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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName AMANA MUTUAL FUNDS TRUST
Prospectus Date rr_ProspectusDate Sep. 25, 2020
AMANA INCOME FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Amana Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Current income and preservation of capital, consistent with Islamic principles. Current income is its primary objective.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This section describes the fees and expenses that you may pay if you buy and hold shares of the Income Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareowner Fees
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund 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 Income Fund may have transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in taxable distributions. Personal income taxes, which are not reflected in annual fund
operating expenses or in the example, affect your after-tax returns. During the most recent fiscal year, the Fund's portfolio turnover rate was 0.00% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate none
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help investors compare the cost of investing in shares of the Income Fund with the cost of investing in other mutual funds.
The example assumes an investor invests $10,000 in shares of the Income Fund for the time periods indicated and then redeems all shares at the end of those periods. The example also assumes that the investment has a 5% return each year and that the Fund's operating expenses remain the same. Although actual costs may be higher or lower, based on these assumptions an investor's expenses would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Income Fund invests primarily in dividend-paying common stocks, including foreign stocks. Investment decisions are made in accordance with Islamic principles. Generally, Islamic principles require that investors share in profit and loss, that they receive no usury or interest, and that they do not invest in a business that is prohibited by Islamic principles. Some of the businesses not permitted are alcohol, pornography, insurance, gambling, pork processing, and interest-based banks or finance associations.
The Income Fund does not make any investments that pay interest. Islamic principles discourage speculation, and the Fund tends to hold investments for several years.
The Income Fund diversifies its investments across industries and companies, and principally follows a large-cap value investment style. Common stock purchases are restricted to dividend-paying companies. The Fund seeks companies demonstrating both Islamic and sustainable characteristics. The Fund's adviser (Saturna Capital Corporation) considers issuers with sustainable characteristics to be those issuers that are more established, consistently profitable, and financially strong, and with robust policies in the areas of the environment, social responsibility, and corporate governance ("ESG"). The Fund's adviser employs a sustainable rating system based on its own, as well as third-party, data to identify issuers believed to present low risks in ESG. The Fund's adviser also uses negative screening to exclude security issuers primarily engaged in higher ESG risk businesses such as alcohol, tobacco, pornography, weapons, gambling, and fossil fuel extraction.
It is the policy of the Income Fund, under normal circumstances, to invest at least 80% of its total net assets in income-producing securities, primarily dividend-paying common stocks.
Risk [Heading] rr_RiskHeading Principal Risks of Investing
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Market risk:
The value of Income Fund shares rises and falls as the value of the securities in which the Fund invests goes up and down. Consider investing in the Fund only if you are willing to accept the risk that you may lose money. Fund share prices, yields, and total returns will change with the fluctuations in the securities markets as well as the fortunes of the industries and companies in which the Fund invests.
Investment strategy risk:
Islamic principles restrict the Income Fund's ability to invest in certain market sectors, such as financial companies and conventional fixed-income
securities. The adviser believes that Islamic and sustainable investing may mitigate security-specific risks, but the screens used in connection with these strategies reduce the investable universe, which may limit investment opportunities and adversely affect the Fund's performance. Because Islamic principles preclude the use of interest-paying instruments, cash reserves do not earn income.
Equity securities risk:
Equity securities may experience significant volatility in response to economic or market conditions or adverse events that affect a particular industry, sector, or company. Larger companies may have slower rates of growth as compared to smaller, faster-growing companies. Smaller companies may have more limited financial resources, products, or services, and tend to be more sensitive to changing economic or market conditions.
Foreign investing risk:
The Income Fund may invest in securities that are not traded in the United States when market conditions or investment opportunities arise that, in the judgment of the adviser (Saturna Capital Corporation), warrant such investment. Investments in the securities of foreign issuers may involve risks in addition to those normally associated with investments in the securities of US issuers. All foreign investments are subject to risks of: (1) foreign political and economic instability; (2) adverse movements in foreign exchange rates; (3) currency devaluation; (4) the imposition or tightening of exchange controls or other limitations on repatriation of foreign capital; (5) changes in foreign governmental attitudes towards private investment, including potential nationalization, increased taxation, or confiscation of assets; and (6) differing reporting, accounting, and auditing standards of foreign countries.
Risk Lose Money [Text] rr_RiskLoseMoney Consider investing in the Fund only if you are willing to accept the risk that you may lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart presents the calendar year total returns of the Income Fund Investor Shares before taxes. The bar chart provides an indication of the risks of investing in the Fund by showing changes in performance from year to year. A fund's past performance (before and after taxes) is not a guarantee of how a fund will perform in the future.
Performance data current to the most recent month-end and quarter-end are available on www.amanafunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The table below presents the average annual returns for the Income Fund and provides an indication of the risks of investing in the Fund by showing how the Fund's average annual returns for 1, 5, and 10 years and for the life of the Fund compare to those of a broad-based market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.amanafunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture A fund's past performance (before and after taxes) is not a guarantee of how a fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Return
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter
Q2 2019
11.67%
Worst Quarter
Q3 2011
-14.15%
The year-to-date return as of the most recent calendar quarter (which ended June 30, 2020) was
-2.86
%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state or local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor's tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns illustrated are only for the Investor Shares; after-tax returns for Institutional Shares will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
The table below presents the average annual returns for the Income Fund and provides an indication of the risks of investing in the Fund by showing how the Fund's average annual returns for 1, 5, and 10 years and for the life of the Fund compare to those of a broad-based market index.
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 any state or local taxes. After-tax returns illustrated are only for the Investor Shares; after-tax returns for Institutional Shares will vary. Actual after-tax returns depend on an investor's tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Periods ended December 31, 2019
AMANA INCOME FUND | Income Fund Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareowner Fees rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.78%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.03%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.06%
1 Year rr_ExpenseExampleYear01 $ 108
3 Years rr_ExpenseExampleYear03 337
5 Years rr_ExpenseExampleYear05 585
10 Years rr_ExpenseExampleYear10 $ 1,294
2010 rr_AnnualReturn2010 12.21%
2011 rr_AnnualReturn2011 1.94%
2012 rr_AnnualReturn2012 9.65%
2013 rr_AnnualReturn2013 29.72%
2014 rr_AnnualReturn2014 9.13%
2015 rr_AnnualReturn2015 (2.86%)
2016 rr_AnnualReturn2016 9.34%
2017 rr_AnnualReturn2017 21.69%
2018 rr_AnnualReturn2018 (5.22%)
2019 rr_AnnualReturn2019 25.28%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (2.86%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.67%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.15%)
Label rr_AverageAnnualReturnLabel AMANX
1 Year rr_AverageAnnualReturnYear01 25.28%
5 Years rr_AverageAnnualReturnYear05 8.94%
10 Years rr_AverageAnnualReturnYear10 10.54%
Life of Fund rr_AverageAnnualReturnSinceInception 8.89% [1]
AMANA INCOME FUND | Income Fund Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareowner Fees rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.78%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.83%
1 Year rr_ExpenseExampleYear01 $ 85
3 Years rr_ExpenseExampleYear03 265
5 Years rr_ExpenseExampleYear05 460
10 Years rr_ExpenseExampleYear10 $ 1,025
Label rr_AverageAnnualReturnLabel AMINX
1 Year rr_AverageAnnualReturnYear01 25.57%
5 Years rr_AverageAnnualReturnYear05 9.21%
Life of Fund rr_AverageAnnualReturnSinceInception 10.26% [2]
AMANA INCOME FUND | Return after taxes on distributions | Income Fund Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 23.21%
5 Years rr_AverageAnnualReturnYear05 7.53%
10 Years rr_AverageAnnualReturnYear10 9.67%
Life of Fund rr_AverageAnnualReturnSinceInception 8.01% [1]
AMANA INCOME FUND | Return after taxes on distributions and sale of Fund shares | Income Fund Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.18%
5 Years rr_AverageAnnualReturnYear05 6.87%
10 Years rr_AverageAnnualReturnYear10 9.16%
Life of Fund rr_AverageAnnualReturnSinceInception 6.86% [1]
AMANA INCOME FUND | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 31.49%
5 Years rr_AverageAnnualReturnYear05 11.69%
10 Years rr_AverageAnnualReturnYear10 13.55%
Life of Fund rr_AverageAnnualReturnSinceInception 13.16% [2]
[1] Amana Income Fund Investor Shares began operations June 23, 1986.
[2] Amana Income Fund Institutional Shares began operations September 25, 2013, and the Life of Fund return for the S&P 500 Index is shown since this date.