Touchstone Small Cap Fund Performance Management - Touchstone Small Cap Fund |
Sep. 30, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="color:#000000;font-family:Arial Narrow;font-size:12pt;font-weight:bold;text-decoration:underline;">The Fund’s Performance</span> |
| Performance Narrative [Text Block] | The bar chart and performance table below illustrate some indication of the risks and volatility of an investment in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and by showing how the Fund’s average annual total returns for one year, five years, and ten years compare with the Bloomberg US 3000 Index and the Russell 3000® Index. The Bloomberg US 2000 Index and the Russell 2000® Index show how the Fund’s performance compares against the returns of indexes with similar investment objectives. The bar chart does not reflect any sales charges, which would reduce your return.The performance table reflects any applicable sales charges.Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. More recent performance information is available at no cost by visiting TouchstoneInvestments.com or by calling 1.800.543.0407. |
| Performance Past Does Not Indicate Future [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.</span> |
| Performance Information Illustrates Variability of Returns [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">The bar chart and performance table below illustrate some indication of the risks and volatility of an investment in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and by showing how the Fund’s average annual total returns for one year, five years, and ten years compare with the Bloomberg US 3000 Index and the Russell 3000</span><span style="color:#000000;font-family:Times New Roman;font-size:6.5pt;position:relative;top:-4.25pt;">®</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> Index. The Bloomberg US 2000 Index </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">and the Russell 2000</span><span style="color:#000000;font-family:Times New Roman;font-size:6.5pt;position:relative;top:-4.25pt;">®</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> Index show how the Fund’s performance compares against the returns of indexes with similar investment objectives. </span> |
| Performance One Year or Less [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">Class R6 shares commenced operations on July 27, 2026 and do not have a full calendar year of performance.</span> |
| Bar Chart Does Not Reflect Sales Loads [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">The bar chart does not reflect any sales charges, which would reduce your return.</span> |
| Bar Chart [Heading] | <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Touchstone Small Cap Fund — Class A Shares Total Return as of December 31</span> |
| Bar Chart Closing [Text Block] | Best Quarter:4th Quarter 202026.05Worst Quarter:1st Quarter 2020(28.14) |
| Performance Table Heading | <span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;margin-left:0.0pt;">Average Annual Total Returns</span><span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;margin-left:0.0pt;">For the periods ended December 31, 2025</span> |
| Performance Table Narrative | After-tax returns are calculated using the highest individual marginal federal income tax rates in effect on a given distribution reinvestment date and do not reflect the impact of state and local taxes. Your actual after-tax returns may differ from those shown and depend on your tax situation. The after-tax returns do not apply to shares held in an individual retirement account (“IRA”), 401(k), or other tax-advantaged account.The after-tax returns shown in the table are for Class A shares only. The after-tax returns for other classes of shares offered by the Fund will differ from the Class A shares’ after-tax returns. The Return After Taxes on Distributions and Sale of Fund Shares may be greater than other returns for the same period due to a tax benefit of realizing a capital loss on the sale of Fund shares.Class R6 shares commenced operations on July 27, 2026 and do not have a full calendar year of performance. Class R6 shares would have had substantially similar annual returns to Class A, Class C, Class Y and Institutional Class shares because the shares are invested in the same portfolio of securities and the annual returns differ only to the extent that the share classes do not have the same shareholder fees and operating expenses. |
| Performance Table Does Reflect Sales Loads | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">The performance table reflects any applicable sales </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">charges.</span> |
| Performance Table Market Index Changed | <span style="color:#000000;font-family:Times New Roman;font-size:9pt;font-style:italic;">The Fund changed its broad-based securities index to the Bloomberg US 3000 Index which is similarly representative of the overall securities market applicable to the Fund.</span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;font-style:italic;">The Fund changed its additional index to the Bloomberg US 2000 Index which has similar investment objectives to the Fund.</span> |
| Performance Table Uses Highest Federal Rate | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">After-tax returns are calculated using the highest individual marginal federal income tax rates in effect on a given distribution reinvestment date and do not reflect the impact of state and local taxes.</span> |
| Performance Table Not Relevant to Tax Deferred | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">The after-tax returns do not apply to shares held in an individual retirement account (“IRA”), 401(k), or other tax-advantaged </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">account.</span> |
| Performance Table Explanation after Tax Higher | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">The Return After Taxes on Distributions and Sale of Fund Shares may be greater than other returns for the same period due to a tax benefit of realizing a capital loss on the sale of Fund shares.</span> |
| Performance Table One Class of after Tax Shown [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">The after-tax returns shown in the table are for Class A shares only. The after-tax returns for other classes of shares offered by the </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">Fund will differ from the Class A shares’ after-tax returns. </span> |
| Performance Availability Website Address [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">TouchstoneInvestments.com</span> |
| Performance Availability Phone [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">1.800.543.0407</span> |
| Class A | |
| Prospectus [Line Items] | |
| Highest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;">Best Quarter:</span> |
| Highest Quarterly Return | 26.05% |
| Highest Quarterly Return, Date | Dec. 31, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:10.02pt;">Worst Quarter:</span> |
| Lowest Quarterly Return | (28.14%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |