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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName AMANA MUTUAL FUNDS TRUST
Prospectus Date rr_ProspectusDate Sep. 28, 2018
Amana Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <b>Amana Growth Fund</b>
Objective [Heading] rr_ObjectiveHeading <b>Investment Objective</b>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Long-term capital growth, consistent with Islamic principles.
Expense [Heading] rr_ExpenseHeading <b>Fees and Expenses</b>
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 Growth Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <b>Shareowner Fees</b>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <b>Annual Fund Operating Expenses</b> (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <b>Portfolio Turnover</b>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Growth 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 <b>Example</b>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help investors compare the cost of investing in shares of the Growth Fund with the cost of investing in other mutual funds.

The example assumes an investor invests $10,000 in shares of the Growth 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 <b>Principal Investment Strategies</b>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Growth Fund invests only in 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 Growth Fund does not make any investments that pay interest. Islamic principles discourage speculation, and the Fund tends to hold investments for several years.

The Growth Fund diversifies its investments across industries and companies, and principally follows a large-cap value investment style. The Fund favors companies expected to grow earnings and stock prices faster than the economy. The Fund may also invest in smaller and less seasoned 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 Growth Fund, under normal circumstances, to invest at least 80% of total net assets in common stocks. The Fund's adviser (Saturna Capital Corporation) selects investments primarily on past earnings and revenue growth rates, and the expectation of increases in earnings and share price.
Risk [Heading] rr_RiskHeading <b>Principal Risks of Investing</b>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Market risk: The value of Growth Fund shares rises and falls as the value of the stocks 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.

Small-cap risk: The smaller and less seasoned companies that may be in the Growth Fund have a greater risk of price volatility. Growth stocks, which can be priced on future expectations rather than current results, may decline substantially when expectations are not met or general market conditions weaken.

Investment strategy risk: Islamic principles restrict the Growth 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. The Fund also tends to favor growth stocks, which tend to trade based on future earnings expectations, and may be more volatile than slower-growing value stocks, especially when market expectations are not met.

Foreign investing risk: The Growth 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 <b>Performance</b>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart presents the calendar year total returns of the Growth 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 of the Growth 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 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 <b>Annual Total Return</b>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter Q3 2010 12.77%
Worst Quarter Q4 2008 -18.34%
The year-to-date return as of the most recent calendar quarter (which ended June 30, 2018) was 3.69%.
Performance Table Heading rr_PerformanceTableHeading <b>Average Annual Total Returns</b>
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 of the Growth 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 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.
Caption rr_AverageAnnualReturnCaption Periods ended December 31, 2017
Amana Growth Fund | Growth Fund Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareowner Fees rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.81%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.08%
1 year rr_ExpenseExampleYear01 $ 110
3 years rr_ExpenseExampleYear03 343
5 years rr_ExpenseExampleYear05 595
10 years rr_ExpenseExampleYear10 $ 1,317
2008 rr_AnnualReturn2008 (29.66%)
2009 rr_AnnualReturn2009 32.40%
2010 rr_AnnualReturn2010 15.92%
2011 rr_AnnualReturn2011 (1.86%)
2012 rr_AnnualReturn2012 11.21%
2013 rr_AnnualReturn2013 22.83%
2014 rr_AnnualReturn2014 14.03%
2015 rr_AnnualReturn2015 (0.42%)
2016 rr_AnnualReturn2016 7.62%
2017 rr_AnnualReturn2017 28.98%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.69%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.77%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.34%)
Label rr_AverageAnnualReturnLabel <b>AMAGX</b>
1 Year rr_AverageAnnualReturnYear01 28.98%
5 Years rr_AverageAnnualReturnYear05 14.12%
10 Years rr_AverageAnnualReturnYear10 8.59%
Amana Growth Fund | Growth Fund Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareowner Fees rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.81%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.85%
1 year rr_ExpenseExampleYear01 $ 87
3 years rr_ExpenseExampleYear03 271
5 years rr_ExpenseExampleYear05 471
10 years rr_ExpenseExampleYear10 $ 1,049
Label rr_AverageAnnualReturnLabel <b>AMIGX</b>
1 Year rr_AverageAnnualReturnYear01 29.29%
Since Inception rr_AverageAnnualReturnSinceInception 13.67%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 25, 2013
Amana Growth Fund | Return after taxes on distributions | Growth Fund Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.03%
5 Years rr_AverageAnnualReturnYear05 12.12%
10 Years rr_AverageAnnualReturnYear10 7.62%
Amana Growth Fund | Return after taxes on distributions and sale of Fund shares | Growth Fund Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.94%
5 Years rr_AverageAnnualReturnYear05 10.90%
10 Years rr_AverageAnnualReturnYear10 7.02%
Amana Growth Fund | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 15.80%
10 Years rr_AverageAnnualReturnYear10 8.49%