Shareholder Report |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2026
USD ($)
shares
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| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Document Type | N-CSRS | ||||||||||||||||||||||||||||||||||||||||||||||
| Amendment Flag | false | ||||||||||||||||||||||||||||||||||||||||||||||
| Registrant Name | Diamond Hill Funds | ||||||||||||||||||||||||||||||||||||||||||||||
| Entity Central Index Key | 0001032423 | ||||||||||||||||||||||||||||||||||||||||||||||
| Entity Investment Company Type | N-1A | ||||||||||||||||||||||||||||||||||||||||||||||
| Document Period End Date | Jun. 30, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Small Cap Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Small Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHSCX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This contains important information about Diamond Hill Small Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
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| Expenses Paid, Amount | $ 72 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.28% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHSCX) returned 27.99% for the 6-month period ended June 30, 2026. Over that same period, the Russell 2000 Index returned 22.57%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
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| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 307,675,717 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 60 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,027,131 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 7.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Small Cap Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Small Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHSIX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Small Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
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| Expenses Paid, Amount | $ 56 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.99% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHSIX) returned 28.19% for the 6-month period ended June 30, 2026. Over that same period, the Russell 2000 Index returned 22.57%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 307,675,717 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 60 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,027,131 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 7.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Small Cap Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Small Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHSYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Small Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 49 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.86% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHSYX) returned 28.28% for the 6-month period ended June 30, 2026. Over that same period, the Russell 2000 Index returned 22.57%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 307,675,717 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 60 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,027,131 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 7.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Small-Mid Cap Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Small-Mid Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHMAX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Small-Mid Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 65 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.27% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHMAX) returned 6.66% for the 6-month period ended June 30, 2026. Over that same period, the Russell 2500 Index returned 22.71%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 629,616,873 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 61 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,920,738 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 33.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
||||||||||||||||||||||||||||||||||||||||||||||
| Largest Holdings [Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Small-Mid Cap Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Small-Mid Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHMIX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Small-Mid Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 50 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.98% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHMIX) returned 6.83% for the 6-month period ended June 30, 2026. Over that same period, the Russell 2500 Index returned 22.71%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 629,616,873 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 61 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,920,738 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 33.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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|
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Small-Mid Cap Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Small-Mid Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHMYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Small-Mid Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 44 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.85% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHMYX) returned 6.91% for the 6-month period ended June 30, 2026. Over that same period, the Russell 2500 Index returned 22.71%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 629,616,873 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 61 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,920,738 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 33.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Mid Cap Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Mid Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHPAX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Mid Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 56 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.10% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHPAX) returned 4.94% for the 6-month period ended June 30, 2026. Over that same period, the Russell Midcap Index returned 15.30%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 73,562,448 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 59 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 224,043 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 18.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Mid Cap Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Mid Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHPIX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Mid Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 41 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.81% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHPIX) returned 5.14% for the 6-month period ended June 30, 2026. Over that same period, the Russell Midcap Index returned 15.30%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 73,562,448 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 59 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 224,043 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 18.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Mid Cap Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Mid Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHPYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Mid Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
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| Expenses Paid, Amount | $ 35 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.68% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHPYX) returned 5.18% for the 6-month period ended June 30, 2026. Over that same period, the Russell Midcap Index returned 15.30%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 73,562,448 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 59 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 224,043 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 18.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Large Cap Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Large Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHLAX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Large Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 51 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.02% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHLAX) returned 0.72% for the 6-month period ended June 30, 2026. Over that same period, the Russell 1000 Value Index returned 16.26%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 2,881,080,015 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 51 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 10,540,170 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 16.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Large Cap Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Large Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHLRX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Large Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 36 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.73% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHLRX) returned 0.84% for the 6-month period ended June 30, 2026. Over that same period, the Russell 1000 Value Index returned 16.26%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 2,881,080,015 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 51 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 10,540,170 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 16.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Large Cap Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Large Cap Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHLYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Large Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 30 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.60% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHLYX) returned 0.93% for the 6-month period ended June 30, 2026. Over that same period, the Russell 1000 Value Index returned 16.26%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 2,881,080,015 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 51 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 10,540,170 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 16.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Select Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Select Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHTAX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Select Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
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| Expenses Paid, Amount | $ 61 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.20% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHTAX) returned 4.36% for the 6-month period ended June 30, 2026. Over that same period, the Russell 3000 Index returned 10.88%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 543,603,090 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 28 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,990,120 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 24.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Select Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Select Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHLTX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Select Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 46 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.91% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHLTX) returned 4.52% for the 6-month period ended June 30, 2026. Over that same period, the Russell 3000 Index returned 10.88%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 543,603,090 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 28 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,990,120 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 24.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Select Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Select Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHTYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Select Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 40 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.78% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHTYX) returned 4.45% for the 6-month period ended June 30, 2026. Over that same period, the Russell 3000 Index returned 10.88%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 543,603,090 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 28 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,990,120 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 24.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Long-Short Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Long-Short Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DIAMX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Long-Short Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 90 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.88% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DIAMX) returned -7.16% for the 6-month period ended June 30, 2026. Over that same period, the Russell 1000 Index returned 10.33% and the 60%/40% Blended Index returned 7.02%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 2,110,953,007 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 91 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 10,009,260 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 24.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
Long Portfolio
![]() Short Portfolio
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Long-Short Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Long-Short Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHLSX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Long-Short Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 76 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.59% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHLSX) returned -7.04% for the 6-month period ended June 30, 2026. Over that same period, the Russell 1000 Index returned 10.33% and the 60%/40% Blended Index returned 7.02%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 2,110,953,007 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 91 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 10,009,260 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 24.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
Long Portfolio
![]() Short Portfolio
![]()
|
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Long-Short Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Long-Short Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DIAYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Long-Short Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 70 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.46% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DIAYX) returned -6.99% for the 6-month period ended June 30, 2026. Over that same period, the Russell 1000 Index returned 10.33% and the 60%/40% Blended Index returned 7.02%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 2,110,953,007 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 91 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 10,009,260 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 24.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
Long Portfolio
![]() Short Portfolio
![]()
|
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill International Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill International Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHIAX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill International Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 61 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.17% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHIAX) returned 11.36% for the 6-month period ended June 30, 2026. Over that same period, the MSCI ACWI ex USA Index returned 13.68%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| Performance Inception Date | Dec. 30, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 170,926,820 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 51 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 555,396 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 18.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. On August 6, 2026, the Board approved a plan of liquidation for the Fund. The Fund closed to new investors effective August 7, 2026 and will close to subsequent investments by existing shareholders effective September 8, 2026. The Fund will liquidate on or about September 10, 2026. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill International Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill International Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHIIX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill International Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 46 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.88% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHIIX) returned 11.52% for the 6-month period ended June 30, 2026. Over that same period, the MSCI ACWI ex USA Index returned 13.68%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Inception Date | Dec. 30, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 170,926,820 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 51 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 555,396 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 18.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. On August 6, 2026, the Board approved a plan of liquidation for the Fund. The Fund closed to new investors effective August 7, 2026 and will close to subsequent investments by existing shareholders effective September 8, 2026. The Fund will liquidate on or about September 10, 2026. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill International Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill International Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHIYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill International Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
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| Expenses Paid, Amount | $ 39 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.75% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHIYX) returned 11.59% for the 6-month period ended June 30, 2026. Over that same period, the MSCI ACWI ex USA Index returned 13.68%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| Performance Inception Date | Dec. 30, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 170,926,820 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 51 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 555,396 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 18.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. On August 6, 2026, the Board approved a plan of liquidation for the Fund. The Fund closed to new investors effective August 7, 2026 and will close to subsequent investments by existing shareholders effective September 8, 2026. The Fund will liquidate on or about September 10, 2026. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Short Duration Securitized Bond Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Short Duration Securitized Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHEAX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Short Duration Securitized Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 41 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.82% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHEAX) returned 1.99% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg 1-3 Year US Government/Credit Index returned 0.77%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the asset-backed securities (ABS), non-agency mortgage-backed securities (MBS) and non-agency commercial mortgage-backed securities (CMBS) sectors. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| Performance Inception Date | Jul. 05, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 5,570,673,729 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 624 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 8,990,111 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 26.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. Effective on or about October 30, 2026, the Fund is expected to change its principal investment strategy to, among other things, remove the requirement to invest a minimum percentage of the Fund's assets in securitized bond investments, and be renamed the Diamond Hill Short Duration Income Fund. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Short Duration Securitized Bond Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Short Duration Securitized Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHEIX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Short Duration Securitized Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 27 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.53% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHEIX) returned 2.04% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg 1-3 Year US Government/Credit Index returned 0.77%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the asset-backed securities (ABS), non-agency mortgage-backed securities (MBS) and non-agency commercial mortgage-backed securities (CMBS) sectors. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Inception Date | Jul. 05, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 5,570,673,729 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 624 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 8,990,111 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 26.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. Effective on or about October 30, 2026, the Fund is expected to change its principal investment strategy to, among other things, remove the requirement to invest a minimum percentage of the Fund's assets in securitized bond investments, and be renamed the Diamond Hill Short Duration Income Fund. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Short Duration Securitized Bond Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Short Duration Securitized Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHEYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Short Duration Securitized Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 20 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.40% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHEYX) returned 2.20% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg 1-3 Year US Government/Credit Index returned 0.77%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the asset-backed securities (ABS), non-agency mortgage-backed securities (MBS) and non-agency commercial mortgage-backed securities (CMBS) sectors. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Inception Date | Jul. 05, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 5,570,673,729 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 624 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 8,990,111 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 26.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. Effective on or about October 30, 2026, the Fund is expected to change its principal investment strategy to, among other things, remove the requirement to invest a minimum percentage of the Fund's assets in securitized bond investments, and be renamed the Diamond Hill Short Duration Income Fund. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Securitized Total Return Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Securitized Total Return Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHWAX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Securitized Total Return Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 58 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 1.17% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHWAX) returned 0.76% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg US Securitized: MBS, ABS and CMBS Index returned 0.98%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the agency and non-agency mortgage-backed securities (MBS) sectors. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| Performance Inception Date | Jun. 30, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 31,973,423 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 134 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 110,910 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 10.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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|
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| Largest Holdings [Text Block] |
|
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Securitized Total Return Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Securitized Total Return Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHWIX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Securitized Total Return Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 44 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.88% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHWIX) returned 0.94% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg US Securitized: MBS, ABS and CMBS Index returned 0.98%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the agency and non-agency mortgage-backed securities (MBS) sectors. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Inception Date | Jun. 30, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 31,973,423 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 134 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 110,910 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 10.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Securitized Total Return Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Securitized Total Return Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHWYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Securitized Total Return Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 37 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.75% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHWYX) returned 1.00% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg US Securitized: MBS, ABS and CMBS Index returned 0.98%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the agency and non-agency mortgage-backed securities (MBS) sectors. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Inception Date | Jun. 30, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 31,973,423 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 134 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 110,910 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 10.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Core Bond Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Core Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHRAX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Core Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 38 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.77% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHRAX) returned 0.88% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg US Aggregate Bond Index returned 0.62%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the agency mortgage-backed securities (MBS), non-agency mortgage-backed securities (MBS) and asset-backed securities (ABS). ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| Performance Inception Date | Jul. 05, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 3,250,126,430 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 1,086 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 4,758,980 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 11.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Core Bond Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Core Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHRIX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Core Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
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| Expenses Paid, Amount | $ 24 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.48% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHRIX) returned 1.06% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg US Aggregate Bond Index returned 0.62%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the agency mortgage-backed securities (MBS), non-agency mortgage-backed securities (MBS) and asset-backed securities (ABS). ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Inception Date | Jul. 05, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 3,250,126,430 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 1,086 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 4,758,980 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 11.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Core Bond Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Core Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHRYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Core Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 17 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.35% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHRYX) returned 1.13% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg US Aggregate Bond Index returned 0.62%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the agency mortgage-backed securities (MBS), non-agency mortgage-backed securities (MBS) and asset-backed securities (ABS). ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Inception Date | Jul. 05, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 3,250,126,430 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 1,086 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 4,758,980 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 11.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Core Plus Bond Fund | Investor Class | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Core Plus Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Investor | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHNAX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Core Plus Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 43 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.87% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHNAX) returned 1.18% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg US Aggregate Bond Index returned 0.62%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the corporate credit, asset-backed securities (ABS) and agency mortgage-backed securities (MBS) sectors. ![]() |
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
||||||||||||||||||||||||||||||||||||||||||||||
| Performance Inception Date | Oct. 15, 2024 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 100,382,766 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 489 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 190,963 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 23.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
||||||||||||||||||||||||||||||||||||||||||||||
| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Core Plus Bond Fund | Class I | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Core Plus Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHNIX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Core Plus Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
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| Expenses Paid, Amount | $ 29 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.58% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHNIX) returned 1.25% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg US Aggregate Bond Index returned 0.62%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the corporate credit, asset-backed securities (ABS) and agency mortgage-backed securities (MBS) sectors. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
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| Performance Inception Date | Oct. 15, 2024 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 100,382,766 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 489 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 190,963 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 23.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Core Plus Bond Fund | Class Y | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Core Plus Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Class Y | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHNYX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Core Plus Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
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| Expenses Paid, Amount | $ 22 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.45% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHNYX) returned 1.32% for the 6-month period ended June 30, 2026. Over that same period, the Bloomberg US Aggregate Bond Index returned 0.62%. All sectors contributed positively to the Fund's performance over the period, with particular strength in the corporate credit, asset-backed securities (ABS) and agency mortgage-backed securities (MBS) sectors. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
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| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| Performance Inception Date | Oct. 15, 2024 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 100,382,766 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 489 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 190,963 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 23.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
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| Largest Holdings [Text Block] |
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Diamond Hill Large Cap Concentrated ETF Shares | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | Diamond Hill Large Cap Concentrated ETF | ||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | Diamond Hill Large Cap Concentrated ETF | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | DHLX | ||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diamond Hill Large Cap Concentrated ETF (the "Fund") for the period of January 1, 2026 to June 30, 2026. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://diamond-hill.com/documents. You can also request this information by contacting us at 888-226-5595 or info@diamond-hill.com or by contacting your financial advisor. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes material changes to the Fund that occurred during the reporting period. | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Email | info@diamond-hill.com | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | https://diamond-hill.com/documents | ||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund's costs for the last six months?
(Based On a Hypothetical $10,000 Investment)
|
||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 27 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.55% | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform the last six months, and what affected its performance?
The Fund (Ticker: DHLX) returned -1.67% for the 6-month period ended June 30, 2026. Over that same period, the Russell 1000 Value Index returned 16.26%. Security selection is the primary driver of the Fund's performance during any given period — the top and bottom contributors to return are illustrated in the chart. ![]() |
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| Performance Past Does Not Indicate Future [Text] | Past performance is not indicative of future results. | ||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Return [Table Text Block] |
Average Annual Total Returns as of June 30, 2026
|
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| Performance Inception Date | Feb. 26, 2021 | ||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The performance of the above Fund does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Apr. 22, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 87,093,636 | ||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | shares | 21 | ||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 190,517 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company, Portfolio Turnover | 9.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
|
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| Holdings [Text Block] |
What Did the Fund Invest In?
Sector Allocation (% of Net Assets)
![]()
|
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| Largest Holdings [Text Block] |
|
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| Material Fund Change [Text Block] |
Material Fund Changes
This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. At special meetings of shareholders of the Diamond Hill Funds (the "Trust") held on April 17, 2026 and April 21, 2026, shareholders approved a new investment management agreement and elected nine new Trustees to serve as the Board of Trustees of the Trust (the "Board"). The newly elected Trustees began serving and the new investment management agreement, which is substantially similar to the prior agreement, became effective as of the Transaction closing and provides for continuation of the Fund's investment program without interruption. |
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| Material Fund Change Adviser [Text Block] | On April 22, 2026, First Eagle Investment Management, LLC ("First Eagle") acquired Diamond Hill Investment Group, Inc. ("DHIG"), the parent company of Diamond Hill Capital Management, Inc. (the "Adviser"), the investment adviser to the Fund (the "Transaction"). The Adviser, now operating as a wholly-owned subsidiary of DHIG, which in turn, is a wholly-owned subsidiary of First Eagle, continues to provide investment advisory services as the investment adviser to the Fund without interruption. The Transaction is not expected to result in any change of the portfolio management of the Fund or in the Fund's investment objectives or policies. | ||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since April 22, 2026. For more complete information, you may review the Fund's prospectus dated February 28, 2026, as supplemented, at https://www.diamond-hill.com/documents or upon request at 888-226-5595. | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Phone Number | 888-226-5595 | ||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | https://www.diamond-hill.com/documents |