| Form N-CSR Cover | 6 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Northern Funds |
| Entity Central Index Key | 0000916620 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Sep. 30, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | Northern Funds | |
| Entity Central Index Key | 0000916620 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Sep. 30, 2024 | |
| U.S. GOVERNMENT MONEY MARKET FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | U.S. GOVERNMENT MONEY MARKET FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOGXX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the U.S. Government Money Market Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 U.S. GOVERNMENT MONEY MARKET FUND (SHARES/NOGXX) $ 0.35 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 18 | [1] |
| Expense Ratio, Percent | 0.35% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years U.S. GOVERNMENT MONEY MARKET FUND (SHARES/NOGXX) 5.15 % 2.10 % 1.42 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 19,965,895,000 | |
| Holdings Count | Holding | 125 | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 125 | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Repurchase Agreements 49.2 % U.S. Government Agencies 33.2 % U.S. Government Obligations 18.7 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| GLOBAL REAL ESTATE INDEX FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | GLOBAL REAL ESTATE INDEX FUND | |
| Class Name | SHARES | |
| Trading Symbol | NGREX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Global Real Estate Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 GLOBAL REAL ESTATE INDEX FUND (SHARES/NGREX) $ 0.47 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 25 | [1] |
| Expense Ratio, Percent | 0.47% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | Index returns may not be visible due to high correlation with the Fund’s returns. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years GLOBAL REAL ESTATE INDEX FUND (SHARES/NGREX) 29.73 % 1.80 % 4.33 % MSCI WORLD INDEX 2 29.30 % 1.39 % 4.23 % MSCI ACWI IMI CORE REAL ESTATE INDEX 32.43 % 13.04 % 10.07 % 1 Index returns may not be visible due to high correlation with the Fund’s returns. 2 Effective July 31, 2024, the Fund changed its broad-based securities market index from the MSCI ACWI IMI Core Real Estate Index | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 1,189,522,000 | |
| Holdings Count | Holding | 547 | |
| Investment Company, Portfolio Turnover | 5.69% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 547 Portfolio turnover rate as of the end of the reporting period 5.69 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY AS A United States Dollar 58.0 % Japanese Yen 8.6 % Australian Dollar 5.2 % Euro 5.0 % All other currencies less than 5% 22.2 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| INTERNATIONAL EQUITY INDEX FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | INTERNATIONAL EQUITY INDEX FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOINX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the International Equity Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 INTERNATIONAL EQUITY INDEX FUND (SHARES/NOINX) $ 0.10 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 5 | [1] |
| Expense Ratio, Percent | 0.10% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years INTERNATIONAL EQUITY INDEX FUND (SHARES/NOINX) 25.47 % 8.20 % 5.69 % MSCI EAFE INDEX 24.77 % 8.20 % 5.71 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 5,321,795,000 | |
| Holdings Count | Holding | 748 | |
| Investment Company, Portfolio Turnover | 7.49% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 748 Portfolio turnover rate as of the end of the reporting period 7.49 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY AS A Euro 32.7 % Japanese Yen 21.9 % British Pound 14.4 % Swiss Franc 9.7 % Australian Dollar 7.5 % All other currencies less than 5% 12.8 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| LARGE CAP VALUE FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | LARGE CAP VALUE FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOLVX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Large Cap Value Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 LARGE CAP VALUE FUND (SHARES/NOLVX) $ 0.57 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 29 | [1] |
| Expense Ratio, Percent | 0.57% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years LARGE CAP VALUE FUND (SHARES/NOLVX) 25.17 % 10.82 % 8.84 % RUSSELL 1000 ® 1 35.68 % 15.64 % 13.10 % RUSSELL 1000 ® 27.76 % 10.69 % 9.23 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Russell 1000 ® ® | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 65,839,000 | |
| Holdings Count | Holding | 164 | |
| Investment Company, Portfolio Turnover | 37.60% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 164 Portfolio turnover rate as of the end of the reporting period 37.60 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Financials 22.0 % Health Care 16.6 % Industrials 13.8 % Information Technology 10.0 % Consumer Discretionary 7.4 % Consumer Staples 6.5 % Energy 5.6 % Utilities 5.5 % All other industries less than 5% 12.6 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| U.S. GOVERNMENT SELECT MONEY MARKET FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | U.S. GOVERNMENT SELECT MONEYMARKET FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOSXX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the U.S. Government Select Money Market Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 U.S. GOVERNMENT SELECT MONEY MARKET FUND (SHARES/NOSXX) $ 0.35 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 18 | [1] |
| Expense Ratio, Percent | 0.35% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years U.S. GOVERNMENT SELECT MONEY MARKET FUND (SHARES/NOSXX) 5.18 % 2.16 % 1.45 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 4,597,519,000 | |
| Holdings Count | Holding | 121 | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 121 | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Repurchase Agreements 47.8 % U.S. Government Agencies 32.7 % U.S. Government Obligations 19.6 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| U.S. TREASURY INDEX FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | U.S. TREASURY INDEX FUND | |
| Class Name | SHARES | |
| Trading Symbol | BTIAX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the U.S. Treasury Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 U.S. TREASURY INDEX FUND (SHARES/BTIAX) $ 0.16 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 8 | [1] |
| Expense Ratio, Percent | 0.16% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | Index returns may not be visible due to high correlation with the Fund’s returns. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years U.S. TREASURY INDEX FUND (SHARES/BTIAX) 9.58 % -0.35 % 1.18 % BLOOMBERG U.S. AGGREGATE BOND INDEX 2 11.57 % 0.33 % 1.84 % BLOOMBERG U.S. TREASURY INDEX 9.72 % -0.20 % 1.34 % 1 Index returns may not be visible due to high correlation with the Fund’s returns. 2 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg rg | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Apr. 01, 2024 | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 77,948,000 | |
| Holdings Count | Holding | 286 | |
| Investment Company, Portfolio Turnover | 17.34% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 286 Portfolio turnover rate as of the end of the reporting period 17.34 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS U.S. Government Obligations 99.2 % Other less than 5% 0.2 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| Material Fund Change [Text Block] | How Has the Fund Changed? This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review the Fund's prospectus, which is available at northerntrust.com/funds#literature The Board of Trustees (the “Board”) of Northern Funds (the "Trust"), upon the recommendation of Northern Trust Investments, Inc., investment adviser to the Trust, has determined that it is in the best interests of the Fund and its shareholders that the Fund be liquidated and terminated pursuant to a plan of liquidation and termination approved by the Board. | |
| Material Fund Change Adviser [Text Block] | The Board of Trustees (the “Board”) of Northern Funds (the "Trust"), upon the recommendation of Northern Trust Investments, Inc., investment adviser to the Trust, has determined that it is in the best interests of the Fund and its shareholders that the Fund be liquidated and terminated pursuant to a plan of liquidation and termination approved by the Board. | |
| Summary of Change Legend [Text Block] | This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review the Fund's prospectus, which is available at northerntrust.com/funds#literature | |
| Updated Prospectus Phone Number | 800-595-9111 | |
| Updated Prospectus Web Address | northerntrust.com/funds#literature | |
| SMALL CAP CORE FUND - CLASS I | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SMALL CAP CORE FUND | |
| Class Name | CLASS I | |
| Trading Symbol | NSGRX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Small Cap Core Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Cost of $10,000 Investment 1 Costs paid as a percentage of a $10,000 investment 1,2 SMALL CAP CORE FUND $ 0.59 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 30 | [1] |
| Expense Ratio, Percent | 0.59% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years SMALL CAP CORE FUND (CLASS I/NSGRX) 26.82 % 10.30 % 9.14 % RUSSELL 3000 ® 1 35.19 % 15.26 % 12.83 % RUSSELL 2000 ® 26.76 % 9.39 % 8.78 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Russell 2000 ® ® | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Apr. 01, 2024 | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 422,165,000 | |
| Holdings Count | Holding | 1,538 | |
| Investment Company, Portfolio Turnover | 11.26% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 1,538 Portfolio turnover rate as of the end of the reporting period 11.26 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Industrials 17.4 % Financials 16.7 % Health Care 16.4 % Information Technology 11.6 % Consumer Discretionary 9.9 % Real Estate 5.9 % Energy 5.1 % All other industries less than 5% 17.1 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| Material Fund Change [Text Block] | How Has the Fund Changed? This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review the Fund's prospectus, which is available at northerntrust.com/funds#literature The Board of Trustees of Northern Funds has approved reductions in the Fund’s contractual expense limitation amount and management fee charged by Northern Trust Investments, Inc., the Fund’s investment adviser, effective January 1, 2025. Accordingly, effective January 1, 2025, the Fund’s contractual expense limitation and management fee will be 0.40% and 0.38%, respectively. | |
| Material Fund Change Expenses [Text Block] | The Board of Trustees of Northern Funds has approved reductions in the Fund’s contractual expense limitation amount and management fee charged by Northern Trust Investments, Inc., the Fund’s investment adviser, effective January 1, 2025. Accordingly, effective January 1, 2025, the Fund’s contractual expense limitation and management fee will be 0.40% and 0.38%, respectively. | |
| Summary of Change Legend [Text Block] | This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review the Fund's prospectus, which is available at northerntrust.com/funds#literature | |
| Updated Prospectus Phone Number | 800-595-9111 | |
| Updated Prospectus Web Address | northerntrust.com/funds#literature | |
| SMALL CAP CORE FUND - CLASS K | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SMALL CAP CORE FUND | |
| Class Name | CLASS K | |
| Trading Symbol | NSCKX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Small Cap Core Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Cost of $10,000 Investment 1 Costs paid as a percentage of a $10,000 investment 1,2 SMALL CAP CORE FUND $ 0.49 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 25 | [1] |
| Expense Ratio, Percent | 0.49% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years SMALL CAP CORE FUND (CLASS K/NSCKX) 26.92 % 10.38 % 9.18 % RUSSELL 3000 ® 1 35.19 % 15.26 % 12.83 % RUSSELL 2000 ® 26.76 % 9.39 % 8.78 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Russell 2000 ® ® | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Apr. 01, 2024 | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 422,165,000 | |
| Holdings Count | Holding | 1,538 | |
| Investment Company, Portfolio Turnover | 11.26% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 1,538 Portfolio turnover rate as of the end of the reporting period 11.26 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Industrials 17.4 % Financials 16.7 % Health Care 16.4 % Information Technology 11.6 % Consumer Discretionary 9.9 % Real Estate 5.9 % Energy 5.1 % All other industries less than 5% 17.1 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| Material Fund Change [Text Block] | How Has the Fund Changed? This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review the northerntrust.com/funds#literature The Board of Trustees of Northern Funds has approved reductions in the Fund’s contractual expense limitation amount and management fee charged by Northern Trust Investments, Inc., the Fund’s investment adviser, effective January 1, 2025. Accordingly, effective January 1, 2025, the Fund’s contractual expense limitation and management fee will be 0.40% and 0.38%, respectively. | |
| Material Fund Change Expenses [Text Block] | The Board of Trustees of Northern Funds has approved reductions in the Fund’s contractual expense limitation amount and management fee charged by Northern Trust Investments, Inc., the Fund’s investment adviser, effective January 1, 2025. Accordingly, effective January 1, 2025, the Fund’s contractual expense limitation and management fee will be 0.40% and 0.38%, respectively. | |
| Summary of Change Legend [Text Block] | This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review the northerntrust.com/funds#literature | |
| Updated Prospectus Phone Number | 800-595-9111 | |
| Updated Prospectus Web Address | northerntrust.com/funds#literature | |
| HIGH YIELD FIXED INCOME FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | HIGH YIELD FIXED INCOME FUND | |
| Class Name | SHARES | |
| Trading Symbol | NHFIX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the High Yield Fixed Income Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 HIGH YIELD FIXED INCOME FUND (SHARES/NHFIX) $31 0.60 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 31 | [1] |
| Expense Ratio, Percent | 0.60% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years HIGH YIELD FIXED INCOME FUND (SHARES/NHFIX) 15.45 % 4.61 % 4.47 % BLOOMBERG UNIVERSAL INDEX 1 12.08 % 0.70 % 2.15 % BLOOMBERG U.S. CORPORATE HIGH YIELD 2% ISSUER CAPPED INDEX 15.73 % 4.70 % 5.04 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index to the Bloomberg Universal Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 2,810,046,000 | |
| Holdings Count | Holding | 515 | |
| Investment Company, Portfolio Turnover | 23.47% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 515 Portfolio turnover rate as of the end of the reporting period 23.47 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Corporate Bonds 80.8 % Foreign Issuer Bonds 14.5 % Other less than 5% 5.1 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| CORE BOND FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | CORE BOND FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOCBX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Core Bond Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 CORE BOND FUND (SHARES/NOCBX) $ 0.41 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 21 | [1] |
| Expense Ratio, Percent | 0.41% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years CORE BOND FUND (SHARES/NOCBX) 11.87 % 0.25 % 1.72 % BLOOMBERG U.S. AGGREGATE BOND INDEX 11.57 % 0.33 % 1.84 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 95,352,000 | |
| Holdings Count | Holding | 377 | |
| Investment Company, Portfolio Turnover | 61.45% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 377 Portfolio turnover rate as of the end of the reporting period 61.45 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS U.S. Government Agencies 32.4 % Corporate Bonds 23.9 % U.S. Government Obligations 23.9 % Foreign Issuer Bonds 10.3 % Asset-Backed Securities 6.5 % Other less than 5% 4.2 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| SHORT BOND FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SHORT BOND FUND | |
| Class Name | SHARES | |
| Trading Symbol | BSBAX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Short Bond Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 SHORT BOND FUND (SHARES/BSBAX) $ 0.40 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 20 | [1] |
| Expense Ratio, Percent | 0.40% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years SHORT BOND FUND (SHARES/BSBAX) 7.41 % 1.79 % 1.72 % BLOOMBERG U.S. AGGREGATE BOND INDEX 2 11.57 % 0.33 % 1.84 % BLOOMBERG 1-3 YEAR U.S. GOVERNMENT/CREDIT INDEX 7.19 % 1.70 % 1.64 % 1 Index returns may not be visible due to high correlation with the Fund’s returns. 2 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg 1-3 Year U.S. Government/Credit Index to the Bloomberg U.S. Aggregate Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 296,945,000 | |
| Holdings Count | Holding | 211 | |
| Investment Company, Portfolio Turnover | 42.25% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 211 Portfolio turnover rate as of the end of the reporting period 42.25 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS U.S. Government Obligations 46.4 % Corporate Bonds 26.4 % Foreign Issuer Bonds 9.3 % U.S. Government Agencies 8.4 % Asset-Backed Securities 5.5 % Other less than 5% 5.7 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| GLOBAL TACTICAL ASSET ALLOCATION FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | GLOBAL TACTICAL ASSET ALLOCATION FUND | |
| Class Name | SHARES | |
| Trading Symbol | BBALX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Global Tactical Asset Allocation Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2,3 GLOBAL TACTICAL ASSET ALLOCATION FUND (SHARES/BBALX) $ 0.27 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio reflects only the direct expenses of the Fund and not any expenses associated with the underlying funds. 3 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 14 | [1] |
| Expense Ratio, Percent | 0.27% | [1],[2],[3] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years GLOBAL TACTICAL ASSET ALLOCATION FUND (SHARES/BBALX) 19.13 % 5.89 % 5.28 % MSCI ACWI INDEX 31.76 % 12.19 % 9.39 % BLOOMBERG U.S. AGGREGATE BOND INDEX 11.57 % 0.33 % 1.84 % BLENDED INDEX (60% MSCI ALL COUNTRY WORLD INDEX AND 40% BLOOMBERG U.S. AGGREGATE BOND INDEX) 23.38 % 7.58 % 6.54 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 83,646,000 | |
| Holdings Count | Holding | 15 | |
| Investment Company, Portfolio Turnover | 76.94% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 15 Portfolio turnover rate as of the end of the reporting period 76.94 % | |
| Holdings [Text Block] | ASSET CLASS WEIGHTINGS U.S. Equity 41.7 % U.S. Bonds - Investment Grade 27.8 % Non U.S. Equity - Developed 15.3 % Non U.S. Equity - Emerging Markets 7.6 % U.S. Bonds - High Yield 4.9 % Global Infrastructure 1.0 % Global Real Estate 1.0 % Cash 0.7 % | |
| MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MULTI-MANAGER HIGH YIELDOPPORTUNITY FUND | |
| Class Name | SHARES | |
| Trading Symbol | NMHYX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Multi-Manager High Yield Opportunity Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND (SHARES/NMHYX) $ 0.68 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 35 | [1] |
| Expense Ratio, Percent | 0.68% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND (SHARES/NMHYX) 14.35 % 4.69 % 4.52 % BLOOMBERG UNIVERSAL INDEX 1 12.08 % 0.70 % 2.15 % ICE BofA U.S. HIGH YIELD CONSTRAINED INDEX 15.67 % 4.53 % 4.95 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the ICE BofA U.S. High Yield Constrained Index to the Bloomberg Universal Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 188,227,000 | |
| Holdings Count | Holding | 1,542 | |
| Investment Company, Portfolio Turnover | 27.84% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 1,542 Portfolio turnover rate as of the end of the reporting period 27.84 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Corporate Bonds 79.6 % Foreign Issuer Bonds 9.0 % Other less than 5% 10.6 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| SMALL CAP INDEX FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SMALL CAP INDEX FUND | |
| Class Name | SHARES | |
| Trading Symbol | NSIDX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Small Cap Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 SMALL CAP INDEX FUND (SHARES/NSIDX) $ 0.10 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 5 | [1] |
| Expense Ratio, Percent | 0.10% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years SMALL CAP INDEX FUND (SHARES/NSIDX) 26.64 % 9.21 % 8.63 % RUSSELL 3000 ® 2 35.19 % 15.26 % 12.83 % RUSSELL 2000 ® 26.76 % 9.39 % 8.78 % 1 Index returns may not be visible due to high correlation with the Fund’s returns. 2 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Russell 2000 ® ® | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 1,257,354,000 | |
| Holdings Count | Holding | 1,993 | |
| Investment Company, Portfolio Turnover | 12.42% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 1,993 Portfolio turnover rate as of the end of the reporting period 12.42 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Financials 17.3 % Health Care 17.3 % Industrials 16.6 % Information Technology 12.5 % Consumer Discretionary 9.8 % Real Estate 6.2 % Energy 5.2 % All other industries less than 5% 15.0 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| U.S. QUALITY ESG FUND - CLASS I | ||
| Shareholder Report [Line Items] | ||
| Fund Name | U.S. QUALITY ESG FUND | |
| Class Name | CLASS I | |
| Trading Symbol | NUEIX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the U.S. Quality ESG Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Cost of $10,000 Investment 1 Costs paid as a percentage of a $10,000 investment 1,2 U.S. QUALITY ESG FUND $ 0.49 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 26 | [1] |
| Expense Ratio, Percent | 0.49% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years Since U.S. QUALITY ESG FUND (CLASS I/NUEIX) 32.17 % 15.68 % 14.04 % RUSSELL 1000 ® 35.68 % 15.64 % 14.12 % | |
| Performance Inception Date | Oct. 02, 2017 | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 506,559,000 | |
| Holdings Count | Holding | 173 | |
| Investment Company, Portfolio Turnover | 16.81% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 173 Portfolio turnover rate as of the end of the reporting period 16.81 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Information Technology 31.2 % Financials 13.0 % Consumer Discretionary 11.7 % Health Care 10.9 % Industrials 10.8 % Communication Services 7.9 % Consumer Staples 5.6 % All other industries less than 5% 8.8 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| U.S. QUALITY ESG FUND - CLASS K | ||
| Shareholder Report [Line Items] | ||
| Fund Name | U.S. QUALITY ESG FUND | |
| Class Name | CLASS K | |
| Trading Symbol | NUESX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the U.S. Quality ESG Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Cost of $10,000 Investment 1 Costs paid as a percentage of a $10,000 investment 1,2 U.S. QUALITY ESG FUND $ 0.39 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 20 | [1] |
| Expense Ratio, Percent | 0.39% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years Since U.S. QUALITY ESG FUND (CLASS K/NUESX) 32.35 % 15.77 % 14.10 % RUSSELL 1000 ® 35.68 % 15.64 % 14.12 % | |
| Performance Inception Date | Oct. 02, 2017 | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 506,559,000 | |
| Holdings Count | Holding | 173 | |
| Investment Company, Portfolio Turnover | 16.81% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 173 Portfolio turnover rate as of the end of the reporting period 16.81 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Information Technology 31.2 % Financials 13.0 % Consumer Discretionary 11.7 % Health Care 10.9 % Industrials 10.8 % Communication Services 7.9 % Consumer Staples 5.6 % All other industries less than 5% 8.8 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| ARIZONA TAX-EXEMPT FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | ARIZONA TAX-EXEMPT FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOAZX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Arizona Tax-Exempt Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 ARIZONA TAX-EXEMPT FUND $ 0.47 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 24 | [1] |
| Expense Ratio, Percent | 0.47% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years ARIZONA TAX-EXEMPT FUND (SHARES/NOAZX) 9.67 % 0.64 % 1.98 % BLOOMBERG U.S. MUNICIPAL BOND INDEX1 10.37 % 1.39 % 2.52 % BLOOMBERG ARIZONA MUNICIPAL BOND INDEX 10.10 % 1.22 % 2.33 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg Arizona Municipal Bond Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 60,513,000 | |
| Holdings Count | Holding | 65 | |
| Investment Company, Portfolio Turnover | 31.13% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 65 Portfolio turnover rate as of the end of the reporting period 31.13 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Revenue Bonds 65.2 % General Obligation Unlimited Bonds 24.5 % Certificates of Participation 3.8 % Money Market Funds 3.6 % Special Assessment Bonds 1.3 % General Obligation Limited Bonds 0.7 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | CALIFORNIA INTERMEDIATETAX-EXEMPT FUND | |
| Class Name | SHARES | |
| Trading Symbol | NCITX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the California Intermediate Tax-Exempt Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND (SHARES/NCITX) $ 0.45 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 23 | [1] |
| Expense Ratio, Percent | 0.45% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND (SHARES/NCITX) 9.01 % 0.73 % 1.83 % BLOOMBERG U.S. MUNICIPAL BOND INDEX 1 10.37 % 1.39 % 2.52 % BLOOMBERG CALIFORNIA INTERMEDIATE MUNICIPAL BOND INDEX 8.14 % 1.20 % 2.07 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg California Intermediate Municipal Bond Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 248,523,000 | |
| Holdings Count | Holding | 132 | |
| Investment Company, Portfolio Turnover | 22.47% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 132 Portfolio turnover rate as of the end of the reporting period 22.47 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Revenue Bonds 62.0 % General Obligation Unlimited Bonds 31.3 % Money Market Funds 2.9 % Certificates of Participation 2.5 % Special Tax Bonds 1.7 % Tax Allocation Bonds 0.7 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| ULTRA-SHORT FIXED INCOME FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | ULTRA-SHORT FIXED INCOME FUND | |
| Class Name | SHARES | |
| Trading Symbol | NUSFX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Ultra-Short Fixed Income Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | Fund (Class) Cost of $10,000 Investment 1 Costs paid as a percentage of a $10,000 investment 1,2 ULTRA-SHORT FIXED INCOME FUND $ 13 0.25 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 13 | [1] |
| Expense Ratio, Percent | 0.25% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years ULTRA-SHORT FIXED INCOME FUND (SHARES/NUSFX) 6.85 % 2.58 % 2.10 % BLOOMBERG GLOBAL AGGREGATE BOND INDEX 1 11.98 % -0.83 % 0.57 % ICE BofA 1-YEAR U.S. TREASURY NOTE INDEX 5.87 % 1.99 % 1.55 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the ICE BofA 1-Year U.S. Treasury Note Index to the Bloomberg Global Aggregate Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 1,648,432,000 | |
| Holdings Count | Holding | 208 | |
| Investment Company, Portfolio Turnover | 22.04% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 208 Portfolio turnover rate as of the end of the reporting period 22.04 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Foreign Issuer Bonds 42.7 % Corporate Bonds 39.1 % U.S. Government Obligations 7.3 % Asset-Backed Securities 5.9 % Other less than 5% 4.3 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| ULTRA-SHORT FIXED INCOME FUND - SIEBERT WILLIAMS SHANK SHARES | ||
| Shareholder Report [Line Items] | ||
| Fund Name | ULTRA-SHORT FIXED INCOME FUND | |
| Class Name | SIEBERT WILLIAMS SHANK SHARES | |
| Trading Symbol | SWSFX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Ultra-Short Fixed Income Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Cost of $10,000 Investment 1 Costs paid as a percentage of a $10,000 investment 1,2 ULTRA-SHORT FIXED INCOME FUND $ 13 0.25 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 13 | [1] |
| Expense Ratio, Percent | 0.25% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years ULTRA-SHORT FIXED INCOME FUND (SIEBERT WILLIAMS SHANK SHARES/SWSFX) 6.85 % 2.58 % 2.10 % BLOOMBERG GLOBAL AGGREGATE BOND INDEX 1 11.98 % -0.83 % 0.57 % ICE BofA 1-YEAR U.S. TREASURY NOTE INDEX 5.87 % 1.99 % 1.55 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the ICE BofA 1-Year U.S. Treasury Note Index to the Bloomberg Global Aggregate Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 1,648,432,000 | |
| Holdings Count | Holding | 208 | |
| Investment Company, Portfolio Turnover | 22.04% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 208 Portfolio turnover rate as of the end of the reporting period 22.04 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Foreign Issuer Bonds 42.7 % Corporate Bonds 39.1 % U.S. Government Obligations 7.3 % Asset-Backed Securities 5.9 % Other less than 5% 4.3 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | TAX-ADVANTAGED ULTRA-SHORTFIXED INCOME FUND | |
| Class Name | SHARES | |
| Trading Symbol | NTAUX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Tax-Advantaged Ultra-Short Fixed Income Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND (SHARES/NTAUX) $ 0.25 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 13 | [1] |
| Expense Ratio, Percent | 0.25% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND (SHARES/NTAUX) 5.18 % 1.80 % 1.43 % BLOOMBERG U.S. MUNICIPAL BOND INDEX 2 10.37 % 1.39 % 2.52 % ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX 4.07 % 1.57 % 1.24 % ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX 5.47 % 1.40 % 1.30 % 75% ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX AND 25% ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX 4.42 % 1.53 % 1.26 % 1 Index returns may not be visible due to high correlation with the Fund’s returns. 2 Effective July 31, 2024, the Fund changed its broad-based securities market index from the 75% ICE BofA 6-12 Month Municipal Securities Index and 25% ICE BofA 1-3 Year US Municipal Securities Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 2,562,803,000 | |
| Holdings Count | Holding | 442 | |
| Investment Company, Portfolio Turnover | 27.86% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 442 Portfolio turnover rate as of the end of the reporting period 27.86 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Municipal Bonds 64.9 % Short-Term Investments 13.3 % Foreign Issuer Bonds 10.7 % Corporate Bonds 7.7 % Other less than 5% 6.6 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| Multi-Manager Global Real Estate Fund | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MULTI-MANAGER GLOBAL REAL ESTATE FUND | |
| Class Name | SHARES | |
| Trading Symbol | NMMGX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Multi-Manager Global Real Estate Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 MULTI-MANAGER GLOBAL REAL ESTATE FUND (SHARES/NMMGX) $ 0.92 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 48 | [1] |
| Expense Ratio, Percent | 0.92% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years MULTI-MANAGER GLOBAL REAL ESTATE FUND (SHARES/NMMGX) 26.27 % 2.36 % 4.70 % MSCI ACWI INDEX 1 31.76 % 12.19 % 9.39 % FTSE EPRA NAREIT DEVELOPED INDEX 28.86 % 1.39 % 4.06 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the FTSE EPRA Nareit Developed Index to the MSCI ACWI Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 139,638,000 | |
| Holdings Count | Holding | 96 | |
| Investment Company, Portfolio Turnover | 31.85% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 96 Portfolio turnover rate as of the end of the reporting period 31.85 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY AS A United States Dollar 69.0 % British Pound 6.7 % Japanese Yen 6.0 % Australian Dollar 5.9 % Euro 5.7 % All other currencies less than 5% 6.7 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| Active M Emerging Markets Equity Fund | ||
| Shareholder Report [Line Items] | ||
| Fund Name | ACTIVE M EMERGING MARKETS EQUITY FUND | |
| Class Name | SHARES | |
| Trading Symbol | NMMEX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Active M Emerging Markets Equity Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 ACTIVE M EMERGING MARKETS EQUITY FUND (SHARES/NMMEX) $ 58 1.11 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 58 | [1] |
| Expense Ratio, Percent | 1.11% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years ACTIVE M EMERGING MARKETS EQUITY FUND (SHARES/NMMEX) 22.39 % 5.02 % 3.30 % MSCI EM (EMERGING MARKETS) INDEX 26.05 % 5.75 % 4.02 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Apr. 01, 2024 | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 167,259,000 | |
| Holdings Count | Holding | 177 | |
| Investment Company, Portfolio Turnover | 77.75% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 177 Portfolio turnover rate as of the end of the reporting period 77.75 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY AS A United States Dollar 19.2 % Indian Rupee 17.7 % Hong Kong Dollar 14.5 % Taiwan Dollar 13.3 % Korean Won 12.7 % South African Rand 5.7 % All other currencies less than 5% 19.7 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| Material Fund Change [Text Block] | How Has the Fund Changed This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review t he northerntrust.com/funds#literature The Board of Trustees of Northern Funds approved the termination of Ashmore Investment Management Limited as a sub-adviser to the Fund effective September 17, 2024, and the appointment of FIAM LLC as a sub-adviser to the Fund effective September 30, 2024. | |
| Material Fund Change Adviser [Text Block] | The Board of Trustees of Northern Funds approved the termination of Ashmore Investment Management Limited as a sub-adviser to the Fund effective September 17, 2024, and the appointment of FIAM LLC as a sub-adviser to the Fund effective September 30, 2024. | |
| Summary of Change Legend [Text Block] | This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review t he northerntrust.com/funds#literature | |
| Updated Prospectus Phone Number | 800-595-9111 | |
| Updated Prospectus Web Address | northerntrust.com/funds#literature | |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS I | ||
| Shareholder Report [Line Items] | ||
| Fund Name | GLOBAL SUSTAINABILITY INDEX FUND | |
| Class Name | CLASS I | |
| Trading Symbol | NSRIX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Global Sustainability Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Cost of $10,000 Investment 1 Costs paid as a percentage 1,2 GLOBAL SUSTAINABILITY INDEX FUND $ 0.29 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 15 | [1] |
| Expense Ratio, Percent | 0.29% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years GLOBAL SUSTAINABILITY INDEX FUND (CLASS I/NSRIX) 33.12 % 13.36 % 10.30 % MSCI WORLD INDEX 2 32.43 % 13.04 % 10.07 % MSCI WORLD ESG LEADERS INDEX 32.89 % 13.29 % 10.19 % 1 Index returns may not be visible due to high correlation with the Fund’s returns. 2 Effective July 31, 2024, the Fund changed its broad-based securities market index from the MSCI World ESG Leaders Index to the MSCI World Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 2,027,243,000 | |
| Holdings Count | Holding | 717 | |
| Investment Company, Portfolio Turnover | 9.58% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 717 Portfolio turnover rate as of the end of the reporting period 9.58 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY AS A United States Dollar 72.2 % Euro 7.3 % Japanese Yen 6.0 % All other currencies less than 5% 13.9 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS K | ||
| Shareholder Report [Line Items] | ||
| Fund Name | GLOBAL SUSTAINABILITY INDEX FUND | |
| Class Name | CLASS K | |
| Trading Symbol | NSRKX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Global Sustainability Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Cost of $10,000 Investment 1 Costs paid as a percentage of a $10,000 investment 1,2 GLOBAL SUSTAINABILITY INDEX FUND $ 0.24 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 12 | [1] |
| Expense Ratio, Percent | 0.24% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years GLOBAL SUSTAINABILITY INDEX FUND (CLASS K/NSRKX) 33.21 % 13.41 % 10.32 % MSCI WORLD INDEX 2 32.43 % 13.04 % 10.07 % MSCI WORLD ESG LEADERS INDEX 32.89 % 13.29 % 10.19 % 1 Index returns may not be visible due to high correlation with the Fund’s returns. 2 Effective July 31, 2024, the Fund changed its broad-based securities market index from the MSCI World ESG Leaders Index to the MSCI World Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 2,027,243,000 | |
| Holdings Count | Holding | 717 | |
| Investment Company, Portfolio Turnover | 9.58% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 717 Portfolio turnover rate as of the end of the reporting period 9.58 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY AS A United States Dollar 72.2 % Euro 7.3 % Japanese Yen 6.0 % All other currencies less than 5% 13.9 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| LIMITED TERM TAX-EXEMPT FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | LIMITED TERM TAX-EXEMPT FUND | |
| Class Name | SHARES | |
| Trading Symbol | NSITX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Limited Term Tax-Exempt Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 LIMITED TERM TAX-EXEMPT FUND (SHARES/NSITX) $ 0.45 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 23 | [1] |
| Expense Ratio, Percent | 0.45% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years LIMITED TERM TAX-EXEMPT FUND (SHARES/NSITX) 6.13 % 1.34 % 1.33 % BLOOMBERG U.S. MUNICIPAL BOND INDEX 1 10.37 % 1.39 % 2.52 % BLOOMBERG 1-5 YEAR BLEND MUNICIPAL BOND INDEX 6.41 % 1.36 % 1.50 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg 1-5 Year Blend Municipal Bond Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 384,507,000 | |
| Holdings Count | Holding | 189 | |
| Investment Company, Portfolio Turnover | 21.37% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 189 Portfolio turnover rate as of the end of the reporting period 21.37 % | |
| Holdings [Text Block] | STATE ALLOCATION NET Texas 14.4 % New York 11.6 % Alabama 5.4 % Colorado 5.1 % All other states less than 5% 64.7 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| LIMITED TERM U.S. GOVERNMENT FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | LIMITED TERM U.S. GOVERNMENT FUND | |
| Class Name | SHARES | |
| Trading Symbol | NSIUX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Limited Term U.S. Government Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 LIMITED TERM U.S. GOVERNMENT FUND (SHARES/NSIUX) $ 0.44 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 22 | [1] |
| Expense Ratio, Percent | 0.44% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years LIMITED TERM U.S. GOVERNMENT FUND (SHARES/NSIUX) 7.21 % 0.84 % 1.06 % BLOOMBERG U.S. AGGREGATE BOND INDEX 1 11.57 % 0.33 % 1.84 % BLOOMBERG 1-5 YEAR U.S. GOVERNMENT INDEX 7.49 % 1.24 % 1.47 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg 1-5 Year U.S. Government Index to the Bloomberg U.S. Aggregate Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 24,067,000 | |
| Holdings Count | Holding | 59 | |
| Investment Company, Portfolio Turnover | 20.70% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 59 Portfolio turnover rate as of the end of the reporting period 20.70 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS U.S. Government Obligations 96.6 % Other less than 5% 3.2 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| BOND INDEX FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BOND INDEX FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOBOX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Bond Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 BOND INDEX FUND (SHARES/NOBOX) $ 0.07 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 4 | [1] |
| Expense Ratio, Percent | 0.07% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years BOND INDEX FUND (SHARES/NOBOX) 11.53 % 0.24 % 1.73 % BLOOMBERG U.S. AGGREGATE BOND INDEX 11.57 % 0.33 % 1.84 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 2,426,243,000 | |
| Holdings Count | Holding | 3,641 | |
| Investment Company, Portfolio Turnover | 22.97% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 3,641 Portfolio turnover rate as of the end of the reporting period 22.97 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS U.S. Government Obligations 42.8 % U.S. Government Agencies 26.7 % Corporate Bonds 21.2 % Foreign Issuer Bonds 6.3 % Other less than 5% 3.9 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| ACTIVE M INTERNATIONAL EQUITY FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | ACTIVE M INTERNATIONAL EQUITY FUND | |
| Class Name | SHARES | |
| Trading Symbol | NMIEX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Active M International Equity Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 ACTIVE M INTERNATIONAL EQUITY FUND (SHARES/NMIEX) $ 0.85 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 44 | [1] |
| Expense Ratio, Percent | 0.85% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years ACTIVE M INTERNATIONAL EQUITY FUND (SHARES/NMIEX) 25.66 % 9.85 % 5.98 % MSCI WORLD EX USA IMI INDEX 24.77 % 8.14 % 5.71 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 512,621,000 | |
| Holdings Count | Holding | 462 | |
| Investment Company, Portfolio Turnover | 18.65% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 462 Portfolio turnover rate as of the end of the reporting period 18.65 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY AS A Euro 29.1 % United States Dollar 20.9 % British Pound 19.2 % Japanese Yen 11.6 % All other currencies less than 5% 18.4 % Figures in the above table may | |
| EMERGING MARKETS EQUITY INDEX FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | EMERGING MARKETS EQUITY INDEX FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOEMX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Emerging Markets Equity Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 EMERGING MARKETS EQUITY INDEX FUND (SHARES/NOEMX) $ 0.15 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 8 | [1] |
| Expense Ratio, Percent | 0.15% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years EMERGING MARKETS EQUITY INDEX FUND (SHARES/NOEMX) 24.58 % 4.92 % 3.46 % MSCI EM (EMERGING MARKETS) INDEX 26.05 % 5.75 % 4.02 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 1,911,369,000 | |
| Holdings Count | Holding | 1,334 | |
| Investment Company, Portfolio Turnover | 8.29% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 1,334 Portfolio turnover rate as of the end of the reporting period 8.29 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY Hong Kong Dollar 22.4 % Indian Rupee 19.0 % Taiwan Dollar 17.3 % Korean Won 10.2 % United States Dollar 7.2 % All other currencies less than 5% 24.8 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| LARGE CAP CORE FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | LARGE CAP CORE FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOLCX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Large Cap Core Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 LARGE CAP CORE FUND (SHARES/NOLCX) $ 0.45 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 24 | [1] |
| Expense Ratio, Percent | 0.45% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years LARGE CAP CORE FUND (SHARES/NOLCX) 37.30 % 16.04 % 12.11 % S&P 500 ® 36.35 % 15.98 % 13.38 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 301,688,000 | |
| Holdings Count | Holding | 168 | |
| Investment Company, Portfolio Turnover | 11.46% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 168 Portfolio turnover rate as of the end of the reporting period 11.46 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Information Technology 31.0 % Financials 12.8 % Health Care 11.8 % Consumer Discretionary 10.0 % Communication Services 9.0 % Industrials 8.7 % Consumer Staples 6.0 % All other industries less than 5% 10.6 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| MID CAP INDEX FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MID CAP INDEX FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOMIX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Mid Cap Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 MID CAP INDEX FUND (SHARES/NOMIX) $ 0.10 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an | |
| Expenses Paid, Amount | $ 5 | [1] |
| Expense Ratio, Percent | 0.10% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | Index returns may not be visible due to high correlation with the Fund’s returns. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years MID CAP INDEX FUND (SHARES/NOMIX) 26.66 % 11.64 % 10.17 % RUSSELL 3000 ® 2 35.19 % 15.26 % 12.83 % S&P MIDCAP 400® INDEX 26.79 % 11.78 % 10.32 % 1 Index returns may not be visible due to high correlation with the Fund’s returns. 2 Effective July 31, 2024, the Fund changed its broad-based securities market index from the S&P Midcap 400 ® ® | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 2,120,139,000 | |
| Holdings Count | Holding | 407 | |
| Investment Company, Portfolio Turnover | 9.88% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 407 Portfolio turnover rate as of the end of the reporting period 9.88 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Industrials 22.5 % Financials 16.5 % Consumer 14.2 % Health Care 9.9 % Information Technology 8.9 % Real Estate 7.3 % Materials 6.4 % All other industries less than 5% 14.5 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| HIGH YIELD MUNICIPAL FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | HIGH YIELD MUNICIPAL FUND | |
| Class Name | SHARES | |
| Trading Symbol | NHYMX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the High Yield Municipal Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 HIGH YIELD MUNICIPAL FUND (SHARES/NHYMX) $ 0.58 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 30 | [1] |
| Expense Ratio, Percent | 0.58% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years HIGH YIELD MUNICIPAL FUND (SHARES/NHYMX) 14.83 % 0.73 % 2.51 % BLOOMBERG U.S. MUNICIPAL BOND INDEX 1 10.37 % 1.39 % 2.52 % BLOOMBERG MUNICIPAL BOND 60% HIGH YIELD/40% INVESTMENT GRADE INDEX 14.53 % 2.42 % 3.73 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg Municipal Bond 60% High Yield/40% Investment Grade Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Apr. 01, 2024 | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 390,913,000 | |
| Holdings Count | Holding | 282 | |
| Investment Company, Portfolio Turnover | 13.35% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 282 Portfolio turnover rate as of the end of the reporting period 13.35 % | |
| Holdings [Text Block] | STATE ALLOCATION California 10.6 % Texas 8.6 % Florida 8.2 % Indiana 5.0 % All other states less than 5% 65.9 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| Material Fund Change [Text Block] | How Has the Fund Changed? This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review the northerntrust.com/funds#literature The Board of Trustees (the “Board”) of Northern Funds (the "Trust"), upon the recommendation of Northern Trust Investments, Inc., investment adviser to the Trust, has determined that it is in the best interests of the Fund and its shareholders that the Fund be liquidated and terminated on or about January 31, 2025, pursuant to a plan of liquidation and termination approved by the Board. The liquidation date may be changed at the discretion of the Trust's officers. | |
| Material Fund Change Adviser [Text Block] | The Board of Trustees (the “Board”) of Northern Funds (the "Trust"), upon the recommendation of Northern Trust Investments, Inc., investment adviser to the Trust, has determined that it is in the best interests of the Fund and its shareholders that the Fund be liquidated and terminated on or about January 31, 2025, pursuant to a plan of liquidation and termination approved by the Board. The liquidation date may be changed at the discretion of the Trust's officers. | |
| Summary of Change Legend [Text Block] | This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete information, you may review the northerntrust.com/funds#literature | |
| Updated Prospectus Phone Number | 800-595-9111 | |
| Updated Prospectus Web Address | northerntrust.com/funds#literature | |
| SMALL CAP VALUE FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | SMALL CAP VALUE FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOSGX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Small Cap Value Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 SMALL CAP VALUE FUND (SHARES/NOSGX) $ 1.00 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 51 | [1] |
| Expense Ratio, Percent | 1% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years SMALL CAP VALUE FUND (SHARES/NOSGX) 23.91 % 8.14 % 7.72 % RUSSELL 3000 ® 1 35.19 % 15.26 % 12.83 % RUSSELL 2000® VALUE INDEX 25.88 % 9.29 % 8.22 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Russell 2000 ® ® | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Material Change Date | Apr. 01, 2024 | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 1,054,689,000 | |
| Holdings Count | Holding | 512 | |
| Investment Company, Portfolio Turnover | 14.51% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 512 Portfolio turnover rate as of the end of the reporting period 14.51 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Financials 28.7 % Industrials 12.6 % Consumer Discretionary 10.4 % Real Estate 10.4 % Health Care 8.7 % Energy 7.8 % Information Technology 5.5 % Materials 5.2 % All other industries less than 5% 10.7 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| Material Fund Change [Text Block] | How Has the Fund Changed? This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete inf orma the northerntrust.com/funds#literature The Board of Trustees of Northern Funds has approved reductions in the Fund’s contractual expense limitation amount and management fee charged by Northern Trust Investments, Inc., the Fund’s investment adviser, effective January 1, 2025. Accordingly, effective January 1, 2025, the Fund’s contractual expense limitation and management fee will be 0.50% and 0.45%, respectively. | |
| Material Fund Change Expenses [Text Block] | The Board of Trustees of Northern Funds has approved reductions in the Fund’s contractual expense limitation amount and management fee charged by Northern Trust Investments, Inc., the Fund’s investment adviser, effective January 1, 2025. Accordingly, effective January 1, 2025, the Fund’s contractual expense limitation and management fee will be 0.50% and 0.45%, respectively. | |
| Summary of Change Legend [Text Block] | This is a summary of certain changes and planned changes to the Fund since April 1, 2024. For more complete inf orma the northerntrust.com/funds#literature | |
| Updated Prospectus Phone Number | 800-595-9111 | |
| Updated Prospectus Web Address | northerntrust.com/funds#literature | |
| INTERMEDIATE TAX-EXEMPT FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | INTERMEDIATE TAX-EXEMPT FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOITX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Intermediate Tax-Exempt Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 INTERMEDIATE TAX-EXEMPT FUND (SHARES/NOITX) $ 0.45 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 23 | [1] |
| Expense Ratio, Percent | 0.45% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years INTERMEDIATE TAX-EXEMPT FUND (SHARES/NOITX) 8.56 % 0.91 % 1.90 % BLOOMBERG U.S. MUNICIPAL BOND INDEX 1 10.37 % 1.39 % 2.52 % BLOOMBERG MUNICIPAL 1-15 YEAR INDEX 8.47 % 1.45 % 2.24 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg Municipal 1-15 Year Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 1,190,676,000 | |
| Holdings Count | Holding | 362 | |
| Investment Company, Portfolio Turnover | 26.04% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 362 Portfolio turnover rate as of the end of the reporting period 26.04 % | |
| Holdings [Text Block] | STATE ALLOCATION New York 14.6 % Florida 7.5 % Texas 6.8 % Illinois 5.6 % Washington 5.4 % All other states less than 5% 60.5 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MULTI-MANAGER GLOBAL LISTEDINFRASTRUCTURE FUND | |
| Class Name | SHARES | |
| Trading Symbol | NMFIX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Multi-Manager Global Listed Infrastructure Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND (SHARES/NMFIX) $ 0.96 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 51 | [1] |
| Expense Ratio, Percent | 0.96% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND (SHARES/NMFIX) 25.43 % 5.31 % 5.00 % MSCI ACWI INDEX 1 31.76 % 12.19 % 9.39 % S&P GLOBAL INFRASTRUCTURE INDEX 29.68 % 5.97 % 5.38 % 1 Effective July 31, 2024 | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 1,021,349,000 | |
| Holdings Count | Holding | 102 | |
| Investment Company, Portfolio Turnover | 20.34% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 102 Portfolio turnover rate as of the end of the reporting period 20.34 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY AS A United States Dollar 46.1 % Euro 19.2 % British Pound 14.1 % All other currencies less than 5% 19.8 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| INCOME EQUITY FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | INCOME EQUITY FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOIEX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Income Equity Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 INCOME EQUITY FUND (SHARES/NOIEX) $ 0.49 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 26 | [1] |
| Expense Ratio, Percent | 0.49% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years INCOME EQUITY FUND (SHARES/NOIEX) 35.64 % 14.31 % 11.69 % S&P 500 ® 36.35 % 15.98 % 13.38 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 208,928,000 | |
| Holdings Count | Holding | 153 | |
| Investment Company, Portfolio Turnover | 9.25% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 153 Portfolio turnover rate as of the end of the reporting period 9.25 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Information Technology 31.4 % Financials 11.3 % Health Care 9.8 % Communication Services 9.2 % Industrials 8.0 % Consumer Discretionary 7.8 % Consumer Staples 7.4 % All other industries less than 5% 15.0 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| INTERNATIONAL EQUITY FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | INTERNATIONAL EQUITY FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOIGX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the International Equity Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 INTERNATIONAL EQUITY FUND (SHARES/NOIGX) $ 0.50 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 26 | [1] |
| Expense Ratio, Percent | 0.50% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years INTERNATIONAL EQUITY FUND (SHARES/NOIGX) 23.93 % 8.20 % 4.62 % MSCI WORLD EX USA INDEX 24.98 % 8.36 % 5.68 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 146,681,000 | |
| Holdings Count | Holding | 220 | |
| Investment Company, Portfolio Turnover | 14.49% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 220 Portfolio turnover rate as of the end of the reporting period 14.49 % | |
| Holdings [Text Block] | CONCENTRATION BY CURRENCY AS A Euro 28.1 % Japanese Yen 19.5 % British Pound 12.9 % Canadian Dollar 10.2 % Swiss Franc 8.1 % Australian Dollar 5.6 % All other currencies less than 5% 14.3 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| FIXED INCOME FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | FIXED INCOME FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOFIX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Fixed Income Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 FIXED INCOME FUND (SHARES/NOFIX) $ 0.45 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 23 | [1] |
| Expense Ratio, Percent | 0.45% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years FIXED INCOME FUND (SHARES/NOFIX) 12.24 % 0.68 % 1.99 % BLOOMBERG U.S. AGGREGATE BOND INDEX 11.57 % 0.33 % 1.84 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 356,680,000 | |
| Holdings Count | Holding | 436 | |
| Investment Company, Portfolio Turnover | 61.69% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 436 Portfolio turnover rate as of the end of the reporting period 61.69 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Corporate Bonds 35.0 % U.S. Government Agencies 33.3 % U.S. Government Obligations 11.6 % Foreign Issuer Bonds 10.4 % Asset-Backed Securities 7.4 % Other less than 5% 2.0 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| U.S. GOVERNMENT FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | U.S. GOVERNMENT FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOUGX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the U.S. Government Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 U.S. GOVERNMENT FUND (SHARES/NOUGX) $ 0.44 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 23 | [1] |
| Expense Ratio, Percent | 0.44% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years U.S. GOVERNMENT FUND (SHARES/NOUGX) 8.59 % 0.56 % 1.21 % BLOOMBERG U.S. AGGREGATE BOND INDEX 1 11.57 % 0.33 % 1.84 % BLOOMBERG INTERMEDIATE U.S. GOVERNMENT BOND INDEX 8.33 % 0.84 % 1.50 % 1 Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg Intermediate U.S. Government Bond Index to the Bloomberg U.S. Aggregate Bond Index in connection with new regulatory requirements. | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 24,146,000 | |
| Holdings Count | Holding | 101 | |
| Investment Company, Portfolio Turnover | 17.13% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 101 Portfolio turnover rate as of the end of the reporting period 17.13 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS U.S. Government Obligations 93.9 % U.S. Government Agencies 5.2 % Other less than 5% 0.8 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| STOCK INDEX FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | STOCK INDEX FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOSIX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Stock Index Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 STOCK INDEX FUND (SHARES/NOSIX) $ 0.05 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 3 | [1] |
| Expense Ratio, Percent | 0.05% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years STOCK INDEX FUND (SHARES/NOSIX) 36.27 % 15.87 % 13.27 % S&P 500 ® 36.35 % 15.98 % 13.38 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 14,730,833,000 | |
| Holdings Count | Holding | 506 | |
| Investment Company, Portfolio Turnover | 2.09% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 506 Portfolio turnover rate as of the end of the reporting period 2.09 % | |
| Holdings [Text Block] | INDUSTRY SECTOR AS A % OF NET ASSETS Information Technology 31.6 % Financials 12.9 % Health Care 11.7 % Consumer Discretionary 10.1 % Communication Services 8.8 % Industrials 8.5 % Consumer Staples 5.8 % All other industries less than 5% 10.5 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| TAX-EXEMPT FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | TAX-EXEMPT FUND | |
| Class Name | SHARES | |
| Trading Symbol | NOTEX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Tax-Exempt Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 TAX-EXEMPT FUND (SHARES/NOTEX) $ 0.45 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 23 | [1] |
| Expense Ratio, Percent | 0.45% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | ||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years TAX-EXEMPT FUND (SHARES/NOTEX) 10.03 % 0.67 % 2.14 % BLOOMBERG U.S. MUNICIPAL INDEX 10.37 % 1.39 % 2.52 % | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 781,734,000 | |
| Holdings Count | Holding | 306 | |
| Investment Company, Portfolio Turnover | 18.56% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 306 Portfolio turnover rate as of the end of the reporting period 18.56 % | |
| Holdings [Text Block] | STATE ALLOCATION New York 12.1 % Texas 8.6 % Florida 8.3 % Colorado 6.6 % Massachusetts 5.4 % Illinois 5.0 % All other states less than 5% 55.3 % Figures in the above table may not sum to 100% due to the exclusions of other assets and liabilities. | |
| CALIFORNIA TAX-EXEMPT FUND | ||
| Shareholder Report [Line Items] | ||
| Fund Name | CALIFORNIA TAX-EXEMPT FUND | |
| Class Name | SHARES | |
| Trading Symbol | NCATX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the California Tax-Exempt Fund (the “Fund”) for the period of April 1, 2024 | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at northerntrust.com/funds#literature | |
| Additional Information Phone Number | 800-595-9111 | |
| Additional Information Website | northerntrust.com/funds#literature | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment 1 Costs paid as a percentage of a $10,000 investment 1,2 CALIFORNIA TAX-EXEMPT FUND (SHARES/NCATX) $ 0.46 % 1 Reflects applicable expense reimbursements and fee waivers. 2 Expense ratio is expressed on an annualized basis. | |
| Expenses Paid, Amount | $ 23 | [1] |
| Expense Ratio, Percent | 0.46% | [1],[2] |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |
| Line Graph [Table Text Block] | Index returns may not be visible due to high correlation with the Fund’s returns. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 year 5 years 10 years CALIFORNIA TAX-EXEMPT FUND (SHARES/NCATX) 10.00 % 0.77 % 2.27 % BLOOMBERG U.S. MUNICIPAL BOND INDEX 2 10.37 % 1.39 % 2.52 % BLOOMBERG CALIFORNIA MUNICIPAL BOND INDEX 9.87 % 1.32 % 2.48 % 1 Index returns may not be visible due to high correlation with the Fund’s returns. 2 Effective July 31, 2024, the Fund changed its broad-based securities market index from Index | |
| No Deduction of Taxes [Text Block] | The graph and table above do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |
| Updated Performance Information Location [Text Block] | Performance data current to the most recent month-end is available at northerntrust.com/funds#performance | |
| Net Assets | $ 150,642,000 | |
| Holdings Count | Holding | 132 | |
| Investment Company, Portfolio Turnover | 23.19% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS Fund net assets (in thousands) $ Total number of portfolio holdings 132 Portfolio turnover rate as of the end of the reporting period 23.19 % | |
| Holdings [Text Block] | TYPE OF SECURITY AS A % OF NET ASSETS Revenue Bonds 59.3 % General Obligation Unlimited Bonds 37.2 % Certificates of Participation 2.7 % Money Market Funds 2.3 % Special Tax Bonds 1.2 % Tax Allocation Bonds 0.7 % Figures in the above table may not sum to 100% due to the exclusions of other asset and liabilities. | |
| [1]Reflects applicable expense reimbursements and fee waivers.[2]Expense ratio is expressed on an annualized basis.[3]Expense ratio reflects only the direct expenses of the Fund and not any expenses associated with the underlying funds. | ||
| Shareholder Report, Line Graph (Details) - USD ($) | 6 Months Ended | |||||||||||||
| Sep. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Oct. 02, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014 | ||
| CALIFORNIA TAX-EXEMPT FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | CALIFORNIA TAX-EXEMPT FUND (SHARES/NCATX) | |||||||||||||
| Account Value | [1] | $ 13,221 | $ 12,856 | $ 12,443 | $ 12,574 | $ 13,285 | $ 12,733 | $ 12,212 | $ 11,630 | $ 11,323 | $ 11,418 | $ 10,878 | $ 10,000 | |
| TAX-EXEMPT FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | TAX-EXEMPT FUND (SHARES/NOTEX) | |||||||||||||
| Account Value | $ 12,926 | 12,519 | 12,177 | 12,441 | 13,063 | 12,504 | 11,985 | 11,439 | 11,149 | 11,167 | 10,708 | 10,000 | ||
| STOCK INDEX FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | STOCK INDEX FUND (SHARES/NOSIX) | |||||||||||||
| Account Value | [1] | $ 36,965 | 33,489 | 25,797 | 27,986 | 24,227 | 15,508 | 16,695 | 15,263 | 13,404 | 11,450 | 11,259 | 10,000 | |
| U.S. GOVERNMENT FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | U.S. GOVERNMENT FUND (SHARES/NOUGX) | |||||||||||||
| Account Value | $ 11,400 | 10,886 | 10,708 | 10,900 | 11,413 | 11,596 | 10,669 | 10,329 | 10,393 | 10,527 | 10,323 | 10,000 | ||
| FIXED INCOME FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | FIXED INCOME FUND (SHARES/NOFIX) | |||||||||||||
| Account Value | $ 12,452 | 11,797 | 11,542 | 12,181 | 12,635 | 11,962 | 11,380 | 10,945 | 10,792 | 10,627 | 10,573 | 10,000 | ||
| INTERNATIONAL EQUITY FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | INTERNATIONAL EQUITY FUND (SHARES/NOIGX) | |||||||||||||
| Account Value | $ 15,216 | 14,113 | 12,264 | 12,267 | 11,854 | 8,259 | 10,425 | 11,038 | 9,706 | 8,565 | 9,709 | 10,000 | ||
| INCOME EQUITY FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | INCOME EQUITY FUND (SHARES/NOIEX) | |||||||||||||
| Account Value | $ 31,128 | 27,945 | 22,084 | 23,692 | 20,368 | 13,276 | 15,148 | 14,070 | 12,554 | 11,116 | 10,940 | 10,000 | ||
| MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND (SHARES/NMFIX) | |||||||||||||
| Account Value | $ 16,907 | 15,105 | 14,784 | 15,469 | 13,879 | 11,031 | 12,407 | 11,902 | 11,164 | 9,883 | 10,064 | 10,000 | ||
| INTERMEDIATE TAX-EXEMPT FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | INTERMEDIATE TAX-EXEMPT FUND (SHARES/NOITX) | |||||||||||||
| Account Value | $ 12,439 | 12,092 | 11,814 | 11,851 | 12,390 | 11,912 | 11,485 | 10,995 | 10,803 | 10,856 | 10,486 | 10,000 | ||
| SMALL CAP VALUE FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | SMALL CAP VALUE FUND (SHARES/NOSGX) | |||||||||||||
| Account Value | $ 20,002 | 19,026 | 16,019 | 17,317 | 16,766 | 9,463 | 13,211 | 13,271 | 12,790 | 10,330 | 10,779 | 10,000 | ||
| HIGH YIELD MUNICIPAL FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | HIGH YIELD MUNICIPAL FUND (SHARES/NHYMX) | |||||||||||||
| Account Value | $ 13,595 | 12,945 | 12,270 | 13,268 | 13,858 | 12,398 | 12,485 | 11,952 | 11,485 | 11,498 | 10,970 | 10,000 | ||
| MID CAP INDEX FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MID CAP INDEX FUND (SHARES/NOMIX) | |||||||||||||
| Account Value | [1] | $ 26,345 | 25,531 | 20,714 | 21,868 | 20,939 | 11,426 | 14,764 | 14,421 | 13,015 | 10,783 | 11,198 | 10,000 | |
| LARGE CAP CORE FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | LARGE CAP CORE FUND (SHARES/NOLCX) | |||||||||||||
| Account Value | $ 33,241 | 30,219 | 22,987 | 24,715 | 21,092 | 13,554 | 15,276 | 14,487 | 12,671 | 11,057 | 11,081 | 10,000 | ||
| EMERGING MARKETS EQUITY INDEX FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | EMERGING MARKETS EQUITY INDEX FUND (SHARES/NOEMX) | |||||||||||||
| Account Value | $ 14,439 | 12,771 | 11,938 | 13,308 | 15,243 | 9,616 | 11,779 | 12,850 | 10,278 | 8,762 | 10,000 | 10,000 | ||
| ACTIVE M INTERNATIONAL EQUITY FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ACTIVE M INTERNATIONAL EQUITY FUND (SHARES/NMIEX) | |||||||||||||
| Account Value | $ 17,583 | 16,518 | 14,117 | 14,039 | 14,187 | 8,888 | 10,773 | 11,388 | 9,548 | 8,819 | 9,773 | 10,000 | ||
| BOND INDEX FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BOND INDEX FUND (SHARES/NOBOX) | |||||||||||||
| Account Value | $ 12,132 | 11,522 | 11,340 | 11,911 | 12,435 | 12,390 | 11,366 | 10,896 | 10,772 | 10,758 | 10,558 | 10,000 | ||
| LIMITED TERM U.S. GOVERNMENT FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | LIMITED TERM U.S. GOVERNMENT FUND (SHARES/NSIUX) | |||||||||||||
| Account Value | $ 11,179 | 10,731 | 10,508 | 10,573 | 11,066 | 11,095 | 10,430 | 10,179 | 10,235 | 10,314 | 10,174 | 10,000 | ||
| LIMITED TERM TAX-EXEMPT FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | LIMITED TERM TAX-EXEMPT FUND (SHARES/NSITX) | |||||||||||||
| Account Value | $ 11,522 | 11,226 | 11,030 | 10,860 | 11,205 | 10,828 | 10,608 | 10,272 | 10,264 | 10,274 | 10,131 | 10,000 | ||
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS K | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | GLOBAL SUSTAINABILITY INDEX FUND (CLASS K/NSRKX) | |||||||||||||
| Account Value | [1] | $ 27,337 | 25,244 | 19,846 | 21,264 | 19,247 | 12,687 | 13,792 | 13,201 | 11,644 | 10,254 | 10,583 | 10,000 | |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS I | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | GLOBAL SUSTAINABILITY INDEX FUND (CLASS I/NSRIX) | |||||||||||||
| Account Value | [1] | $ 27,276 | 25,186 | 19,815 | 21,243 | 19,230 | 12,685 | 13,791 | 13,200 | 11,642 | 10,253 | 10,582 | 10,000 | |
| Active M Emerging Markets Equity Fund | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ACTIVE M EMERGING MARKETS EQUITY FUND (SHARES/NMMEX) | |||||||||||||
| Account Value | $ 14,096 | 12,931 | 11,701 | 13,311 | 14,731 | 9,062 | 11,156 | 12,809 | 10,230 | 8,543 | 9,720 | 10,000 | ||
| Multi-Manager Global Real Estate Fund | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MULTI-MANAGER GLOBAL REAL ESTATE FUND (SHARES/NMMGX) | |||||||||||||
| Account Value | $ 15,987 | 14,469 | 13,463 | 16,753 | 14,565 | 10,903 | 13,438 | 11,862 | 11,414 | 11,112 | 11,276 | 10,000 | ||
| TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND (SHARES/NTAUX) | |||||||||||||
| Account Value | [1] | $ 11,564 | 11,272 | 10,808 | 10,645 | 10,798 | 10,626 | 10,458 | 10,248 | 10,186 | 10,092 | 10,051 | 10,000 | |
| ULTRA-SHORT FIXED INCOME FUND - SIEBERT WILLIAMS SHANK SHARES | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ULTRA-SHORT FIXED INCOME FUND (SIEBERT WILLIAMS SHANK SHARES/SWSFX) | |||||||||||||
| Account Value | $ 12,352 | 11,963 | 11,215 | 11,027 | 11,189 | 10,829 | 10,674 | 10,390 | 10,291 | 10,144 | 10,075 | 10,000 | ||
| ULTRA-SHORT FIXED INCOME FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ULTRA-SHORT FIXED INCOME FUND (SHARES/NUSFX) | |||||||||||||
| Account Value | $ 12,352 | 11,963 | 11,215 | 11,027 | 11,189 | 10,829 | 10,674 | 10,390 | 10,291 | 10,144 | 10,075 | 10,000 | ||
| CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND (SHARES/NCITX) | |||||||||||||
| Account Value | $ 12,451 | 12,077 | 11,801 | 11,848 | 12,499 | 11,983 | 11,622 | 11,093 | 10,909 | 11,005 | 10,579 | 10,000 | ||
| ARIZONA TAX-EXEMPT FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ARIZONA TAX-EXEMPT FUND (SHARES/NOAZX) | |||||||||||||
| Account Value | $ 12,647 | 12,295 | 11,972 | 12,075 | 12,677 | 12,284 | 11,827 | 11,249 | 11,032 | 11,051 | 10,619 | 10,000 | ||
| U.S. QUALITY ESG FUND - CLASS K | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | U.S. QUALITY ESG FUND (CLASS K/NUESX) | |||||||||||||
| Account Value | $ 25,159 | 23,113 | 18,048 | 19,554 | 17,196 | 10,706 | 11,473 | 10,517 | $ 10,000 | |||||
| U.S. QUALITY ESG FUND - CLASS I | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | U.S. QUALITY ESG FUND (CLASS I/NUEIX) | |||||||||||||
| Account Value | $ 25,062 | 23,049 | 18,006 | 19,528 | 17,188 | 10,706 | 11,473 | 10,517 | 10,000 | |||||
| SMALL CAP INDEX FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | SMALL CAP INDEX FUND (SHARES/NSIDX) | |||||||||||||
| Account Value | [1] | $ 21,603 | 20,450 | 17,101 | 19,363 | 20,574 | 10,583 | 13,977 | 13,707 | 12,273 | 9,733 | 10,802 | 10,000 | |
| MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND (SHARES/NMHYX) | |||||||||||||
| Account Value | $ 15,609 | 14,814 | 13,350 | 13,877 | 13,732 | 10,877 | 12,180 | 11,739 | 11,260 | 9,590 | 10,115 | 10,000 | ||
| GLOBAL TACTICAL ASSET ALLOCATION FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | GLOBAL TACTICAL ASSET ALLOCATION FUND (SHARES/BBALX) | |||||||||||||
| Account Value | $ 16,801 | 15,633 | 14,219 | 15,171 | 14,598 | 11,064 | 12,312 | 12,134 | 11,178 | 10,200 | 10,251 | 10,000 | ||
| SHORT BOND FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | SHORT BOND FUND (SHARES/BSBAX) | |||||||||||||
| Account Value | [1] | $ 11,884 | 11,427 | 11,010 | 10,993 | 11,318 | 10,845 | 10,623 | 10,313 | 10,265 | 10,120 | 10,079 | 10,000 | |
| CORE BOND FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | CORE BOND FUND (SHARES/NOCBX) | |||||||||||||
| Account Value | $ 12,134 | 11,523 | 11,314 | 11,904 | 12,425 | 12,053 | 11,309 | 10,901 | 10,742 | 10,706 | 10,601 | 10,000 | ||
| HIGH YIELD FIXED INCOME FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | HIGH YIELD FIXED INCOME FUND (SHARES/NHFIX) | |||||||||||||
| Account Value | $ 15,553 | 14,608 | 13,120 | 13,684 | 13,769 | 10,720 | 11,910 | 11,385 | 10,908 | 9,649 | 10,093 | 10,000 | ||
| SMALL CAP CORE FUND - CLASS K | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | SMALL CAP CORE FUND (CLASS K/NSCKX) | |||||||||||||
| Account Value | $ 23,100 | 21,872 | 18,115 | 19,707 | 19,813 | 10,756 | 13,932 | 13,702 | 12,382 | 10,021 | 11,033 | 10,000 | ||
| SMALL CAP CORE FUND - CLASS I | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | SMALL CAP CORE FUND (CLASS I/NSGRX) | |||||||||||||
| Account Value | $ 23,010 | 21,792 | 18,066 | 19,675 | 19,801 | 10,756 | 13,933 | 13,703 | 12,383 | 10,021 | 11,033 | 10,000 | ||
| U.S. TREASURY INDEX FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | U.S. TREASURY INDEX FUND (SHARES/BTIAX) | |||||||||||||
| Account Value | [1] | $ 11,429 | 10,907 | 10,918 | 11,453 | 11,887 | 12,498 | 11,031 | 10,604 | 10,577 | 10,753 | 10,517 | 10,000 | |
| U.S. GOVERNMENT SELECT MONEY MARKET FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | U.S. GOVERNMENT SELECT MONEY MARKET FUND (SHARES/NOSXX) | |||||||||||||
| Account Value | $ 11,551 | 11,265 | 10,719 | 10,479 | 10,453 | 10,450 | 10,276 | 10,096 | 10,017 | 10,003 | 10,001 | 10,000 | ||
| LARGE CAP VALUE FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | LARGE CAP VALUE FUND (SHARES/NOLVX) | |||||||||||||
| Account Value | $ 24,364 | 23,211 | 19,176 | 20,223 | 17,896 | 11,115 | 13,921 | 13,193 | 12,395 | 10,391 | 11,039 | 10,000 | ||
| INTERNATIONAL EQUITY INDEX FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | INTERNATIONAL EQUITY INDEX FUND (SHARES/NOINX) | |||||||||||||
| Account Value | $ 17,003 | 15,916 | 13,804 | 13,819 | 13,801 | 9,569 | 11,176 | 11,646 | 10,122 | 9,032 | 9,871 | 10,000 | ||
| GLOBAL REAL ESTATE INDEX FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | GLOBAL REAL ESTATE INDEX FUND (SHARES/NGREX) | |||||||||||||
| Account Value | [1] | $ 15,694 | 13,825 | 12,714 | 16,040 | 14,342 | 10,764 | 13,819 | 12,500 | 11,672 | 11,353 | 11,382 | 10,000 | |
| U.S. GOVERNMENT MONEY MARKET FUND | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | U.S. GOVERNMENT MONEY MARKET FUND (SHARES/NOGXX) | |||||||||||||
| Account Value | $ 11,513 | 11,229 | 10,687 | 10,451 | 10,450 | 10,447 | 10,273 | 10,092 | 10,014 | 10,002 | 10,001 | 10,000 | ||
| BLOOMBERG U.S. MUNICIPAL BOND INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. MUNICIPAL BOND INDEX | |||||||||||||
| Account Value | [1] | $ 13,350 | 13,000 | 12,606 | 12,573 | 13,161 | 12,474 | 12,012 | 11,398 | 11,103 | 11,086 | 10,662 | 10,000 | |
| BLOOMBERG U.S. MUNICIPAL INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. MUNICIPAL INDEX | |||||||||||||
| Account Value | $ 13,350 | 13,000 | 12,606 | 12,573 | 13,161 | 12,474 | 12,012 | 11,398 | 11,103 | 11,086 | 10,662 | 10,000 | ||
| MSCI WORLD EX USA INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI WORLD EX USA INDEX | |||||||||||||
| Account Value | $ 17,131 | 15,994 | 13,873 | 14,264 | 13,843 | 9,490 | 11,151 | 11,512 | 10,106 | 9,029 | 9,861 | 10,000 | ||
| Standard & Poor's 500 Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500® INDEX | |||||||||||||
| Account Value | $ 37,352 | 33,826 | 26,044 | 28,225 | 24,407 | 15,610 | 16,781 | 15,326 | 13,445 | 11,474 | 11,273 | 10,000 | ||
| RUSSELL 3000 INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | RUSSELL 3000® INDEX | |||||||||||||
| Account Value | $ 35,064 | 31,980 | 24,734 | 27,056 | 24,173 | 14,873 | 16,367 | 15,048 | 13,221 | 11,198 | 11,237 | 10,000 | ||
| MSCI EM (EMERGING MARKETS) INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI EM (EMERGING MARKETS) INDEX | |||||||||||||
| Account Value | $ 15,263 | 13,370 | 12,362 | 13,844 | 15,619 | 9,861 | 11,980 | 12,939 | 10,357 | 8,836 | 10,044 | 10,000 | ||
| MSCI WORLD EX USA IMI INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI WORLD EX USA IMI INDEX | |||||||||||||
| Account Value | $ 17,093 | 15,925 | 13,901 | 14,458 | 14,131 | 9,518 | 11,261 | 11,727 | 10,202 | 9,119 | 9,817 | 10,000 | ||
| BLOOMBERG U.S. AGGREGATE BOND INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. AGGREGATE BOND INDEX | |||||||||||||
| Account Value | [1] | $ 12,270 | 11,657 | 11,462 | 12,038 | 12,559 | 12,471 | 11,448 | 10,957 | 10,827 | 10,779 | 10,572 | 10,000 | |
| MSCI WORLD INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI WORLD INDEX | |||||||||||||
| Account Value | [1] | $ 26,791 | 24,542 | 19,616 | 21,098 | 19,159 | 12,438 | 13,880 | 13,345 | 11,748 | 10,237 | 10,603 | 10,000 | |
| BLOOMBERG GLOBAL AGGREGATE BOND INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG GLOBAL AGGREGATE BOND INDEX | |||||||||||||
| Account Value | $ 10,508 | 9,931 | 9,883 | 10,750 | 11,485 | 10,973 | 10,531 | 10,571 | 9,882 | 10,074 | 9,634 | 10,000 | ||
| RUSSELL 1000 INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | RUSSELL 1000® INDEX | |||||||||||||
| Account Value | $ 25,195 | 22,932 | 17,658 | 19,276 | 17,017 | 10,597 | 11,522 | 10,541 | $ 10,000 | |||||
| BLOOMBERG UNIVERSAL INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG UNIVERSAL INDEX | |||||||||||||
| Account Value | $ 12,641 | 11,993 | 11,681 | 12,246 | 12,787 | 12,420 | 11,591 | 11,089 | 10,923 | 10,717 | 10,532 | 10,000 | ||
| MSCI ACWI INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI INDEX | |||||||||||||
| Account Value | $ 26,791 | 24,542 | 19,616 | 21,098 | 19,159 | 12,438 | 13,880 | 13,345 | 11,748 | 10,237 | 10,603 | 10,000 | ||
| MSCI EAFE INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI EAFE INDEX | |||||||||||||
| Account Value | $ 17,065 | 15,977 | 13,855 | 14,049 | 13,887 | 9,606 | 11,219 | 11,652 | 10,150 | 9,089 | 9,908 | 10,000 | ||
| MSCI WORLD INDEX NET [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI WORLD INDEX | |||||||||||||
| Account Value | [1] | $ 26,791 | 24,542 | 19,616 | 21,098 | 19,159 | 12,438 | 13,880 | 13,345 | 11,748 | 10,237 | 10,603 | 10,000 | |
| BLOOMBERG CALIFORNIA MUNICIPAL BOND INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG CALIFORNIA MUNICIPAL BOND INDEX | |||||||||||||
| Account Value | [1] | $ 13,356 | 13,022 | 12,625 | 12,537 | 13,155 | 12,534 | 12,028 | 11,446 | 11,125 | 11,144 | 10,713 | 10,000 | |
| BLOOMBERG INTERMEDIATE U.S. GOVERNMENT BOND INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG INTERMEDIATE U.S. GOVERNMENT BOND INDEX | |||||||||||||
| Account Value | $ 11,716 | 11,206 | 11,024 | 11,194 | 11,680 | 11,823 | 10,854 | 10,458 | 10,473 | 10,543 | 10,315 | 10,000 | ||
| S&P GLOBAL INFRASTRUCTURE INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P GLOBAL INFRASTRUCTURE INDEX | |||||||||||||
| Account Value | $ 17,551 | 15,152 | 14,694 | 15,347 | 13,245 | 9,740 | 12,473 | 11,528 | 11,064 | 9,995 | 10,393 | 10,000 | ||
| BLOOMBERG MUNICIPAL 1 To 15 YEAR INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG MUNICIPAL 1-15 YEAR INDEX | |||||||||||||
| Account Value | $ 12,866 | 12,582 | 12,260 | 12,067 | 12,596 | 12,006 | 11,622 | 11,059 | 10,862 | 10,852 | 10,489 | 10,000 | ||
| RUSSELL 2000 VALUE INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | RUSSELL 2000® VALUE INDEX | |||||||||||||
| Account Value | $ 20,631 | 19,438 | 16,369 | 18,805 | 18,201 | 9,236 | 13,128 | 13,105 | 12,466 | 9,636 | 10,443 | 10,000 | ||
| BLOOMBERG MUNICIPAL BOND 60% HIGH YIELD/40% INVESTMENT GRADE INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG MUNICIPAL BOND 60% HIGH YIELD/40% INVESTMENT GRADE INDEX | |||||||||||||
| Account Value | $ 15,205 | 14,537 | 13,717 | 14,083 | 14,460 | 13,010 | 12,862 | 12,017 | 11,481 | 11,185 | 10,787 | 10,000 | ||
| S&P MIDCAP 400® INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P MIDCAP 400® INDEX | |||||||||||||
| Account Value | [1] | $ 26,750 | 25,905 | 21,005 | 22,139 | 21,168 | 11,538 | 14,890 | 14,514 | 13,079 | 10,816 | 11,220 | 10,000 | |
| BLOOMBERG 1-5 YEAR U.S. GOVERNMENT INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG 1-5 YEAR U.S. GOVERNMENT INDEX | |||||||||||||
| Account Value | $ 11,622 | 11,153 | 10,887 | 10,926 | 11,375 | 11,377 | 10,648 | 10,321 | 10,331 | 10,344 | 10,182 | 10,000 | ||
| BLOOMBERG 1-5 YEAR BLEND MUNICIPAL BOND INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG 1-5 YEAR BLEND MUNICIPAL BOND INDEX | |||||||||||||
| Account Value | $ 13,350 | 11,450 | 11,224 | 11,049 | 11,428 | 11,022 | 10,808 | 10,462 | 10,406 | 10,352 | 10,172 | 10,000 | ||
| MSCI WORLD ESG LEADERS INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI WORLD ESG LEADERS INDEX | |||||||||||||
| Account Value | [1] | $ 27,002 | 24,941 | 19,617 | 21,132 | 19,077 | 12,588 | 13,704 | 13,118 | 11,596 | 10,250 | 10,572 | 10,000 | |
| FTSE EPRA NAREIT DEVELOPED INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | FTSE EPRA NAREIT DEVELOPED INDEX | |||||||||||||
| Account Value | $ 15,293 | 13,505 | 12,573 | 15,996 | 13,973 | 10,378 | 13,648 | 12,050 | 11,673 | 11,565 | 11,518 | 10,000 | ||
| ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX | |||||||||||||
| Account Value | [1] | $ 11,327 | 11,099 | 10,794 | 10,611 | 10,650 | 10,527 | 10,386 | 10,199 | 10,129 | 10,062 | 10,026 | 10,000 | |
| ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX | |||||||||||||
| Account Value | [1] | $ 11,432 | 11,140 | 10,897 | 10,747 | 10,987 | 10,723 | 10,542 | 10,285 | 10,238 | 10,173 | 10,071 | 10,000 | |
| Seventy Five% ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX AND 25% ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | 75% ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX AND 25% ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX | |||||||||||||
| Account Value | [1] | $ 11,356 | 11,112 | 10,821 | 10,646 | 10,735 | 10,577 | 10,426 | 10,221 | 10,157 | 10,091 | 10,039 | 10,000 | |
| ICE BofA 1-YEAR U.S. TREASURY NOTE INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ICE BofA 1-YEAR U.S. TREASURY NOTE INDEX | |||||||||||||
| Account Value | $ 11,685 | 11,327 | 10,860 | 10,750 | 10,852 | 10,833 | 10,433 | 10,185 | 10,118 | 10,062 | 10,021 | 10,000 | ||
| BLOOMBERG CALIFORNIA INTERMEDIATE MUNICIPAL BOND INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG CALIFORNIA INTERMEDIATE MUNICIPAL BOND INDEX | |||||||||||||
| Account Value | $ 12,651 | 12,382 | 12,135 | 11,853 | 12,495 | 11,964 | 11,599 | 11,004 | 10,846 | 10,890 | 10,502 | 10,000 | ||
| BLOOMBERG ARIZONA MUNICIPAL BOND INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG ARIZONA MUNICIPAL BOND INDEX | |||||||||||||
| Account Value | $ 13,350 | 12,764 | 12,400 | 12,434 | 13,014 | 12,316 | 11,940 | 11,361 | 11,115 | 11,090 | 10,666 | 10,000 | ||
| ICE BofA U.S. HIGH YIELD CONSTRAINED INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. HIGH YIELD CONSTRAINED INDEX | |||||||||||||
| Account Value | $ 16,305 | 15,321 | 13,795 | 14,307 | 14,349 | 11,645 | 12,584 | 11,880 | 11,456 | 9,802 | 10,206 | 10,000 | ||
| BLENDED INDEX (60% MSCI ALL COUNTRY WORLD INDEX AND 40% BLOOMBERG U.S. AGGREGATE BOND INDEX) [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLENDED INDEX (60% MSCI ALL COUNTRY WORLD INDEX AND 40% BLOOMBERG U.S. AGGREGATE BOND INDEX) | |||||||||||||
| Account Value | $ 19,317 | 17,902 | 15,666 | 16,691 | 16,253 | 12,431 | 12,833 | 12,388 | 11,334 | 10,504 | 10,563 | 10,000 | ||
| BLOOMBERG 1-3 YEAR U.S. GOVERNMENT/CREDIT INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG 1-3 YEAR U.S. GOVERNMENT/CREDIT INDEX | |||||||||||||
| Account Value | [1] | $ 12,270 | 11,367 | 10,984 | 10,955 | 11,283 | 11,108 | 10,627 | 10,315 | 10,291 | 10,218 | 10,112 | 10,000 | |
| BLOOMBERG U.S. CORPORATE HIGH YIELD 2% ISSUER CAPPED INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. CORPORATE HIGH YIELD 2% ISSUER CAPPED INDEX | |||||||||||||
| Account Value | $ 16,434 | 15,440 | 13,891 | 14,373 | 14,469 | 11,702 | 12,574 | 11,870 | 11,438 | 9,827 | 10,200 | 10,000 | ||
| RUSSELL 2000 INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | RUSSELL 2000® INDEX | |||||||||||||
| Account Value | $ 21,942 | 20,761 | 17,343 | 19,620 | 20,825 | 10,688 | 14,061 | 13,779 | 12,325 | 9,765 | 10,821 | 10,000 | ||
| BLOOMBERG U.S. TREASURY INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. TREASURY INDEX | |||||||||||||
| Account Value | [1] | $ 11,620 | 11,084 | 11,078 | 11,601 | 12,043 | 12,601 | 11,129 | 10,679 | 10,633 | 10,788 | 10,536 | 10,000 | |
| RUSSEL 1000 VALUE INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | RUSSELL 1000® VALUE INDEX | |||||||||||||
| Account Value | $ 25,369 | 23,696 | 19,703 | 20,941 | 18,753 | 12,014 | 14,504 | 13,726 | 12,834 | 10,765 | 10,933 | 10,000 | ||
| MSCI ACWI IMI CORE REAL ESTATE INDEX [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI IMI CORE REAL ESTATE INDEX | |||||||||||||
| Account Value | [1] | $ 15,584 | $ 13,726 | $ 12,653 | $ 16,148 | $ 14,414 | $ 10,871 | $ 13,997 | $ 12,682 | $ 11,871 | $ 11,601 | $ 11,510 | $ 10,000 | |
| [1]Index returns may not be visible due to high correlation with the Fund’s returns. | ||||||||||||||
| Shareholder Report, Average Annual Return (Details) | 6 Months Ended | 12 Months Ended | 60 Months Ended | 84 Months Ended | 120 Months Ended | ||||
| Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | |||||
| CALIFORNIA TAX-EXEMPT FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | CALIFORNIA TAX-EXEMPT FUND (SHARES/NCATX) | ||||||||
| Average Annual Return, Percent | 10% | 0.77% | 2.27% | ||||||
| TAX-EXEMPT FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | TAX-EXEMPT FUND (SHARES/NOTEX) | ||||||||
| Average Annual Return, Percent | 10.03% | 0.67% | 2.14% | ||||||
| STOCK INDEX FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | STOCK INDEX FUND (SHARES/NOSIX) | ||||||||
| Average Annual Return, Percent | 36.27% | 15.87% | 13.27% | ||||||
| U.S. GOVERNMENT FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | U.S. GOVERNMENT FUND (SHARES/NOUGX) | ||||||||
| Average Annual Return, Percent | 8.59% | 0.56% | 1.21% | ||||||
| FIXED INCOME FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | FIXED INCOME FUND (SHARES/NOFIX) | ||||||||
| Average Annual Return, Percent | 12.24% | 0.68% | 1.99% | ||||||
| INTERNATIONAL EQUITY FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | INTERNATIONAL EQUITY FUND (SHARES/NOIGX) | ||||||||
| Average Annual Return, Percent | 23.93% | 8.20% | 4.62% | ||||||
| INCOME EQUITY FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | INCOME EQUITY FUND (SHARES/NOIEX) | ||||||||
| Average Annual Return, Percent | 35.64% | 14.31% | 11.69% | ||||||
| MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND (SHARES/NMFIX) | ||||||||
| Average Annual Return, Percent | 25.43% | 5.31% | 5% | ||||||
| INTERMEDIATE TAX-EXEMPT FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | INTERMEDIATE TAX-EXEMPT FUND (SHARES/NOITX) | ||||||||
| Average Annual Return, Percent | 8.56% | 0.91% | 1.90% | ||||||
| SMALL CAP VALUE FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | SMALL CAP VALUE FUND (SHARES/NOSGX) | ||||||||
| Average Annual Return, Percent | 23.91% | 8.14% | 7.72% | ||||||
| HIGH YIELD MUNICIPAL FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | HIGH YIELD MUNICIPAL FUND (SHARES/NHYMX) | ||||||||
| Average Annual Return, Percent | 14.83% | 0.73% | 2.51% | ||||||
| MID CAP INDEX FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MID CAP INDEX FUND (SHARES/NOMIX) | ||||||||
| Average Annual Return, Percent | 26.66% | 11.64% | 10.17% | ||||||
| LARGE CAP CORE FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | LARGE CAP CORE FUND (SHARES/NOLCX) | ||||||||
| Average Annual Return, Percent | 37.30% | 16.04% | 12.11% | ||||||
| EMERGING MARKETS EQUITY INDEX FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | EMERGING MARKETS EQUITY INDEX FUND (SHARES/NOEMX) | ||||||||
| Average Annual Return, Percent | 24.58% | 4.92% | 3.46% | ||||||
| ACTIVE M INTERNATIONAL EQUITY FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | ACTIVE M INTERNATIONAL EQUITY FUND (SHARES/NMIEX) | ||||||||
| Average Annual Return, Percent | 25.66% | 9.85% | 5.98% | ||||||
| BOND INDEX FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BOND INDEX FUND (SHARES/NOBOX) | ||||||||
| Average Annual Return, Percent | 11.53% | 0.24% | 1.73% | ||||||
| LIMITED TERM U.S. GOVERNMENT FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | LIMITED TERM U.S. GOVERNMENT FUND (SHARES/NSIUX) | ||||||||
| Average Annual Return, Percent | 7.21% | 0.84% | 1.06% | ||||||
| LIMITED TERM TAX-EXEMPT FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | LIMITED TERM TAX-EXEMPT FUND (SHARES/NSITX) | ||||||||
| Average Annual Return, Percent | 6.13% | 1.34% | 1.33% | ||||||
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS K | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | GLOBAL SUSTAINABILITY INDEX FUND (CLASS K/NSRKX) | ||||||||
| Average Annual Return, Percent | 33.21% | 13.41% | 10.32% | ||||||
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS I | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | GLOBAL SUSTAINABILITY INDEX FUND (CLASS I/NSRIX) | ||||||||
| Average Annual Return, Percent | 33.12% | 13.36% | 10.30% | ||||||
| Active M Emerging Markets Equity Fund | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | ACTIVE M EMERGING MARKETS EQUITY FUND (SHARES/NMMEX) | ||||||||
| Average Annual Return, Percent | 22.39% | 5.02% | 3.30% | ||||||
| Multi-Manager Global Real Estate Fund | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MULTI-MANAGER GLOBAL REAL ESTATE FUND (SHARES/NMMGX) | ||||||||
| Average Annual Return, Percent | 26.27% | 2.36% | 4.70% | ||||||
| TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND (SHARES/NTAUX) | ||||||||
| Average Annual Return, Percent | 5.18% | 1.80% | 1.43% | ||||||
| ULTRA-SHORT FIXED INCOME FUND - SIEBERT WILLIAMS SHANK SHARES | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | ULTRA-SHORT FIXED INCOME FUND (SIEBERT WILLIAMS SHANK SHARES/SWSFX) | ||||||||
| Average Annual Return, Percent | 6.85% | 2.58% | 2.10% | ||||||
| ULTRA-SHORT FIXED INCOME FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | ULTRA-SHORT FIXED INCOME FUND (SHARES/NUSFX) | ||||||||
| Average Annual Return, Percent | 6.85% | 2.58% | 2.10% | ||||||
| CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND (SHARES/NCITX) | ||||||||
| Average Annual Return, Percent | 9.01% | 0.73% | 1.83% | ||||||
| ARIZONA TAX-EXEMPT FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | ARIZONA TAX-EXEMPT FUND (SHARES/NOAZX) | ||||||||
| Average Annual Return, Percent | 9.67% | 0.64% | 1.98% | ||||||
| U.S. QUALITY ESG FUND - CLASS K | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | U.S. QUALITY ESG FUND (CLASS K/NUESX) | ||||||||
| Average Annual Return, Percent | 32.35% | 15.77% | 14.10% | ||||||
| U.S. QUALITY ESG FUND - CLASS I | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | U.S. QUALITY ESG FUND (CLASS I/NUEIX) | ||||||||
| Average Annual Return, Percent | 32.17% | 15.68% | 14.04% | ||||||
| SMALL CAP INDEX FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | SMALL CAP INDEX FUND (SHARES/NSIDX) | ||||||||
| Average Annual Return, Percent | 26.64% | 9.21% | 8.63% | ||||||
| MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND (SHARES/NMHYX) | ||||||||
| Average Annual Return, Percent | 14.35% | 4.69% | 4.52% | ||||||
| GLOBAL TACTICAL ASSET ALLOCATION FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | GLOBAL TACTICAL ASSET ALLOCATION FUND (SHARES/BBALX) | ||||||||
| Average Annual Return, Percent | 19.13% | 5.89% | 5.28% | ||||||
| SHORT BOND FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | SHORT BOND FUND (SHARES/BSBAX) | ||||||||
| Average Annual Return, Percent | 7.41% | 1.79% | 1.72% | ||||||
| CORE BOND FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | CORE BOND FUND (SHARES/NOCBX) | ||||||||
| Average Annual Return, Percent | 11.87% | 0.25% | 1.72% | ||||||
| HIGH YIELD FIXED INCOME FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | HIGH YIELD FIXED INCOME FUND (SHARES/NHFIX) | ||||||||
| Average Annual Return, Percent | 15.45% | 4.61% | 4.47% | ||||||
| SMALL CAP CORE FUND - CLASS K | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | SMALL CAP CORE FUND (CLASS K/NSCKX) | ||||||||
| Average Annual Return, Percent | 26.92% | 10.38% | 9.18% | ||||||
| SMALL CAP CORE FUND - CLASS I | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | SMALL CAP CORE FUND (CLASS I/NSGRX) | ||||||||
| Average Annual Return, Percent | 26.82% | 10.30% | 9.14% | ||||||
| U.S. TREASURY INDEX FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | U.S. TREASURY INDEX FUND (SHARES/BTIAX) | ||||||||
| Average Annual Return, Percent | 9.58% | (0.35%) | 1.18% | ||||||
| U.S. GOVERNMENT SELECT MONEY MARKET FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | U.S. GOVERNMENT SELECT MONEY MARKET FUND (SHARES/NOSXX) | ||||||||
| Average Annual Return, Percent | 5.18% | 2.16% | 1.45% | ||||||
| LARGE CAP VALUE FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | LARGE CAP VALUE FUND (SHARES/NOLVX) | ||||||||
| Average Annual Return, Percent | 25.17% | 10.82% | 8.84% | ||||||
| INTERNATIONAL EQUITY INDEX FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | INTERNATIONAL EQUITY INDEX FUND (SHARES/NOINX) | ||||||||
| Average Annual Return, Percent | 25.47% | 8.20% | 5.69% | ||||||
| GLOBAL REAL ESTATE INDEX FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | GLOBAL REAL ESTATE INDEX FUND (SHARES/NGREX) | ||||||||
| Average Annual Return, Percent | 29.73% | 1.80% | 4.33% | ||||||
| U.S. GOVERNMENT MONEY MARKET FUND | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | U.S. GOVERNMENT MONEY MARKET FUND (SHARES/NOGXX) | ||||||||
| Average Annual Return, Percent | 5.15% | 2.10% | 1.42% | ||||||
| BLOOMBERG U.S. MUNICIPAL BOND INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. MUNICIPAL BOND INDEX | ||||||||
| Average Annual Return, Percent | [1],[2],[3],[4],[5],[6],[7] | 10.37% | 1.39% | 2.52% | |||||
| BLOOMBERG U.S. MUNICIPAL INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. MUNICIPAL INDEX | ||||||||
| Average Annual Return, Percent | 10.37% | 1.39% | 2.52% | ||||||
| Standard & Poor's 500 Index [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | S&P 500® INDEX | ||||||||
| Average Annual Return, Percent | 36.35% | 15.98% | 13.38% | ||||||
| BLOOMBERG U.S. AGGREGATE BOND INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. AGGREGATE BOND INDEX | ||||||||
| Average Annual Return, Percent | [8],[9],[10],[11] | 11.57% | 0.33% | 1.84% | |||||
| MSCI WORLD EX USA INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MSCI WORLD EX USA INDEX | ||||||||
| Average Annual Return, Percent | 24.98% | 8.36% | 5.68% | ||||||
| MSCI ACWI INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MSCI ACWI INDEX | ||||||||
| Average Annual Return, Percent | [12],[13] | 31.76% | 12.19% | 9.39% | |||||
| RUSSELL 3000 INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | RUSSELL 3000® INDEX | ||||||||
| Average Annual Return, Percent | [14],[15] | 35.19% | 15.26% | 12.83% | |||||
| Russell Midcap Growth Index [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | RUSSELL 3000® INDEX | ||||||||
| Average Annual Return, Percent | [16] | 35.19% | 15.26% | 12.83% | |||||
| MSCI EM (EMERGING MARKETS) INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MSCI EM (EMERGING MARKETS) INDEX | ||||||||
| Average Annual Return, Percent | 26.05% | 5.75% | 4.02% | ||||||
| MSCI WORLD EX USA IMI INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MSCI WORLD EX USA IMI INDEX | ||||||||
| Average Annual Return, Percent | 24.77% | 8.14% | 5.71% | ||||||
| MSCI WORLD INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MSCI WORLD INDEX | ||||||||
| Average Annual Return, Percent | [17] | 32.43% | 13.04% | 10.07% | |||||
| BLOOMBERG GLOBAL AGGREGATE BOND INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG GLOBAL AGGREGATE BOND INDEX | ||||||||
| Average Annual Return, Percent | [18] | 11.98% | (0.83%) | 0.57% | |||||
| RUSSELL 1000 INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | RUSSELL 1000® INDEX | ||||||||
| Average Annual Return, Percent | 35.68% | [19] | 15.64% | [19] | 14.12% | 13.10% | [19] | ||
| BLOOMBERG UNIVERSAL INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG UNIVERSAL INDEX | ||||||||
| Average Annual Return, Percent | [20],[21] | 12.08% | 0.70% | 2.15% | |||||
| MSCI EAFE INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MSCI EAFE INDEX | ||||||||
| Average Annual Return, Percent | 24.77% | 8.20% | 5.71% | ||||||
| MSCI WORLD INDEX NET [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MSCI WORLD INDEX | ||||||||
| Average Annual Return, Percent | [22] | 29.30% | 1.39% | 4.23% | |||||
| BLOOMBERG CALIFORNIA MUNICIPAL BOND INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG CALIFORNIA MUNICIPAL BOND INDEX | ||||||||
| Average Annual Return, Percent | 9.87% | 1.32% | 2.48% | ||||||
| BLOOMBERG INTERMEDIATE U.S. GOVERNMENT BOND INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG INTERMEDIATE U.S. GOVERNMENT BOND INDEX | ||||||||
| Average Annual Return, Percent | 8.33% | 0.84% | 1.50% | ||||||
| S&P GLOBAL INFRASTRUCTURE INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | S&P GLOBAL INFRASTRUCTURE INDEX | ||||||||
| Average Annual Return, Percent | 29.68% | 5.97% | 5.38% | ||||||
| BLOOMBERG MUNICIPAL 1 To 15 YEAR INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG MUNICIPAL 1-15 YEAR INDEX | ||||||||
| Average Annual Return, Percent | 8.47% | 1.45% | 2.24% | ||||||
| RUSSELL 2000 VALUE INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | RUSSELL 2000® VALUE INDEX | ||||||||
| Average Annual Return, Percent | 25.88% | 9.29% | 8.22% | ||||||
| BLOOMBERG MUNICIPAL BOND 60% HIGH YIELD/40% INVESTMENT GRADE INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG MUNICIPAL BOND 60% HIGH YIELD/40% INVESTMENT GRADE INDEX | ||||||||
| Average Annual Return, Percent | 14.53% | 2.42% | 3.73% | ||||||
| S&P MIDCAP 400® INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | S&P MIDCAP 400® INDEX | ||||||||
| Average Annual Return, Percent | 26.79% | 11.78% | 10.32% | ||||||
| BLOOMBERG 1-5 YEAR U.S. GOVERNMENT INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG 1-5 YEAR U.S. GOVERNMENT INDEX | ||||||||
| Average Annual Return, Percent | 7.49% | 1.24% | 1.47% | ||||||
| BLOOMBERG 1-5 YEAR BLEND MUNICIPAL BOND INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG 1-5 YEAR BLEND MUNICIPAL BOND INDEX | ||||||||
| Average Annual Return, Percent | 6.41% | 1.36% | 1.50% | ||||||
| MSCI WORLD ESG LEADERS INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MSCI WORLD ESG LEADERS INDEX | ||||||||
| Average Annual Return, Percent | 32.89% | 13.29% | 10.19% | ||||||
| FTSE EPRA NAREIT DEVELOPED INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | FTSE EPRA NAREIT DEVELOPED INDEX | ||||||||
| Average Annual Return, Percent | 28.86% | 1.39% | 4.06% | ||||||
| ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX | ||||||||
| Average Annual Return, Percent | 4.07% | 1.57% | 1.24% | ||||||
| ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX | ||||||||
| Average Annual Return, Percent | 5.47% | 1.40% | 1.30% | ||||||
| Seventy Five% ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX AND 25% ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | 75% ICE BofA 6-12 MONTH MUNICIPAL SECURITIES INDEX AND 25% ICE BofA 1-3 YEAR US MUNICIPAL SECURITIES INDEX | ||||||||
| Average Annual Return, Percent | 4.42% | 1.53% | 1.26% | ||||||
| ICE BofA 1-YEAR U.S. TREASURY NOTE INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | ICE BofA 1-YEAR U.S. TREASURY NOTE INDEX | ||||||||
| Average Annual Return, Percent | 5.87% | 1.99% | 1.55% | ||||||
| BLOOMBERG CALIFORNIA INTERMEDIATE MUNICIPAL BOND INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG CALIFORNIA INTERMEDIATE MUNICIPAL BOND INDEX | ||||||||
| Average Annual Return, Percent | 8.14% | 1.20% | 2.07% | ||||||
| BLOOMBERG ARIZONA MUNICIPAL BOND INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG ARIZONA MUNICIPAL BOND INDEX | ||||||||
| Average Annual Return, Percent | 10.10% | 1.22% | 2.33% | ||||||
| RUSSELL 2000 INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | RUSSELL 2000® INDEX | ||||||||
| Average Annual Return, Percent | 26.76% | 9.39% | 8.78% | ||||||
| ICE BofA U.S. HIGH YIELD CONSTRAINED INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. HIGH YIELD CONSTRAINED INDEX | ||||||||
| Average Annual Return, Percent | 15.67% | 4.53% | 4.95% | ||||||
| BLENDED INDEX (60% MSCI ALL COUNTRY WORLD INDEX AND 40% BLOOMBERG U.S. AGGREGATE BOND INDEX) [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLENDED INDEX (60% MSCI ALL COUNTRY WORLD INDEX AND 40% BLOOMBERG U.S. AGGREGATE BOND INDEX) | ||||||||
| Average Annual Return, Percent | 23.38% | 7.58% | 6.54% | ||||||
| BLOOMBERG 1-3 YEAR U.S. GOVERNMENT/CREDIT INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG 1-3 YEAR U.S. GOVERNMENT/CREDIT INDEX | ||||||||
| Average Annual Return, Percent | 7.19% | 1.70% | 1.64% | ||||||
| BLOOMBERG U.S. CORPORATE HIGH YIELD 2% ISSUER CAPPED INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. CORPORATE HIGH YIELD 2% ISSUER CAPPED INDEX | ||||||||
| Average Annual Return, Percent | 15.73% | 4.70% | 5.04% | ||||||
| BLOOMBERG U.S. TREASURY INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | BLOOMBERG U.S. TREASURY INDEX | ||||||||
| Average Annual Return, Percent | 9.72% | (0.20%) | 1.34% | ||||||
| RUSSEL 1000 VALUE INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | RUSSELL 1000® VALUE INDEX | ||||||||
| Average Annual Return, Percent | 27.76% | 10.69% | 9.23% | ||||||
| MSCI ACWI IMI CORE REAL ESTATE INDEX [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | MSCI ACWI IMI CORE REAL ESTATE INDEX | ||||||||
| Average Annual Return, Percent | 32.43% | 13.04% | 10.07% | ||||||
| [1]Effective July 31, 2024, the Fund changed its broad-based securities market index from the 75% ICE BofA 6-12 Month Municipal Securities Index and 25% ICE BofA 1-3 Year US Municipal Securities Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements.[2]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg 1-5 Year Blend Municipal Bond Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements.[3]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg Arizona Municipal Bond Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements.[4]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg California Intermediate Municipal Bond Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements.[5]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg California Municipal Bond Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements.[6]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg Municipal 1-15 Year Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements.[7]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg Municipal Bond 60% High Yield/40% Investment Grade Index to the Bloomberg U.S. Municipal Bond Index in connection with new regulatory requirements.[8]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg 1-3 Year U.S. Government/Credit Index to the Bloomberg U.S. Aggregate Bond Index in connection with new regulatory requirements.[9]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg 1-5 Year U.S. Government Index to the Bloomberg U.S. Aggregate Bond Index in connection with new regulatory requirements.[10]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg Intermediate U.S. Government Bond Index to the Bloomberg U.S. Aggregate Bond Index in connection with new regulatory requirements.[11]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg U.S. Treasury Index to the Bloomberg U.S. Aggregate Bond Index in connection with new regulatory requirements.[12]Effective July 31, 2024, the Fund changed its broad-based securities market index from the FTSE EPRA Nareit Developed Index to the MSCI ACWI Index in connection with new regulatory requirements.[13]Effective July 31, 2024, the Fund changed its broad-based securities market index from the S&P Global Infrastructure Index to the MSCI ACWI Index in connection with new regulatory requirements.[14]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Russell 2000® Index to the Russell 3000® Index in connection with new regulatory requirements.[15]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Russell 2000® Value Index to the Russell 3000® Index in connection with new regulatory requirements.[16]Effective July 31, 2024, the Fund changed its broad-based securities market index from the S&P Midcap 400® Index to the Russell 3000® Index in connection with new regulatory requirements.[17]Effective July 31, 2024, the Fund changed its broad-based securities market index from the MSCI World ESG Leaders Index to the MSCI World Index in connection with new regulatory requirements.[18]Effective July 31, 2024, the Fund changed its broad-based securities market index from the ICE BofA 1-Year U.S. Treasury Note Index to the Bloomberg Global Aggregate Bond Index in connection with new regulatory requirements.[19]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Russell 1000® Value Index to the Russell 1000® Index in connection with new regulatory requirements.[20]Effective July 31, 2024, the Fund changed its broad-based securities market index from the Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index to the Bloomberg Universal Index in connection with new regulatory requirements.[21]Effective July 31, 2024, the Fund changed its broad-based securities market index from the ICE BofA U.S. High Yield Constrained Index to the Bloomberg Universal Index in connection with new regulatory requirements.[22]Effective July 31, 2024, the Fund changed its broad-based securities market index from the MSCI ACWI IMI Core Real Estate Index to the MSCI World Index in connection with new regulatory requirements. | |||||||||
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| U.S. GOVERNMENT MONEY MARKET FUND | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.20% |
| U.S. GOVERNMENT MONEY MARKET FUND | U.S. Government Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.20% |
| U.S. GOVERNMENT MONEY MARKET FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| GLOBAL REAL ESTATE INDEX FUND | United States Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 58% |
| GLOBAL REAL ESTATE INDEX FUND | Japanese Yen [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| GLOBAL REAL ESTATE INDEX FUND | Australian Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| GLOBAL REAL ESTATE INDEX FUND | Euro [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| GLOBAL REAL ESTATE INDEX FUND | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.20% |
| INTERNATIONAL EQUITY INDEX FUND | Japanese Yen [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| INTERNATIONAL EQUITY INDEX FUND | Australian Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| INTERNATIONAL EQUITY INDEX FUND | Euro [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.70% |
| INTERNATIONAL EQUITY INDEX FUND | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| INTERNATIONAL EQUITY INDEX FUND | British Pound [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| INTERNATIONAL EQUITY INDEX FUND | Swiss Franc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| LARGE CAP VALUE FUND | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22% |
| LARGE CAP VALUE FUND | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.60% |
| LARGE CAP VALUE FUND | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.80% |
| LARGE CAP VALUE FUND | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| LARGE CAP VALUE FUND | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| LARGE CAP VALUE FUND | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| LARGE CAP VALUE FUND | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| LARGE CAP VALUE FUND | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| LARGE CAP VALUE FUND | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| U.S. GOVERNMENT SELECT MONEY MARKET FUND | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.80% |
| U.S. GOVERNMENT SELECT MONEY MARKET FUND | U.S. Government Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.70% |
| U.S. GOVERNMENT SELECT MONEY MARKET FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.60% |
| U.S. TREASURY INDEX FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.20% |
| U.S. TREASURY INDEX FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| SMALL CAP CORE FUND - CLASS I | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| SMALL CAP CORE FUND - CLASS I | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.40% |
| SMALL CAP CORE FUND - CLASS I | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.40% |
| SMALL CAP CORE FUND - CLASS I | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| SMALL CAP CORE FUND - CLASS I | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| SMALL CAP CORE FUND - CLASS I | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| SMALL CAP CORE FUND - CLASS I | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.10% |
| SMALL CAP CORE FUND - CLASS I | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| SMALL CAP CORE FUND - CLASS K | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| SMALL CAP CORE FUND - CLASS K | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.40% |
| SMALL CAP CORE FUND - CLASS K | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.40% |
| SMALL CAP CORE FUND - CLASS K | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| SMALL CAP CORE FUND - CLASS K | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| SMALL CAP CORE FUND - CLASS K | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| SMALL CAP CORE FUND - CLASS K | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.10% |
| SMALL CAP CORE FUND - CLASS K | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| HIGH YIELD FIXED INCOME FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| HIGH YIELD FIXED INCOME FUND | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.80% |
| HIGH YIELD FIXED INCOME FUND | Foreign Issuer Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.50% |
| CORE BOND FUND | U.S. Government Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.40% |
| CORE BOND FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.90% |
| CORE BOND FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| CORE BOND FUND | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.90% |
| CORE BOND FUND | Foreign Issuer Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| CORE BOND FUND | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| SHORT BOND FUND | U.S. Government Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| SHORT BOND FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.40% |
| SHORT BOND FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| SHORT BOND FUND | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.40% |
| SHORT BOND FUND | Foreign Issuer Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| SHORT BOND FUND | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| GLOBAL TACTICAL ASSET ALLOCATION FUND | U.S. Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.70% |
| GLOBAL TACTICAL ASSET ALLOCATION FUND | U.S. Bond Investment Grade [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.80% |
| GLOBAL TACTICAL ASSET ALLOCATION FUND | Non U.S. Equity Developed [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.30% |
| GLOBAL TACTICAL ASSET ALLOCATION FUND | Non U.S. Equity Emerging Markets [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| GLOBAL TACTICAL ASSET ALLOCATION FUND | U.S. Bonds High Yield [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| GLOBAL TACTICAL ASSET ALLOCATION FUND | Global Infrastructure [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| GLOBAL TACTICAL ASSET ALLOCATION FUND | Global Real Estate [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| GLOBAL TACTICAL ASSET ALLOCATION FUND | Cash One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 79.60% |
| MULTI-MANAGER HIGH YIELD OPPORTUNITY FUND | Foreign Issuer Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| SMALL CAP INDEX FUND | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.30% |
| SMALL CAP INDEX FUND | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.30% |
| SMALL CAP INDEX FUND | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.60% |
| SMALL CAP INDEX FUND | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| SMALL CAP INDEX FUND | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| SMALL CAP INDEX FUND | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| SMALL CAP INDEX FUND | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15% |
| SMALL CAP INDEX FUND | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| U.S. QUALITY ESG FUND - CLASS I | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| U.S. QUALITY ESG FUND - CLASS I | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| U.S. QUALITY ESG FUND - CLASS I | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| U.S. QUALITY ESG FUND - CLASS I | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.20% |
| U.S. QUALITY ESG FUND - CLASS I | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| U.S. QUALITY ESG FUND - CLASS I | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| U.S. QUALITY ESG FUND - CLASS I | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| U.S. QUALITY ESG FUND - CLASS I | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| U.S. QUALITY ESG FUND - CLASS K | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| U.S. QUALITY ESG FUND - CLASS K | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| U.S. QUALITY ESG FUND - CLASS K | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| U.S. QUALITY ESG FUND - CLASS K | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.20% |
| U.S. QUALITY ESG FUND - CLASS K | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| U.S. QUALITY ESG FUND - CLASS K | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| U.S. QUALITY ESG FUND - CLASS K | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| U.S. QUALITY ESG FUND - CLASS K | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| ARIZONA TAX-EXEMPT FUND | Revenue Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 65.20% |
| ARIZONA TAX-EXEMPT FUND | General Obligation Unlimited Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.50% |
| ARIZONA TAX-EXEMPT FUND | Certificates of Participation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| ARIZONA TAX-EXEMPT FUND | Money Market Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| ARIZONA TAX-EXEMPT FUND | Special Assessment Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| ARIZONA TAX-EXEMPT FUND | General Obligation Limited Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND | Revenue Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 62% |
| CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND | General Obligation Unlimited Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.30% |
| CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND | Certificates of Participation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND | Money Market Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND | Special Tax Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND | Tax Allocation Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| ULTRA-SHORT FIXED INCOME FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| ULTRA-SHORT FIXED INCOME FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| ULTRA-SHORT FIXED INCOME FUND | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.10% |
| ULTRA-SHORT FIXED INCOME FUND | Foreign Issuer Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.70% |
| ULTRA-SHORT FIXED INCOME FUND | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| ULTRA-SHORT FIXED INCOME FUND - SIEBERT WILLIAMS SHANK SHARES | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| ULTRA-SHORT FIXED INCOME FUND - SIEBERT WILLIAMS SHANK SHARES | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| ULTRA-SHORT FIXED INCOME FUND - SIEBERT WILLIAMS SHANK SHARES | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.10% |
| ULTRA-SHORT FIXED INCOME FUND - SIEBERT WILLIAMS SHANK SHARES | Foreign Issuer Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.70% |
| ULTRA-SHORT FIXED INCOME FUND - SIEBERT WILLIAMS SHANK SHARES | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND | Foreign Issuer Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND | Municipal Bond [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 64.90% |
| TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND | Short Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.30% |
| Multi-Manager Global Real Estate Fund | United States Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 69% |
| Multi-Manager Global Real Estate Fund | Japanese Yen [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Multi-Manager Global Real Estate Fund | Australian Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Multi-Manager Global Real Estate Fund | Euro [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Multi-Manager Global Real Estate Fund | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Multi-Manager Global Real Estate Fund | British Pound [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Active M Emerging Markets Equity Fund | United States Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.20% |
| Active M Emerging Markets Equity Fund | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.70% |
| Active M Emerging Markets Equity Fund | Indian Rupee [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Active M Emerging Markets Equity Fund | Hong Kong Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.50% |
| Active M Emerging Markets Equity Fund | Taiwan Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.30% |
| Active M Emerging Markets Equity Fund | Korean Won [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Active M Emerging Markets Equity Fund | South African Rand [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS I | United States Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 72.20% |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS I | Japanese Yen [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS I | Euro [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS I | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.90% |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS K | United States Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 72.20% |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS K | Japanese Yen [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS K | Euro [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| GLOBAL SUSTAINABILITY INDEX FUND - CLASS K | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.90% |
| LIMITED TERM TAX-EXEMPT FUND | TEXAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| LIMITED TERM TAX-EXEMPT FUND | NEW YORK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| LIMITED TERM TAX-EXEMPT FUND | ALABAMA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| LIMITED TERM TAX-EXEMPT FUND | COLORADO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| LIMITED TERM TAX-EXEMPT FUND | All other states less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 64.70% |
| LIMITED TERM U.S. GOVERNMENT FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 96.60% |
| LIMITED TERM U.S. GOVERNMENT FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| BOND INDEX FUND | U.S. Government Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| BOND INDEX FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.80% |
| BOND INDEX FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| BOND INDEX FUND | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| BOND INDEX FUND | Foreign Issuer Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| ACTIVE M INTERNATIONAL EQUITY FUND | United States Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| ACTIVE M INTERNATIONAL EQUITY FUND | Japanese Yen [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| ACTIVE M INTERNATIONAL EQUITY FUND | Euro [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.10% |
| ACTIVE M INTERNATIONAL EQUITY FUND | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.40% |
| ACTIVE M INTERNATIONAL EQUITY FUND | British Pound [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.20% |
| EMERGING MARKETS EQUITY INDEX FUND | United States Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| EMERGING MARKETS EQUITY INDEX FUND | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.80% |
| EMERGING MARKETS EQUITY INDEX FUND | Indian Rupee [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19% |
| EMERGING MARKETS EQUITY INDEX FUND | Hong Kong Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.40% |
| EMERGING MARKETS EQUITY INDEX FUND | Taiwan Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.30% |
| EMERGING MARKETS EQUITY INDEX FUND | Korean Won [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| LARGE CAP CORE FUND | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| LARGE CAP CORE FUND | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.80% |
| LARGE CAP CORE FUND | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| LARGE CAP CORE FUND | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31% |
| LARGE CAP CORE FUND | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| LARGE CAP CORE FUND | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| LARGE CAP CORE FUND | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| LARGE CAP CORE FUND | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| MID CAP INDEX FUND | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| MID CAP INDEX FUND | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| MID CAP INDEX FUND | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.50% |
| MID CAP INDEX FUND | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| MID CAP INDEX FUND | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| MID CAP INDEX FUND | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.50% |
| MID CAP INDEX FUND | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| MID CAP INDEX FUND | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| HIGH YIELD MUNICIPAL FUND | TEXAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| HIGH YIELD MUNICIPAL FUND | All other states less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 65.90% |
| HIGH YIELD MUNICIPAL FUND | CALIFORNIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| HIGH YIELD MUNICIPAL FUND | FLORIDA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| HIGH YIELD MUNICIPAL FUND | INDIANA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| SMALL CAP VALUE FUND | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.70% |
| SMALL CAP VALUE FUND | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| SMALL CAP VALUE FUND | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| SMALL CAP VALUE FUND | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| SMALL CAP VALUE FUND | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| SMALL CAP VALUE FUND | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| SMALL CAP VALUE FUND | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| SMALL CAP VALUE FUND | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| SMALL CAP VALUE FUND | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| INTERMEDIATE TAX-EXEMPT FUND | TEXAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| INTERMEDIATE TAX-EXEMPT FUND | NEW YORK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.60% |
| INTERMEDIATE TAX-EXEMPT FUND | All other states less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.50% |
| INTERMEDIATE TAX-EXEMPT FUND | FLORIDA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| INTERMEDIATE TAX-EXEMPT FUND | ILLINOIS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| INTERMEDIATE TAX-EXEMPT FUND | WASHINGTON | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND | United States Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.10% |
| MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND | Euro [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.20% |
| MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.80% |
| MULTI-MANAGER GLOBAL LISTED INFRASTRUCTURE FUND | British Pound [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| INCOME EQUITY FUND | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| INCOME EQUITY FUND | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| INCOME EQUITY FUND | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| INCOME EQUITY FUND | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.40% |
| INCOME EQUITY FUND | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| INCOME EQUITY FUND | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| INCOME EQUITY FUND | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15% |
| INCOME EQUITY FUND | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| INTERNATIONAL EQUITY FUND | Japanese Yen [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.50% |
| INTERNATIONAL EQUITY FUND | Australian Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| INTERNATIONAL EQUITY FUND | Euro [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.10% |
| INTERNATIONAL EQUITY FUND | All other currencies less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.30% |
| INTERNATIONAL EQUITY FUND | British Pound [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| INTERNATIONAL EQUITY FUND | Swiss Franc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| INTERNATIONAL EQUITY FUND | Canadian Dollar [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| FIXED INCOME FUND | U.S. Government Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| FIXED INCOME FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| FIXED INCOME FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| FIXED INCOME FUND | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35% |
| FIXED INCOME FUND | Foreign Issuer Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| FIXED INCOME FUND | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| U.S. GOVERNMENT FUND | U.S. Government Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| U.S. GOVERNMENT FUND | U.S. Government Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.90% |
| U.S. GOVERNMENT FUND | Other less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| STOCK INDEX FUND | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| STOCK INDEX FUND | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| STOCK INDEX FUND | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| STOCK INDEX FUND | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| STOCK INDEX FUND | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| STOCK INDEX FUND | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| STOCK INDEX FUND | All other industries less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.50% |
| STOCK INDEX FUND | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| TAX-EXEMPT FUND | TEXAS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.60% |
| TAX-EXEMPT FUND | NEW YORK | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.10% |
| TAX-EXEMPT FUND | COLORADO | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| TAX-EXEMPT FUND | All other states less than 5% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.30% |
| TAX-EXEMPT FUND | FLORIDA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| TAX-EXEMPT FUND | ILLINOIS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| TAX-EXEMPT FUND | MASSACHUSETTS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| CALIFORNIA TAX-EXEMPT FUND | Revenue Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 59.30% |
| CALIFORNIA TAX-EXEMPT FUND | General Obligation Unlimited Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.20% |
| CALIFORNIA TAX-EXEMPT FUND | Certificates of Participation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| CALIFORNIA TAX-EXEMPT FUND | Money Market Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| CALIFORNIA TAX-EXEMPT FUND | Special Tax Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| CALIFORNIA TAX-EXEMPT FUND | Tax Allocation Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
