Amana Income Fund Amana Growth Fund Amana Developing World Fund Amana Participation Fund Investor Shares Institutional Shares Investor Shares Institutional Shares Investor Shares Institutional Shares Investor Shares Institutional Shares Growth investing risk [Member] Market risk [Member] Non-diversification and concentration risks [Member] Investment strategy risk [Member] Liquidity risk [Member] Equity securities risk [Member] Developing world and foreign investing risk [Member] Small-cap risk [Member] Foreign investing risk [Member] Sukuk risk [Member] Sector risk [Member] Technology sector risk [Member] Murabaha risk [Member] Wakala risk [Member] High-yield risk [Member] Interests rate risk [Member] Credits risk [Member] Subsidiary investment risk [Member] Tax risk [Member] Interest Rate Risk [Member] Credit Risk [Member] Bloomberg US Large Cap Index (reflects no deduction for fees, expenses, or taxes) Bloomberg 1000 Value Index (reflects no deduction for fees, expenses, or taxes) Bloomberg 1000 Growth Index (reflects no deduction for fees, expenses, or taxes) Bloomberg Emerging Markets Large, Mid & Small Index (reflects no deduction for fees, expenses, or taxes) Bloomberg Global Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) Bloomberg Custom Sukuk Index (reflects no deduction for fees, expenses, or taxes) S000050991 Member C000012979 Member C000131515 Member Smallcap Risk Member S000026568 Member C000065109 Member Sukuk Risk Member Murabaha Risk Member CreditRiskMember S000022508 Member C000131513 Member Investment Strategy Risk Member Highyield Risk Member Tax Risk Member Technology Sector Risk Member C000160666 Member Sector Risk Member Foreign Investing Risk Member Wakala Risk Member index_ Bloomberg_1000_ Value_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Credits Risk Member Liquidity Risk Member index_ Bloomberg_1000_ Growth_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member index_ Bloomberg_ Global_ Aggregate_ Bond_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Market Risk Member Developing World And Foreign Investing Risk Member Interests Rate Risk Member Subsidiary Investment Risk Member C000131514 Member index_ Bloomberg_ Emerging_ Markets_ Large_ Mid_ Small_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member index_ Bloomberg_ US_ Large_ Cap_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Nondiversification And Concentration Risks Member InterestRateRiskMember Equity Securities Risk Member S000004772 Member C000160667 Member index_ Bloomberg_ Custom_ Sukuk_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Growth Investing Risk Member C000079787 Member