Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	HARBOR FUNDS
Prospectus Date	rr_ProspectusDate	Mar. 01, 2023
Harbor Global Leaders Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="color:#FFFFFF;font-family:Times New Roman;font-size:18pt;">Harbor Global Leaders 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 29%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	29.00%
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 in the equity securities of companies located anywhere in the world, including in developed and emerging markets. Under normal market conditions, the Fund expects to invest in at least three countries, including the United States, and invest at least 40% of its assets in foreign companies.The Fund may invest in companies at any stage of their growth lifecycles but will focus on companies that the Subadvisor believes are capable of generating sustainable, above-average, and relatively stable rates of earnings per share growth and strong free cash flows. The Subadvisor seeks investment opportunities in companies that the Subadvisor believes are leaders in their country, industry, or globally in terms of products, services, or execution. While the Fund may invest in equity securities of companies of any size, the Fund will primarily invest in large and mid-capitalization companies. As such, the Fund will generally not invest in companies with a market capitalization of less than $2 billion at the time of acquisition, and its total median market capitalization will typically be significantly greater than that of the MSCI All Country World Index, the Fund’s benchmark.In selecting securities for the Fund, the Subadvisor utilizes a fundamental, bottom-up, business-focused research approach. The Subadvisor seeks to identify growing businesses that meet the following six investment criteria:◾Sustainable above-average earnings growth;◾Leadership position in a promising business space;◾Significant competitive advantages;◾Clear mission and value-added focus;◾Financial strength; and◾Rational valuation relative to the market and business prospects.Companies that the Subadvisor determines may meet all six investment criteria are then analyzed with in-depth qualitative and quantitative research, including competitive analysis and proprietary financial modeling. The Subadvisor integrates environmental, social, and governance factors into its investment process and as part of its overall portfolio decision making process.The investment process generally results in a portfolio of 30-50 companies and, from time to time, may result in more substantial investments in particular sectors. Sector allocations are the outcome of the Subadvisor’s bottom-up investment process. From time to time, the Fund may have significant investments in one or more countries. The Fund may invest up to the greater of 30% of its assets or three times the emerging markets component of the Index, in securities of companies located in emerging markets. As of December 31, 2022, the emerging markets component of the Index comprised 10.4% of the total index.The Subadvisor believes that environmental, social and governance (“ESG”) factors are implicit in the six investment criteria discussed above. The Subadvisor considers the context for each business when determining the ESG issues that matter to its investment case and their relative importance in expected business outcomes and long-term investment results. Accordingly, ESG factors may vary depending on region, country, industry and company. Analysis of ESG factors is integrated into the investment decision-making process to the extent the Subadvisor believes it may affect the sustainability of a company’s value-creating potential.The Fund intends to hold securities for the longer term, generally three to five years. The Subadvisor may sell or trim back a particular holding as a result of the Subadvisor’s identification of an issue that negatively impacts the Subadvisor’s assessment of one or more of the six investment criteria discussed above that the Subadvisorbelieves cannot be resolved within an acceptable time frame. The Subadvisor may also sell a holding if it believes the security has become materially overvalued relative to its underlying business, for risk management purposes, and/or if a more attractive investment opportunity is identified.The equity securities in which the Fund invests include common stocks as well as preferred securities. The Fund may also purchase American Depositary Receipts (ADRs), European Depositary Receipts (EDRs) and Global Depositary Receipts (GDRs and, together with ADRs and EDRs, “Depositary Receipts”), which are certificates typically issued by a bank or trust company that represent ownership interests in securities issued by a foreign or domestic company. The Fund may invest in securities denominated in, and/or receiving revenues in, foreign currencies.The Fund may use foreign exchange spot contracts and foreign exchange forwards to seek to hedge currency exposure. A foreign exchange spot contract is an agreement to buy or sell a specific currency for immediate delivery (i.e., “on the spot”) as opposed to a set date in the future. The Fund may also invest in market access products, such as low exercise price warrants (“LEPWs”) and participatory notes (“P-notes”), to seek to gain economic exposure to markets where holding an underlying local security is not feasible or economical. A “market access product” is a derivative security that provides market exposure to an underlying foreign issuer.
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 five risks) include: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.Limited Number of Holdings Risk: The Fund may invest in a limited number of companies. As a result, an adverse event affecting a particular company may hurt the Fund’s performance more than if it had invested in a larger number of companies. In addition, the Fund’s performance may be more volatile than a fund that invests in a larger number of companies.Growth Style Risk: Over time, a growth oriented investing style may go in and out of favor, which may cause the Fund to underperform other equity funds that use different investing styles.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.Depositary Receipts Risk: Depositary receipts are certificates evidencing ownership of shares of a foreign issuer. These certificates are issued by depository banks and generally trade on an established market in the U.S. or elsewhere. The underlying shares are held in trust by a custodian bank or similar financial institution. The depository bank may not have physical custody of the underlying securities at all times and may charge fees for various services, including forwarding dividends and interest and corporate actions. Depositary receipts are alternatives to directly purchasing the underlying foreign securities in their national markets and currencies. Depositary receipts are subject to the risks associated with investing directly in foreign securities.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.Large Cap Risk: Large cap stocks may fall out of favor relative to small or mid cap stocks, which may cause the Fund to underperform other equity funds that focus on small or mid cap stocks.Mid Cap Risk: The Fund’s performance may be more volatile because it invests primarily in mid cap stocks. Mid cap companies may have limited product lines, markets and financial resources. Securities of mid cap companies are usually less stable in price and less liquid than those of larger, more established companies. Additionally, mid cap stocks may fall out of favor relative to small or large cap stocks, which may cause the Fund to underperform other equity funds that focus on small or large cap stocks.Participatory Notes Risk: The return on a P-note is linked to the performance of the issuers of the underlying securities. The performance of P-notes will not replicate exactly the performance of the issuers that they seek to replicate due to transaction costs and other expenses.  P-notes are subject to counterparty risk since the notes constitute general unsecured contractual obligations of the financial institutions issuing the notes, and the Fund is relying on the creditworthiness of such institutions and has no rights under the notes against the issuers of the underlying securities.  P-notes may also be less liquid and more difficult to sell.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.Sector Risk: Because the Fund may, from time to time, be more heavily invested in particular sectors, the value of its shares may be especially sensitive to factors and economic risks that specifically affect those sectors. As a result, the Fund’s share price may fluctuate more widely than the value of shares of a mutual fund that invests in a broader range of sectors.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.Warrants Risk: Warrants are rights to purchase securities at specific prices valid for a specific period of time.  While LEPWs seek to track the value of the underlying security, their prices will not necessarily move in parallel to the prices of the underlying securities, and warrant holders receive no dividends and have no voting rights or rights to the assets of the issuer of the underlying security.  Warrants are also subject to counterparty risk since the Fund is relying on the creditworthiness of the financial institution issuing the warrant to meet its obligations under the terms of the warrant.
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	Effective March 1, 2017, Sands Capital Management, LLC became the Fund’s Subadvisor.  Performance prior to that date is not attributable to Sands Capital.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 Quarter23.30%Q2 2020Worst Quarter-21.50%Q2 2022
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 Global Leaders Fund | Retirement Class
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.75%	[1]
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.17%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.92%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement	rr_NetExpensesOverAssets	0.78%	[1]
One Year	rr_ExpenseExampleYear01	$ 80
Three Years	rr_ExpenseExampleYear03	279
Five Years	rr_ExpenseExampleYear05	496
Ten Years	rr_ExpenseExampleYear10	$ 1,118
One Year	rr_AverageAnnualReturnYear01	(29.63%)	[2]
Annualized Five Years	rr_AverageAnnualReturnYear05	5.95%	[2]
Annualized Ten Years	rr_AverageAnnualReturnYear10	9.66%	[2]
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	13.25%	[2]
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 03, 2016	[2]
Harbor Global Leaders Fund | Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.75%	[1]
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.25%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.00%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement	rr_NetExpensesOverAssets	0.86%	[1]
One Year	rr_ExpenseExampleYear01	$ 88
Three Years	rr_ExpenseExampleYear03	304
Five Years	rr_ExpenseExampleYear05	539
Ten Years	rr_ExpenseExampleYear10	$ 1,212
2013	rr_AnnualReturn2013	41.36%
2014	rr_AnnualReturn2014	3.57%
2015	rr_AnnualReturn2015	2.52%
2016	rr_AnnualReturn2016	(4.61%)
2017	rr_AnnualReturn2017	31.44%
2018	rr_AnnualReturn2018	2.18%
2019	rr_AnnualReturn2019	35.83%
2020	rr_AnnualReturn2020	26.70%
2021	rr_AnnualReturn2021	7.54%
2022	rr_AnnualReturn2022	(29.69%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="font-family:Arial Narrow;font-size:9pt;margin-left:0.0pt;">Best Quarter</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	23.30%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="font-family:Arial Narrow;font-size:9pt;margin-left:0.0pt;">Worst Quarter</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2022
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(21.50%)
One Year	rr_AverageAnnualReturnYear01	(29.69%)
Annualized Five Years	rr_AverageAnnualReturnYear05	5.86%
Annualized Ten Years	rr_AverageAnnualReturnYear10	9.61%
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	13.21%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 03, 2009
Harbor Global Leaders Fund | Administrative Class
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.75%	[1]
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.25%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.25%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement	rr_NetExpensesOverAssets	1.11%	[1]
One Year	rr_ExpenseExampleYear01	$ 113
Three Years	rr_ExpenseExampleYear03	383
Five Years	rr_ExpenseExampleYear05	673
Ten Years	rr_ExpenseExampleYear10	$ 1,499
One Year	rr_AverageAnnualReturnYear01	(29.84%)
Annualized Five Years	rr_AverageAnnualReturnYear05	5.61%
Annualized Ten Years	rr_AverageAnnualReturnYear10	9.34%
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	12.93%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 03, 2009
Harbor Global Leaders Fund | Investor Class
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.75%	[1]
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.36%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.36%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement	rr_NetExpensesOverAssets	1.22%	[1]
One Year	rr_ExpenseExampleYear01	$ 124
Three Years	rr_ExpenseExampleYear03	417
Five Years	rr_ExpenseExampleYear05	731
Ten Years	rr_ExpenseExampleYear10	$ 1,623
One Year	rr_AverageAnnualReturnYear01	(29.92%)
Annualized Five Years	rr_AverageAnnualReturnYear05	5.48%
Annualized Ten Years	rr_AverageAnnualReturnYear10	9.21%
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	12.79%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 03, 2009
Harbor Global Leaders Fund | After Taxes on Distributions | Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	(31.01%)
Annualized Five Years	rr_AverageAnnualReturnYear05	4.16%
Annualized Ten Years	rr_AverageAnnualReturnYear10	7.82%
Annualized Since Inception	rr_AverageAnnualReturnSinceInception
Harbor Global Leaders Fund | After Taxes on Distributions and Sale of Fund Shares | Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	(16.64%)
Annualized Five Years	rr_AverageAnnualReturnYear05	4.76%
Annualized Ten Years	rr_AverageAnnualReturnYear10	7.67%
Annualized Since Inception	rr_AverageAnnualReturnSinceInception
Harbor Global Leaders Fund | MSCI All Country World (ND) (reflects no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	(18.36%)	[3]
Annualized Five Years	rr_AverageAnnualReturnYear05	5.23%	[3]
Annualized Ten Years	rr_AverageAnnualReturnYear10	7.98%	[3]
Annualized Since Inception	rr_AverageAnnualReturnSinceInception	11.04%	[3]

[1] The Advisor has contractually agreed to waive 0.05% of its management fee and to limit the Total Annual Fund Operating Expenses, excluding interest expense (if any), to 0.78%, 0.86%, 1.11%, and 1.22% 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 these agreements.

[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.