Touchstone Small Cap Value Fund Fees and Expenses - Touchstone Small Cap Value Fund	Sep. 30, 2025 USD ($)
Prospectus [Line Items]
Expense Heading [Optional Text]	<span style="color:#000000;font-family:Arial Narrow;font-size:12pt;font-weight:bold;text-decoration:underline;">The Fund’s Fees and Expenses</span>
Expense Narrative [Text Block]	This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.You may qualify for sales charge discounts for Class A shares of Touchstone equity funds and Touchstone fixed income funds if you and your family invest, or agree to invest in the future, at least $25,000 or $50,000, respectively, in Touchstone funds. More information about these and other discounts is available from your financial professional, in the section titled “Choosing a Class of Shares” in the Fund’s prospectus and Statement of Additional Information on pages 21 and 39, respectively, and in Appendix A–Intermediary-Specific Sales Charge Waivers and Discounts to the Fund's prospectus. An investor transacting in Class R6 shares, which do not have any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution, may be required to pay a commission to a broker for effecting such transactions on an agency basis. Such commissions are not reflected in the table or in the “Example” below.
Expense Breakpoint Discounts [Text]	<span style="color:#000000;font-family:Times New Roman;font-size:10pt;">You </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">may qualify for sales charge discounts for Class A shares of Touchstone equity funds and Touchstone fixed income funds if you and your family invest, or agree to invest in the future, at least $25,000 or </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">$50,000</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">, respectively, in Touchstone funds.</span>
Expenses Restated to Reflect Current [Text]	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;font-style:italic;">Management Fees have been restated to reflect contractual changes to the Fund's Investment Advisory Agreement effective June 1, 2025.</span>
Expense Breakpoint, Minimum Investment Required [Amount]	$ 50,000
Other Expenses, New Fund, Based on Estimates [Text]	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;font-style:italic;">Other Expenses for Class R6 shares are estimated based on fees and expenses incurred by Institutional Class shares of the Fund and expenses of similar Touchstone Funds. Class R6 shares commenced operations on July 27, 2026.</span>
Shareholder Fees Caption [Optional Text]	<span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;margin-left:0.0pt;">Shareholder Fees (fees paid directly from </span><span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;margin-left:10pt;">your investment)</span>
Operating Expenses Caption [Optional Text]	<span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;margin-left:0.0pt;">Annual Fund Operating Expenses </span><span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;margin-left:10pt;">(expenses that you pay each year as a </span><span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;margin-left:10pt;">percentage of the value of your </span><span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;margin-left:10pt;">investment)</span>
Expense Example [Heading]	<span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">Example.</span>
Expense Example Narrative [Text Block]	This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then, except as indicated, redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year, that the Fund’s operating expenses remain the same and that all fee waivers or expense limits for the Fund will expire after one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text]	<span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;">Assuming Redemption at End of Period</span>
Expense Example, No Redemption, By Year, Caption [Text]	<span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;">Assuming</span><span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;">No Redemption</span>
Portfolio Turnover [Heading]	<span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">Portfolio Turnover.</span>
Portfolio Turnover [Text Block]	The Fund pays transaction costs, such as brokerage commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in total annual Fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 19% of the average value of the Fund’s portfolio.
Portfolio Turnover, Rate	19.00%

Touchstone Small Cap Value Fund Fees and Expenses - Touchstone Small Cap Value Fund

Sep. 30, 2025

USD ($)

The Fund’s Fees and Expenses

Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.You may qualify for sales charge discounts for Class A shares of Touchstone equity funds and Touchstone fixed income funds if you and your family invest, or agree to invest in the future, at least $25,000 or $50,000, respectively, in Touchstone funds. More information about these and other discounts is available from your financial professional, in the section titled “Choosing a Class of Shares” in the Fund’s prospectus and Statement of Additional Information on pages 21 and 39, respectively, and in Appendix A–Intermediary-Specific Sales Charge Waivers and Discounts to the Fund's prospectus. An investor transacting in Class R6 shares, which do not have any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution, may be required to pay a commission to a broker for effecting such transactions on an agency basis. Such commissions are not reflected in the table or in the “Example” below.

Expense Breakpoint Discounts [Text]

You may qualify for sales charge discounts for Class A shares of Touchstone equity funds and Touchstone fixed income funds if you and your family invest, or agree to invest in the future, at least $25,000 or $50,000, respectively, in Touchstone funds.

Expenses Restated to Reflect Current [Text]

Management Fees have been restated to reflect contractual changes to the Fund's Investment Advisory Agreement effective June 1, 2025.

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

Other Expenses for Class R6 shares are estimated based on fees and expenses incurred by Institutional Class shares of the Fund and expenses of similar Touchstone Funds. Class R6 shares commenced operations on July 27, 2026.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Optional Text]

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Expense Example [Heading]

Example.

Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then, except as indicated, redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year, that the Fund’s operating expenses remain the same and that all fee waivers or expense limits for the Fund will expire after one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example by, Year, Caption [Text]

Assuming Redemption at End of Period

Expense Example, No Redemption, By Year, Caption [Text]

AssumingNo Redemption

Portfolio Turnover [Heading]

Portfolio Turnover.

Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as brokerage commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in total annual Fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 19% of the average value of the Fund’s portfolio.

Portfolio Turnover, Rate

19.00%