S000055816 [Member] Performance Management - U.S. Quality ESG Fund |
Mar. 31, 2026 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | FUND PERFORMANCE |
| Performance Narrative [Text Block] | The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing: (A) changes in the performance of the Fund from year to year and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. The returns shown for periods ended prior to July 30, 2020 for the Class K shares and August 24, 2020 for the Class I shares are those of the Shares Class shares of the Fund at net asset value. Effective July 30, 2020, the Shares Class shares of the Fund were converted into new Class K shares and Class I shares of the Fund. Class K shares commenced operations on July 30, 2020 and Class I shares commenced operations on August 24, 2020. Class K and Class I shares’ returns of the Fund will be different from the returns of the Shares Class shares’ returns of the Fund as they have different expenses. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information for the Fund is available and may be obtained on the Fund’s website at northerntrust.com/funds or by calling 800‑595‑9111.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. |
| Performance Information Illustrates Variability of Returns [Text] | The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing: (A) changes in the performance of the Fund from year to year and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. |
| Bar Chart [Heading] | CALENDAR YEAR TOTAL RETURN (CLASS K SHARES)* |
| Bar Chart Closing [Text Block] | * Year to date total return for the six months ended June 30, 2026 was 7.84%. For the periods shown in the bar chart above, the highest quarterly return was 22.19% in the second quarter of 2020, and the lowest quarterly return was (19.11)% in the first quarter of 2020.
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| Performance Table Heading | AVERAGE ANNUAL TOTAL RETURN (For the periods ended December 31, 2025) |
| 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 depend on an investor’s tax situation and may differ from those shown. After‑tax returns shown are not relevant to investors who hold their shares through tax‑advantaged arrangements, such as 401(k) plans or individual retirement accounts. After‑tax returns are shown only for Class K shares. After‑tax returns for other classes will vary. In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns after taxes on distributions and sale of fund shares to be greater than the Returns after taxes on distributions or even the Returns before taxes.
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| Performance Table Uses Highest Federal Rate | 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. |
| Performance Table Not Relevant to Tax Deferred | Actual after‑tax returns depend on an investor’s tax situation and may differ from those shown. After‑tax returns shown are not relevant to investors who hold their shares through tax‑advantaged arrangements, such as 401(k) plans or individual retirement accounts. |
| Performance Table Explanation after Tax Higher | In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns after taxes on distributions and sale of fund shares to be greater than the Returns after taxes on distributions or even the Returns before taxes. |
| Performance Table One Class of after Tax Shown [Text] | After‑tax returns are shown only for Class K shares. After‑tax returns for other classes will vary. |
| Performance Availability Website Address [Text] | northerntrust.com/funds |
| Performance Availability Phone [Text] | 800‑595‑9111 |
| Class K | |
| Prospectus [Line Items] | |
| Year to Date Return, Label [Optional Text] | Year to date total return |
| Bar Chart, Year to Date Return | 7.84% |
| Bar Chart, Year to Date Return, Date | Jun. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 22.19% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (19.11%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |