Harbor Active Small Cap ETF Performance Management - Harbor Active Small Cap ETF |
Oct. 31, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="color:#004DD6;font-family:Arial Narrow;font-size:14pt;font-weight:bold;">Performance</span> |
| Performance Narrative [Text Block] | The following bar chart and tables are intended to help you understand the risks and potential rewards of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table shows how the Fund’s average annual total returns compare to the returns of the Fund’s benchmark index, which includes securities with investment characteristics similar to those held by the Fund and an additional index over time. Please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. To obtain updated performance information please visit the Fund’s website at harborcapital.com or call 800-422-1050. |
| Performance Past Does Not Indicate Future [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:9pt;"> Please note </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;margin-left:0%;">that the Fund’s past performance (before and after taxes) is not necessarily an indication of 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:9pt;">The bar chart shows how the performance of the Fund has </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;margin-left:0%;">varied from one calendar year to another over the periods shown. The table shows how the Fund’s average annual total returns compare to the returns of the Fund’s benchmark index, which includes securities with investment characteristics similar to those held by the Fund and an additional index over time.</span> |
| Bar Chart [Heading] | <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:4pt;">Calendar Year Total Returns</span> |
| Bar Chart Closing [Text Block] | During the time period shown in the bar chart, the Fund’s highest and lowest returns for a calendar quarter were:Total ReturnsQuarter/YearBest Quarter6.81%Q4 2024Worst Quarter-5.43%Q1 2025 |
| Performance Table Heading | <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:3pt;">Average Annual Total Returns — As of December 31, 2025</span> |
| Performance Table Narrative | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns will depend on a shareholder’s individual tax situation and may differ from those shown. The after-tax returns shown are not relevant to tax-exempt shareholders or shareholders who hold their Fund shares through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account. In some cases, average annual total return “After Taxes on Distributions and Sale of Fund Shares” may exceed the return “Before Taxes” and/or “After Taxes on Distributions” due to an assumed tax benefit for any losses on a sale of Fund shares at the end of the measurement period. |
| Performance Table Uses Highest Federal Rate | <span style="color:#000000;font-family:Times New Roman;font-size:9pt;margin-left:0%;">After-tax returns are calculated using the historical highest individual federal marginal income tax rates 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:9pt;"> Actual after-tax returns will depend on </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;margin-left:0%;">a shareholder’s individual tax situation and may differ from those shown. The after-tax returns shown are not relevant to tax-exempt shareholders or shareholders who hold their Fund shares through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account. </span> |
| Performance Table Explanation after Tax Higher | <span style="color:#000000;font-family:Times New Roman;font-size:9pt;">In some cases, average annual total return </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;margin-left:0%;">“After Taxes on Distributions and Sale of Fund Shares” may exceed the return “Before Taxes” and/or “After Taxes on Distributions” due to an assumed tax benefit for any losses on a sale of Fund </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;">shares at the end of the measurement period.</span> |
| Performance Availability Website Address [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:9pt;font-style:italic;">harborcapital.com</span> |
| Performance Availability Phone [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:9pt;">800-422-1050</span> |
| NONE or SAME | |
| Prospectus [Line Items] | |
| Highest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;margin-left:0.0pt;">Best Quarter</span> |
| Highest Quarterly Return | 6.81% |
| Highest Quarterly Return, Date | Dec. 31, 2024 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;margin-left:0.0pt;">Worst Quarter</span> |
| Lowest Quarterly Return | (5.43%) |
| Lowest Quarterly Return, Date | Mar. 31, 2025 |