Hill Small Cap Fund | Class Y | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
Diamond Hill Small Cap Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
Diamond Hill Small Cap Fund | Class Y | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Diamond Hill Small Cap Fund | Class Y | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
Diamond Hill Small Cap Fund | Class Y | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
Diamond Hill Small Cap Fund | Class Y | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Small Cap Fund | Class Y | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Small Cap Fund | Class Y | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Diamond Hill Small Cap Fund | Class Y | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (8.50%)
Diamond Hill Small Cap Fund | Class Y | Astrana Health, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Diamond Hill Small Cap Fund | Class Y | Triumph Financial, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Diamond Hill Small Cap Fund | Class Y | Ducommun, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Diamond Hill Small Cap Fund | Class Y | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Diamond Hill Small Cap Fund | Class Y | Ryman Hospitality Properties, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Small Cap Fund | Class Y | UFP Technologies, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Small Cap Fund | Class Y | Bank OZK  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Small Cap Fund | Class Y | Mesa Laboratories, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Diamond Hill Small Cap Fund | Class Y | Utz Brands, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Diamond Hill Small Cap Fund | Class Y | Magnolia Oil & Gas Corp., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Small-Mid Cap Fund | Investor Class | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 25.10%
Diamond Hill Small-Mid Cap Fund | Investor Class | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
Diamond Hill Small-Mid Cap Fund | Investor Class | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.40%
Diamond Hill Small-Mid Cap Fund | Investor Class | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Diamond Hill Small-Mid Cap Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
Diamond Hill Small-Mid Cap Fund | Investor Class | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Small-Mid Cap Fund | Investor Class | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Small-Mid Cap Fund | Investor Class | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Diamond Hill Small-Mid Cap Fund | Investor Class | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
Diamond Hill Small-Mid Cap Fund | Investor Class | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Small-Mid Cap Fund | Investor Class | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Small-Mid Cap Fund | Investor Class | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (13.60%)
Diamond Hill Small-Mid Cap Fund | Investor Class | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Small-Mid Cap Fund | Investor Class | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Small-Mid Cap Fund | Investor Class | Humana, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Small-Mid Cap Fund | Investor Class | Regal Rexnord Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Small-Mid Cap Fund | Investor Class | Antero Resources Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Small-Mid Cap Fund | Investor Class | CubeSmart  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Diamond Hill Small-Mid Cap Fund | Investor Class | Post Holdings, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Small-Mid Cap Fund | Investor Class | Huntington Ingalls Industries, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Diamond Hill Small-Mid Cap Fund | Investor Class | Fortune Brands Innovations, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Small-Mid Cap Fund | Investor Class | Illumina, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Small-Mid Cap Fund | Investor Class | TransUnion  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Diamond Hill Small-Mid Cap Fund | Class I | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 25.10%
Diamond Hill Small-Mid Cap Fund | Class I | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
Diamond Hill Small-Mid Cap Fund | Class I | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.40%
Diamond Hill Small-Mid Cap Fund | Class I | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Diamond Hill Small-Mid Cap Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
Diamond Hill Small-Mid Cap Fund | Class I | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Small-Mid Cap Fund | Class I | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Small-Mid Cap Fund | Class I | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Diamond Hill Small-Mid Cap Fund | Class I | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
Diamond Hill Small-Mid Cap Fund | Class I | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Small-Mid Cap Fund | Class I | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Small-Mid Cap Fund | Class I | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (13.60%)
Diamond Hill Small-Mid Cap Fund | Class I | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Small-Mid Cap Fund | Class I | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Small-Mid Cap Fund | Class I | Humana, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Small-Mid Cap Fund | Class I | Regal Rexnord Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Small-Mid Cap Fund | Class I | Antero Resources Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Small-Mid Cap Fund | Class I | CubeSmart  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Diamond Hill Small-Mid Cap Fund | Class I | Post Holdings, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Small-Mid Cap Fund | Class I | Huntington Ingalls Industries, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Diamond Hill Small-Mid Cap Fund | Class I | Fortune Brands Innovations, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Small-Mid Cap Fund | Class I | Illumina, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Small-Mid Cap Fund | Class I | TransUnion  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Diamond Hill Small-Mid Cap Fund | Class Y | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 25.10%
Diamond Hill Small-Mid Cap Fund | Class Y | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
Diamond Hill Small-Mid Cap Fund | Class Y | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.40%
Diamond Hill Small-Mid Cap Fund | Class Y | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Diamond Hill Small-Mid Cap Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
Diamond Hill Small-Mid Cap Fund | Class Y | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Small-Mid Cap Fund | Class Y | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Small-Mid Cap Fund | Class Y | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Diamond Hill Small-Mid Cap Fund | Class Y | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
Diamond Hill Small-Mid Cap Fund | Class Y | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Small-Mid Cap Fund | Class Y | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Small-Mid Cap Fund | Class Y | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (13.60%)
Diamond Hill Small-Mid Cap Fund | Class Y | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Small-Mid Cap Fund | Class Y | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Small-Mid Cap Fund | Class Y | Humana, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Small-Mid Cap Fund | Class Y | Regal Rexnord Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Small-Mid Cap Fund | Class Y | Antero Resources Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Small-Mid Cap Fund | Class Y | CubeSmart  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Diamond Hill Small-Mid Cap Fund | Class Y | Post Holdings, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Small-Mid Cap Fund | Class Y | Huntington Ingalls Industries, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Diamond Hill Small-Mid Cap Fund | Class Y | Fortune Brands Innovations, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Small-Mid Cap Fund | Class Y | Illumina, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Small-Mid Cap Fund | Class Y | TransUnion  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Diamond Hill Mid Cap Fund | Investor Class | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Diamond Hill Mid Cap Fund | Investor Class | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 12.20%
Diamond Hill Mid Cap Fund | Investor Class | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.50%
Diamond Hill Mid Cap Fund | Investor Class | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Diamond Hill Mid Cap Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
Diamond Hill Mid Cap Fund | Investor Class | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Diamond Hill Mid Cap Fund | Investor Class | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Mid Cap Fund | Investor Class | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Diamond Hill Mid Cap Fund | Investor Class | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Diamond Hill Mid Cap Fund | Investor Class | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Mid Cap Fund | Investor Class | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Mid Cap Fund | Investor Class | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (10.60%)
Diamond Hill Mid Cap Fund | Investor Class | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Mid Cap Fund | Investor Class | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Mid Cap Fund | Investor Class | Humana, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Diamond Hill Mid Cap Fund | Investor Class | Regal Rexnord Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Diamond Hill Mid Cap Fund | Investor Class | Antero Resources Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Mid Cap Fund | Investor Class | CubeSmart  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Diamond Hill Mid Cap Fund | Investor Class | Huntington Ingalls Industries, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Mid Cap Fund | Investor Class | Fortune Brands Innovations, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Mid Cap Fund | Investor Class | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Mid Cap Fund | Investor Class | Diamondback Energy, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Diamond Hill Mid Cap Fund | Investor Class | Rocket Companies, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Mid Cap Fund | Class I | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Diamond Hill Mid Cap Fund | Class I | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 12.20%
Diamond Hill Mid Cap Fund | Class I | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.50%
Diamond Hill Mid Cap Fund | Class I | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Diamond Hill Mid Cap Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
Diamond Hill Mid Cap Fund | Class I | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Diamond Hill Mid Cap Fund | Class I | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Mid Cap Fund | Class I | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Diamond Hill Mid Cap Fund | Class I | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Diamond Hill Mid Cap Fund | Class I | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Mid Cap Fund | Class I | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Mid Cap Fund | Class I | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (10.60%)
Diamond Hill Mid Cap Fund | Class I | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Mid Cap Fund | Class I | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Mid Cap Fund | Class I | Humana, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Diamond Hill Mid Cap Fund | Class I | Regal Rexnord Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Diamond Hill Mid Cap Fund | Class I | Antero Resources Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Mid Cap Fund | Class I | CubeSmart  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Diamond Hill Mid Cap Fund | Class I | Huntington Ingalls Industries, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Mid Cap Fund | Class I | Fortune Brands Innovations, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Mid Cap Fund | Class I | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Mid Cap Fund | Class I | Diamondback Energy, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Diamond Hill Mid Cap Fund | Class I | Rocket Companies, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Mid Cap Fund | Class Y | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Diamond Hill Mid Cap Fund | Class Y | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 12.20%
Diamond Hill Mid Cap Fund | Class Y | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.50%
Diamond Hill Mid Cap Fund | Class Y | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Diamond Hill Mid Cap Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
Diamond Hill Mid Cap Fund | Class Y | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Diamond Hill Mid Cap Fund | Class Y | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Mid Cap Fund | Class Y | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Diamond Hill Mid Cap Fund | Class Y | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Diamond Hill Mid Cap Fund | Class Y | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Mid Cap Fund | Class Y | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Mid Cap Fund | Class Y | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (10.60%)
Diamond Hill Mid Cap Fund | Class Y | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Mid Cap Fund | Class Y | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Mid Cap Fund | Class Y | Humana, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Diamond Hill Mid Cap Fund | Class Y | Regal Rexnord Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Diamond Hill Mid Cap Fund | Class Y | Antero Resources Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Mid Cap Fund | Class Y | CubeSmart  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Diamond Hill Mid Cap Fund | Class Y | Huntington Ingalls Industries, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Mid Cap Fund | Class Y | Fortune Brands Innovations, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Mid Cap Fund | Class Y | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Mid Cap Fund | Class Y | Diamondback Energy, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Diamond Hill Mid Cap Fund | Class Y | Rocket Companies, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Large Cap Fund | Investor Class | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
Diamond Hill Large Cap Fund | Investor Class | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 23.90%
Diamond Hill Large Cap Fund | Investor Class | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.40%
Diamond Hill Large Cap Fund | Investor Class | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Large Cap Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Diamond Hill Large Cap Fund | Investor Class | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 10.70%
Diamond Hill Large Cap Fund | Investor Class | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Large Cap Fund | Investor Class | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Large Cap Fund | Investor Class | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Diamond Hill Large Cap Fund | Investor Class | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 9.60%
Diamond Hill Large Cap Fund | Investor Class | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (5.30%)
Diamond Hill Large Cap Fund | Investor Class | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Large Cap Fund | Investor Class | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Large Cap Fund | Investor Class | Colgate-Palmolive Co.  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Diamond Hill Large Cap Fund | Investor Class | Berkshire Hathaway, Inc., Class B  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Diamond Hill Large Cap Fund | Investor Class | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Diamond Hill Large Cap Fund | Investor Class | Aon plc, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Large Cap Fund | Investor Class | Waste Management, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Large Cap Fund | Investor Class | ConocoPhillips  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Large Cap Fund | Investor Class | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Large Cap Fund | Investor Class | Microsoft Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Large Cap Fund | Investor Class | Walt Disney Co. (The)  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Large Cap Fund | Class I | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
Diamond Hill Large Cap Fund | Class I | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 23.90%
Diamond Hill Large Cap Fund | Class I | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.40%
Diamond Hill Large Cap Fund | Class I | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Large Cap Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Diamond Hill Large Cap Fund | Class I | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 10.70%
Diamond Hill Large Cap Fund | Class I | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Large Cap Fund | Class I | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Large Cap Fund | Class I | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Diamond Hill Large Cap Fund | Class I | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 9.60%
Diamond Hill Large Cap Fund | Class I | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (5.30%)
Diamond Hill Large Cap Fund | Class I | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Large Cap Fund | Class I | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Large Cap Fund | Class I | Colgate-Palmolive Co.  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Diamond Hill Large Cap Fund | Class I | Berkshire Hathaway, Inc., Class B  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Diamond Hill Large Cap Fund | Class I | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Diamond Hill Large Cap Fund | Class I | Aon plc, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Large Cap Fund | Class I | Waste Management, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Large Cap Fund | Class I | ConocoPhillips  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Large Cap Fund | Class I | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Large Cap Fund | Class I | Microsoft Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Large Cap Fund | Class I | Walt Disney Co. (The)  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Large Cap Fund | Class Y | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
Diamond Hill Large Cap Fund | Class Y | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 23.90%
Diamond Hill Large Cap Fund | Class Y | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.40%
Diamond Hill Large Cap Fund | Class Y | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Large Cap Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Diamond Hill Large Cap Fund | Class Y | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 10.70%
Diamond Hill Large Cap Fund | Class Y | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Large Cap Fund | Class Y | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Large Cap Fund | Class Y | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Diamond Hill Large Cap Fund | Class Y | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 9.60%
Diamond Hill Large Cap Fund | Class Y | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (5.30%)
Diamond Hill Large Cap Fund | Class Y | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Large Cap Fund | Class Y | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Large Cap Fund | Class Y | Colgate-Palmolive Co.  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Diamond Hill Large Cap Fund | Class Y | Berkshire Hathaway, Inc., Class B  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Diamond Hill Large Cap Fund | Class Y | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Diamond Hill Large Cap Fund | Class Y | Aon plc, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Large Cap Fund | Class Y | Waste Management, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill Large Cap Fund | Class Y | ConocoPhillips  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Large Cap Fund | Class Y | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Large Cap Fund | Class Y | Microsoft Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Large Cap Fund | Class Y | Walt Disney Co. (The)  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Select Fund | Investor Class | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 17.20%
Diamond Hill Select Fund | Investor Class | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 25.10%
Diamond Hill Select Fund | Investor Class | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
Diamond Hill Select Fund | Investor Class | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Diamond Hill Select Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
Diamond Hill Select Fund | Investor Class | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Diamond Hill Select Fund | Investor Class | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
Diamond Hill Select Fund | Investor Class | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Select Fund | Investor Class | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Diamond Hill Select Fund | Investor Class | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
Diamond Hill Select Fund | Investor Class | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (13.60%)
Diamond Hill Select Fund | Investor Class | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Diamond Hill Select Fund | Investor Class | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Diamond Hill Select Fund | Investor Class | Colgate-Palmolive Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Select Fund | Investor Class | Berkshire Hathaway, Inc., Class B  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
Diamond Hill Select Fund | Investor Class | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
Diamond Hill Select Fund | Investor Class | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Select Fund | Investor Class | Cimpress plc  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Diamond Hill Select Fund | Investor Class | Salesforce, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Diamond Hill Select Fund | Investor Class | Ashland, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Select Fund | Investor Class | Adobe, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Diamond Hill Select Fund | Class I | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 17.20%
Diamond Hill Select Fund | Class I | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 25.10%
Diamond Hill Select Fund | Class I | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
Diamond Hill Select Fund | Class I | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Diamond Hill Select Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
Diamond Hill Select Fund | Class I | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Diamond Hill Select Fund | Class I | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
Diamond Hill Select Fund | Class I | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Select Fund | Class I | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Diamond Hill Select Fund | Class I | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
Diamond Hill Select Fund | Class I | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (13.60%)
Diamond Hill Select Fund | Class I | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Diamond Hill Select Fund | Class I | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Diamond Hill Select Fund | Class I | Colgate-Palmolive Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Select Fund | Class I | Berkshire Hathaway, Inc., Class B  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
Diamond Hill Select Fund | Class I | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
Diamond Hill Select Fund | Class I | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Select Fund | Class I | Cimpress plc  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Diamond Hill Select Fund | Class I | Salesforce, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Diamond Hill Select Fund | Class I | Ashland, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Select Fund | Class I | Adobe, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Diamond Hill Select Fund | Class Y | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 17.20%
Diamond Hill Select Fund | Class Y | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 25.10%
Diamond Hill Select Fund | Class Y | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
Diamond Hill Select Fund | Class Y | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Diamond Hill Select Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
Diamond Hill Select Fund | Class Y | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Diamond Hill Select Fund | Class Y | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
Diamond Hill Select Fund | Class Y | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Select Fund | Class Y | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Diamond Hill Select Fund | Class Y | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
Diamond Hill Select Fund | Class Y | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (13.60%)
Diamond Hill Select Fund | Class Y | Red Rock Resorts, Inc. Class A  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Diamond Hill Select Fund | Class Y | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Diamond Hill Select Fund | Class Y | Colgate-Palmolive Co.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Diamond Hill Select Fund | Class Y | Berkshire Hathaway, Inc., Class B  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
Diamond Hill Select Fund | Class Y | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
Diamond Hill Select Fund | Class Y | Capital One Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Select Fund | Class Y | Cimpress plc  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Diamond Hill Select Fund | Class Y | Salesforce, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Diamond Hill Select Fund | Class Y | Ashland, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Select Fund | Class Y | Adobe, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Diamond Hill Long-Short Fund | Investor Class | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Diamond Hill Long-Short Fund | Investor Class | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 18.50%
Diamond Hill Long-Short Fund | Investor Class | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.10%
Diamond Hill Long-Short Fund | Investor Class | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Long-Short Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
Diamond Hill Long-Short Fund | Investor Class | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Diamond Hill Long-Short Fund | Investor Class | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Diamond Hill Long-Short Fund | Investor Class | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Long-Short Fund | Investor Class | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Long-Short Fund | Investor Class | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Diamond Hill Long-Short Fund | Investor Class | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 21.80%
Diamond Hill Long-Short Fund | Investor Class | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Diamond Hill Long-Short Fund | Investor Class | Short: Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value (12.60%)
Diamond Hill Long-Short Fund | Investor Class | Short: Industrials  
Holdings [Line Items]  
Percent of Net Asset Value (6.70%)
Diamond Hill Long-Short Fund | Investor Class | Short: Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value (5.30%)
Diamond Hill Long-Short Fund | Investor Class | Short: Financials  
Holdings [Line Items]  
Percent of Net Asset Value (3.10%)
Diamond Hill Long-Short Fund | Investor Class | Short: Real Estate  
Holdings [Line Items]  
Percent of Net Asset Value (2.50%)
Diamond Hill Long-Short Fund | Investor Class | Short: Health Care  
Holdings [Line Items]  
Percent of Net Asset Value (1.90%)
Diamond Hill Long-Short Fund | Investor Class | Short: Materials  
Holdings [Line Items]  
Percent of Net Asset Value (1.60%)
Diamond Hill Long-Short Fund | Investor Class | Short: Energy  
Holdings [Line Items]  
Percent of Net Asset Value (1.30%)
Diamond Hill Long-Short Fund | Investor Class | Short: Utilities  
Holdings [Line Items]  
Percent of Net Asset Value (0.60%)
Diamond Hill Long-Short Fund | Investor Class | Short: Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value (0.50%)
Diamond Hill Long-Short Fund | Investor Class | Short: Segregated Cash with Custodian  
Holdings [Line Items]  
Percent of Net Asset Value 36.90%
Diamond Hill Long-Short Fund | Investor Class | Short: Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (1.50%)
Diamond Hill Long-Short Fund | Investor Class | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Long-Short Fund | Investor Class | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Long-Short Fund | Investor Class | Aon plc, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Long-Short Fund | Investor Class | Microsoft Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Diamond Hill Long-Short Fund | Investor Class | Taiwan Semiconductor Manufacturing Co. Ltd. - ADR  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Diamond Hill Long-Short Fund | Investor Class | Alphabet, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Diamond Hill Long-Short Fund | Investor Class | Meta Platforms, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Diamond Hill Long-Short Fund | Investor Class | SentinelOne, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Long-Short Fund | Investor Class | Amazon.com, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Long-Short Fund | Investor Class | Citigroup, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Diamond Hill Long-Short Fund | Investor Class | NewMarket Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.50%)
Diamond Hill Long-Short Fund | Investor Class | Federal Signal Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.50%)
Diamond Hill Long-Short Fund | Investor Class | Medpace Holdings, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.60%)
Diamond Hill Long-Short Fund | Investor Class | Acushnet Holdings Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.70%)
Diamond Hill Long-Short Fund | Investor Class | Bank of Hawaii Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.70%)
Diamond Hill Long-Short Fund | Investor Class | Blue Bird Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.70%)
Diamond Hill Long-Short Fund | Investor Class | eBay, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.80%)
Diamond Hill Long-Short Fund | Investor Class | International Business Machines Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.80%)
Diamond Hill Long-Short Fund | Investor Class | Matson, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.90%)
Diamond Hill Long-Short Fund | Investor Class | Williams Sonoma, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.90%)
Diamond Hill Long-Short Fund | Class I | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Diamond Hill Long-Short Fund | Class I | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 18.50%
Diamond Hill Long-Short Fund | Class I | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.10%
Diamond Hill Long-Short Fund | Class I | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Long-Short Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
Diamond Hill Long-Short Fund | Class I | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Diamond Hill Long-Short Fund | Class I | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Diamond Hill Long-Short Fund | Class I | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Long-Short Fund | Class I | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Long-Short Fund | Class I | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Diamond Hill Long-Short Fund | Class I | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 21.80%
Diamond Hill Long-Short Fund | Class I | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Diamond Hill Long-Short Fund | Class I | Short: Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value (12.60%)
Diamond Hill Long-Short Fund | Class I | Short: Industrials  
Holdings [Line Items]  
Percent of Net Asset Value (6.70%)
Diamond Hill Long-Short Fund | Class I | Short: Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value (5.30%)
Diamond Hill Long-Short Fund | Class I | Short: Financials  
Holdings [Line Items]  
Percent of Net Asset Value (3.10%)
Diamond Hill Long-Short Fund | Class I | Short: Real Estate  
Holdings [Line Items]  
Percent of Net Asset Value (2.50%)
Diamond Hill Long-Short Fund | Class I | Short: Health Care  
Holdings [Line Items]  
Percent of Net Asset Value (1.90%)
Diamond Hill Long-Short Fund | Class I | Short: Materials  
Holdings [Line Items]  
Percent of Net Asset Value (1.60%)
Diamond Hill Long-Short Fund | Class I | Short: Energy  
Holdings [Line Items]  
Percent of Net Asset Value (1.30%)
Diamond Hill Long-Short Fund | Class I | Short: Utilities  
Holdings [Line Items]  
Percent of Net Asset Value (0.60%)
Diamond Hill Long-Short Fund | Class I | Short: Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value (0.50%)
Diamond Hill Long-Short Fund | Class I | Short: Segregated Cash with Custodian  
Holdings [Line Items]  
Percent of Net Asset Value 36.90%
Diamond Hill Long-Short Fund | Class I | Short: Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (1.50%)
Diamond Hill Long-Short Fund | Class I | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Long-Short Fund | Class I | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Long-Short Fund | Class I | Aon plc, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Long-Short Fund | Class I | Microsoft Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Diamond Hill Long-Short Fund | Class I | Taiwan Semiconductor Manufacturing Co. Ltd. - ADR  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Diamond Hill Long-Short Fund | Class I | Alphabet, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Diamond Hill Long-Short Fund | Class I | Meta Platforms, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Diamond Hill Long-Short Fund | Class I | SentinelOne, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Long-Short Fund | Class I | Amazon.com, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Long-Short Fund | Class I | Citigroup, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Diamond Hill Long-Short Fund | Class I | NewMarket Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.50%)
Diamond Hill Long-Short Fund | Class I | Federal Signal Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.50%)
Diamond Hill Long-Short Fund | Class I | Medpace Holdings, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.60%)
Diamond Hill Long-Short Fund | Class I | Acushnet Holdings Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.70%)
Diamond Hill Long-Short Fund | Class I | Bank of Hawaii Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.70%)
Diamond Hill Long-Short Fund | Class I | Blue Bird Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.70%)
Diamond Hill Long-Short Fund | Class I | eBay, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.80%)
Diamond Hill Long-Short Fund | Class I | International Business Machines Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.80%)
Diamond Hill Long-Short Fund | Class I | Matson, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.90%)
Diamond Hill Long-Short Fund | Class I | Williams Sonoma, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.90%)
Diamond Hill Long-Short Fund | Class Y | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Diamond Hill Long-Short Fund | Class Y | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 18.50%
Diamond Hill Long-Short Fund | Class Y | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.10%
Diamond Hill Long-Short Fund | Class Y | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Long-Short Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
Diamond Hill Long-Short Fund | Class Y | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Diamond Hill Long-Short Fund | Class Y | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Diamond Hill Long-Short Fund | Class Y | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Long-Short Fund | Class Y | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Long-Short Fund | Class Y | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Diamond Hill Long-Short Fund | Class Y | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 21.80%
Diamond Hill Long-Short Fund | Class Y | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Diamond Hill Long-Short Fund | Class Y | Short: Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value (12.60%)
Diamond Hill Long-Short Fund | Class Y | Short: Industrials  
Holdings [Line Items]  
Percent of Net Asset Value (6.70%)
Diamond Hill Long-Short Fund | Class Y | Short: Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value (5.30%)
Diamond Hill Long-Short Fund | Class Y | Short: Financials  
Holdings [Line Items]  
Percent of Net Asset Value (3.10%)
Diamond Hill Long-Short Fund | Class Y | Short: Real Estate  
Holdings [Line Items]  
Percent of Net Asset Value (2.50%)
Diamond Hill Long-Short Fund | Class Y | Short: Health Care  
Holdings [Line Items]  
Percent of Net Asset Value (1.90%)
Diamond Hill Long-Short Fund | Class Y | Short: Materials  
Holdings [Line Items]  
Percent of Net Asset Value (1.60%)
Diamond Hill Long-Short Fund | Class Y | Short: Energy  
Holdings [Line Items]  
Percent of Net Asset Value (1.30%)
Diamond Hill Long-Short Fund | Class Y | Short: Utilities  
Holdings [Line Items]  
Percent of Net Asset Value (0.60%)
Diamond Hill Long-Short Fund | Class Y | Short: Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value (0.50%)
Diamond Hill Long-Short Fund | Class Y | Short: Segregated Cash with Custodian  
Holdings [Line Items]  
Percent of Net Asset Value 36.90%
Diamond Hill Long-Short Fund | Class Y | Short: Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (1.50%)
Diamond Hill Long-Short Fund | Class Y | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Diamond Hill Long-Short Fund | Class Y | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Long-Short Fund | Class Y | Aon plc, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill Long-Short Fund | Class Y | Microsoft Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Diamond Hill Long-Short Fund | Class Y | Taiwan Semiconductor Manufacturing Co. Ltd. - ADR  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Diamond Hill Long-Short Fund | Class Y | Alphabet, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Diamond Hill Long-Short Fund | Class Y | Meta Platforms, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Diamond Hill Long-Short Fund | Class Y | SentinelOne, Inc., Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Long-Short Fund | Class Y | Amazon.com, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Long-Short Fund | Class Y | Citigroup, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Diamond Hill Long-Short Fund | Class Y | NewMarket Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.50%)
Diamond Hill Long-Short Fund | Class Y | Federal Signal Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.50%)
Diamond Hill Long-Short Fund | Class Y | Medpace Holdings, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.60%)
Diamond Hill Long-Short Fund | Class Y | Acushnet Holdings Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.70%)
Diamond Hill Long-Short Fund | Class Y | Bank of Hawaii Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.70%)
Diamond Hill Long-Short Fund | Class Y | Blue Bird Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.70%)
Diamond Hill Long-Short Fund | Class Y | eBay, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.80%)
Diamond Hill Long-Short Fund | Class Y | International Business Machines Corp.  
Holdings [Line Items]  
Percent of Net Asset Value (1.80%)
Diamond Hill Long-Short Fund | Class Y | Matson, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.90%)
Diamond Hill Long-Short Fund | Class Y | Williams Sonoma, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value (1.90%)
Diamond Hill International Fund | Investor Class | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 23.00%
Diamond Hill International Fund | Investor Class | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
Diamond Hill International Fund | Investor Class | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Diamond Hill International Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
Diamond Hill International Fund | Investor Class | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Diamond Hill International Fund | Investor Class | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Diamond Hill International Fund | Investor Class | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Diamond Hill International Fund | Investor Class | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
Diamond Hill International Fund | Investor Class | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill International Fund | Investor Class | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 14.50%
Diamond Hill International Fund | Investor Class | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (7.90%)
Diamond Hill International Fund | Investor Class | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill International Fund | Investor Class | Taiwan Semiconductor Manufacturing Co. Ltd. - ADR  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
Diamond Hill International Fund | Investor Class | SK hynix, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill International Fund | Investor Class | AIB Group plc  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Diamond Hill International Fund | Investor Class | Glencore plc  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Diamond Hill International Fund | Investor Class | British American Tobacco plc  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Diamond Hill International Fund | Investor Class | Samsung Electronics Co. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Diamond Hill International Fund | Investor Class | Singapore Exchange Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Diamond Hill International Fund | Investor Class | Compagnie Financiere Richemont SA, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill International Fund | Investor Class | Veolia Environment SA  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill International Fund | Investor Class | Max Co. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill International Fund | Class I | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 23.00%
Diamond Hill International Fund | Class I | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
Diamond Hill International Fund | Class I | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Diamond Hill International Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
Diamond Hill International Fund | Class I | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Diamond Hill International Fund | Class I | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Diamond Hill International Fund | Class I | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Diamond Hill International Fund | Class I | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
Diamond Hill International Fund | Class I | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill International Fund | Class I | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 14.50%
Diamond Hill International Fund | Class I | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (7.90%)
Diamond Hill International Fund | Class I | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill International Fund | Class I | Taiwan Semiconductor Manufacturing Co. Ltd. - ADR  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
Diamond Hill International Fund | Class I | SK hynix, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill International Fund | Class I | AIB Group plc  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Diamond Hill International Fund | Class I | Glencore plc  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Diamond Hill International Fund | Class I | British American Tobacco plc  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Diamond Hill International Fund | Class I | Samsung Electronics Co. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Diamond Hill International Fund | Class I | Singapore Exchange Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Diamond Hill International Fund | Class I | Compagnie Financiere Richemont SA, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill International Fund | Class I | Veolia Environment SA  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill International Fund | Class I | Max Co. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill International Fund | Class Y | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 23.00%
Diamond Hill International Fund | Class Y | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
Diamond Hill International Fund | Class Y | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Diamond Hill International Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
Diamond Hill International Fund | Class Y | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Diamond Hill International Fund | Class Y | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Diamond Hill International Fund | Class Y | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Diamond Hill International Fund | Class Y | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
Diamond Hill International Fund | Class Y | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill International Fund | Class Y | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 14.50%
Diamond Hill International Fund | Class Y | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (7.90%)
Diamond Hill International Fund | Class Y | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill International Fund | Class Y | Taiwan Semiconductor Manufacturing Co. Ltd. - ADR  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
Diamond Hill International Fund | Class Y | SK hynix, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Diamond Hill International Fund | Class Y | AIB Group plc  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Diamond Hill International Fund | Class Y | Glencore plc  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Diamond Hill International Fund | Class Y | British American Tobacco plc  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Diamond Hill International Fund | Class Y | Samsung Electronics Co. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Diamond Hill International Fund | Class Y | Singapore Exchange Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Diamond Hill International Fund | Class Y | Compagnie Financiere Richemont SA, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Diamond Hill International Fund | Class Y | Veolia Environment SA  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill International Fund | Class Y | Max Co. Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 82.80%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Corporate Credit  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Treasury  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Other Assets in Excess of Liabilities  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | US Bank NA, Series 2026-SUP1, Class B1 5.500% 06/27/33  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | U.S. Treasury Notes 3.625% 05/31/28  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | MultiFamily Structured Credit Risk, Series 2021-MN2 8.685% 07/25/41  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | U.S. Treasury Notes 2.250% 08/15/27  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | GPCC Amortizing Receivables, Series 2026-1A, Class A 5.960% 06/16/36  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Life Financial Services Trust, Series 2022-BBMR2, Class A1 5.692% 05/15/39  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | HTAP Trust, Series 2024-2, Class A 6.500% 04/25/42  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | FNMA, Pool #MA6009 5.500% 03/01/46  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | GPCC Amortizing Receivables, Series 2026-1A, Class D 9.260% 06/16/36  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Investor Class | U.S. Treasury Notes 1.250% 09/30/28  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Diamond Hill Short Duration Securitized Bond Fund | Class I | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 82.80%
Diamond Hill Short Duration Securitized Bond Fund | Class I | Corporate Credit  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
Diamond Hill Short Duration Securitized Bond Fund | Class I | Treasury  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Diamond Hill Short Duration Securitized Bond Fund | Class I | Other Assets in Excess of Liabilities  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Diamond Hill Short Duration Securitized Bond Fund | Class I | US Bank NA, Series 2026-SUP1, Class B1 5.500% 06/27/33  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Short Duration Securitized Bond Fund | Class I | U.S. Treasury Notes 3.625% 05/31/28  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class I | MultiFamily Structured Credit Risk, Series 2021-MN2 8.685% 07/25/41  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class I | U.S. Treasury Notes 2.250% 08/15/27  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class I | GPCC Amortizing Receivables, Series 2026-1A, Class A 5.960% 06/16/36  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class I | Life Financial Services Trust, Series 2022-BBMR2, Class A1 5.692% 05/15/39  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class I | HTAP Trust, Series 2024-2, Class A 6.500% 04/25/42  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Class I | FNMA, Pool #MA6009 5.500% 03/01/46  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Class I | GPCC Amortizing Receivables, Series 2026-1A, Class D 9.260% 06/16/36  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Class I | U.S. Treasury Notes 1.250% 09/30/28  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 82.80%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | Corporate Credit  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | Treasury  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | Other Assets in Excess of Liabilities  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | US Bank NA, Series 2026-SUP1, Class B1 5.500% 06/27/33  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | U.S. Treasury Notes 3.625% 05/31/28  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | MultiFamily Structured Credit Risk, Series 2021-MN2 8.685% 07/25/41  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | U.S. Treasury Notes 2.250% 08/15/27  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | GPCC Amortizing Receivables, Series 2026-1A, Class A 5.960% 06/16/36  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | Life Financial Services Trust, Series 2022-BBMR2, Class A1 5.692% 05/15/39  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | HTAP Trust, Series 2024-2, Class A 6.500% 04/25/42  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | FNMA, Pool #MA6009 5.500% 03/01/46  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | GPCC Amortizing Receivables, Series 2026-1A, Class D 9.260% 06/16/36  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Short Duration Securitized Bond Fund | Class Y | U.S. Treasury Notes 1.250% 09/30/28  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Securitized Total Return Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Diamond Hill Securitized Total Return Fund | Investor Class | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 98.30%
Diamond Hill Securitized Total Return Fund | Investor Class | Other Assets in Excess of Liabilities  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Securitized Total Return Fund | Investor Class | FNMA, Series 2018-95, Class B 3.500% 01/25/49  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Diamond Hill Securitized Total Return Fund | Investor Class | FNMA, Series 2017-87, Class EA 3.000% 04/25/44  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Diamond Hill Securitized Total Return Fund | Investor Class | FNMA, Series 2012-103, Class ZP 3.000% 09/25/42  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Diamond Hill Securitized Total Return Fund | Investor Class | FHLMC, Series 4425, Class TA 2.000% 01/15/45  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Diamond Hill Securitized Total Return Fund | Investor Class | GNMA, Series 2009-54, Class Z 6.000% 07/16/39  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Diamond Hill Securitized Total Return Fund | Investor Class | FNMA, Series 2020-44, Class EG 2.000% 09/25/42  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Securitized Total Return Fund | Investor Class | RMF Buyout Issuance Trust 4.704% 11/25/31  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Securitized Total Return Fund | Investor Class | FHLMC, Series 4152, Class GW 2.500% 01/15/43  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Securitized Total Return Fund | Investor Class | GNMA, Series 2011-7, Class LS (IO) 2.183% 12/20/40  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Securitized Total Return Fund | Investor Class | FHLMC, Series 5071, Class ZT 1.500% 02/25/51  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Securitized Total Return Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Diamond Hill Securitized Total Return Fund | Class I | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 98.30%
Diamond Hill Securitized Total Return Fund | Class I | Other Assets in Excess of Liabilities  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Securitized Total Return Fund | Class I | FNMA, Series 2018-95, Class B 3.500% 01/25/49  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Diamond Hill Securitized Total Return Fund | Class I | FNMA, Series 2017-87, Class EA 3.000% 04/25/44  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Diamond Hill Securitized Total Return Fund | Class I | FNMA, Series 2012-103, Class ZP 3.000% 09/25/42  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Diamond Hill Securitized Total Return Fund | Class I | FHLMC, Series 4425, Class TA 2.000% 01/15/45  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Diamond Hill Securitized Total Return Fund | Class I | GNMA, Series 2009-54, Class Z 6.000% 07/16/39  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Diamond Hill Securitized Total Return Fund | Class I | FNMA, Series 2020-44, Class EG 2.000% 09/25/42  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Securitized Total Return Fund | Class I | RMF Buyout Issuance Trust 4.704% 11/25/31  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Securitized Total Return Fund | Class I | FHLMC, Series 4152, Class GW 2.500% 01/15/43  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Securitized Total Return Fund | Class I | GNMA, Series 2011-7, Class LS (IO) 2.183% 12/20/40  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Securitized Total Return Fund | Class I | FHLMC, Series 5071, Class ZT 1.500% 02/25/51  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Securitized Total Return Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Diamond Hill Securitized Total Return Fund | Class Y | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 98.30%
Diamond Hill Securitized Total Return Fund | Class Y | Other Assets in Excess of Liabilities  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Securitized Total Return Fund | Class Y | FNMA, Series 2018-95, Class B 3.500% 01/25/49  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Diamond Hill Securitized Total Return Fund | Class Y | FNMA, Series 2017-87, Class EA 3.000% 04/25/44  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Diamond Hill Securitized Total Return Fund | Class Y | FNMA, Series 2012-103, Class ZP 3.000% 09/25/42  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Diamond Hill Securitized Total Return Fund | Class Y | FHLMC, Series 4425, Class TA 2.000% 01/15/45  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Diamond Hill Securitized Total Return Fund | Class Y | GNMA, Series 2009-54, Class Z 6.000% 07/16/39  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Diamond Hill Securitized Total Return Fund | Class Y | FNMA, Series 2020-44, Class EG 2.000% 09/25/42  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Diamond Hill Securitized Total Return Fund | Class Y | RMF Buyout Issuance Trust 4.704% 11/25/31  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Securitized Total Return Fund | Class Y | FHLMC, Series 4152, Class GW 2.500% 01/15/43  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Securitized Total Return Fund | Class Y | GNMA, Series 2011-7, Class LS (IO) 2.183% 12/20/40  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Securitized Total Return Fund | Class Y | FHLMC, Series 5071, Class ZT 1.500% 02/25/51  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Core Bond Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Core Bond Fund | Investor Class | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (0.30%)
Diamond Hill Core Bond Fund | Investor Class | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 62.00%
Diamond Hill Core Bond Fund | Investor Class | Corporate Credit  
Holdings [Line Items]  
Percent of Net Asset Value 16.10%
Diamond Hill Core Bond Fund | Investor Class | Treasury  
Holdings [Line Items]  
Percent of Net Asset Value 20.70%
Diamond Hill Core Bond Fund | Investor Class | Government Related  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury Notes 1.250% 09/30/28  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury Bonds 3.000% 02/15/48  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury Notes 4.000% 02/15/34  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury Notes 0.625% 08/15/30  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury Bonds 1.625% 11/15/50  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury Bonds 2.250% 08/15/46  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury Bonds 1.125% 08/15/40  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury STRIPS 0.000% 11/15/38  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury STRIPS 0.625% 02/15/43  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Diamond Hill Core Bond Fund | Investor Class | U.S. Treasury Bonds 1.375% 11/15/40  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Diamond Hill Core Bond Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Core Bond Fund | Class I | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (0.30%)
Diamond Hill Core Bond Fund | Class I | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 62.00%
Diamond Hill Core Bond Fund | Class I | Corporate Credit  
Holdings [Line Items]  
Percent of Net Asset Value 16.10%
Diamond Hill Core Bond Fund | Class I | Treasury  
Holdings [Line Items]  
Percent of Net Asset Value 20.70%
Diamond Hill Core Bond Fund | Class I | Government Related  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury Notes 1.250% 09/30/28  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury Bonds 3.000% 02/15/48  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury Notes 4.000% 02/15/34  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury Notes 0.625% 08/15/30  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury Bonds 1.625% 11/15/50  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury Bonds 2.250% 08/15/46  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury Bonds 1.125% 08/15/40  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury STRIPS 0.000% 11/15/38  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury STRIPS 0.625% 02/15/43  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Diamond Hill Core Bond Fund | Class I | U.S. Treasury Bonds 1.375% 11/15/40  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Diamond Hill Core Bond Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Diamond Hill Core Bond Fund | Class Y | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (0.30%)
Diamond Hill Core Bond Fund | Class Y | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 62.00%
Diamond Hill Core Bond Fund | Class Y | Corporate Credit  
Holdings [Line Items]  
Percent of Net Asset Value 16.10%
Diamond Hill Core Bond Fund | Class Y | Treasury  
Holdings [Line Items]  
Percent of Net Asset Value 20.70%
Diamond Hill Core Bond Fund | Class Y | Government Related  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury Notes 1.250% 09/30/28  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury Bonds 3.000% 02/15/48  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury Notes 4.000% 02/15/34  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury Notes 0.625% 08/15/30  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury Bonds 1.625% 11/15/50  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury Bonds 2.250% 08/15/46  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury Bonds 1.125% 08/15/40  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury STRIPS 0.000% 11/15/38  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury STRIPS 0.625% 02/15/43  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Diamond Hill Core Bond Fund | Class Y | U.S. Treasury Bonds 1.375% 11/15/40  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Diamond Hill Core Plus Bond Fund | Investor Class | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Core Plus Bond Fund | Investor Class | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (1.80%)
Diamond Hill Core Plus Bond Fund | Investor Class | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 61.70%
Diamond Hill Core Plus Bond Fund | Investor Class | Corporate Credit  
Holdings [Line Items]  
Percent of Net Asset Value 22.10%
Diamond Hill Core Plus Bond Fund | Investor Class | Treasury  
Holdings [Line Items]  
Percent of Net Asset Value 15.30%
Diamond Hill Core Plus Bond Fund | Investor Class | U.S. Treasury Bonds 3.000% 02/15/48  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Core Plus Bond Fund | Investor Class | U.S. Treasury Notes 4.000% 02/15/34  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Diamond Hill Core Plus Bond Fund | Investor Class | U.S. Treasury Notes 0.625% 08/15/30  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Diamond Hill Core Plus Bond Fund | Investor Class | U.S. Treasury Bonds 1.625% 11/15/50  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Diamond Hill Core Plus Bond Fund | Investor Class | GNMA, Series 2018-27, Class KY 3.5000% 02/20/48  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Core Plus Bond Fund | Investor Class | GNMA, Series 2021-29, Class AG 5.000% 02/20/51  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Core Plus Bond Fund | Investor Class | GNMA, Series 2020-95, Class EA 1.500% 07/20/50  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Diamond Hill Core Plus Bond Fund | Investor Class | GNMA, Series 2022-64, Class MA 2.500% 11/20/51  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Core Plus Bond Fund | Investor Class | GNMA, Series 2014-118, Class ZD 2.500% 08/16/44  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Core Plus Bond Fund | Investor Class | GNMA, Series 2021-136, Class TC 1.500% 08/20/51  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Core Plus Bond Fund | Class I | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Core Plus Bond Fund | Class I | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (1.80%)
Diamond Hill Core Plus Bond Fund | Class I | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 61.70%
Diamond Hill Core Plus Bond Fund | Class I | Corporate Credit  
Holdings [Line Items]  
Percent of Net Asset Value 22.10%
Diamond Hill Core Plus Bond Fund | Class I | Treasury  
Holdings [Line Items]  
Percent of Net Asset Value 15.30%
Diamond Hill Core Plus Bond Fund | Class I | U.S. Treasury Bonds 3.000% 02/15/48  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Core Plus Bond Fund | Class I | U.S. Treasury Notes 4.000% 02/15/34  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Diamond Hill Core Plus Bond Fund | Class I | U.S. Treasury Notes 0.625% 08/15/30  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Diamond Hill Core Plus Bond Fund | Class I | U.S. Treasury Bonds 1.625% 11/15/50  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Diamond Hill Core Plus Bond Fund | Class I | GNMA, Series 2018-27, Class KY 3.5000% 02/20/48  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Core Plus Bond Fund | Class I | GNMA, Series 2021-29, Class AG 5.000% 02/20/51  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Core Plus Bond Fund | Class I | GNMA, Series 2020-95, Class EA 1.500% 07/20/50  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Diamond Hill Core Plus Bond Fund | Class I | GNMA, Series 2022-64, Class MA 2.500% 11/20/51  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Core Plus Bond Fund | Class I | GNMA, Series 2014-118, Class ZD 2.500% 08/16/44  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Core Plus Bond Fund | Class I | GNMA, Series 2021-136, Class TC 1.500% 08/20/51  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Core Plus Bond Fund | Class Y | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Diamond Hill Core Plus Bond Fund | Class Y | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (1.80%)
Diamond Hill Core Plus Bond Fund | Class Y | Securitized  
Holdings [Line Items]  
Percent of Net Asset Value 61.70%
Diamond Hill Core Plus Bond Fund | Class Y | Corporate Credit  
Holdings [Line Items]  
Percent of Net Asset Value 22.10%
Diamond Hill Core Plus Bond Fund | Class Y | Treasury  
Holdings [Line Items]  
Percent of Net Asset Value 15.30%
Diamond Hill Core Plus Bond Fund | Class Y | U.S. Treasury Bonds 3.000% 02/15/48  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Core Plus Bond Fund | Class Y | U.S. Treasury Notes 4.000% 02/15/34  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Diamond Hill Core Plus Bond Fund | Class Y | U.S. Treasury Notes 0.625% 08/15/30  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Diamond Hill Core Plus Bond Fund | Class Y | U.S. Treasury Bonds 1.625% 11/15/50  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Diamond Hill Core Plus Bond Fund | Class Y | GNMA, Series 2018-27, Class KY 3.5000% 02/20/48  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Core Plus Bond Fund | Class Y | GNMA, Series 2021-29, Class AG 5.000% 02/20/51  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Diamond Hill Core Plus Bond Fund | Class Y | GNMA, Series 2020-95, Class EA 1.500% 07/20/50  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Diamond Hill Core Plus Bond Fund | Class Y | GNMA, Series 2022-64, Class MA 2.500% 11/20/51  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Core Plus Bond Fund | Class Y | GNMA, Series 2014-118, Class ZD 2.500% 08/16/44  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Core Plus Bond Fund | Class Y | GNMA, Series 2021-136, Class TC 1.500% 08/20/51  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Diamond Hill Large Cap Concentrated ETF Shares | Industrials  
Holdings [Line Items]  
Percent of Net Asset Value 14.60%
Diamond Hill Large Cap Concentrated ETF Shares | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 24.20%
Diamond Hill Large Cap Concentrated ETF Shares | Health Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
Diamond Hill Large Cap Concentrated ETF Shares | Real Estate [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Diamond Hill Large Cap Concentrated ETF Shares | Registered Investment Companies  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Diamond Hill Large Cap Concentrated ETF Shares | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
Diamond Hill Large Cap Concentrated ETF Shares | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Diamond Hill Large Cap Concentrated ETF Shares | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Diamond Hill Large Cap Concentrated ETF Shares | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Diamond Hill Large Cap Concentrated ETF Shares | Information Technology  
Holdings [Line Items]  
Percent of Net Asset Value 13.70%
Diamond Hill Large Cap Concentrated ETF Shares | Liabilities in Excess of Other Assets  
Holdings [Line Items]  
Percent of Net Asset Value (0.30%)
Diamond Hill Large Cap Concentrated ETF Shares | Communication Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Diamond Hill Large Cap Concentrated ETF Shares | American International Group, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Diamond Hill Large Cap Concentrated ETF Shares | Colgate-Palmolive Co.  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
Diamond Hill Large Cap Concentrated ETF Shares | Berkshire Hathaway, Inc., Class B  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Diamond Hill Large Cap Concentrated ETF Shares | Abbott Laboratories  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Diamond Hill Large Cap Concentrated ETF Shares | Aon plc, Class A  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Diamond Hill Large Cap Concentrated ETF Shares | Waste Management, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Diamond Hill Large Cap Concentrated ETF Shares | ConocoPhillips  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Diamond Hill Large Cap Concentrated ETF Shares | Texas Instruments, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Diamond Hill Large Cap Concentrated ETF Shares | Labcorp Holdings, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Diamond Hill Large Cap Concentrated ETF Shares | Union Pacific Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%