Touchstone Sands Capital Emerging Markets Growth Fund Performance Management - Touchstone Sands Capital Emerging Markets Growth Fund |
Mar. 31, 2026 |
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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 World ex US Large & Mid Cap Index and MSCI Emerging Markets Index. The Bloomberg Emerging Markets Large & Mid Cap Index shows how the Fund’s performance compares against the returns of an index 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="font-family:Times New Roman;font-size:10pt;">Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in </span><span style="font-family:Times New Roman;font-size:10pt;margin-left:0%;">the future.</span> |
| Performance Information Illustrates Variability of Returns [Text] | <span style="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 </span><span style="font-family:Times New Roman;font-size:10pt;">Bloomberg World ex US Large & Mid Cap Index and MSCI Emerging Markets Index. The </span><span style="font-family:Times New Roman;font-size:10pt;margin-left:0%;">Bloomberg Emerging Markets Large & Mid Cap Index shows how the Fund’s performance compares against the returns of an index with similar investment objectives.</span> |
| Bar Chart Does Not Reflect Sales Loads [Text] | <span style="font-family:Times New Roman;font-size:10pt;">The bar chart does not reflect any sales charges, which would reduce your return.</span> |
| Bar Chart [Heading] | <span style="font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Touchstone Sands Capital Emerging Markets Growth Fund — Class Y Shares Total Return as of December 31</span> |
| Bar Chart Closing [Text Block] | Best Quarter:2nd Quarter 202034.36Worst Quarter:1st Quarter 2020(20.53)Year-To-Date:6/30/202623.84 |
| Performance Table Heading | <span style="font-family:Arial Narrow;font-size:10.02pt;font-weight:bold;margin-left:0.0pt;">Average Annual Total Returns</span><span style="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 Y shares only. The after-tax returns for other classes of shares offered by the Fund will differ from the Class Y 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.The inception dates of Class A shares, Class C shares and Class R6 shares were November 16, 2018, November 16, 2018 and April 26, 2021, respectively. Class A shares’ performance and Class C shares’ performance was calculated using the historical performance of Institutional Class shares for the periods prior to November 16, 2018. Class R6 shares’ performance was calculated using the historical performance of Institutional Class shares for the periods prior to April 26, 2021. Performance for these periods has been restated to reflect the impact of the fees and expenses applicable to Class A, Class C and Class R6 shares. |
| Performance Table Does Reflect Sales Loads | <span style="font-family:Times New Roman;font-size:10pt;">The performance table </span><span style="font-family:Times New Roman;font-size:10pt;margin-left:0%;">reflects any applicable sales charges.</span> |
| Performance Table Market Index Changed | <span style="font-family:Times New Roman;font-size:9pt;font-style:italic;">The Fund changed its broad-based securities market index to the Bloomberg World ex US Large & Mid Cap Index which is similarly representative of the overall securities market applicable to the Fund.</span><span style="font-family:Times New Roman;font-size:9pt;font-style:italic;">The Fund changed its additional index to the Bloomberg Emerging Markets Large & Mid Cap 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 Y 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 Y shares’ after-tax returns. </span> |
| Performance Availability Website Address [Text] | <span style="font-family:Times New Roman;font-size:10pt;">TouchstoneInvestments.com</span> |
| Performance Availability Phone [Text] | <span style="font-family:Times New Roman;font-size:10pt;">1.800.543.0407</span> |
| Class Y | |
| Prospectus [Line Items] | |
| Year to Date Return, Label [Optional Text] | <span style="font-family:Arial Narrow;font-size:10.02pt;">Year-To-Date:</span> |
| Bar Chart, Year to Date Return | 23.84% |
| Bar Chart, Year to Date Return, Date | Jun. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | <span style="font-family:Arial Narrow;font-size:10.02pt;">Best Quarter:</span> |
| Highest Quarterly Return | 34.36% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="font-family:Arial Narrow;font-size:10.02pt;">Worst Quarter:</span> |
| Lowest Quarterly Return | (20.53%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |