Objective, Primary [Text Block]

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Risk/Return [Heading]

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WESTERN ASSET CALIFORNIA MUNICIPALS FUND

Objective [Heading]

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Investment objective

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The fund seeks to provide California investors with as high a level of current income exempt from regular federal income taxes and California state personal income taxes as is consistent with the preservation of capital.

Expense [Heading]

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Fees and expenses of the fund

Expense Narrative [Text Block]

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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 27 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 101 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]

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Shareholder fees(fees paid directly from your investment)

Operating Expenses Caption [Text]

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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

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December 31, 2023

Portfolio Turnover [Heading]

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Portfolio turnover.

Portfolio Turnover [Text Block]

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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 most recent fiscal year, the fund’s portfolio turnover rate was 17% of the average value of its portfolio.

Portfolio Turnover, Rate

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17.00%

Expenses Deferred Charges [Text Block]

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You may buy Class A shares in amounts of $250,000 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]

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Expense Breakpoint, Minimum Investment Required [Amount]

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$ 100,000

Other Expenses, New Fund, Based on Estimates [Text]

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Other expenses for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

Expense Example [Heading]

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Example

Expense Example Narrative [Text Block]

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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]

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Number of years you own your shares ($)

Expense Example, No Redemption, By Year, Caption [Text]

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Number of years you own your shares ($)

Strategy [Heading]

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Principal investment strategies

Strategy Narrative [Text Block]

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Under normal circumstances, the fund invests at least 80% of its assets in California municipal securities and other investments with similar economic characteristics, the interest on which is exempt from regular federal income tax and California state personal income tax but which may be subject to the federal alternative minimum tax. The fund’s 80% policy may not be changed without a shareholder vote.

California municipal securities include debt obligations issued by the State of California and its political subdivisions, agencies and public authorities, certain other governmental issuers (such as Puerto Rico, the U.S. Virgin Islands and Guam) and other qualifying issuers. These securities include participation or other interests in municipal securities issued or backed by banks, insurance companies and other financial institutions.

The fund normally invests in intermediate-term and long-term municipal securities that have remaining maturities from one to more than thirty years at the time of purchase. The fund focuses on investment grade bonds (that is, securities rated in the Baa/BBB categories or above or, if unrated or deemed to be unrated by the subadviser, determined to be of comparable credit quality by the subadviser), but may invest up to 20% of its assets in below investment grade bonds (commonly known as “high yield” or “junk” bonds).

Some municipal securities, such as general obligation issues, are backed by the issuer’s taxing authority, while other municipal securities, such as revenue issues, are backed only by revenues from certain facilities or other sources and not by the issuer itself.

The fund may also invest in securities of other open‑end or closed‑end investment companies, including exchange-traded funds (“ETFs”), that invest primarily in municipal securities.

Instead of, and/or in addition to, investing directly in particular securities, the fund may use instruments such as derivatives, including options, futures contracts and inverse floating rate instruments issued in tender option bond transactions, and other synthetic instruments that are intended to provide economic exposure to the securities or the issuer or to be used as a hedging technique. The fund may use one or more types of these instruments without limit, except that these instruments are taken into account when determining compliance with the fund’s 80% policy. For additional information regarding derivatives, see “More on the fund’s investment strategies, investments and risks—Derivatives” in the Prospectus.

The fund may also engage in a variety of transactions using derivatives in order to change the investment characteristics of its portfolio (such as shortening or lengthening duration) and for other purposes. The fund may leverage its assets by investing proceeds received through tender option bond transactions, which is considered a form of borrowing. See “More on the fund’s investment strategies, investments and risks—Tender option bonds” in the Prospectus.

The fund is classified as “non‑diversified,” which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund.

Risk [Heading]

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Principal risks

Risk Narrative [Text Block]

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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.

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.

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.

Risks associated with focusing on investments in California municipal securities. The fund focuses its investments in California municipal securities. The fund may be affected significantly by adverse economic, political or other events affecting California municipal issuers. The recession that ended in 2009 had a severe and negative impact on the State of California, causing a significant deterioration in California’s economic base. California’s economic and fiscal problems heighten the risks of investing in California municipal securities, including the risks of downgrades, market illiquidity and issuer defaults. Also, the fund may be more volatile than a more geographically diverse fund.

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.

Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains when market prices, interest rates, or the derivatives themselves, behave in a way not anticipated by the fund’s subadviser. Using derivatives also can have a leveraging effect and increase fund volatility. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. Derivatives may not be available at the time or price desired, may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Derivatives are generally subject to the risks applicable to the assets, rates, indices or other indicators underlying the derivative. The value of a derivative may fluctuate more than the underlying assets, rates, indices or other indicators to which it relates. Use of derivatives may have different tax consequences for the fund than an investment in the underlying security, and those differences may affect the amount, timing and character of income distributed to shareholders, including the proportion of income consisting of exempt-interest dividends. The U.S. government and foreign governments are in the process of adopting and implementing regulations governing derivatives markets, including mandatory clearing of certain derivatives, margin and reporting requirements. The ultimate impact of the regulations remains unclear. Additional regulation of derivatives may make derivatives more costly, limit their availability or utility, otherwise adversely affect their performance or disrupt markets.

Leverage risk. The value of your investment may be more volatile if the fund borrows or uses instruments, such as derivatives, that have a leveraging effect on the fund’s portfolio. Other risks described in the Prospectus also will be compounded because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had. The fund may also have to sell assets at inopportune times to satisfy its obligations created by the use of leverage or derivatives. The use of leverage is considered to be a speculative investment practice and may result in the loss of a substantial amount, and possibly all, of the fund’s assets. In addition, the fund’s portfolio will be leveraged if it exercises its right to delay payment on a redemption, and losses will result if the value of the fund’s assets declines between the time a redemption request is deemed to be received by the fund and the time the fund liquidates assets to meet redemption requests.

Tender option bond risk. Tender option bond (“TOB”) transactions expose the fund to leverage and credit risk, and generally involve greater risk than direct investments in fixed rate municipal bonds, including the risk of loss of principal. The interest payments that the fund would typically receive in connection with a TOB transaction (“inverse floaters”) vary inversely with short-term interest rates and will be reduced (and potentially eliminated) when short-term interest rates increase. In addition, the fund will be subject to leverage risk to the extent that the fund uses the proceeds that it receives from a TOB transaction to invest in other securities. The fund’s investment in a TOB will generally underperform the market for fixed rate municipal securities when interest rates rise. The value and market for such inverse floaters can be volatile and can have limited liquidity. Investments in inverse floaters issued in TOB transactions are derivative instruments and, therefore, are also subject to the risks generally applicable to investments in derivatives.

Illiquidity risk. Some assets held by the fund may be or become impossible or difficult to sell and some assets that the fund wants to invest in may be impossible or difficult to purchase, particularly during times of market turmoil or due to adverse changes in the conditions of a particular issuer.

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. Recent federal banking regulations may also cause certain dealers to reduce their inventories of certain securities, which may further decrease the fund’s ability to buy or sell such securities. During times of market turmoil, there have been, and may be, no buyers or sellers for securities in entire asset classes. 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. The fund may not receive its proceeds from the sale of certain securities for an extended period (for example, several weeks or even longer).

Tax risk. The income on the fund’s municipal securities could become subject to federal income and/or California state personal income taxes due to noncompliant conduct by issuers, unfavorable legislation or litigation or adverse interpretations by regulatory authorities. All or a portion of the fund’s dividends that are exempt from regular federal income tax may nevertheless be taken into account for purposes of the federal alternative minimum tax.

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.

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.

Non‑diversification risk. The fund is classified as “non‑diversified,” which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.

Risks relating to investments in municipal securities. Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities, potentially resulting in defaults. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors. In the past, a number of municipal issuers defaulted on obligations, were downgraded or commenced insolvency proceedings. Financial difficulties of municipal issuers may experience a resurgence, particularly in the event of economic or market turmoil or a recession.

Investing in ETFs risk. Unlike shares of typical mutual funds or unit investment trusts, shares of ETFs are traded on an exchange and may trade throughout a trading day. ETFs are bought and sold based on market values and not at net asset value, and therefore may trade at either a premium or discount to net asset value and may experience volatility in certain market conditions. The fund will pay brokerage commissions in connection with the purchase and sales of shares of ETFs. In addition, the fund will indirectly bear its pro rata share of fees and expenses incurred by an ETF in which it invests, including advisory fees. These expenses are in addition to management fees and other expenses that the fund bears directly in connection with its own operations. Certain ETFs are also subject to portfolio management risk. Investments in ETFs are subject to the risk that the listing exchange may halt trading of an ETF’s shares, in which case the fund would be unable to sell its ETF shares unless and until trading is resumed.

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.

Portfolio management risk. The value of your investment may decrease if the subadviser’s judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates or other market factors, 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.

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, the manager and/or the subadviser. Cybersecurity incidents may result in financial losses to the fund and its shareholders, and substantial costs may be incurred in order to prevent or mitigate 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]

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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]

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An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or by any bank or government agency.

Risk Nondiversified Status [Text]

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Bar Chart and Performance Table [Heading]

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Performance

Performance Narrative [Text Block]

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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 A 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 and an average. 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.

Performance Information Illustrates Variability of Returns [Text]

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The bar chart shows changes in the fund’s performance from year to year for Class A 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 and an average.

Performance Availability Phone [Text]

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877‑6LM‑FUND/656‑3863

Performance Availability Website Address [Text]

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www.franklintempleton.com/mutualfunds (select fund and share class)

Performance Past Does Not Indicate Future [Text]

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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]

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Total returns (%) Before taxes

Bar Chart Does Not Reflect Sales Loads [Text]

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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]

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Calendar Years ended December 31 Best Quarter (03/31/2014): 3.66 Worst Quarter (06/30/2013): (4.23) The year-to-date return as of the most recent calendar quarter, which ended March 31, 2022, was (6.32)

Performance Table Heading

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Average annual total returns (%)(for periods ended December 31, 2021)

Performance Table Uses Highest Federal Rate

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Performance Table One Class of after Tax Shown [Text]

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The after‑tax returns are shown only for Class A 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. After‑tax returns for classes other than Class A will vary from returns shown for Class A. Returns after taxes on distributions and sale of fund shares are higher than returns before taxes for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of fund shares.

Performance Table Explanation after Tax Higher

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Returns after taxes on distributions and sale of fund shares are higher than returns before taxes for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of fund shares.

Performance Table Narrative

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Western Asset California Municipals Fund | Class A

Maximum sales charge (load) imposed on purchases (as a % of offering price)

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rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.75%

^[1],[2]

Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)

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none

^[3],[4]

rr_MaximumAccountFee

$ 15

^[5]

rr_ManagementFeesOverAssets

0.50%

rr_DistributionAndService12b1FeesOverAssets

0.15%

rr_OtherExpensesOverAssets

0.12%

rr_ExpensesOverAssets

0.77%

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_FeeWaiverOrReimbursementOverAssets

^[6]

rr_NetExpensesOverAssets

0.77%

rr_ExpenseExampleYear01

$ 451

rr_ExpenseExampleYear03

612

rr_ExpenseExampleYear05

787

rr_ExpenseExampleYear10

1,293

rr_ExpenseExampleNoRedemptionYear01

451

rr_ExpenseExampleNoRedemptionYear03

612

rr_ExpenseExampleNoRedemptionYear05

787

Year to Date Return, Label

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$ 1,293

2012

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9.26%

2013

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(3.89%)

2014

rr_AnnualReturn2014

9.84%

2015

rr_AnnualReturn2015

2.85%

2016

rr_AnnualReturn2016

(0.08%)

2017

rr_AnnualReturn2017

4.91%

2018

rr_AnnualReturn2018

0.41%

2019

rr_AnnualReturn2019

7.67%

2020

rr_AnnualReturn2020

3.75%

2021

rr_AnnualReturn2021

2.09%

rr_YearToDateReturnLabel

year‑to‑date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2022

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(6.32%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2014

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

3.66%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2013

Lowest Quarterly Return

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(4.23%)

rr_AverageAnnualReturnYear01

(2.25%)

rr_AverageAnnualReturnYear05

2.84%

Western Asset California Municipals Fund | Class C

rr_AverageAnnualReturnYear10

3.15%

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

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%

^[3]

rr_MaximumAccountFee

$ 15

^[5]

rr_ManagementFeesOverAssets

0.50%

rr_DistributionAndService12b1FeesOverAssets

0.70%

rr_OtherExpensesOverAssets

0.11%

rr_ExpensesOverAssets

1.31%

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_FeeWaiverOrReimbursementOverAssets

^[6]

rr_NetExpensesOverAssets

1.31%

rr_ExpenseExampleYear01

$ 233

rr_ExpenseExampleYear03

414

rr_ExpenseExampleYear05

717

rr_ExpenseExampleYear10

1,430

rr_ExpenseExampleNoRedemptionYear01

133

rr_ExpenseExampleNoRedemptionYear03

414

rr_ExpenseExampleNoRedemptionYear05

717

rr_ExpenseExampleNoRedemptionYear10

$ 1,430

rr_AverageAnnualReturnYear01

0.49%

rr_AverageAnnualReturnYear05

3.16%

Western Asset California Municipals Fund | Class FI

rr_AverageAnnualReturnYear10

3.02%

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

^[3]

rr_MaximumAccountFee

none

^[5]

rr_ManagementFeesOverAssets

0.50%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.26%

^[7]

rr_ExpensesOverAssets

1.01%

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_FeeWaiverOrReimbursementOverAssets

(0.16%)

^[6]

rr_NetExpensesOverAssets

0.85%

rr_ExpenseExampleYear01

$ 87

rr_ExpenseExampleYear03

306

rr_ExpenseExampleYear05

543

rr_ExpenseExampleYear10

1,222

rr_ExpenseExampleNoRedemptionYear01

rr_ExpenseExampleNoRedemptionYear03

306

rr_ExpenseExampleNoRedemptionYear05

543

Western Asset California Municipals Fund | Class I

rr_ExpenseExampleNoRedemptionYear10

$ 1,222

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

^[3]

rr_MaximumAccountFee

none

^[5]

rr_ManagementFeesOverAssets

0.50%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.13%

rr_ExpensesOverAssets

0.63%

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[6]

rr_NetExpensesOverAssets

0.60%

rr_ExpenseExampleYear01

$ 61

rr_ExpenseExampleYear03

198

rr_ExpenseExampleYear05

347

rr_ExpenseExampleYear10

783

rr_ExpenseExampleNoRedemptionYear01

rr_ExpenseExampleNoRedemptionYear03

198

rr_ExpenseExampleNoRedemptionYear05

347

rr_ExpenseExampleNoRedemptionYear10

$ 783

rr_AverageAnnualReturnYear01

2.25%

rr_AverageAnnualReturnYear05

3.91%

Western Asset California Municipals Fund | Class IS

rr_AverageAnnualReturnYear10

3.75%

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

^[3]

rr_MaximumAccountFee

none

^[5]

rr_ManagementFeesOverAssets

0.50%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.09%

rr_ExpensesOverAssets

0.59%

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_FeeWaiverOrReimbursementOverAssets

(0.04%)

^[6]

rr_NetExpensesOverAssets

0.55%

rr_ExpenseExampleYear01

$ 56

rr_ExpenseExampleYear03

185

rr_ExpenseExampleYear05

326

rr_ExpenseExampleYear10

735

rr_ExpenseExampleNoRedemptionYear01

rr_ExpenseExampleNoRedemptionYear03

185

rr_ExpenseExampleNoRedemptionYear05

326

rr_ExpenseExampleNoRedemptionYear10

$ 735

rr_AverageAnnualReturnYear01

2.35%

rr_AverageAnnualReturnYear05

Western Asset California Municipals Fund | Return after taxes on distributions | Class A

rr_AverageAnnualReturnYear10

Since inception

rr_AverageAnnualReturnSinceInception

2.90%

Inception date

rr_AverageAnnualReturnInceptionDate

Aug. 09, 2019

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

(2.53%)

rr_AverageAnnualReturnYear05

2.68%

Western Asset California Municipals Fund | Return after taxes on distributions and sale of fund shares | Class A

rr_AverageAnnualReturnYear10

3.07%

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

(0.25%)

rr_AverageAnnualReturnYear05

2.89%

Western Asset California Municipals Fund | Bloomberg California Municipal Bond Index (reflects no deduction for fees, expenses or taxes)

rr_AverageAnnualReturnYear10

3.25%

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

1.22%

^[8]

rr_AverageAnnualReturnYear05

4.12%

^[8]

Western Asset California Municipals Fund | Lipper California Municipal Debt Funds Category Average (reflects fees and expenses but no deduction for sales charges or taxes)

rr_AverageAnnualReturnYear10

3.98%

^[8]

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

2.35%

^[9]

rr_AverageAnnualReturnYear05

4.22%

^[9]