Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	HARBOR FUNDS
Prospectus Date	rr_ProspectusDate	Mar. 01, 2023
Harbor Diversified International All Cap Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="color:#FFFFFF;font-family:Times New Roman;font-size:13.5pt;">Harbor Diversified International All Cap Fund</span><span style="color:#FFFFFF;font-family:Arial;font-size:16pt;font-weight:bold;">Fund Summary</span>
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#004DD6;font-family:Arial Narrow;font-size:14pt;font-weight:bold;">Investment Objective</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks long-term growth of capital.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#004DD6;font-family:Arial Narrow;font-size:14pt;font-weight:bold;">Fees and Expenses of the Fund</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-weight:bold;">Annual Fund Operating Expenses</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> (expenses that you pay each year as a percentage of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	<span style="font-family:Times New Roman;font-size:8pt;font-style:italic;">February </span><span style="font-family:Times New Roman;font-size:8pt;font-style:italic;line-height:8.5pt;"> </span><span style="font-family:Times New Roman;font-size:8pt;font-style:italic;">29, 2024</span>
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:4pt;">Portfolio Turnover</span>
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 24%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	24.00%
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:4pt;">Expense Example</span>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, under these assumptions, your costs would be:
Strategy [Heading]	rr_StrategyHeading	<span style="color:#004DD6;font-family:Arial Narrow;font-size:14pt;font-weight:bold;">Principal Investment Strategy</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests primarily (no less than 65% of its total assets under normal market conditions) in common and preferred stocks of foreign companies, including those located in emerging market countries.The Subadvisor’s investment strategy focuses on identifying attractive long-term investment opportunities that can arise as a result of certain capital cycle, or supply-side, conditions. Capital cycle investing is based on the concept that the prospect of high returns will attract excessive capital and competition and the prospect of low returns will excessively depress new capital investments and discourage competition. The assessments of how management responds to the forces of the capital cycle through its capital allocation strategy and how it is incentivized are both critical to the investment outcome. While capital cycles are often observed at an industry level, particularly where the investment merits of an individual business are influenced by the rationality of actors within a given competitive ecosystem, they are first identified through bottom-up analysis at the company level. The Subadvisorbroadly characterizes investments within two opposite points of the capital cycle:◾High Return Phase: Investments in the top half of the capital cycle, where high rates of return within a business and/or industry are being attained, are often characterized as having intrinsic pricing power that allow them to fend off competition and excess capital that would otherwise be drawn to the prospects of high returns. These types of investments can also be characterized as having a consolidated industry market structure with high barriers to entry.◾Depressed Return Phase: Investments in the bottom half of the capital cycle, where rates of return have fallen to or below the cost of capital and where capital is being repelled as a result, are often characterized as contrarian, deep value investments where an improvement in the economic returns of a business are not accurately discounted by the broad market. A consolidating market structure, where supply and competition are removed, or a radical shift in management strategy, are often conditions leading to these types of investments.The Subadvisor uses fundamental, bottom-up qualitative analysis to evaluate businesses and the industry within which they operate. Research meetings with company management represent a significant aspect of the analysis conducted by the Subadvisor. Companies that the Subadvisor finds attractive include those that:◾Deploy capital effectively and efficiently◾Have high insider ownership and/or where company management are appropriately incentivized to focus on long-term results◾Operate in a monopolistic, oligopolistic or consolidating industry◾Show improving or high and sustainable returns on invested capital◾Generate attractive or improving free cash-flowGiven the contrarian and long-term nature of the capital cycle, the Subadvisor’s investment strategy tends to result in a portfolio of investments that can differ significantly from the Fund’s benchmark index, with average holding periods of seven years or more for individual company investments. As part of its investment process, the Subadvisor considers environmental, social and governance (“ESG”) factors that it believes may have a material impact on an issuer and the value of its securities. As a result, the key ESG considerations may vary depending on the industry, sector, geographic region or other factors and the core business of each issuer.The Subadvisor allocates responsibility for sourcing investment opportunities among its portfolio managers by regions of the world, with different portfolio managers responsible for each of Europe, Japan, the Pacific Basin, emerging markets, and North America. The Subadvisor maintains an aggregate portfolio that is broadly regionally neutral relative to the benchmark index. All of the portfolio managers employ the capital cycle approach to investing across their respective regions in order to identify individual companies for investment. The investment ideas generated across each of the four regions are then combined into the Fund’s overall portfolio. This results in a portfolio that generally maintains investments in between 450 and 550 companies. While inherently diversified, a bias towards smaller and mid cap businesses in niche industries, coupled with a particularly long holding period, result in a portfolio that is significantly differentiated from the Fund’s benchmark index. The Fund may invest in securities denominated in, and/or receiving revenues in, foreign currencies.
Risk [Heading]	rr_RiskHeading	<span style="color:#004DD6;font-family:Arial Narrow;font-size:14pt;font-weight:bold;">Principal Risks</span>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	There is no guarantee that the investment objective of the Fund will be achieved. Stocks fluctuate in price and the value of your investment in the Fund may go down. This means that you could lose money on your investment in the Fund or the Fund may not perform as well as other investment options. Principal risks impacting the Fund (in alphabetical order after the first four risks) include:Capital Cycle Risk: The Subadvisor’s assessment of the capital cycle for a particular industry or company may be incorrect. Investing in companies at inopportune phases of the capital cycle can result in the Fund purchasing company stock at pricing levels that are higher than the market dynamics would support and therefore subject the Fund to greater risk that the stock price would decline rather than increase over time.Foreign Securities Risk: An investment in the Fund is subject to special risks in addition to those of U.S. securities. These risks include heightened political and economic risks, greater volatility, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, possible sanctions by governmental bodies of other countries and less stringent investor protection and disclosure standards of foreign markets. Foreign securities are sometimes less liquid and harder to value than securities of U.S. issuers. The securities markets of many foreign countries are relatively small, with a limited number of companies representing a small number of industries. If foreign securities are denominated and traded in a foreign currency, the value of the Fund’s foreign holdings can be affected by currency exchange rates and exchange control regulations. The Fund’s investments in foreign securities may also be subject to foreign withholding taxes.Global economies and financial markets are becoming increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market.Equity Risk: The values of equity or equity-related securities may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. They may also decline due to factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry. Equity securities generally have greater price volatility than fixed income securities.Market Risk: Securities markets are volatile and can decline significantly in response to adverse market, economic, political, regulatory or other developments, which may lower the value of securities held by the Fund, sometimes rapidly or unpredictably. Events such as war, acts of terrorism, social unrest, natural disasters, recessions, inflation, rapid interest rate changes, supply chain disruptions, sanctions, the spread of infectious illness or other public health threats could also significantly impact the Fund and its investments.Emerging Market Risk: Foreign securities risks are more significant in emerging market countries. These countries may have relatively unstable governments and less-established market economies than developed countries. Emerging markets may face greater social, economic, regulatory and political uncertainties. These risks make emerging market securities more volatile and less liquid than securities issued in more developed countries. Securities exchanges in emerging markets may suspend listed securities from trading for substantially longer periods of time than exchanges in developed markets, including for periods of a year or longer. If the Fund is holding a suspended security, that security would become completely illiquid as the Fund would not be able to dispose of the security until the suspension is lifted. In such instances, it can also be difficult to determine an appropriate valuation for the security because of a lack of trading and uncertainty as to when trading may resume.ESG Factors Risk: The consideration of ESG factors by the Subadvisor and/or Advisor, as applicable, could cause the Fund to perform differently than other funds. ESG factors are not the only consideration used by the Subadvisor and/or Advisor, as applicable, in making investment decisions for the Fund and the Fund may invest in a company that scores poorly on ESG factors if it scores well on other criteria. ESG factors may not be considered for every investment decision.Foreign Currency Risk: As a result of the Fund’s investments in securities denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected.Geographic Focus Risk: The Fund may invest a substantial amount of its assets in securities of issuers located in a single country or geographic region. As a result, any changes to the regulatory, political, social or economic conditions in such country or geographic region will generally have greater impact on the Fund than such changes would have on a more geographically diversified fund and may result in increased volatility and greater losses.Issuer Risk: An adverse event affecting a particular issuer in which the Fund is invested, such as an unfavorable earnings report, may depress the value of that issuer’s stock, sometimes rapidly or unpredictably.Preferred Stock Risk: Preferred stocks in which the Fund may invest are sensitive to interest rate changes, and are also subject to equity risk, which is the risk that stock prices will fall over short or extended periods of time. The rights of preferred stocks on the distribution of a company’s assets in the event of a liquidation are generally subordinate to the rights associated with a company’s debt securities.Selection Risk: The Subadvisor’s judgment about the attractiveness, value and growth potential of a particular security may be incorrect.  The Subadvisor and/or Advisor, as applicable, potentially will be prevented from executing investment decisions at an advantageous time or price as a result of domestic or global market disruptions, particularly disruptions causing heightened market volatility and reduced market liquidity, as well as increased or changing regulations.  Thus, investments that the Subadvisor and/or Advisor, as applicable, believes represent an attractive opportunity or in which the Fund seeks to obtain exposure may be unavailable entirely or in the specific quantities or prices sought by the Subadvisor and/or Advisor, as applicable, and the Fund may need to obtain the exposure through less advantageous or indirect investments or forgo the investment at the time.Small and Mid Cap Risk: The Fund’s performance may be more volatile because it may invest in issuers that are smaller companies. Smaller companies may have limited product lines, markets and financial resources. Securities of smaller companies are usually less stable in price and less liquid than those of larger, more established companies. Additionally, small and mid cap stocks may fall out of favor relative to large cap stocks, which may cause the Fund to underperform other equity funds that focus on large cap stocks.
Risk Lose Money [Text]	rr_RiskLoseMoney	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;">This means that you could </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;">lose money on your investment in the Fund or the Fund may not perform as well as other investment options.</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="color:#004DD6;font-family:Arial Narrow;font-size:14pt;font-weight:bold;">Performance</span>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and tables are intended to help you understand the risks and potential rewards of investing in the Fund. The bar chart shows how the performance of the Fund’s Institutional Class has varied from one calendar year to another over the periods shown. The table shows how the Fund’s average annual total returns  of the share classes presented compared to the returns of the Fund’s benchmark index, which includes securities with investment characteristics similar to those held by the Fund.Please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. To obtain updated performance information please visit the Fund’s website at harborcapital.com or call 800-422-1050.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;">The bar chart shows how the performance of the Fund’s </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;">Institutional Class has varied from one calendar year to another over the periods shown. The table shows how the Fund’s average annual total returns  of the share classes presented compared to the returns of the Fund’s benchmark index, which includes securities with investment characteristics similar to those held by the Fund.</span>
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	<span style="color:#000000;font-family:Times New Roman;font-size:8pt;font-style:italic;">Retirement Class shares commenced operations on March 1, 2016.</span>
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;">800-422-1050</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;">harborcapital.com</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;">Please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</span>
Bar Chart [Heading]	rr_BarChartHeading	<span style="font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:4pt;">Calendar Year Total Returns for Institutional Class Shares</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the time periods shown in the bar chart, the Fund’s highest and lowest returns for a calendar quarter were:Total ReturnsQuarter/YearBest Quarter19.80%Q4 2020Worst Quarter-27.37%Q1 2020
Performance Table Heading	rr_PerformanceTableHeading	<span style="font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:3pt;">Average Annual Total Returns — As of December 31, </span><span style="font-family:Arial Narrow;font-size:9pt;font-weight:bold;">2022</span>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;margin-left:0%;">After-tax returns are calculated using the historical highest individual </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;">federal marginal income tax rates and do not reflect the impact of state and local taxes.</span>
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;"> Actual after-tax returns will depend on </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;">a shareholder’s individual tax situation and may differ from those shown. The after-tax returns shown are not relevant to tax-exempt shareholders or shareholders who hold their Fund shares through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account. </span>
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	<span style="color:#000000;font-family:Times New Roman;font-size:9pt;">After-tax returns are shown for Institutional </span><span style="color:#000000;font-family:Times New Roman;font-size:9pt;">Class shares only. After-tax returns for each of the Retirement, Administrative, and Investor Class of shares will vary.</span>
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns will depend on a shareholder’s individual tax situation and may differ from those shown. The after-tax returns shown are not relevant to tax-exempt shareholders or shareholders who hold their Fund shares through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account. After-tax returns are shown for Institutional Class shares only. After-tax returns for each of the Retirement, Administrative, and Investor Class of shares will vary.
Harbor Diversified International All Cap Fund | Retirement Class
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.09%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.84%
Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement	rr_NetExpensesOverAssets	0.72%	[1]
One Year	rr_ExpenseExampleYear01	$ 74
Three Years	rr_ExpenseExampleYear03	256
Five Years	rr_ExpenseExampleYear05	454
Ten Years	rr_ExpenseExampleYear10	$ 1,026
One Year	rr_AverageAnnualReturnYear01	(14.30%)	[2]
Annualized Five Years	rr_AverageAnnualReturnYear05	1.84%	[2]
Annualized Ten Years	rr_AverageAnnualReturnYear10		[2]
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	4.09%	[2]
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 03, 2016	[2]
Harbor Diversified International All Cap Fund | Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.17%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.92%
Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement	rr_NetExpensesOverAssets	0.80%	[1]
One Year	rr_ExpenseExampleYear01	$ 82
Three Years	rr_ExpenseExampleYear03	281
Five Years	rr_ExpenseExampleYear05	498
Ten Years	rr_ExpenseExampleYear10	$ 1,120
2016	rr_AnnualReturn2016	(0.01%)
2017	rr_AnnualReturn2017	24.56%
2018	rr_AnnualReturn2018	(13.80%)
2019	rr_AnnualReturn2019	23.82%
2020	rr_AnnualReturn2020	8.26%
2021	rr_AnnualReturn2021	10.18%
2022	rr_AnnualReturn2022	(14.30%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;margin-left:0.0pt;">Best Quarter</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	19.80%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;margin-left:0.0pt;">Worst Quarter</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2020
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(27.37%)
One Year	rr_AverageAnnualReturnYear01	(14.30%)
Annualized Five Years	rr_AverageAnnualReturnYear05	1.76%
Annualized Ten Years	rr_AverageAnnualReturnYear10
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	4.03%
Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 11, 2015
Harbor Diversified International All Cap Fund | Administrative Class
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.17%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.17%
Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement	rr_NetExpensesOverAssets	1.05%	[1]
One Year	rr_ExpenseExampleYear01	$ 107
Three Years	rr_ExpenseExampleYear03	360
Five Years	rr_ExpenseExampleYear05	632
Ten Years	rr_ExpenseExampleYear10	$ 1,410
One Year	rr_AverageAnnualReturnYear01	(14.53%)
Annualized Five Years	rr_AverageAnnualReturnYear05	1.50%
Annualized Ten Years	rr_AverageAnnualReturnYear10
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	3.77%
Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 11, 2015
Harbor Diversified International All Cap Fund | Investor Class
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.28%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.28%
Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement	rr_NetExpensesOverAssets	1.16%	[1]
One Year	rr_ExpenseExampleYear01	$ 118
Three Years	rr_ExpenseExampleYear03	394
Five Years	rr_ExpenseExampleYear05	691
Ten Years	rr_ExpenseExampleYear10	$ 1,535
One Year	rr_AverageAnnualReturnYear01	(14.63%)
Annualized Five Years	rr_AverageAnnualReturnYear05	1.39%
Annualized Ten Years	rr_AverageAnnualReturnYear10
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	3.64%
Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 11, 2015
Harbor Diversified International All Cap Fund | After Taxes on Distributions | Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	(14.38%)
Annualized Five Years	rr_AverageAnnualReturnYear05	1.14%
Annualized Ten Years	rr_AverageAnnualReturnYear10
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	3.45%
Harbor Diversified International All Cap Fund | After Taxes on Distributions and Sale of Fund Shares | Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	(8.05%)
Annualized Five Years	rr_AverageAnnualReturnYear05	1.49%
Annualized Ten Years	rr_AverageAnnualReturnYear10
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	3.26%
Harbor Diversified International All Cap Fund | MSCI All Country World Ex. U.S. (ND) (reflects no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	(16.00%)	[3]
Annualized Five Years	rr_AverageAnnualReturnYear05	0.88%	[3]
Annualized Ten Years	rr_AverageAnnualReturnYear10		[3]
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	4.11%	[3]

[1] The Advisor has contractually agreed to limit the Fund’s operating expenses, excluding interest expense (if any), to 0.72% 0.80%, 1.05%, and 1.16% for the Retirement Class, Institutional Class, Administrative Class, and Investor Class, respectively, through February 29, 2024. Only the Fund’s Board of Trustees may modify or terminate this agreement.

[2] Retirement Class shares commenced operations on March 1, 2016. The performance attributed to the Retirement Class shares prior to that date is that of the Institutional Class shares. Performance prior to March 1, 2016 has not been adjusted to reflect the lower expenses of Retirement Class shares. During this period, Retirement Class shares would have had returns similar to, but potentially higher than, Institutional Class shares due to the fact that Retirement Class shares represent interests in the same portfolio as Institutional Class shares but are subject to lower expenses.

[3] Since Inception return based on the inception date of the Institutional Class shares.