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Investor Class Prospectus | MATTHEWS ASIA GROWTH FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Matthews Asia Growth 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 43
% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 43.00%
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 circumstances, the Matthews Asia Growth 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 Asia. The Fund may also invest in convertible securities, of any duration or quality, including those that are unrated, or would be below investment grade (referred to as “junk bonds”) if rated, of Asian companies. Asia consists of all countries and markets in Asia, and includes developed, emerging, and frontier countries and markets in the Asian region. Certain emerging market countries may also be classified as “frontier” market countries, which are a subset of emerging market countries with newer or even less developed economies and markets, such as Sri Lanka and Vietnam. A company or other issuer is considered to be “located” in a country or a region, and a security or instrument is 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 principally secured or backed by assets located in that country or region; (iv) it is a component of 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 term “located” and the associated criteria listed above have been defined in such a way that Matthews has latitude in determining whether an issuer should be included within a region or country. 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. Matthews expects that the companies in which the Fund invests typically will be of medium or large size, but the Fund may invest in companies of any size. 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. The implementation of the principal investment strategies of the Fund may result in a significant portion of the Fund’s assets being invested from time to time in one or more sectors, but the Fund may invest in companies in any sector.
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 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.
Public Health Emergency Risks:
Pandemics and other public health emergencies, including outbreaks of infectious diseases such as the current outbreak of the novel coronavirus
(“COVID-19”),
can result, and in the case of
COVID-19
is resulting, in market volatility and disruption, and materially and adversely impact economic conditions in ways that cannot be predicted, all of which could result in substantial
investment losses. Containment efforts and related restrictive actions by governments and businesses have significantly diminished and disrupted global economic activity across many industries. Less developed countries and their health systems may be more vulnerable to these impacts. The ultimate impact of
COVID-19
or other health emergencies on global economic conditions and businesses is impossible to predict accurately. Ongoing and potential additional material adverse economic effects of indeterminate duration and severity are possible. The resulting adverse impact on the value of an investment in the Fund could be significant and prolonged.
 
Other public health emergencies that may arise in the future could have similar or other unforeseen effects.
Currency Risk:
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 U.S. dollar terms if that currency weakens against the U.S. dollar. While the Fund is permitted to hedge currency risks, Matthews does not anticipate doing so at this time. Additionally, Asian countries may utilize formal or informal currency-exchange controls or “capital controls.” Capital controls may impose restrictions on the Fund’s ability to repatriate investments or income. Such controls may also affect the value of the Fund’s holdings.
Risks Associated with Emerging and Frontier Markets:
Many Asian countries are considered emerging or frontier markets. Such markets are often less stable politically and economically than developed markets such as the United States, and investing in these markets involves different and greater risks. There may be less publicly available information about companies in many Asian countries, and the stock exchanges and brokerage industries in many Asian countries typically do not have the level of government oversight as do those in the United States. Securities markets of many Asian countries are also substantially smaller, less liquid and more volatile than securities markets in the United States.
Growth Stock Risk:
Growth stocks may be more volatile than other stocks because they are more sensitive to investor perceptions of the issuing company’s growth potential. Growth stocks may go in and out of favor over time and may perform differently than the market as a whole.
Depositary Receipts Risk:
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.
Volatility Risk:
The smaller size and lower levels of liquidity in emerging markets, as well as other factors, may result in changes in the prices of Asian securities that are more volatile than those of companies in more developed regions. This volatility can cause the price of the Fund’s shares to go up or down dramatically. Because of this volatility, this Fund is better suited for long-term investors (typically five years or longer).
Convertible Securities Risk:
The Fund may invest in convertible preferred stocks, and convertible bonds and debentures. The risks of convertible bonds and debentures include repayment risk and interest rate risk. Many Asian
convertible securities are not rated by rating agencies. The Fund may invest in convertible debt securities of any maturity and in those that are unrated, or would be below investment grade (referred to as “junk bonds”) if rated. Therefore, credit risk may be greater for the Fund than for other funds in higher-grade securities. These securities are also subject to greater liquidity risk than many other securities.
Health Care Sector Risk:
Companies in the health care sector may be affected by various factors, including extensive government regulations, heavy dependence on patent protection, pricing pressure, increased cost of medical products and services, and product liability claims. Health care companies may be thinly capitalized and may be susceptible to product obsolescence.
Risks Associated with Smaller Companies:
Smaller companies may offer substantial opportunities for capital growth; they also involve substantial risks, and investments in smaller companies may be considered speculative. Such companies often have limited product lines, markets or financial resources. Securities of smaller companies may trade less frequently and in lesser volume than more widely held securities and the securities of smaller companies generally are subject to more abrupt or erratic price movements than more widely held or larger, more established companies or the market indices in general.
Risks Associated with Medium-Size Companies:
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.
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 Japanese economy is characterized by an aging demographic, declining population, large government debt and highly regulated labor market. Economic growth in Japan is dependent on domestic consumption, deregulation and consistent government policy. International trade, particularly with the U.S., also impacts growth of the Japanese economy, and adverse economic conditions in the U.S. or other trade partners may affect Japan.
Risks Associated with China and Hong Kong:
The Chinese government exercises significant control over China’s economy through its industrial policies, monetary policy, management of currency exchange rates, and management of the payment of foreign currency-denominated obligations. Changes in these policies could adversely impact affected industries or companies in China. China’s economy, particularly its export-oriented industries, may be adversely impacted by trade or political disputes with China’s major trading partners, including the U.S. In addition, as its consumer class continues to grow, China’s domestically oriented industries may be especially sensitive to changes in government policy and investment cycles. As demonstrated by Hong Kong protests in recent years over political, economic, and legal freedoms, and the Chinese government’s response to them, considerable political uncertainty continues to exist within Hong Kong. Due to the interconnected nature of the Hong Kong and Chinese economies, this instability in Hong Kong may cause uncertainty in the Hong Kong and Chinese markets. If China were to exert its authority so as to alter the economic, political or legal structures or the existing social policy of Hong Kong, investor and business confidence in Hong Kong could be negatively affected and have an adverse effect on the Fund’s investments.
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 2020 30.94% Worst Quarter Q1 2020 -17.19
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.
Average Annual Return, Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS FOR PERIODS ENDED DECEMBER 31, 2020
Investor Class Prospectus | MATTHEWS ASIA GROWTH FUND | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Account Fee on Redemptions (for wire redemptions only) rr_MaximumAccountFee $ 9
Management Fees rr_ManagementFeesOverAssets 0.67%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.41%
Administration and Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.08%
One year: rr_ExpenseExampleYear01 $ 110
Three years: rr_ExpenseExampleYear03 343
Five years: rr_ExpenseExampleYear05 595
Ten years: rr_ExpenseExampleYear10 $ 1,317
2011 rr_AnnualReturn2011 (12.70%)
2012 rr_AnnualReturn2012 17.47%
2013 rr_AnnualReturn2013 19.35%
2014 rr_AnnualReturn2014 1.49%
2015 rr_AnnualReturn2015 (0.05%)
2016 rr_AnnualReturn2016 0.92%
2017 rr_AnnualReturn2017 39.39%
2018 rr_AnnualReturn2018 (16.25%)
2019 rr_AnnualReturn2019 26.18%
2020 rr_AnnualReturn2020 46.76%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 30.94%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.19%)
1 year rr_AverageAnnualReturnYear01 46.76%
5 years rr_AverageAnnualReturnYear05 16.88%
10 years rr_AverageAnnualReturnYear10 10.48%
Since Inception rr_AverageAnnualReturnSinceInception 11.15%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2003
Investor Class Prospectus | MATTHEWS ASIA GROWTH FUND | Return after taxes on distributions | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 45.20% [1]
5 years rr_AverageAnnualReturnYear05 16.00% [1]
10 years rr_AverageAnnualReturnYear10 9.89% [1]
Since Inception rr_AverageAnnualReturnSinceInception 10.61% [1]
Investor Class Prospectus | MATTHEWS ASIA GROWTH FUND | Return after taxes on distributions and sale of Fund shares | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 28.64% [1]
5 years rr_AverageAnnualReturnYear05 13.44% [1]
10 years rr_AverageAnnualReturnYear10 8.47% [1]
Since Inception rr_AverageAnnualReturnSinceInception 9.50% [1]
Investor Class Prospectus | MATTHEWS ASIA GROWTH FUND | MSCI All Country Asia Pacific Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 20.07%
5 years rr_AverageAnnualReturnYear05 11.62%
10 years rr_AverageAnnualReturnYear10 6.68%
Since Inception rr_AverageAnnualReturnSinceInception 7.93%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2003
[1] 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.