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FRANKLIN GOLD & PRECIOUS METALS FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FRANKLIN GOLD AND PRECIOUS METALS FUND
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Capital appreciation. The Fund's secondary goal is to provide shareholders with current income through dividends or interest received from its investments.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at least $25,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under “Your Account” on page 34 in the Fund’s Prospectus and under “Buying and Selling Shares” on page 43 of the Fund’s Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases of shares through specific financial intermediaries is set forth in Appendix A – “Intermediary Sales Charge Discounts and Waivers” to the Fund’s prospectus.

Please note that the tables and examples below do not reflect any transaction fees that may be charged by financial intermediaries, or commissions that a shareholder may be required to pay directly to its financial intermediary when buying or selling Class R6 or Advisor Class shares.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder 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 Fund pays 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 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, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 17.60% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 17.60%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at least $25,000 in Franklin Templeton funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
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 the period. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If you do not sell your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund invests at least 80% of its net assets in securities of gold and precious metals operation companies. Gold and precious metals operation companies include companies that mine, process, or deal in gold or other precious metals, such as silver, platinum, and palladium, including mining finance and exploration companies as well as operating companies with long- or medium-life mines. Several metals, including non-precious metals such as copper, zinc or nickel, often can be found in the earth together and as a result, precious metals may not be the primary business of the company. For purposes of the Fund’s 80% policy, such companies may be considered to be gold and precious

metals operation companies as long as the investment manager determines, in its sole discretion, that the company provides attractive exposure to precious metals.

The Fund is a "non-diversified" fund, which means it generally invests a greater portion of its assets in the securities of one or more issuers and may invest overall in a smaller number of issuers than a diversified fund.

The Fund may buy securities of gold and precious metals operation companies located anywhere in the world and in general invests predominantly in non-U.S. companies. Currently a substantial portion of the companies in which the Fund invests are domiciled in Canada, although the mining operations of such companies often take place in other countries. The Fund may invest in companies without regard to market capitalization, and may heavily invest in small- and mid-capitalization companies. The Fund primarily invests in equity securities, primarily common stock. The Fund also invests in American, Global and European Depositary Receipts.

The Fund’s investment manager looks for companies with low cost reserves and experienced management teams with established track records, particularly focusing on companies with long life production profiles, expandable resource bases, and active exploration programs that can potentially drive future reserve and production growth.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal market conditions, the Fund invests at least 80% of its net assets in securities of gold and precious metals operation companies.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. government.

Gold and Precious Metals The prices of gold and precious metals operation companies are affected by the price of gold or other precious metals such as platinum, palladium and silver, as well as other prevailing market conditions. These prices may be volatile, fluctuating substantially over short periods of time. Depending on market conditions, gold and precious metals operation companies may dramatically outperform or underperform more traditional equity investments. In times of stable economic growth, traditional equity and debt investments could offer greater appreciation potential and the prices of gold and other precious metals may be adversely affected.

The prices of gold and other precious metals are affected by such factors as: (1) how much of the worldwide supply is held by large holders, such as governmental bodies and central banks; (2) unpredictable monetary policies and economic and political conditions in countries throughout the world; (3) supply and demand for gold bullion as an investment, including bars, coins or gold-backed financial

instruments such as exchange-traded funds; (4) demand for gold jewelry; and (5) government policies meant to influence demand for gold and other precious metals.

The prices of gold and precious metals operation companies are directly affected by: (1) declines in the prices of gold and precious metals; (2) rising capital costs as well as labor and other costs in mining and production; (3) adverse currency fluctuations, economic events or natural disasters or other events with a significant economic effect in the countries where these companies operate; (4) labor disruptions; (5) operational issues and failures; (6) access to reliable energy and equipment supplies; and (7) changes in laws relating to mining, production, or sales. These factors may result in deviations between the prices of the underlying metals and the securities of the operation companies in which the Fund invests. In addition, some gold and precious metals mining companies have hedged, to varying degrees, their exposure to falls in the prices of gold or precious metals by selling forward future production, which could limit the company’s benefit from future rises in the prices of gold or precious metals or increase the risk that the company could fail to meet its contractual obligations. With respect to mining companies, mining operations have varying expected life spans and companies that have mines with a short expected life span may experience more stock price volatility.

Changes in U.S. or foreign tax, currency or mining laws may make it more expensive and/or more difficult to pursue the Fund's investment strategies.

Market The market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. The market value of a security or other investment may be reduced by market activity or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more buyers than sellers, prices tend to rise.

The current global outbreak of the novel strain of coronavirus, COVID-19, has resulted in market closures and dislocations, extreme volatility, liquidity constraints and increased trading costs. Efforts to contain the spread of COVID-19 have resulted in global travel restrictions and disruptions of healthcare systems, business operations and supply chains, layoffs, volatility in consumer demand for certain products, defaults and credit ratings downgrades, and other significant economic impacts. The effects of COVID-19 have impacted global economic activity across many industries and may heighten other pre-existing political, social and economic risks, locally or globally. The full impact of the COVID-19 pandemic is unpredictable and may adversely affect the Fund’s performance.

Stock prices tend to go up and down more dramatically than those of debt securities. A slower-growth or recessionary economic environment could have an adverse effect on the prices of the various stocks held by the Fund.

Foreign Securities (non-U.S.) Investing in foreign securities typically involves more risks than investing in U.S. securities, and includes risks associated with: (i) internal and external political and economic developments – e.g., the political, economic and social policies and structures of some foreign countries may be less stable and more volatile than those in the U.S. or some foreign countries may be subject to trading restrictions or economic sanctions; (ii) trading practices – e.g., government supervision and regulation of foreign securities and currency markets, trading systems and brokers may be less than in the U.S.; (iii) availability of information – e.g., foreign issuers may not be subject to the same disclosure, accounting and financial reporting standards and practices as U.S. issuers; (iv) limited markets – e.g., the securities of certain foreign issuers may be less liquid (harder to sell) and more volatile; and (v) currency exchange rate fluctuations and policies – e.g., fluctuations may negatively affect investments denominated in foreign currencies and any income received or expenses paid by the Fund in that foreign currency. The risks of foreign investments may be greater in developing or emerging market countries.

Regional   Adverse conditions in a certain region or country can adversely affect securities of issuers in other countries whose economies appear to be unrelated. To the extent that the Fund invests a significant portion of its assets in a specific geographic region or a particular country, the Fund will generally have more exposure to the specific regional or country economic risks. In the event of economic or political turmoil or a deterioration of diplomatic relations in a region or country where a substantial portion of the Fund’s assets are invested, the Fund may experience substantial illiquidity or reduction in the value of the Fund’s investments.

Emerging Market Countries The Fund’s investments in emerging market countries are subject to all of the risks of foreign investing generally, and have additional heightened risks due to a lack of established legal, political, business and social frameworks to support securities markets, including: delays in settling portfolio securities transactions; currency and capital controls; greater sensitivity to interest rate changes; pervasiveness of corruption and crime; currency exchange rate volatility; and inflation, deflation or currency devaluation.

Frontier Market Countries Frontier market countries generally have smaller economies and even less developed capital markets than traditional developing markets, and, as a result, the risks of investing in developing market countries are magnified in frontier market countries. The magnification of risks are the result of: potential for extreme price volatility and illiquidity in frontier markets; government ownership or control of parts of private sector and of certain companies; trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by frontier market countries or

their trading partners; and the relatively new and unsettled securities laws in many frontier market countries.

Small and Mid Capitalization Companies Securities issued by small and mid capitalization companies may be more volatile in price than those of larger companies and may involve additional risks. Such risks may include greater sensitivity to economic conditions, less certain growth prospects, lack of depth of management and funds for growth and development, and limited or less developed product lines and markets. In addition, small and mid capitalization companies may be particularly affected by interest rate increases, as they may find it more difficult to borrow money to continue or expand operations, or may have difficulty in repaying any loans.

Income Because the Fund can only distribute what it earns, the Fund's distributions to shareholders may decline when dividend income from investments in stocks decline, or when the Fund does not have PFIC gains to be distributed. The Fund's income generally declines during periods of falling gold and precious metals prices.

Concentration To the extent the Fund concentrates in a specific industry, a group of industries, sector or type of investment, the Fund will carry much greater risks of adverse developments and price movements in such industries, sectors or investments than a fund that invests in a wider variety of industries, sectors or investments. There is also the risk that the Fund will perform poorly during a slump in demand for securities of companies in such industries or sectors.

Non-Diversification Because the Fund is non-diversified, it may be more sensitive to economic, business, political or other changes affecting individual issuers or investments than a diversified fund, which may negatively impact the Fund's performance and result in greater fluctuation in the value of the Fund’s shares.

Depositary Receipts Depositary receipts are subject to many of the risks of the underlying securities. For some depositary receipts, the custodian or similar financial institution that holds the issuer's shares in a trust account is located in the issuer's home country. In these cases if the issuer’s home country does not have developed financial markets, the Fund could be exposed to the credit risk of the custodian or financial institution and greater market risk. In addition, the depository institution may not have physical custody of the underlying securities at all times and may charge fees for various services. The Fund may experience delays in receiving its dividend and interest payments or exercising rights as a shareholder. There may be an increased possibility of untimely responses to certain corporate actions of the issuer in an unsponsored depositary receipt program. Accordingly, there may be less information available regarding issuers of securities underlying unsponsored programs and there may not be a correlation between this information and the market value of the depositary receipts.

Management The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's investment manager applies investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these decisions will produce the desired results.

Cybersecurity Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain access to Fund assets, Fund or customer data (including private shareholder information), or proprietary information, cause the Fund, the investment manager and/or their service providers (including, but not limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, and such third party service providers may have limited indemnification obligations to the Fund or investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value of these securities could decline if the issuers experience cybersecurity incidents.

Because technology is frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a chance that some risks have not been identified or prepared for, or that an attack may not be detected, which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other funds and business enterprises, the Fund, the investment manager and their service providers are subject to the risk of cyber incidents occurring from time to time.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the Fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Because the Fund is non-diversified, it may be more sensitive to economic, business, political or other changes affecting individual issuers or investments than a diversified fund, which may negatively impact the Fund's performance and result in greater fluctuation in the value of the Fund’s shares.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year for Class A shares. The table shows the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You can obtain updated performance information at franklintempleton.com or by calling (800) DIAL BEN/342-5236.

The secondary index in the table below shows how the Fund's performance compares to a group of securities that reflects the broader equity markets universe.

Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year for Class A shares. The table shows the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) DIAL BEN/342-5236
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress franklintempleton.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Class A Annual Total Returns
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
   

Best Quarter:

2020, Q2

69.49%

Worst Quarter:

2013, Q2

-38.15%

 
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (figures reflect sales charges) For periods ended December 31, 2021
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

No one index is representative of the Fund's portfolio.

The figures in the average annual total returns table above reflect the Class A shares maximum front-end sales charge of 5.50%. Prior to September 10, 2018, Class A shares were subject to a maximum front-end sales charge of 5.75%. If the prior maximum front-end sales charge of 5.75% was reflected, performance for Class A shares in the average annual total returns table would be lower.

The after-tax returns are calculated using the historical highest 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 are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns for other classes will vary.
FRANKLIN GOLD & PRECIOUS METALS FUND | FTSE Gold Mines Index  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (index reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel FTSE Gold Mines Index (index reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (10.38%)
5 Years rr_AverageAnnualReturnYear05 9.64%
10 Years rr_AverageAnnualReturnYear10 (3.32%)
FRANKLIN GOLD & PRECIOUS METALS FUND | S&P 500 Index  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (index reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel S&P 500 Index (index reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.48%
10 Years rr_AverageAnnualReturnYear10 16.55%
FRANKLIN GOLD & PRECIOUS METALS FUND | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.46%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.17%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.88%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.88% [2]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2023
1 Year rr_ExpenseExampleYear01 $ 635
3 Years rr_ExpenseExampleYear03 815
5 Years rr_ExpenseExampleYear05 1,011
10 Years rr_ExpenseExampleYear10 $ 1,575
Annual Return 2012 rr_AnnualReturn2012 (14.78%)
Annual Return 2013 rr_AnnualReturn2013 (48.03%)
Annual Return 2014 rr_AnnualReturn2014 (10.16%)
Annual Return 2015 rr_AnnualReturn2015 (22.41%)
Annual Return 2016 rr_AnnualReturn2016 55.61%
Annual Return 2017 rr_AnnualReturn2017 (0.12%)
Annual Return 2018 rr_AnnualReturn2018 (18.11%)
Annual Return 2019 rr_AnnualReturn2019 51.48%
Annual Return 2020 rr_AnnualReturn2020 43.67%
Annual Return 2021 rr_AnnualReturn2021 (3.77%)
Year to Date Return, Label rr_YearToDateReturnLabel As of September 30, 2022, the Fund’s year-to-date return was -35.88%.
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (35.88%)
Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 69.49%
Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (38.15%)
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 (9.06%)
5 Years rr_AverageAnnualReturnYear05 10.11%
10 Years rr_AverageAnnualReturnYear10 (2.48%)
FRANKLIN GOLD & PRECIOUS METALS FUND | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions
1 Year rr_AverageAnnualReturnYear01 (12.08%)
5 Years rr_AverageAnnualReturnYear05 8.46%
10 Years rr_AverageAnnualReturnYear10 (3.60%)
FRANKLIN GOLD & PRECIOUS METALS FUND | Class A | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions and sale of Fund shares
1 Year rr_AverageAnnualReturnYear01 (5.16%)
5 Years rr_AverageAnnualReturnYear05 7.33%
10 Years rr_AverageAnnualReturnYear10 (2.28%)
FRANKLIN GOLD & PRECIOUS METALS FUND | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management fees rr_ManagementFeesOverAssets 0.46%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.17%
Total annual Fund operating expenses rr_ExpensesOverAssets 1.63%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.63% [2]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2023
1 Year rr_ExpenseExampleYear01 $ 266
3 Years rr_ExpenseExampleYear03 514
5 Years rr_ExpenseExampleYear05 886
10 Years rr_ExpenseExampleYear10 1,732
1 Year rr_ExpenseExampleNoRedemptionYear01 166
3 Years rr_ExpenseExampleNoRedemptionYear03 514
5 Years rr_ExpenseExampleNoRedemptionYear05 886
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,732
1 Year rr_AverageAnnualReturnYear01 (5.31%)
5 Years rr_AverageAnnualReturnYear05 10.53%
10 Years rr_AverageAnnualReturnYear10 (2.66%)
FRANKLIN GOLD & PRECIOUS METALS FUND | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.46%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.18%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.64%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.52% [2]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2023
1 Year rr_ExpenseExampleYear01 $ 53
3 Years rr_ExpenseExampleYear03 192
5 Years rr_ExpenseExampleYear05 344
10 Years rr_ExpenseExampleYear10 $ 786
1 Year rr_AverageAnnualReturnYear01 (3.42%)
5 Years rr_AverageAnnualReturnYear05 11.80%
Since Inception rr_AverageAnnualReturnSinceInception 5.01% [3]
FRANKLIN GOLD & PRECIOUS METALS FUND | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.46%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.17%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.63%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.63% [2]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2023
1 Year rr_ExpenseExampleYear01 $ 64
3 Years rr_ExpenseExampleYear03 201
5 Years rr_ExpenseExampleYear05 350
10 Years rr_ExpenseExampleYear10 $ 786
1 Year rr_AverageAnnualReturnYear01 (3.52%)
5 Years rr_AverageAnnualReturnYear05 11.63%
10 Years rr_AverageAnnualReturnYear10 (1.69%)
[1]

There is a 1% contingent deferred sales charge that applies to investments of $1 Million or more (see "Investment of $1 Million or More" under "Choosing a Share Class") and purchases by certain retirement plans without an initial sales charge on shares sold within 18 months of purchase.
[2] The transfer agent has contractually agreed to cap transfer agency fees for Class R6 shares for the Fund so that transfer agency fees for that class do not exceed 0.03% until November 30, 2023. During this term, this fee waiver and expense reimbursement agreement may not be terminated or amended without approval of the board of trustees except to add series and classes, to reflect the extension of termination dates or to lower the waiver and expense limitation.
[3]

Since inception May 1, 2013.