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Investor Class Shares Prospectus | MATTHEWS JAPAN FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading MATTHEWS JAPAN FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Long-term capital appreciation.

Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of this Fund.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
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 Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example of fund expenses, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 24% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 24.00%
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE OF FUND EXPENSES
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 and then redeem all of your shares at the end of those periods. 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, based on these assumptions your costs would be:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Matthews Japan Fund seeks to achieve its investment objective by investing at least 80% of its net assets, which include borrowings for investment purposes, in the common and preferred stocks of companies located in Japan. A company or other issuer is considered to be “located” in a country or a region, and a security or instrument will deemed to be an Asian (or specific country) security or instrument, if it has substantial ties to that country or region. Matthews currently makes that determination based primarily on one or more of the following criteria: (A) with respect to a company or issuer, whether (i) it is organized under the laws of that country or any country in that region; (ii) it derives at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed, or has at least 50% of its assets located, within that country or region; (iii) it has the primary trading markets for its securities in that country or region; (iv) it has its principal place of business in or is otherwise headquartered in that country or region; or (v) it is a governmental entity or an agency, instrumentality or a political subdivision of that country or any country in that region; and (B) with respect to an instrument or issue, whether (i) its issuer is headquartered or organized in that country or region; (ii) it is issued to finance a project with significant assets or operations in that country or region; (iii) it is secured or backed by assets located in that country or region; (iv) it is a component or its issuer is included in a recognized securities index for the country or region; or (v) it is denominated in the currency of an Asian country and addresses at least one of the other above criteria. The Fund may also invest in depositary receipts, including American, European and Global Depositary Receipts.


The Fund seeks to invest in companies capable of sustainable growth based on the fundamental characteristics of those companies, including balance sheet information; number of employees; size and stability of cash flow; management’s depth, adaptability and integrity; product lines; marketing strategies; corporate governance; and financial health. The Fund may invest in companies of any market capitalization. Matthews measures a company’s size with respect to fundamental criteria such as, but not limited to, market capitalization, book value, revenues, profits, cash flow, dividends paid and number of employees.

Risk [Heading] rr_RiskHeading Principal Risks of Investment
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

There is no guarantee that your investment in the Fund will increase in value. The value of your investment in the Fund could go down, meaning you could lose money. The principal risks of investing in the Fund are:


Political, Social and Economic Risks of Investing in Asia: The value of the Fund’s assets may be adversely affected by political, economic, social and religious instability; inadequate investor protection; changes in laws or regulations of countries within the Asian region (including countries in which the Fund invests, as well as the broader region); international relations with other nations; natural disasters; corruption and military activity. The Asian region, and particularly China, Japan and South Korea, may be adversely affected by political, military, economic and other factors related to North Korea. In addition, China’s long-running conflict over Taiwan, border disputes with many of its neighbors and historically strained relations with Japan could adversely impact economies in the region. The economies of many Asian countries differ from the economies of more developed countries in many respects, such as rate of growth, inflation, capital reinvestment, resource self-sufficiency, financial system stability, the national balance of payments position and sensitivity to changes in global trade. Certain Asian countries are highly dependent upon and may be affected by developments in the United States, Europe and other Asian economies.


Currency Risks: When the Fund conducts securities transactions in a foreign currency, there is the risk of the value of the foreign currency increasing or decreasing against the value of the U.S. dollar. The value of an investment denominated in a foreign currency will decline in dollar terms if that currency weakens against the dollar. While the Fund is permitted to hedge currency risks, Matthews does not anticipate doing so at this time.


Depositary Receipts: Although depositary receipts have risks similar to the securities that they represent, they may also involve higher expenses and may trade at a discount (or premium) to the underlying security. In addition, depositary receipts may not pass through voting and other shareholder rights, and may be less liquid than the underlying securities listed on an exchange.


Risks Associated with Japan: The Japanese economy has only recently emerged from a prolonged economic downturn. Since the year 2000, Japan’s economic growth rate has remained relatively low. The economy is characterized by an aging demographic, declining population, large government debt and highly regulated labor market. Economic growth is dependent on domestic consumption, deregulation and consistent government policy. International trade, particularly with the U.S., also impacts growth and adverse economic conditions in the U.S. or other such trade partners may affect Japan. Japan also has a growing economic relationship with China and other Southeast Asian countries, and thus Japan’s economy may also be affected by economic, political or social instability in those countries (whether resulting from local or global events).


Risks Associated with Smaller and Medium-Size Companies: Smaller and medium-size companies may be subject to a number of risks not associated with larger, more established companies, potentially making their stock prices more volatile and increasing the risk of loss.

Risk Lose Money [Text] rr_RiskLoseMoney The value of your investment in the Fund could go down, meaning you could lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Past Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart below shows the Fund’s performance for the past 10 years and how it has varied from year to year, reflective of the Fund’s volatility and some indication of risk. Also shown are the best and worst quarters for this time period. The table below shows the Fund’s performance over certain periods of time, along with performance of its benchmark index. The information presented below is past performance, before and after taxes, and is not a prediction of future results. Both the bar chart and performance table assume reinvestment of all dividends and distributions. For the Fund’s most recent month-end performance, please visit matthewsasia.com or call 800.789.ASIA (2742).

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart below shows the Fund’s performance for the past 10 years and how it has varied from year to year, reflective of the Fund’s volatility and some indication of risk.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.789.ASIA (2742)
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress matthewsasia.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The information presented below is past performance, before and after taxes, and is not a prediction of future results.
Bar Chart [Heading] rr_BarChartHeading ANNUAL RETURNS FOR YEARS ENDED 12/31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter


Q2 2009


23.45%


Worst Quarter


Q1 2009


-17.96%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.45%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.96%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS FOR PERIODS ENDED DECEMBER 31, 2015
Investor Class Shares Prospectus | MATTHEWS JAPAN FUND | MSCI Japan Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.90%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.61%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.08%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.93%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 1998
Investor Class Shares Prospectus | MATTHEWS JAPAN FUND | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Account Fee on Redemptions (for wire redemptions only) rr_MaximumAccountFee $ 9
Management Fees rr_ManagementFeesOverAssets 0.66%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets [1]
Administration and Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.14%
Other Expenses rr_OtherExpensesOverAssets 0.33%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.99%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 101
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 315
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 547
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,213
Annual Return 2006 rr_AnnualReturn2006 (6.44%)
Annual Return 2007 rr_AnnualReturn2007 (10.96%)
Annual Return 2008 rr_AnnualReturn2008 (28.38%)
Annual Return 2009 rr_AnnualReturn2009 10.06%
Annual Return 2010 rr_AnnualReturn2010 19.58%
Annual Return 2011 rr_AnnualReturn2011 (7.72%)
Annual Return 2012 rr_AnnualReturn2012 8.32%
Annual Return 2013 rr_AnnualReturn2013 34.03%
Annual Return 2014 rr_AnnualReturn2014 (2.60%)
Annual Return 2015 rr_AnnualReturn2015 20.83%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 20.83%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.53%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.16%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.88%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 1998
Investor Class Shares Prospectus | MATTHEWS JAPAN FUND | Investor Class Shares | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 20.83% [2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.35% [2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.82% [2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.33% [2]
Investor Class Shares Prospectus | MATTHEWS JAPAN FUND | Investor Class Shares | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 11.79% [2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.53% [2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.66% [2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.66% [2]
[1] The Trust's 12b-1 Plan (the "Plan") is inactive. Although the Plan currently is not active, it is reviewed by the Board annually in case the Board decides to re-activate the Plan. The Plan would not be re-activated without prior notice to shareholders. If the Plan were reactivated, the fee would be up to 0.25% for each of the Investor Class and Institutional Class, respectively.
[2] After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.