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BrandywineGLOBAL - HIGH YIELD FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading BRANDYWINEGLOBAL — HIGH YIELD FUND
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The fund’s objective is high current income with the opportunity for capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and expenses of the fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The accompanying table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds distributed through Franklin Distributors, LLC (“Franklin Distributors” or the “Distributor”), the fund’s distributor. More information about these and other discounts is available from your Service Agent, in the fund’s Prospectus on page 28 under the heading “Additional information about each share class,” in the appendix titled “Appendix: Waivers and Discounts Available from Certain Service Agents” on page A‑1 of the fund’s Prospectus and in the fund’s Statement of Additional Information (“SAI”) on page 78 under the heading “Sales Charge Waivers and Reductions for Class A Shares.” “Service Agents” include banks, brokers, dealers, insurance companies, investment advisers, financial consultants or advisers, mutual fund supermarkets and other financial intermediaries that have entered into an agreement with the Distributor to sell shares of the fund. 
If you purchase Class I shares or Class IS shares through a Service Agent acting solely as an agent on behalf of its customers, that Service Agent may charge you a commission. Such commissions, if any, are not charged by the fund and are not reflected in the fee table or expense example below. 
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 31, 2023
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 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 period August 2, 2021 (reorganization date) to December 31, 2021, the fund’s portfolio turnover rate was 151% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 151.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock You may buy Class A shares in amounts of $1,000,000 or more at net asset value (without an initial sales charge), but if you redeem those shares within 18 months of their purchase, you will pay a contingent deferred sales charge of 1.00%.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds distributed through Franklin Distributors, LLC (“Franklin Distributors” or the “Distributor”), the fund’s distributor.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses for Class R shares are estimated for the current fiscal year. Actual expenses may differ from estimates.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total annual fund operating expenses do not correlate with the ratios of total net expenses to average net assets reported in the financial highlights tables in the fund’s Prospectus, as certain expenses are estimated for the fiscal year and as the ratios of total net expenses to average net assets reported in the financial highlights do not include acquired fund fees and expenses.
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:
 
•  
You invest $10,000 in the fund for the time periods indicated
•  
Your investment has a 5% return each year and the fund’s operating expenses remain the same (except that any applicable fee waiver or expense reimbursement is reflected only through its expiration date)
•  
You reinvest all distributions and dividends without a sales charge
Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Number of years you own your shares ($)
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Number of years you own your shares ($)
Strategy [Heading] rr_StrategyHeading Principal investment strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the fund intends to provide exposure to high yield securities by investing at least 80% of its net assets in a diversified portfolio of corporate debt securities that are rated at the time of purchase below investment grade (that is, securities rated below Baa/BBB assigned by at least one Nationally Recognized Statistical Rating Organization (“NRSRO”)) or unrated securities determined by the subadviser to be of comparable credit quality. These investments are also known as “junk bonds,” “high yield bonds,” and “non‑investment grade bonds,” and may include so called “distressed debt.” Such securities may be public or privately placed U.S. dollar denominated debt securities issued by U.S. and non‑U.S. companies (which may include companies in emerging markets) of any size, which the subadviser believes represent an attractive investment opportunity. However, investments in non‑U.S. obligations or securities will not exceed 25% of the net assets of the fund. The fund also may invest in other securities including investment grade securities. The fund may invest in securities of any maturity and does not maintain a dollar-weighted effective duration target for the securities in which it invests. 
While not a part of the fund’s principal investment strategy of investing in corporate bonds, the fund may invest in other securities such as trust preferred securities, convertible securities, preferred stock, equity securities, U.S. Government and Agency securities, and mortgage or asset-backed securities. In selecting securities for the fund, the subadviser performs a risk/reward analysis that includes an evaluation of credit risk, interest rate 
risk, yield and the legal and technical structure of the security. The subadviser will attempt to take advantage of inefficiencies that it believes exist in the fixed-income markets by purchasing securities at prices below the subadviser’s estimate of their fair value with the goal of selling securities as they approach or exceed the subadviser’s estimate of their fair value. The subadviser seeks to invest in securities that the subadviser expects to offer attractive prospects for current income and/or capital appreciation in relation to the risk borne. 
Risk [Heading] rr_RiskHeading Principal risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Risk is inherent in all investing. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or by any bank or government agency. The following is a summary description of certain risks of investing in the fund. 
Market and interest rate risk. The market prices of the fund’s securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, tariffs and trade disruptions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. If the market prices of the fund’s securities fall, the value of your investment will decline. The value of your investment will generally go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. A general rise in interest rates may cause investors to move out of fixed income securities on a large scale, which could adversely affect the price and liquidity of fixed income securities and could also result in increased redemptions from the fund. Recently, there have been signs of inflationary price movements. As such, fixed income securities markets may experience heightened levels of interest rate volatility and liquidity risk.  
The maturity of a security may be significantly longer than its duration. A security’s maturity and other features may be more relevant than its duration in determining the security’s sensitivity to other factors affecting the issuer or markets generally such as changes in credit quality or in the yield premium that the market may establish for certain types of securities. 
Credit risk. If an issuer or guarantor of a security held by the fund or a counterparty to a financial contract with the fund defaults or its credit is downgraded, or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of your investment will typically decline. Changes in actual or perceived creditworthiness may occur quickly. The fund could be delayed or hindered in its enforcement of rights against an issuer, guarantor or counterparty. Subordinated securities (meaning securities that rank below other securities with respect to claims on the issuer’s assets) are more likely to suffer a credit loss than non‑subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness.  
High yield (“junk”) bonds risk. High yield bonds are generally subject to greater credit risks than higher-grade bonds, including the risk of default on the payment of interest or principal. High yield bonds are considered speculative, typically have lower liquidity and are more difficult to value than higher grade bonds. High yield bonds tend to be volatile and more susceptible to adverse events, credit downgrades and negative sentiments and may be difficult to sell at a desired price, or at all, during periods of uncertainty or market turmoil.  
Issuer risk. The market price of a security can go up or down more than the market as a whole and can perform differently from the value of the market as a whole, due to factors specifically relating to the security’s issuer, such as disappointing earnings reports by the issuer, unsuccessful products or services, loss of major customers, changes in management, corporate actions, negative perception in the marketplace, or major litigation or changes in government regulations affecting the issuer or the competitive environment. An individual security may also be affected by factors relating to the industry or sector of the issuer. The fund may experience a substantial or complete loss on an individual security. Historically, the prices of securities of small and medium capitalization companies have generally been more volatile than those of large capitalization companies. A change in financial condition or other event affecting a single issuer may adversely impact the industry or sector of the issuer or securities markets as a whole.  
Portfolio management risk. The value of your investment may decrease if the subadviser’s judgment about the attractiveness or value of, or market trends affecting, a particular security, industry, sector or region, or about market movements, is incorrect or does not produce the desired results, or if there are imperfections, errors or limitations in the models, tools and data used by the subadviser. In addition, the fund’s investment strategies or policies may change from time to time. Those changes may not lead to the results intended by the subadviser and could have an adverse effect on the value or performance of the fund.  
Illiquidity risk. Some assets held by the fund may be or become impossible or difficult to sell, particularly during times of market turmoil. These illiquid assets may also be difficult to value. Markets may become illiquid when, for instance, there are few, if any, interested buyers or sellers or when dealers are unwilling or unable to make a market for certain securities. As a general matter, dealers have been less willing to make markets for fixed income securities. If the fund is forced to sell an illiquid asset to meet redemption requests or other cash needs, or to try to limit losses, the fund may be forced to sell at a substantial loss or may not be able to sell at all.  
Foreign investments and emerging markets risk. The fund’s investments in securities of foreign issuers or issuers with significant exposure to foreign markets involve additional risk as compared to investments in U.S. securities or issuers with predominantly domestic exposure, such as less liquid, less transparent, less regulated and more volatile markets. The value of the fund’s investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable or unsuccessful government actions, reduction of government or central bank support, inadequate accounting standards and auditing and financial recordkeeping requirements, lack of information and political,  
economic, financial or social instability. In addition, there may be significant obstacles to obtaining information necessary for investigations into or litigation against issuers located in or operating in certain foreign markets, particularly emerging market countries, and shareholders may have limited legal remedies. To the extent the fund focuses its investments in a single country or only a few countries in a particular geographic region, economic, political, regulatory or other conditions affecting such country or region may have a greater impact on fund performance relative to a more geographically diversified fund. 
The value of investments in securities denominated in foreign currencies increases or decreases as the rates of exchange between those currencies and the U.S. dollar change. Currency conversion costs and currency fluctuations could erase investment gains or add to investment losses. Currency exchange rates can be volatile, and are affected by factors such as general economic and political conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls and speculation. The fund may be unable or may choose not to hedge its foreign currency exposure. 
Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by local banks, agents and depositories. Settlement of trades in these markets can take longer than in other markets and the fund may not receive its proceeds from the sale of certain securities for an extended period (possibly several weeks or even longer). 
The risks of foreign investments are heightened when investing in issuers in emerging market countries. Emerging market countries tend to have economic, political and legal systems that are less developed and are less stable than those of more developed countries. Their economies tend to be less diversified than those of more developed countries. They typically have fewer medical and economic resources than more developed countries, and thus they may be less able to control or mitigate the effects of a pandemic. They are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. 
Sovereign debt risk. Sovereign government and supranational debt involve many of the risks of foreign and emerging markets investments as well as the risk of debt moratorium, repudiation or renegotiation, and the fund may be unable to enforce its rights against the issuers. Sovereign debt risk is increased for emerging market issuers.  
Convertible securities risk. Convertible securities are subject to both stock market risk associated with equity securities and the credit and interest rate risks associated with fixed income securities. Credit risk is the risk that the issuer or obligor will not make timely payments of principal or interest or that its credit may be downgraded or perceived to be less creditworthy. Interest rate risk is the risk that the value of a fixed income security will fall when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. A general rise in interest rates may cause investors to move out of fixed income securities on a large scale, which could adversely affect the price and liquidity of fixed income securities. As the market price of the equity security underlying a convertible security falls, the convertible security tends to trade on the basis of its yield and other fixed income characteristics. As the market price of the equity security underlying a convertible security rises, the convertible security tends to trade on the basis of its equity conversion features.  
Zero coupon bond risk. Zero coupon securities pay no interest during the life of the obligation but trade at prices below their stated maturity value. Because zero coupon securities pay no interest until maturity, their prices may fluctuate more than other types of securities with the same maturity.  
Prepayment or call risk. Many issuers have a right to prepay their fixed income securities. Issuers may be more likely to prepay their securities if interest rates fall. If this happens, the fund will not benefit from the rise in the market price of the securities that normally accompanies a decline in interest rates, and will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on prepaid securities. The fund may also lose any premium it paid to purchase the securities.  
Mortgage-backed and asset-backed securities risk. When market interest rates increase, the market values of mortgage-backed securities decline. At the same time, mortgage refinancings and prepayments slow, which lengthens the effective duration of these securities. As a result, the negative effect of the interest rate increase on the market value of mortgage-backed securities is usually more pronounced than it is for other types of fixed income securities, potentially increasing the volatility of the fund. Conversely, when market interest rates decline, while the value of mortgage-backed securities may increase, the rate of prepayment of the underlying mortgages also tends to increase, which shortens the effective duration of these securities. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations and the value of property that secures the mortgage may decline in value and be insufficient, upon foreclosure, to repay the associated loan. Investments in asset-backed securities are subject to similar risks. The ability of an issuer of asset-backed securities to enforce its security interest in the underlying assets may be limited, and therefore certain asset-backed securities present a heightened level of risk.  
Extension risk. When interest rates rise, repayments of fixed income securities, particularly asset- and mortgage- backed securities, may occur more slowly than anticipated, extending the effective duration of these fixed income securities at below market interest rates and causing their market prices to decline more than they would have declined due to the rise in interest rates alone. This may cause the fund’s share price to be more volatile.  
Valuation risk. The sales price the fund could receive for any particular portfolio investment may differ from the fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. These differences may increase significantly and affect fund investments more broadly during periods of market volatility. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have  
received if the fund had not fair-valued securities or had used a different valuation methodology. The fund’s ability to value its investments may be impacted by technological issues and/or errors by pricing services or other third party service providers. The valuation of the fund’s investments involves subjective judgment. 
Stock market and equity securities risk. The stock markets are volatile and the market prices of the fund’s equity securities may decline generally. Equity securities may include warrants, rights, exchange-traded and over‑the‑counter common stocks, preferred stock, depositary receipts, trust certificates, limited partnership interests and shares of other investment companies, including exchange-traded funds and real estate investment trusts. Equity securities may have greater price volatility than other asset classes, such as fixed income securities, and may fluctuate in price based on actual or perceived changes in a company’s financial condition and overall market and economic conditions and perceptions. If the market prices of the equity securities owned by the fund fall, the value of your investment in the fund will decline.  
Inflation risk. Inflation risk is the risk that the value of assets or income from investments will be worth less in the future as inflation decreases the value of money. The market prices of debt securities generally fall as inflation increases because the purchasing power of the principal and income is expected to be worth less when repaid.  
Market events risk. The market values of securities or other assets will fluctuate, sometimes sharply and unpredictably, due to changes in general market conditions, overall economic trends or events, governmental actions or intervention, actions taken by the U.S. Federal Reserve or foreign central banks, market disruptions caused by trade disputes or other factors, political developments, investor sentiment, the global and domestic effects of a pandemic, and other factors that may or may not be related to the issuer of the security or other asset. Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, public health events, terrorism, natural disasters and other circumstances in one country or region could have profound impacts on global economies or markets. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries or markets directly affected, the value and liquidity of the fund’s investments may be negatively affected.  
The rapid and global spread of a highly contagious novel coronavirus respiratory disease, designated COVID‑19, has resulted in extreme volatility in the financial markets; reduced liquidity of many instruments; restrictions on international and, in some cases, local travel; significant disruptions to business operations (including business closures); strained healthcare systems; disruptions to supply chains, consumer demand and employee availability; and widespread uncertainty regarding the duration and long-term effects of this pandemic. Some sectors of the economy and individual issuers have experienced particularly large losses. In addition, the COVID‑19 pandemic may result in a sustained domestic or even global economic downturn or recession, domestic and foreign political and social instability, damage to diplomatic and international trade relations and increased volatility and/or decreased liquidity in the securities markets. Developing or emerging market countries may be more impacted by the COVID‑19 pandemic as they may have less established health care systems and may be less able to control or mitigate the effects of the pandemic. The ultimate economic fallout from the pandemic, and the long-term impact on economies, markets, industries and individual issuers, are not known. The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks, have taken extraordinary actions to support local and global economies and the financial markets in response to the COVID‑19 pandemic. This and other government intervention into the economy and financial markets to address the COVID‑19 pandemic may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results. Government actions to mitigate the economic impact of the pandemic have resulted in a large expansion of government deficits and debt, the long term consequences of which are not known. The COVID‑19 pandemic could adversely affect the value and liquidity of the fund’s investments, impair the fund’s ability to satisfy redemption requests, and negatively impact the fund’s performance. In addition, the outbreak of COVID‑19, and measures taken to mitigate its effects, could result in disruptions to the services provided to the fund by its service providers. 
LIBOR risk. The fund’s investments, payment obligations, and financing terms may be based on floating rates, such as the London Interbank Offered Rate, or “LIBOR,” which is the offered rate for short-term Eurodollar deposits between major international banks. In 2017, the U.K. Financial Conduct Authority (“FCA”) announced its intention to cease compelling banks to provide the quotations needed to sustain LIBOR after 2021. ICE Benchmark Administration, the administrator of LIBOR, ceased publication of most LIBOR settings on a representative basis at the end of 2021 and is expected to cease publication of a majority of U.S. dollar LIBOR settings on a representative basis after June 30, 2023. In addition, global regulators have announced that, with limited exceptions, no new LIBOR-based contracts should be entered into after 2021. Actions by regulators have resulted in the establishment of alternative reference rates to LIBOR in most major currencies. In March, 2022, the U.S. federal government enacted legislation to establish a process for replacing LIBOR in certain existing contracts that do not already provide for the use of a clearly defined or practicable replacement benchmark rate as described in the legislation. Generally speaking, for contracts that do not contain a fallback provision as described in the legislation, a benchmark replacement recommended by the Federal Reserve Board will effectively automatically replace the USD LIBOR benchmark in the contract after June 30, 2023. The recommended benchmark replacement will be based on the Secured Overnight Financing Rate (SOFR) published by the Federal Reserve Bank of New York, including certain spread adjustments and benchmark replacement conforming changes. Various financial industry groups have been planning for the transition away from LIBOR, but there remains uncertainty regarding the impact of the transition from LIBOR on the fund’s transactions and the financial markets generally. The transition away from LIBOR may lead to increased volatility and illiquidity in markets that currently rely on LIBOR and may adversely affect the fund’s performance. The transition may also result in a reduction in the value of certain LIBOR-based investments held by the fund or reduce the effectiveness of related transactions such as hedges. Any such effects of the transition away from LIBOR, as well as other unforeseen effects, could result in losses for the fund. Since the usefulness of LIBOR as a benchmark could also deteriorate during the transition period, effects could occur at any time.  
Portfolio turnover risk. Active and frequent trading may increase a shareholder’s tax liability and the fund’s transaction costs, which could detract from fund performance.  
Redemption risk. The fund may experience heavy redemptions that could cause the fund to liquidate its assets at inopportune times or unfavorable prices or increase or accelerate taxable gains or transaction costs and may negatively affect the fund’s net asset value, performance, or ability to satisfy redemptions in a timely manner, which could cause the value of your investment to decline.  
Cybersecurity risk. 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 manager, the subadviser 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 fund, the manager, and the subadviser have 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 the manager. Cybersecurity incidents may result in financial losses to the fund and its shareholders, and substantial costs may be incurred in order to prevent any 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 manager, the subadviser and their service providers are subject to the risk of cyber incidents occurring from time to time. 
These and other risks are discussed in more detail in the Prospectus or in the Statement of Additional Information. 
Risk Lose Money [Text] rr_RiskLoseMoney You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or by any bank or government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The accompanying 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 I shares. The table shows the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes updated performance information, including its current net asset value, available at www.franklintempleton.com/mutualfunds (select fund and share class), or by calling the fund at 877‑6LM‑FUND/656‑3863. 
The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.  
Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown. 
The fund acquired the assets and liabilities of Diamond Hill High Yield Fund, a series of the Diamond Hill Funds (the “Predecessor Fund”) on July 30, 2021. As a result of the reorganization, the Fund is the accounting successor of the Predecessor Fund. Performance shown for the fund’s Class A shares, Class I shares and Class IS shares for the periods prior to July 30, 2021, is the performance of the Predecessor Fund’s Investor Class, Class I shares and Class Y shares, respectively. 
Prior to calendar year 2016, the bar chart and table reflect the past performance of Diamond Hill High Yield Fund, LP (the “High Yield Partnership”), a private fund managed with full investment authority by the Predecessor Fund’s manager. The Predecessor Fund was managed in all material respects in a manner equivalent to the management of the High Yield Partnership. The Predecessor Fund’s objectives, policies, guidelines and restrictions were in all material respects equivalent to those of the High Yield Partnership, and the Predecessor Fund was created for reasons entirely unrelated to the establishment of a performance record. The assets of the High Yield Partnership were converted, based on their value on December 31, 2015, into assets of the Predecessor Fund prior to commencement of operations of the Predecessor Fund. The performance of the High Yield Partnership was restated to reflect the net expenses and maximum applicable sales charge of the Predecessor Fund for its initial years of investment operations. The High Yield Partnership was not registered under the Investment Company Act of 1940, as amended (the “1940 Act”), and therefore was not subject to certain investment restrictions imposed by the 1940 Act. Further, the Predecessor Fund was subject to certain restrictions under the Code to which the High Yield Partnership was not subject. If the High Yield Partnership had been registered under the 1940 Act and had been subject to the provisions of the Code applicable to the Predecessor Fund, its performance may have been adversely affected. Performance of the Predecessor Fund prior to calendar year 2016, is measured from December 4, 2014, the inception of the High Yield Partnership, and is not the performance of the Predecessor Fund. 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart shows changes in the fund’s performance from year to year for Class I shares. The table shows the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 877‑6LM‑FUND/656‑3863
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.franklintempleton.com/mutualfunds (select fund and share class)
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 Total returns (%) Before taxes
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown. 
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Calendar Years ended December 31 Best Quarter (06/30/2020): 13.38 Worst Quarter (03/31/2020): (11.14)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns (%) (for periods ended December 31, 2021)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after‑tax returns are shown only for Class I shares, are calculated using the historical highest 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, and the 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.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The after‑tax returns are shown only for Class I shares, 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, and the 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. After‑tax returns for classes other than Class I will vary from returns shown for Class I.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
The after‑tax returns are shown only for Class I shares, 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, and
the 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. After‑tax returns for classes other than Class I will vary from returns shown for Class I.
BrandywineGLOBAL - HIGH YIELD FUND | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Small account fee ($) rr_MaximumAccountFee $ 15 [2]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 1.56%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 3.07% [3]
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets (1.35%) [4]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.72% [5]
1 year rr_ExpenseExampleYear01 $ 275
3 years rr_ExpenseExampleYear03 821
5 years rr_ExpenseExampleYear05 1,493
10 years rr_ExpenseExampleYear10 2,786
1 year rr_ExpenseExampleNoRedemptionYear01 175
3 years rr_ExpenseExampleNoRedemptionYear03 821
5 years rr_ExpenseExampleNoRedemptionYear05 1,493
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,786
BrandywineGLOBAL - HIGH YIELD FUND | Class R  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther none [1]
Small account fee ($) rr_MaximumAccountFee none [2]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.31% [6]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 1.32% [3]
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets [4]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 1.32% [5]
1 year rr_ExpenseExampleYear01 $ 134
3 years rr_ExpenseExampleYear03 418
5 years rr_ExpenseExampleYear05 723
10 years rr_ExpenseExampleYear10 1,589
1 year rr_ExpenseExampleNoRedemptionYear01 134
3 years rr_ExpenseExampleNoRedemptionYear03 418
5 years rr_ExpenseExampleNoRedemptionYear05 723
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,589
BrandywineGLOBAL - HIGH YIELD FUND | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther none [1]
Small account fee ($) rr_MaximumAccountFee none [2]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.16%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 0.67% [3]
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets [4]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 0.67%
1 year rr_ExpenseExampleYear01 $ 68
3 years rr_ExpenseExampleYear03 214
5 years rr_ExpenseExampleYear05 373
10 years rr_ExpenseExampleYear10 834
1 year rr_ExpenseExampleNoRedemptionYear01 68
3 years rr_ExpenseExampleNoRedemptionYear03 214
5 years rr_ExpenseExampleNoRedemptionYear05 373
10 years rr_ExpenseExampleNoRedemptionYear10 $ 834
2015 rr_AnnualReturn2015 0.28%
2016 rr_AnnualReturn2016 14.62%
2017 rr_AnnualReturn2017 10.36%
2018 rr_AnnualReturn2018 1.16%
2019 rr_AnnualReturn2019 15.44%
2020 rr_AnnualReturn2020 13.62%
2021 rr_AnnualReturn2021 5.38%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.38%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.14%)
1 year rr_AverageAnnualReturnYear01 5.38%
5 years rr_AverageAnnualReturnYear05 9.06%
Since inception rr_AverageAnnualReturnSinceInception 8.49%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 04, 2014
BrandywineGLOBAL - HIGH YIELD FUND | Class IS  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther none [1]
Small account fee ($) rr_MaximumAccountFee none [2]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.05%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 0.56% [3]
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets [4]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 0.56% [5]
1 year rr_ExpenseExampleYear01 $ 57
3 years rr_ExpenseExampleYear03 179
5 years rr_ExpenseExampleYear05 312
10 years rr_ExpenseExampleYear10 701
1 year rr_ExpenseExampleNoRedemptionYear01 57
3 years rr_ExpenseExampleNoRedemptionYear03 179
5 years rr_ExpenseExampleNoRedemptionYear05 312
10 years rr_ExpenseExampleNoRedemptionYear10 $ 701
1 year rr_AverageAnnualReturnYear01 5.48%
5 years rr_AverageAnnualReturnYear05 9.21%
Since inception rr_AverageAnnualReturnSinceInception 8.63%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 04, 2014
BrandywineGLOBAL - HIGH YIELD FUND | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.50% [7],[8]
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther none [1],[9]
Small account fee ($) rr_MaximumAccountFee $ 15 [2]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.20%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 0.96% [3]
Fees waived and/or expenses reimbursed rr_FeeWaiverOrReimbursementOverAssets [4]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses rr_NetExpensesOverAssets 0.96% [5]
1 year rr_ExpenseExampleYear01 $ 445
3 years rr_ExpenseExampleYear03 645
5 years rr_ExpenseExampleYear05 862
10 years rr_ExpenseExampleYear10 1,487
1 year rr_ExpenseExampleNoRedemptionYear01 445
3 years rr_ExpenseExampleNoRedemptionYear03 645
5 years rr_ExpenseExampleNoRedemptionYear05 862
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,487
1 year rr_AverageAnnualReturnYear01 1.48%
5 years rr_AverageAnnualReturnYear05 7.99%
Since inception rr_AverageAnnualReturnSinceInception 7.66%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 04, 2014
BrandywineGLOBAL - HIGH YIELD FUND | Return after taxes on distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 1.93%
5 years rr_AverageAnnualReturnYear05 5.58%
Since inception rr_AverageAnnualReturnSinceInception 5.47%
BrandywineGLOBAL - HIGH YIELD FUND | Return after taxes on distributions and sale of fund shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 3.18%
5 years rr_AverageAnnualReturnYear05 5.43%
Since inception rr_AverageAnnualReturnSinceInception 5.22%
BrandywineGLOBAL - HIGH YIELD FUND | ICE BofA US High Yield Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 5.36%
5 years rr_AverageAnnualReturnYear05 6.10%
Since inception rr_AverageAnnualReturnSinceInception 5.87%
[1]
Maximum deferred sales charge (load) may be reduced over time.
[2]
If the value of your account is below $1,000 ($250 for retirement plans that are not employer-sponsored), the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly by the fund or your Service Agent (with an annual maximum of $15.00 per account). Please contact your Service Agent or the fund for more information.
[3]
Total annual fund operating expenses do not correlate with the ratios of total net expenses to average net assets reported in the financial highlights tables in the fund’s Prospectus, as certain expenses are estimated for the fiscal year and as the ratios of total net expenses to average net assets reported in the financial highlights do not include acquired fund fees and expenses.
[4]
The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage commissions, dividend expense on short sales, taxes, extraordinary expenses and acquired fund fees and expenses) so that the ratio of total annual fund operating expenses will not exceed 0.96% for Class A shares, 1.71% for Class C shares, 1.31% for Class R shares, 0.67% for Class I shares and 0.55% for Class IS shares, subject to recapture as described below. In addition, the ratio of total annual fund operating expenses for Class IS shares will not exceed the ratio of total annual fund operating expenses for Class I shares, subject to recapture as described below. These arrangements cannot be terminated prior to December 31, 2023 without the Board of Trustees’ consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class within three years after the fiscal year in which the manager earned the fee or incurred the expense if the class’ total annual fund operating expenses have fallen to a level below the limits described above. In no case will the manager recapture any amount that would result, on any particular business day of the fund, in the class’ total annual fund operating expenses exceeding the applicable limits described above or any other lower limit then in effect. In addition, the manager has agreed to waive the fund’s management fee to an extent sufficient to offset the net management fee payable in connection with any investment in an affiliated money market fund. This management fee waiver is not subject to the recapture provision discussed above.
[5]
Total annual fund operating expenses (after waiving fees and/or reimbursing expenses, as applicable) are higher than the expense cap amounts for Class C, Class R and Class IS shares as a result of acquired fund fees and expenses.
[6]
Other expenses for Class R shares are estimated for the current fiscal year. Actual expenses may differ from estimates.
[7]
Shareholders purchasing Class A shares through certain Service Agents or in certain types of accounts may be eligible for a waiver of the sales charge. For additional information, see “Additional information about each share class — Sales charges” in the Prospectus.
[8]
The sales charge is waived for shareholders purchasing Class A shares through accounts where Franklin Distributors is the broker-dealer of record (“Distributor Accounts”).
[9]
You may buy Class A shares in amounts of $1,000,000 or more at net asset value (without an initial sales charge), but if you redeem those shares within 18 months of their purchase, you will pay a contingent deferred sales charge of 1.00%.