Diamond Hill Small Cap Fund | Investor Class Diamond Hill Small Cap Fund | Investor Class | Russell 3000 Index Diamond Hill Small Cap Fund | Investor Class | Russell 2000 Index Industrials Financials Health Care [Member] Real Estate [Member] Registered Investment Companies Consumer Staples Consumer Discretionary Materials Energy Utilities Information Technology Liabilities in Excess of Other Assets Investment Type [Axis] Astrana Health, Inc. Triumph Financial, Inc. Ducommun, Inc. Red Rock Resorts, Inc. Class A Ryman Hospitality Properties, Inc. UFP Technologies, Inc. Bank OZK Mesa Laboratories, Inc. Utz Brands, Inc. Magnolia Oil & Gas Corp., Class A Diamond Hill Small Cap Fund | Class I Diamond Hill Small Cap Fund | Class I | Russell 3000 Index Diamond Hill Small Cap Fund | Class I | Russell 2000 Index Diamond Hill Small Cap Fund | Class Y Diamond Hill Small Cap Fund | Class Y | Russell 3000 Index Diamond Hill Small Cap Fund | Class Y | Russell 2000 Index Diamond Hill Small-Mid Cap Fund | Investor Class Diamond Hill Small-Mid Cap Fund | Investor Class | Russell 3000 Index Diamond Hill Small-Mid Cap Fund | Investor Class | Russell 2500 Index Communication Services Humana, Inc. Regal Rexnord Corp. Antero Resources Corp. CubeSmart Post Holdings, Inc. Huntington Ingalls Industries, Inc. Fortune Brands Innovations, Inc. Illumina, Inc. TransUnion Diamond Hill Small-Mid Cap Fund | Class I Diamond Hill Small-Mid Cap Fund | Class I | Russell 3000 Index Diamond Hill Small-Mid Cap Fund | Class I | Russell 2500 Index Diamond Hill Small-Mid Cap Fund | Class Y Diamond Hill Small-Mid Cap Fund | Class Y | Russell 3000 Index Diamond Hill Small-Mid Cap Fund | Class Y | Russell 2500 Index Diamond Hill Mid Cap Fund | Investor Class Diamond Hill Mid Cap Fund | Investor Class | Russell 3000 Index Diamond Hill Mid Cap Fund | Investor Class | Russell Midcap Index American International Group, Inc. Diamondback Energy, Inc. Rocket Companies, Inc., Class A Diamond Hill Mid Cap Fund | Class I Diamond Hill Mid Cap Fund | Class I | Russell 3000 Index Diamond Hill Mid Cap Fund | Class I | Russell Midcap Index Diamond Hill Mid Cap Fund | Class Y Diamond Hill Mid Cap Fund | Class Y | Russell 3000 Index Diamond Hill Mid Cap Fund | Class Y | Russell Midcap Index Diamond Hill Large Cap Fund | Investor Class Diamond Hill Large Cap Fund | Investor Class | Russell 3000 Index Diamond Hill Large Cap Fund | Investor Class | Russell 1000 Value Index Diamond Hill Large Cap Fund | Investor Class | Russell 1000 Index Colgate-Palmolive Co. Berkshire Hathaway, Inc., Class B Abbott Laboratories Aon plc, Class A Waste Management, Inc. ConocoPhillips Capital One Financial Corp. Microsoft Corp. Walt Disney Co. (The) Diamond Hill Large Cap Fund | Class I Diamond Hill Large Cap Fund | Class I | Russell 3000 Index Diamond Hill Large Cap Fund | Class I | Russell 1000 Value Index Diamond Hill Large Cap Fund | Class I | Russell 1000 Index Diamond Hill Large Cap Fund | Class Y Diamond Hill Large Cap Fund | Class Y | Russell 3000 Index Diamond Hill Large Cap Fund | Class Y | Russell 1000 Value Index Diamond Hill Large Cap Fund | Class Y | Russell 1000 Index Diamond Hill Select Fund | Investor Class Diamond Hill Select Fund | Investor Class | Russell 3000 Index Cimpress plc Salesforce, Inc. Ashland, Inc. Adobe, Inc. Diamond Hill Select Fund | Class I Diamond Hill Select Fund | Class I Russell 3000 Index Diamond Hill Select Fund | Class Y Diamond Hill Select Fund | Class Y | Russell 3000 Index Diamond Hill Long-Short Fund | Investor Class Diamond Hill Long-Short Fund | Investor Class | Russell 3000 Index Diamond Hill Long-Short Fund | Investor Class | Russell 1000 Index Diamond Hill Long-Short Fund | Investor Class | 60% Russell 1000/40% Bloomberg US T-Bills 1-3 Month Index Short: Consumer Discretionary Short: Industrials Short: Information Technology Short: Financials Short: Real Estate Short: Health Care Short: Materials Short: Energy Short: Utilities Short: Consumer Staples Short: Segregated Cash with Custodian Short: Liabilities in Excess of Other Assets Taiwan Semiconductor Manufacturing Co. Ltd. - ADR Alphabet, Inc., Class A Meta Platforms, Inc., Class A SentinelOne, Inc., Class A Amazon.com, Inc. Citigroup, Inc. NewMarket Corp. Federal Signal Corp. Medpace Holdings, Inc. Acushnet Holdings Corp. Bank of Hawaii Corp. Blue Bird Corp. eBay, Inc. International Business Machines Corp. Matson, Inc. Williams Sonoma, Inc. Diamond Hill Long-Short Fund | Class I Diamond Hill Long-Short Fund | Class I | Russell 3000 Index Diamond Hill Long-Short Fund | Class I | Russell 1000 Index Diamond Hill Long-Short Fund | Class I | 60% Russell 1000/40% Bloomberg US T-Bills 1-3 Month Index Diamond Hill Long-Short Fund | Class Y Diamond Hill Long-Short Fund | Class Y | Russell 3000 Index Diamond Hill Long-Short Fund | Class Y | Russell 1000 Index Diamond Hill Long-Short Fund | Class Y | 60% Russell 1000/40% Bloomberg US T-Bills 1-3 Month Index Diamond Hill International Fund | Investor Class Diamond Hill International Fund | Investor Class | MSCI ACWI ex USA Index SK hynix, Inc. AIB Group plc Glencore plc British American Tobacco plc Samsung Electronics Co. Ltd. Singapore Exchange Ltd. Compagnie Financiere Richemont SA, Class A Veolia Environment SA Max Co. Ltd. Diamond Hill International Fund | Class I Diamond Hill International Fund | Class I | MSCI ACWI ex USA Index Diamond Hill International Fund | Class Y Diamond Hill International Fund | Class Y | MSCI ACWI ex USA Index Diamond Hill Short Duration Securitized Bond Fund | Investor Class Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Bloomberg US Aggregate Bond Index Diamond Hill Short Duration Securitized Bond Fund | Investor Class | Bloomberg 1-3 Year US Government/Credit Index Securitized Corporate Credit Treasury Other Assets in Excess of Liabilities US Bank NA, Series 2026-SUP1, Class B1 5.500% 06/27/33 U.S. Treasury Notes 3.625% 05/31/28 MultiFamily Structured Credit Risk, Series 2021-MN2 8.685% 07/25/41 U.S. Treasury Notes 2.250% 08/15/27 GPCC Amortizing Receivables, Series 2026-1A, Class A 5.960% 06/16/36 Life Financial Services Trust, Series 2022-BBMR2, Class A1 5.692% 05/15/39 HTAP Trust, Series 2024-2, Class A 6.500% 04/25/42 FNMA, Pool #MA6009 5.500% 03/01/46 GPCC Amortizing Receivables, Series 2026-1A, Class D 9.260% 06/16/36 U.S. Treasury Notes 1.250% 09/30/28 Diamond Hill Short Duration Securitized Bond Fund | Class I Diamond Hill Short Duration Securitized Bond Fund | Class I | Bloomberg US Aggregate Bond Index Diamond Hill Short Duration Securitized Bond Fund | Class I | Bloomberg 1-3 Year US Government/Credit Index Diamond Hill Short Duration Securitized Bond Fund | Class Y Diamond Hill Short Duration Securitized Bond Fund | Class Y | Bloomberg US Aggregate Bond Index Diamond Hill Short Duration Securitized Bond Fund | Class Y | Bloomberg 1-3 Year US Government/Credit Index Diamond Hill Securitized Total Return Fund | Investor Class Diamond Hill Securitized Total Return Fund | Investor Class | Bloomberg US Aggregate Bond Index Diamond Hill Securitized Total Return Fund | Investor Class | Bloomber US Securitized: MBS, ABS and CMBS Index FNMA, Series 2018-95, Class B 3.500% 01/25/49 FNMA, Series 2017-87, Class EA 3.000% 04/25/44 FNMA, Series 2012-103, Class ZP 3.000% 09/25/42 FHLMC, Series 4425, Class TA 2.000% 01/15/45 GNMA, Series 2009-54, Class Z 6.000% 07/16/39 FNMA, Series 2020-44, Class EG 2.000% 09/25/42 RMF Buyout Issuance Trust 4.704% 11/25/31 FHLMC, Series 4152, Class GW 2.500% 01/15/43 GNMA, Series 2011-7, Class LS (IO) 2.183% 12/20/40 FHLMC, Series 5071, Class ZT 1.500% 02/25/51 Diamond Hill Securitized Total Return Fund | Class I Diamond Hill Securitized Total Return Fund | Class I | Bloomberg US Aggregate Bond Index Diamond Hill Securitized Total Return Fund | Class I | Bloomber US Securitized: MBS, ABS and CMBS Index Diamond Hill Securitized Total Return Fund | Class Y Diamond Hill Securitized Total Return Fund | Class Y | Bloomberg US Aggregate Bond Index Diamond Hill Securitized Total Return Fund | Class Y | Bloomber US Securitized: MBS, ABS and CMBS Index Diamond Hill Core Bond Fund | Investor Class Diamond Hill Core Bond Fund | Investor Class | Bloomberg US Aggregate Bond Index Government Related U.S. Treasury Bonds 3.000% 02/15/48 U.S. Treasury Notes 4.000% 02/15/34 U.S. Treasury Notes 0.625% 08/15/30 U.S. Treasury Bonds 1.625% 11/15/50 U.S. Treasury Bonds 2.250% 08/15/46 U.S. Treasury Bonds 1.125% 08/15/40 U.S. Treasury STRIPS 0.000% 11/15/38 U.S. Treasury STRIPS 0.625% 02/15/43 U.S. Treasury Bonds 1.375% 11/15/40 Diamond Hill Core Bond Fund | Class I Diamond Hill Core Bond Fund | Class I | Bloomberg US Aggregate Bond Index Diamond Hill Core Bond Fund | Class Y Diamond Hill Core Bond Fund | Class Y | Bloomberg US Aggregate Bond Index Diamond Hill Core Plus Bond Fund | Investor Class Diamond Hill Core Plus Bond Fund | Investor Class | Bloomberg US Aggregate Bond Index GNMA, Series 2018-27, Class KY 3.5000% 02/20/48 GNMA, Series 2021-29, Class AG 5.000% 02/20/51 GNMA, Series 2020-95, Class EA 1.500% 07/20/50 GNMA, Series 2022-64, Class MA 2.500% 11/20/51 GNMA, Series 2014-118, Class ZD 2.500% 08/16/44 GNMA, Series 2021-136, Class TC 1.500% 08/20/51 Diamond Hill Core Plus Bond Fund | Class I Diamond Hill Core Plus Bond Fund | Class I | Bloomberg US Aggregate Bond Index Diamond Hill Core Plus Bond Fund | Class Y Diamond Hill Core Plus Bond Fund | Class Y | Bloomberg US Aggregate Bond Index Diamond Hill Large Cap Concentrated ETF Shares Diamond Hill Large Cap Concentrated ETF Shares | Russell 3000 Index Diamond Hill Large Cap Concentrated ETF Shares | Russell 1000 Value Index Diamond Hill Large Cap Concentrated ETF Shares | Russell 1000 Index Texas Instruments, Inc. Labcorp Holdings, Inc. Union Pacific Corp. Net Assets Investment Company, Portfolio Turnover