485BPOS

As filed with the U.S. Securities and Exchange Commission on October 11, 2018

Securities Act File No. 33-34929

Investment Company Act File No. 811-06110

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	☒
Pre-Effective Amendment No.	☐
Post-Effective Amendment No. 115	☒

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940	☒
Amendment No. 117

(Check appropriate box or boxes)

Western Asset Funds, Inc.

(Exact Name of Registrant as Specified in Charter)

100 International Drive, Baltimore, Maryland	21202
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s Telephone Number, including Area Code (410) 539-0000

Robert I. Frenkel

Legg Mason & Co., LLC

100 First Stamford Place

Stamford, Connecticut 06902

(Name and Address of Agent for Service)

COPY TO:

Bryan Chegwidden, Esq.

Ropes & Gray LLP

1211 Avenue of the Americas

New York, New York 10036

Continuous

(Approximate Date of Proposed Offering)

It is proposed that this filing will become effective:

☒ immediately upon filing pursuant to paragraph (b)

☐ on              pursuant to paragraph (b)

☐ 60 days after filing pursuant to paragraph (a)(1)

☐ on              pursuant to paragraph (a)(1)

☐ 75 days after filing pursuant to paragraph (a)(2)

☐ on              pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

☐ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

Explanatory Note

This filing relates solely to Western Asset High Yield Fund, Western Asset Intermediate Bond Fund, and Western Asset Total Return Unconstrained Fund.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “Securities Act”), and the Investment Company Act of 1940, as amended, the Registrant, Western Asset Funds, Inc., hereby certifies that it meets all the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act and has duly caused this Post-Effective Amendment to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Baltimore, State of Maryland on this 11th day of October, 2018.

	WESTERN ASSET FUNDS, INC.
By:	/s/ Jane Trust
	Jane Trust
	President and Chief Executive Officer

Pursuant to the requirements of the Securities Act, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated below on October 11, 2018.

Signature	Title
/s/ Robert Abeles, Jr.* Robert Abeles, Jr.	Director
/s/ Anita L. DeFrantz* Anita L. DeFrantz	Director
/s/ Avedick B. Poladian* Avedick B. Poladian	Director
/s/ William E.B. Siart* William E.B. Siart	Director
/s/ Jaynie M. Studenmund* Jaynie M. Studenmund	Director
/s/ Ronald L. Olson* Ronald L. Olson	Director
/s/ Jane Trust Jane Trust	President and Chief Executive Officer
/s/ Richard F. Sennett Richard F. Sennett	Principal Financial Officer and Treasurer

By:	/s/ Richard F. Sennett
	Richard F. Sennett

*Attorney-in-Fact pursuant to Powers of

Attorney previously filed

Date: October 11, 2018

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	May 31, 2018
Registrant Name	dei_EntityRegistrantName	WESTERN ASSET FUNDS INC
Central Index Key	dei_EntityCentralIndexKey	0000863520
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Sep. 24, 2018
Document Effective Date	dei_DocumentEffectiveDate	Sep. 28, 2018
Prospectus Date	rr_ProspectusDate	Sep. 28, 2018

XML

Western Asset High Yield Fund

WESTERN ASSET<br/>HIGH YIELD FUND

<b>Investment objective</b>

Maximize total return, consistent with prudent investment management.

<b>Fees and expenses of the fund</b>

The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

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 Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your Service Agent, in the fund’s Prospectus on page 26 under the heading “Sales charges,” 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 83 under the heading “Sales Charge Waivers and Reductions for Class A or Class A2 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 LMIS 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.

<b>Shareholder fees</b><br/>(fees paid directly from your investment)

Shareholder Fees - Western Asset High Yield Fund - USD ($)		Class A		Class A2		Class C	Class FI	Class R	Class I	Class IS
Maximum sales charge (load) imposed on purchases (as a % of offering price)		4.25%	[1],[2]	4.25%		none	none	none	none	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	[3]	none	[4]	none	[4]	1.00%	none	none	none	none
Small account fee ($)	[5]	$ 15		$ 15		$ 15	none	none	none	none

<b>Annual fund operating expenses (%)</b><br/>(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Western Asset High Yield Fund		Class A		Class A2		Class C		Class FI		Class R		Class I		Class IS
Management fees		0.55%		0.55%		0.55%		0.55%		0.55%		0.55%		0.55%
Distribution and/or service (12b-1) fees		0.25%		0.25%		1.00%		0.25%		0.50%		none		none
Other expenses		0.21%		0.19%		0.21%		0.33%	[1]	0.44%	[2]	0.20%		0.14%
Total annual fund operating expenses		1.01%	[3]	0.99%	[3]	1.76%	[3]	1.13%		1.49%	[3]	0.75%	[3]	0.69%	[3]
Fees waived and/or expenses reimbursed			[4]		[4]		[4]	(0.11%)	[4]	(0.17%)	[4]		[5]	(0.02%)	[4]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	[6]	1.01%		0.99%		1.76%		1.02%		1.32%		0.75%		0.67%

<b>Example</b>

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

• 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:

<b>Number of years you own your shares ($)</b>

Expense Example - Western Asset High Yield Fund - USD ($)	1 year	3 years	5 years	10 years
Class A	524	734	960	1,610
Class A2	522	728	950	1,587
Class C	279	555	955	2,075
Class FI	104	348	611	1,363
Class R	134	454	796	1,763
Class I	77	240	417	930
Class IS	68	219	382	857

<b>Number of years you own your shares ($)</b>

Expense Example, No Redemption - Western Asset High Yield Fund - USD ($)	1 year	3 years	5 years	10 years
Class A	524	734	960	1,610
Class A2	522	728	950	1,587
Class C	179	555	955	2,075
Class FI	104	348	611	1,363
Class R	134	454	796	1,763
Class I	77	240	417	930
Class IS	68	219	382	857

Portfolio turnover.

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 68% of the average value of its portfolio.

<b>Principal investment strategies</b>

Under normal market conditions, the fund will invest at least 80% of its net assets in U.S. dollar denominated debt or fixed income securities that are rated below investment grade at the time of purchase by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”) or are of a comparable quality as determined by the subadviser. The fund considers securities that are rated below the Baa or BBB categories to be rated below investment grade. Securities rated below investment grade are commonly known as “junk bonds” or “high yield securities.”

In deciding among the securities in which the fund may invest, the subadviser takes into account the credit quality, country of issue, interest rate, liquidity, maturity and yield of a security as well as other factors, including the fund’s effective duration and prevailing and anticipated market conditions. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of particular features of a security (for example, some bonds can be prepaid by the issuer.) The fund is permitted to invest up to 20% of its total assets in non-U.S. dollar denominated non-U.S. securities.

The fund may also enter into various exchange-traded and over-the-counter derivative transactions for both hedging and non-hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, bond and interest rate futures, options on bond and interest rate futures, futures, swaps, foreign currency futures, forwards and options.

In particular, the fund may use interest rate swaps, credit default swaps (including buying and selling credit default swaps on individual securities and/or baskets of securities), options (including options on credit default swaps), and/or futures contracts to a significant extent, although the amounts invested in these instruments may change from time to time. Other instruments may also be used to a significant extent from time to time.

The fund may use currency related transactions involving futures contracts (sometimes referred to as “futures”), options on futures contracts, indexed securities and other derivative instruments (collectively, “Financial Instruments”). These Financial Instruments may be used without limit, for either hedging purposes, or to implement a currency investment strategy.

<b>Principal risks</b>

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 value 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, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. If the value of the securities owned by the fund falls, 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. Interest rates have been historically low, so the fund faces a heightened risk that interest rates may rise. 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.

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 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. Subordinated securities 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, tend to be less liquid and are more difficult to value than higher grade securities. 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, currencies, or the derivatives themselves behave in a way not anticipated by the fund. 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 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. 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.

Credit default swap contracts involve heightened risks and may result in losses to the fund. Credit default swaps may be illiquid and difficult to value, and they increase credit risk since the fund has exposure to both the issuer whose credit is the subject of the swap and the counterparty to the swap.

Leveraging 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. 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.

Liquidity risk. Some assets held by the fund may be 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 recently 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, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of certain securities for an extended period (for example, several weeks or even longer).

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. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. 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 and political or financial instability. Lack of information may also affect the value of these securities. 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 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 fully developed and are less stable than those of more developed countries. Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by banks, agents and depositories that are less developed than those in the United States. 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.

Currency risk. 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 conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls and speculation.

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 on prepaid 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.

Risk of investing in fewer issuers. To the extent the fund invests its assets in a small number of issuers, the fund will be more susceptible to negative events affecting those issuers.

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. 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.

Market events risk. In the past decade financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; declines in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment.

The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks, have taken steps to support financial markets, including by keeping interest rates at historically low levels. This and other government intervention may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results. The Federal Reserve has reduced its market support activities and recently has begun raising interest rates. Certain foreign governments and central banks are implementing or discussing so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the fund invests.

Policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation and may in some instances contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, 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 directly affected, the value and liquidity of the fund’s investments may be negatively affected.

Hedging risk. There can be no assurance that the fund will engage in hedging transactions at any given time, even under volatile market conditions, or that any hedging transactions the fund engages in will be successful. Hedging transactions involve costs and may reduce gains or result in losses.

Portfolio management risk. The value of your investment may decrease if the subadvisers’ judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect, or if there are imperfections, errors or limitations in the tools and data used by the subadvisers. 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 subadvisers 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 at a loss or depressed value, which could cause the value of your investment to decline.

Cybersecurity risk. Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, customer data (including private shareholder information), or proprietary information, or cause the fund, the manager, the subadvisers 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.

These and other risks are discussed in more detail in the Prospectus or in the Statement of Additional Information.

<b>Performance</b>

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.leggmason.com/mutualfunds (select fund and share class), or by calling the fund at 1-877-721-1926.

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.

<b>Total returns</b> (%)<br/>Before taxes

Calendar Years ended December 31

Best Quarter (06/30/2009): 24.12    Worst Quarter (12/31/2008): (21.83)
The year-to-date return as of the most recent calendar quarter, which ended June 30, 2018, was 0.76

<b>Average annual total returns (%)</b><br/>(for periods ended December 31, 2017)

Average Annual Total Returns - Western Asset High Yield Fund		1 year	5 years		10 years		Since inception	Inception date
Class I	[1]	7.09%	4.39%		6.59%
Class I | Return after taxes on distributions	[1]	4.71%	1.64%		3.33%
Class I | Return after taxes on distributions and sale of fund shares	[1]	3.99%	2.06%		3.63%
Class A	[1]	2.29%	3.34%			[2]	4.56%	Apr. 30, 2012
Class A2	[1]	2.22%		[2]		[2]	1.47%	Aug. 01, 2014
Class C	[1]	5.01%	3.31%			[2]	4.45%	Apr. 30, 2012
Class R	[1]	6.59%	3.80%			[2]	4.93%	Apr. 30, 2012
Class IS	[1]	7.26%	4.46%			[2]	7.54%	Aug. 04, 2008
Bloomberg Barclays U.S. Corporate High Yield—2% Issuer Cap Index (reflects no deduction for fees, expenses or taxes)	[1],[3]	7.50%	5.78%		8.09%

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.

[1] 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 “Sales charges” in the Prospectus.

[2] The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

[3] Maximum deferred sales charge (load) may be reduced over time.

[4] You may buy Class A or Class A2 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%.

[5] 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.

[1] “Other expenses” for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

[2] “Other expenses” for Class R shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements. For the fiscal year ended May 31, 2018, amounts recaptured totaled 0.02% for Class R shares and these amounts are excluded from “Other expenses”.

[3] Except for Class FI shares, total annual fund operating expenses do not correlate with the ratios of expenses to average net assets reported in the financial highlights tables in the fund’s Prospectus and in the fund’s shareholder reports, which reflect the fund’s operating expenses and 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, taxes, extraordinary expenses, deferred organizational expenses and acquired fund fees and expenses), so that the ratio of total annual fund operating expenses will not exceed 1.05% for Class A shares, 1.25% for Class A2 shares, 1.80% for Class C shares, 1.00% for Class FI shares, 1.30% for Class R shares and 0.65% 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, 2019 without the Board’s consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class within two 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.

[5] N/A

[6] Total annual fund operating expenses (after waiving fees and/or reimbursing expenses, as applicable) exceed the expense cap for Class FI, Class R, and Class IS shares as a result of acquired fund fees and expenses and interest expense.

[1] The total returns include gains from the settlement of securities litigation. Without these gains, total returns would have been lower.

[2] N/A

[3] For Class A, Class A2, Class C, Class R and Class IS shares, for the period from the class’ inception date to December 31, 2017, the average annual total return of the Bloomberg Barclays U.S. Corporate High Yield—2% Issuer Cap Index was 6.66%, 5.25%, 6.66%, 6.66% and 8.95%, respectively.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	WESTERN ASSET FUNDS INC
Prospectus Date	rr_ProspectusDate	Sep. 28, 2018
Western Asset High Yield Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	WESTERN ASSET<br/>HIGH YIELD FUND
Objective [Heading]	rr_ObjectiveHeading	<b>Investment objective</b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Maximize total return, consistent with prudent investment management.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses of the fund</b>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund. 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 Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your Service Agent, in the fund’s Prospectus on page 26 under the heading “Sales charges,” 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 83 under the heading “Sales Charge Waivers and Reductions for Class A or Class A2 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 LMIS 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	<b>Shareholder fees</b><br/>(fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual fund operating expenses (%)</b><br/>(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, 2019
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 most recent fiscal year, the fund’s portfolio turnover rate was 68% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	68.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	You may buy Class A or Class A2 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 Legg Mason Investor Services, LLC (“LMIS”), 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 FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	“Other expenses” for Class R shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees	Except for Class FI shares, total annual fund operating expenses do not correlate with the ratios of expenses to average net assets reported in the financial highlights tables in the fund’s Prospectus and in the fund’s shareholder reports, which reflect the fund’s operating expenses and do not include acquired fund fees and expenses.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example</b>
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 $10,000 in the fund for the time periods indicated Your investment has a 5% return each year and the fund’s operating expenses remain the same You reinvest all distributions and dividends without a sales charge Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	<b>Number of years you own your shares ($)</b>
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<b>Number of years you own your shares ($)</b>
Strategy [Heading]	rr_StrategyHeading	<b>Principal investment strategies</b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the fund will invest at least 80% of its net assets in U.S. dollar denominated debt or fixed income securities that are rated below investment grade at the time of purchase by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”) or are of a comparable quality as determined by the subadviser. The fund considers securities that are rated below the Baa or BBB categories to be rated below investment grade. Securities rated below investment grade are commonly known as “junk bonds” or “high yield securities.” In deciding among the securities in which the fund may invest, the subadviser takes into account the credit quality, country of issue, interest rate, liquidity, maturity and yield of a security as well as other factors, including the fund’s effective duration and prevailing and anticipated market conditions. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of particular features of a security (for example, some bonds can be prepaid by the issuer.) The fund is permitted to invest up to 20% of its total assets in non-U.S. dollar denominated non-U.S. securities. The fund may also enter into various exchange-traded and over-the-counter derivative transactions for both hedging and non-hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, bond and interest rate futures, options on bond and interest rate futures, futures, swaps, foreign currency futures, forwards and options. In particular, the fund may use interest rate swaps, credit default swaps (including buying and selling credit default swaps on individual securities and/or baskets of securities), options (including options on credit default swaps), and/or futures contracts to a significant extent, although the amounts invested in these instruments may change from time to time. Other instruments may also be used to a significant extent from time to time. The fund may use currency related transactions involving futures contracts (sometimes referred to as “futures”), options on futures contracts, indexed securities and other derivative instruments (collectively, “Financial Instruments”). These Financial Instruments may be used without limit, for either hedging purposes, or to implement a currency investment strategy.
Risk [Heading]	rr_RiskHeading	<b>Principal risks</b>
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 value 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, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. If the value of the securities owned by the fund falls, 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. Interest rates have been historically low, so the fund faces a heightened risk that interest rates may rise. 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. 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 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. Subordinated securities 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, tend to be less liquid and are more difficult to value than higher grade securities. 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, currencies, or the derivatives themselves behave in a way not anticipated by the fund. 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 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. 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. Credit default swap contracts involve heightened risks and may result in losses to the fund. Credit default swaps may be illiquid and difficult to value, and they increase credit risk since the fund has exposure to both the issuer whose credit is the subject of the swap and the counterparty to the swap. Leveraging 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. 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. Liquidity risk. Some assets held by the fund may be 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 recently 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, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of certain securities for an extended period (for example, several weeks or even longer). 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. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. 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 and political or financial instability. Lack of information may also affect the value of these securities. 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 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 fully developed and are less stable than those of more developed countries. Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by banks, agents and depositories that are less developed than those in the United States. 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. Currency risk. 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 conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls and speculation. 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 on prepaid 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. Risk of investing in fewer issuers. To the extent the fund invests its assets in a small number of issuers, the fund will be more susceptible to negative events affecting those issuers. 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. 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. Market events risk. In the past decade financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; declines in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks, have taken steps to support financial markets, including by keeping interest rates at historically low levels. This and other government intervention may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results. The Federal Reserve has reduced its market support activities and recently has begun raising interest rates. Certain foreign governments and central banks are implementing or discussing so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the fund invests. Policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation and may in some instances contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time. Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, 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 directly affected, the value and liquidity of the fund’s investments may be negatively affected. Hedging risk. There can be no assurance that the fund will engage in hedging transactions at any given time, even under volatile market conditions, or that any hedging transactions the fund engages in will be successful. Hedging transactions involve costs and may reduce gains or result in losses. Portfolio management risk. The value of your investment may decrease if the subadvisers’ judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect, or if there are imperfections, errors or limitations in the tools and data used by the subadvisers. 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 subadvisers 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 at a loss or depressed value, which could cause the value of your investment to decline. Cybersecurity risk. Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, customer data (including private shareholder information), or proprietary information, or cause the fund, the manager, the subadvisers 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. 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	<b>Performance</b>
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.leggmason.com/mutualfunds (select fund and share class), or by calling the fund at 1-877-721-1926. 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]	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	1-877-721-1926
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.leggmason.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	<b>Total returns</b> (%)<br/>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 (06/30/2009): 24.12    Worst Quarter (12/31/2008): (21.83) The year-to-date return as of the most recent calendar quarter, which ended June 30, 2018, was 0.76
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns (%)</b><br/>(for periods ended December 31, 2017)
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.
Western Asset High Yield Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.25%	[1],[2]
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none	[3],[4]
Small account fee ($)	rr_MaximumAccountFee	$ 15	[5]
Management fees	rr_ManagementFeesOverAssets	0.55%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.21%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.01%	[6]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[7]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.01%	[8]
1 year	rr_ExpenseExampleYear01	$ 524
3 years	rr_ExpenseExampleYear03	734
5 years	rr_ExpenseExampleYear05	960
10 years	rr_ExpenseExampleYear10	1,610
1 year	rr_ExpenseExampleNoRedemptionYear01	524
3 years	rr_ExpenseExampleNoRedemptionYear03	734
5 years	rr_ExpenseExampleNoRedemptionYear05	960
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,610
1 year	rr_AverageAnnualReturnYear01	2.29%	[9]
5 years	rr_AverageAnnualReturnYear05	3.34%	[9]
10 years	rr_AverageAnnualReturnYear10		[9],[10]
Since inception	rr_AverageAnnualReturnSinceInception	4.56%	[9]
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2012	[9]
Western Asset High Yield Fund | Class A2
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.25%
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none	[3],[4]
Small account fee ($)	rr_MaximumAccountFee	$ 15	[5]
Management fees	rr_ManagementFeesOverAssets	0.55%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.19%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.99%	[6]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[7]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.99%	[8]
1 year	rr_ExpenseExampleYear01	$ 522
3 years	rr_ExpenseExampleYear03	728
5 years	rr_ExpenseExampleYear05	950
10 years	rr_ExpenseExampleYear10	1,587
1 year	rr_ExpenseExampleNoRedemptionYear01	522
3 years	rr_ExpenseExampleNoRedemptionYear03	728
5 years	rr_ExpenseExampleNoRedemptionYear05	950
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,587
1 year	rr_AverageAnnualReturnYear01	2.22%	[9]
5 years	rr_AverageAnnualReturnYear05		[9],[10]
10 years	rr_AverageAnnualReturnYear10		[9],[10]
Since inception	rr_AverageAnnualReturnSinceInception	1.47%	[9]
Inception date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2014	[9]
Western Asset 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%	[3]
Small account fee ($)	rr_MaximumAccountFee	$ 15	[5]
Management fees	rr_ManagementFeesOverAssets	0.55%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.21%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.76%	[6]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[7]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.76%	[8]
1 year	rr_ExpenseExampleYear01	$ 279
3 years	rr_ExpenseExampleYear03	555
5 years	rr_ExpenseExampleYear05	955
10 years	rr_ExpenseExampleYear10	2,075
1 year	rr_ExpenseExampleNoRedemptionYear01	179
3 years	rr_ExpenseExampleNoRedemptionYear03	555
5 years	rr_ExpenseExampleNoRedemptionYear05	955
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 2,075
1 year	rr_AverageAnnualReturnYear01	5.01%	[9]
5 years	rr_AverageAnnualReturnYear05	3.31%	[9]
10 years	rr_AverageAnnualReturnYear10		[9],[10]
Since inception	rr_AverageAnnualReturnSinceInception	4.45%	[9]
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2012	[9]
Western Asset High Yield Fund | Class FI
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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.55%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.33%	[11]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.13%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)	[7]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.02%	[8]
1 year	rr_ExpenseExampleYear01	$ 104
3 years	rr_ExpenseExampleYear03	348
5 years	rr_ExpenseExampleYear05	611
10 years	rr_ExpenseExampleYear10	1,363
1 year	rr_ExpenseExampleNoRedemptionYear01	104
3 years	rr_ExpenseExampleNoRedemptionYear03	348
5 years	rr_ExpenseExampleNoRedemptionYear05	611
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,363
Western Asset 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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.55%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.44%	[12]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.49%	[6]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.17%)	[7]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.32%	[8]
1 year	rr_ExpenseExampleYear01	$ 134
3 years	rr_ExpenseExampleYear03	454
5 years	rr_ExpenseExampleYear05	796
10 years	rr_ExpenseExampleYear10	1,763
1 year	rr_ExpenseExampleNoRedemptionYear01	134
3 years	rr_ExpenseExampleNoRedemptionYear03	454
5 years	rr_ExpenseExampleNoRedemptionYear05	796
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,763
1 year	rr_AverageAnnualReturnYear01	6.59%	[9]
5 years	rr_AverageAnnualReturnYear05	3.80%	[9]
10 years	rr_AverageAnnualReturnYear10		[9],[10]
Since inception	rr_AverageAnnualReturnSinceInception	4.93%	[9]
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2012	[9]
Western Asset 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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.55%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.20%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.75%	[6]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[10]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.75%	[8]
1 year	rr_ExpenseExampleYear01	$ 77
3 years	rr_ExpenseExampleYear03	240
5 years	rr_ExpenseExampleYear05	417
10 years	rr_ExpenseExampleYear10	930
1 year	rr_ExpenseExampleNoRedemptionYear01	77
3 years	rr_ExpenseExampleNoRedemptionYear03	240
5 years	rr_ExpenseExampleNoRedemptionYear05	417
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 930
2008	rr_AnnualReturn2008	(30.12%)
2009	rr_AnnualReturn2009	56.73%
2010	rr_AnnualReturn2010	16.24%
2011	rr_AnnualReturn2011	1.87%
2012	rr_AnnualReturn2012	17.76%
2013	rr_AnnualReturn2013	7.64%
2014	rr_AnnualReturn2014	(0.11%)
2015	rr_AnnualReturn2015	(7.19%)
2016	rr_AnnualReturn2016	15.98%
2017	rr_AnnualReturn2017	7.09%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	0.76%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<b>Best Quarter</b>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	24.12%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<b>Worst Quarter</b>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(21.83%)
1 year	rr_AverageAnnualReturnYear01	7.09%	[9]
5 years	rr_AverageAnnualReturnYear05	4.39%	[9]
10 years	rr_AverageAnnualReturnYear10	6.59%	[9]
Western Asset 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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.55%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.14%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.69%	[6]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[7]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.67%	[8]
1 year	rr_ExpenseExampleYear01	$ 68
3 years	rr_ExpenseExampleYear03	219
5 years	rr_ExpenseExampleYear05	382
10 years	rr_ExpenseExampleYear10	857
1 year	rr_ExpenseExampleNoRedemptionYear01	68
3 years	rr_ExpenseExampleNoRedemptionYear03	219
5 years	rr_ExpenseExampleNoRedemptionYear05	382
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 857
1 year	rr_AverageAnnualReturnYear01	7.26%	[9]
5 years	rr_AverageAnnualReturnYear05	4.46%	[9]
10 years	rr_AverageAnnualReturnYear10		[9],[10]
Since inception	rr_AverageAnnualReturnSinceInception	7.54%	[9]
Inception date	rr_AverageAnnualReturnInceptionDate	Aug. 04, 2008	[9]
Western Asset High Yield Fund | Return after taxes on distributions | Class I
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	4.71%	[9]
5 years	rr_AverageAnnualReturnYear05	1.64%	[9]
10 years	rr_AverageAnnualReturnYear10	3.33%	[9]
Western Asset High Yield Fund | Return after taxes on distributions and sale of fund shares | Class I
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.99%	[9]
5 years	rr_AverageAnnualReturnYear05	2.06%	[9]
10 years	rr_AverageAnnualReturnYear10	3.63%	[9]
Western Asset High Yield Fund | Bloomberg Barclays U.S. Corporate High Yield—2% Issuer Cap Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	7.50%	[9],[13]
5 years	rr_AverageAnnualReturnYear05	5.78%	[9],[13]
10 years	rr_AverageAnnualReturnYear10	8.09%	[9],[13]

[1] 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 “Sales charges” in the Prospectus.

[2] The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

[3] Maximum deferred sales charge (load) may be reduced over time.

[4] You may buy Class A or Class A2 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%.

[5] 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.

[6] Except for Class FI shares, total annual fund operating expenses do not correlate with the ratios of expenses to average net assets reported in the financial highlights tables in the fund’s Prospectus and in the fund’s shareholder reports, which reflect the fund’s operating expenses and do not include acquired fund fees and expenses.

[7] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage commissions, taxes, extraordinary expenses, deferred organizational expenses and acquired fund fees and expenses), so that the ratio of total annual fund operating expenses will not exceed 1.05% for Class A shares, 1.25% for Class A2 shares, 1.80% for Class C shares, 1.00% for Class FI shares, 1.30% for Class R shares and 0.65% 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, 2019 without the Board’s consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class within two 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.

[8] Total annual fund operating expenses (after waiving fees and/or reimbursing expenses, as applicable) exceed the expense cap for Class FI, Class R, and Class IS shares as a result of acquired fund fees and expenses and interest expense.

[9] The total returns include gains from the settlement of securities litigation. Without these gains, total returns would have been lower.

[10] N/A

[11] “Other expenses” for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

[12] “Other expenses” for Class R shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements. For the fiscal year ended May 31, 2018, amounts recaptured totaled 0.02% for Class R shares and these amounts are excluded from “Other expenses”.

[13] For Class A, Class A2, Class C, Class R and Class IS shares, for the period from the class’ inception date to December 31, 2017, the average annual total return of the Bloomberg Barclays U.S. Corporate High Yield—2% Issuer Cap Index was 6.66%, 5.25%, 6.66%, 6.66% and 8.95%, respectively.

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Western Asset Intermediate Bond Fund

WESTERN ASSET <br/>INTERMEDIATE BOND FUND

<b>Investment objective </b>

Maximize total return, consistent with prudent investment management and liquidity needs, by investing to obtain the average duration specified below.

<b>Fees and expenses of the fund </b>

The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

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 Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your Service Agent, in the fund’s Prospectus on page 26 under the heading “Sales charges,” 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 83 under the heading “Sales Charge Waivers and Reductions for Class A or Class A2 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 LMIS 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.

<b>Shareholder fees</b><br/>(fees paid directly from your investment)

Shareholder Fees - Western Asset Intermediate Bond Fund - USD ($)		Class A		Class C	Class FI	Class R	Class I	Class IS
Maximum sales charge (load) imposed on purchases (as a % of offering price)		4.25%	[1],[2]	none	none	none	none	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	[3]	none	[4]	1.00%	none	none	none	none
Small account fee ($)	[5]	$ 15		$ 15	none	none	none	none

<b>Annual fund operating expenses (%)</b><br/>(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Western Asset Intermediate Bond Fund	Class A		Class C		Class FI		Class R		Class I		Class IS
Management fees	0.40%		0.40%		0.40%		0.40%		0.40%		0.40%
Distribution and/or service (12b-1) fees	0.25%		1.00%		0.25%		0.50%		none		none
Other expenses	0.22%		0.18%		0.25%	[1]	0.32%	[2]	0.12%		0.05%
Total annual fund operating expenses	0.87%		1.58%		0.90%		1.22%		0.52%		0.45%
Fees waived and/or expenses reimbursed		[3]		[3]	(0.05%)	[3]	(0.07%)	[3]		[4]		[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	0.87%		1.58%		0.85%		1.15%		0.52%		0.45%

<b>Example </b>

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

• 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:

<b>Number of years you own your shares ($)</b>

Expense Example - Western Asset Intermediate Bond Fund - USD ($)	1 year	3 years	5 years	10 years
Class A	510	691	887	1,452
Class C	261	499	861	1,879
Class FI	87	283	495	1,105
Class R	117	380	663	1,470
Class I	53	167	291	652
Class IS	46	144	252	567

<b>Number of years you own your shares ($)</b>

Expense Example, No Redemption - Western Asset Intermediate Bond Fund - USD ($)	1 year	3 years	5 years	10 years
Class A	510	691	887	1,452
Class C	161	499	861	1,879
Class FI	87	283	495	1,105
Class R	117	380	663	1,470
Class I	53	167	291	652
Class IS	46	144	252	567

Portfolio turnover.

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 84% of the average value of its portfolio.

<b>Principal investment strategies </b>

The fund invests in a portfolio of fixed income securities of various maturities and, under normal market conditions, will invest at least 80% of its net assets in debt and fixed income securities. Although the fund may invest in debt and fixed income securities of any maturity, under normal market conditions the target dollar-weighted average effective duration for the fund, as estimated by the fund’s subadviser, is expected to range within 20% of the duration of its benchmark, the Bloomberg Barclays Intermediate U.S. Government/Credit Index. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of particular features of a security (for example, some bonds can be prepaid by the issuer).

The fund presently intends to limit its investments to U.S. dollar denominated securities and currently anticipates that it will only purchase debt securities that are rated in the Baa or BBB categories or above at the time of purchase by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”) or unrated securities of comparable quality at the time of purchase (as determined by the subadviser). These securities are known as “investment grade securities.” The fund may invest up to 25% of its total assets in the securities of non-U.S. issuers. The fund intends to invest a substantial portion of its assets in mortgage-backed and asset-backed securities.

The fund may also enter into various exchange-traded and over-the-counter derivative transactions for both hedging and non-hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, bond and interest rate futures, options on bonds and swaps, options on bond and interest rate futures, futures, options and swaps.

In particular, the fund may use interest rate swaps, credit default swaps (including buying and selling credit default swaps on individual securities and/or baskets of securities), options (including options on credit default swaps), and/or futures contracts (including options on futures contracts) to a significant extent, although the amounts invested in these instruments may change from time to time. Other instruments may also be used to a significant extent from time to time.

<b>Principal risks </b>

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 value 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, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. If the value of the securities owned by the fund falls, 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. Interest rates have been historically low, so the fund faces a heightened risk that interest rates may rise. 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.

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 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.

Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains when market prices, interest rates, currencies, or the derivatives themselves behave in a way not anticipated by the fund. 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 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. 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.

Credit default swap contracts involve heightened risks and may result in losses to the fund. Credit default swaps may be illiquid and difficult to value, and they increase credit risk since the fund has exposure to both the issuer whose credit is the subject of the swap and the counterparty to the swap.

Leveraging 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. 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.

Liquidity risk. Some assets held by the fund may be 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 recently 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, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of certain securities for an extended period (for example, several weeks or even longer).

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. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. 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 and political or financial instability. Lack of information may also affect the value of these securities. 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 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 fully developed and are less stable than those of more developed countries. Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by banks, agents and depositories that are less developed than those in the United States. 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.

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 on prepaid 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.

Risk of investing in fewer issuers. To the extent the fund invests its assets in a small number of issuers, the fund will be more susceptible to negative events affecting those issuers.

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. 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.

Market events risk. In the past decade financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; declines in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment.

The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks, have taken steps to support financial markets, including by keeping interest rates at historically low levels. This and other government intervention may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results. The Federal Reserve has reduced its market support activities and recently has begun raising interest rates. Certain foreign governments and central banks are implementing or discussing so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the fund invests.

Policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation and may in some instances contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, 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 directly affected, the value and liquidity of the fund’s investments may be negatively affected.

Hedging risk. There can be no assurance that the fund will engage in hedging transactions at any given time, even under volatile market conditions, or that any hedging transactions the fund engages in will be successful. Hedging transactions involve costs and may reduce gains or result in losses.

Mortgage-backed and asset-backed securities risk. When market interest rates increase, the market values of mortgage-backed securities decline. At the same time, however, 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.

Portfolio management risk. The value of your investment may decrease if the subadvisers’ judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect, or if there are imperfections, errors or limitations in the tools and data used by the subadvisers. 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 subadvisers 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 at a loss or depressed value, which could cause the value of your investment to decline.

Cybersecurity risk. Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, customer data (including private shareholder information), or proprietary information, or cause the fund, the manager, the subadvisers 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.

These and other risks are discussed in more detail in the Prospectus or in the Statement of Additional Information.

<b>Performance </b>

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.leggmason.com/mutualfunds (select fund and share class), or by calling the fund at 1-877-721-1926.

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.

<b>Total returns</b> (%)<br/>Before taxes

Calendar Years ended December 31

Best Quarter (06/30/2009): 8.42    Worst Quarter (09/30/2008): (4.09)
The year-to-date return as of the most recent calendar quarter, which ended June 30, 2018, was (1.20)

<b>Average annual total returns (%)</b><br/>(for periods ended December 31, 2017)

Average Annual Total Returns - Western Asset Intermediate Bond Fund		1 year	5 years	10 years		Since inception	Inception date
Class I		4.02%	2.34%	4.42%
Class I | Return after taxes on distributions		2.96%	1.15%	2.99%
Class I | Return after taxes on distributions and sale of fund shares		2.28%	1.27%	2.88%
Class A		(0.87%)	1.06%		[1]	1.60%	Apr. 30, 2012
Class C		1.99%	1.23%		[1]	1.67%	Apr. 30, 2012
Class R		3.34%	1.67%		[1]	2.12%	Apr. 30, 2012
Class IS		4.16%	2.41%		[1]	5.34%	Oct. 03, 2008
Bloomberg Barclays Intermediate U.S. Government Credit Index (reflects no deduction for fees, expenses or taxes)	[2]	2.14%	1.50%	3.32%

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.

[1] 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 “Sales charges” in the Prospectus.

[2] The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

[3] Maximum deferred sales charge (load) may be reduced over time.

[4] 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%.

[5] 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.

[1] “Other expenses” for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

[2] “Other expenses” for Class R shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements. For the fiscal year ended May 31, 2018, amounts recaptured totaled 0.01% for Class R shares and this amount is excluded from “Other expenses.”

[3] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage commissions, taxes, extraordinary expenses, deferred organizational expenses and acquired fund fees and expenses), so that the ratio of total annual fund operating expenses will not exceed 0.90% for Class A shares, 1.65% for Class C shares, 0.85% for Class FI shares, 1.15% for Class R shares and 0.45% 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, 2019 without the Board’s consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class within two 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.

[4] N/A

[1] N/A

[2] For Class A, Class C, Class R and Class IS shares, for the period from the class’ inception date to December 31, 2017, the average annual total return of the Bloomberg Barclays Intermediate U.S. Government Credit Index was 1.73%, 1.73%, 1.73% and 3.50%, respectively.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	WESTERN ASSET FUNDS INC
Prospectus Date	rr_ProspectusDate	Sep. 28, 2018
Western Asset Intermediate Bond Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	WESTERN ASSET <br/>INTERMEDIATE BOND FUND
Objective [Heading]	rr_ObjectiveHeading	<b>Investment objective </b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Maximize total return, consistent with prudent investment management and liquidity needs, by investing to obtain the average duration specified below.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses of the fund </b>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund. 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 Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor. More information about these and other discounts is available from your Service Agent, in the fund’s Prospectus on page 26 under the heading “Sales charges,” 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 83 under the heading “Sales Charge Waivers and Reductions for Class A or Class A2 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 LMIS 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	<b>Shareholder fees</b><br/>(fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual fund operating expenses (%)</b><br/>(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, 2019
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 most recent fiscal year, the fund’s portfolio turnover rate was 84% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	84.00%
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 Legg Mason Investor Services, LLC (“LMIS”), 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 FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	“Other expenses” for Class R shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example </b>
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 $10,000 in the fund for the time periods indicated Your investment has a 5% return each year and the fund’s operating expenses remain the same You reinvest all distributions and dividends without a sales charge Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	<b>Number of years you own your shares ($)</b>
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<b>Number of years you own your shares ($)</b>
Strategy [Heading]	rr_StrategyHeading	<b>Principal investment strategies </b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The fund invests in a portfolio of fixed income securities of various maturities and, under normal market conditions, will invest at least 80% of its net assets in debt and fixed income securities. Although the fund may invest in debt and fixed income securities of any maturity, under normal market conditions the target dollar-weighted average effective duration for the fund, as estimated by the fund’s subadviser, is expected to range within 20% of the duration of its benchmark, the Bloomberg Barclays Intermediate U.S. Government/Credit Index. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of particular features of a security (for example, some bonds can be prepaid by the issuer). The fund presently intends to limit its investments to U.S. dollar denominated securities and currently anticipates that it will only purchase debt securities that are rated in the Baa or BBB categories or above at the time of purchase by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”) or unrated securities of comparable quality at the time of purchase (as determined by the subadviser). These securities are known as “investment grade securities.” The fund may invest up to 25% of its total assets in the securities of non-U.S. issuers. The fund intends to invest a substantial portion of its assets in mortgage-backed and asset-backed securities. The fund may also enter into various exchange-traded and over-the-counter derivative transactions for both hedging and non-hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, bond and interest rate futures, options on bonds and swaps, options on bond and interest rate futures, futures, options and swaps. In particular, the fund may use interest rate swaps, credit default swaps (including buying and selling credit default swaps on individual securities and/or baskets of securities), options (including options on credit default swaps), and/or futures contracts (including options on futures contracts) to a significant extent, although the amounts invested in these instruments may change from time to time. Other instruments may also be used to a significant extent from time to time.
Risk [Heading]	rr_RiskHeading	<b>Principal risks </b>
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 value 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, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. If the value of the securities owned by the fund falls, 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. Interest rates have been historically low, so the fund faces a heightened risk that interest rates may rise. 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. 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 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. Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains when market prices, interest rates, currencies, or the derivatives themselves behave in a way not anticipated by the fund. 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 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. 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. Credit default swap contracts involve heightened risks and may result in losses to the fund. Credit default swaps may be illiquid and difficult to value, and they increase credit risk since the fund has exposure to both the issuer whose credit is the subject of the swap and the counterparty to the swap. Leveraging 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. 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. Liquidity risk. Some assets held by the fund may be 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 recently 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, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of certain securities for an extended period (for example, several weeks or even longer). 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. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. 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 and political or financial instability. Lack of information may also affect the value of these securities. 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 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 fully developed and are less stable than those of more developed countries. Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by banks, agents and depositories that are less developed than those in the United States. 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. 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 on prepaid 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. Risk of investing in fewer issuers. To the extent the fund invests its assets in a small number of issuers, the fund will be more susceptible to negative events affecting those issuers. 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. 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. Market events risk. In the past decade financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; declines in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks, have taken steps to support financial markets, including by keeping interest rates at historically low levels. This and other government intervention may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results. The Federal Reserve has reduced its market support activities and recently has begun raising interest rates. Certain foreign governments and central banks are implementing or discussing so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the fund invests. Policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation and may in some instances contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time. Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, 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 directly affected, the value and liquidity of the fund’s investments may be negatively affected. Hedging risk. There can be no assurance that the fund will engage in hedging transactions at any given time, even under volatile market conditions, or that any hedging transactions the fund engages in will be successful. Hedging transactions involve costs and may reduce gains or result in losses. Mortgage-backed and asset-backed securities risk. When market interest rates increase, the market values of mortgage-backed securities decline. At the same time, however, 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. Portfolio management risk. The value of your investment may decrease if the subadvisers’ judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect, or if there are imperfections, errors or limitations in the tools and data used by the subadvisers. 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 subadvisers 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 at a loss or depressed value, which could cause the value of your investment to decline. Cybersecurity risk. Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, customer data (including private shareholder information), or proprietary information, or cause the fund, the manager, the subadvisers 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. 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	<b>Performance </b>
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.leggmason.com/mutualfunds (select fund and share class), or by calling the fund at 1-877-721-1926. 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]	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	1-877-721-1926
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.leggmason.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	<b>Total returns</b> (%)<br/>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 (06/30/2009): 8.42    Worst Quarter (09/30/2008): (4.09) The year-to-date return as of the most recent calendar quarter, which ended June 30, 2018, was (1.20)
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns (%)</b><br/>(for periods ended December 31, 2017)
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.
Western Asset Intermediate Bond Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.25%	[1],[2]
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none	[3],[4]
Small account fee ($)	rr_MaximumAccountFee	$ 15	[5]
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.22%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.87%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[6]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.87%
1 year	rr_ExpenseExampleYear01	$ 510
3 years	rr_ExpenseExampleYear03	691
5 years	rr_ExpenseExampleYear05	887
10 years	rr_ExpenseExampleYear10	1,452
1 year	rr_ExpenseExampleNoRedemptionYear01	510
3 years	rr_ExpenseExampleNoRedemptionYear03	691
5 years	rr_ExpenseExampleNoRedemptionYear05	887
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,452
1 year	rr_AverageAnnualReturnYear01	(0.87%)
5 years	rr_AverageAnnualReturnYear05	1.06%
10 years	rr_AverageAnnualReturnYear10		[7]
Since inception	rr_AverageAnnualReturnSinceInception	1.60%
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2012
Western Asset Intermediate Bond 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%	[3]
Small account fee ($)	rr_MaximumAccountFee	$ 15	[5]
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.18%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.58%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[6]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.58%
1 year	rr_ExpenseExampleYear01	$ 261
3 years	rr_ExpenseExampleYear03	499
5 years	rr_ExpenseExampleYear05	861
10 years	rr_ExpenseExampleYear10	1,879
1 year	rr_ExpenseExampleNoRedemptionYear01	161
3 years	rr_ExpenseExampleNoRedemptionYear03	499
5 years	rr_ExpenseExampleNoRedemptionYear05	861
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,879
1 year	rr_AverageAnnualReturnYear01	1.99%
5 years	rr_AverageAnnualReturnYear05	1.23%
10 years	rr_AverageAnnualReturnYear10		[7]
Since inception	rr_AverageAnnualReturnSinceInception	1.67%
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2012
Western Asset Intermediate Bond Fund | Class FI
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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.25%	[8]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.90%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.05%)	[6]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.85%
1 year	rr_ExpenseExampleYear01	$ 87
3 years	rr_ExpenseExampleYear03	283
5 years	rr_ExpenseExampleYear05	495
10 years	rr_ExpenseExampleYear10	1,105
1 year	rr_ExpenseExampleNoRedemptionYear01	87
3 years	rr_ExpenseExampleNoRedemptionYear03	283
5 years	rr_ExpenseExampleNoRedemptionYear05	495
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,105
Western Asset Intermediate Bond 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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.32%	[9]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.22%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.07%)	[6]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.15%
1 year	rr_ExpenseExampleYear01	$ 117
3 years	rr_ExpenseExampleYear03	380
5 years	rr_ExpenseExampleYear05	663
10 years	rr_ExpenseExampleYear10	1,470
1 year	rr_ExpenseExampleNoRedemptionYear01	117
3 years	rr_ExpenseExampleNoRedemptionYear03	380
5 years	rr_ExpenseExampleNoRedemptionYear05	663
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,470
1 year	rr_AverageAnnualReturnYear01	3.34%
5 years	rr_AverageAnnualReturnYear05	1.67%
10 years	rr_AverageAnnualReturnYear10		[7]
Since inception	rr_AverageAnnualReturnSinceInception	2.12%
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2012
Western Asset Intermediate Bond 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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.12%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.52%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[7]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.52%
1 year	rr_ExpenseExampleYear01	$ 53
3 years	rr_ExpenseExampleYear03	167
5 years	rr_ExpenseExampleYear05	291
10 years	rr_ExpenseExampleYear10	652
1 year	rr_ExpenseExampleNoRedemptionYear01	53
3 years	rr_ExpenseExampleNoRedemptionYear03	167
5 years	rr_ExpenseExampleNoRedemptionYear05	291
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 652
2008	rr_AnnualReturn2008	(4.62%)
2009	rr_AnnualReturn2009	17.24%
2010	rr_AnnualReturn2010	8.76%
2011	rr_AnnualReturn2011	5.35%
2012	rr_AnnualReturn2012	7.10%
2013	rr_AnnualReturn2013	(0.78%)
2014	rr_AnnualReturn2014	3.89%
2015	rr_AnnualReturn2015	1.49%
2016	rr_AnnualReturn2016	3.16%
2017	rr_AnnualReturn2017	4.02%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(1.20%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<b>Best Quarter</b>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	8.42%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<b>Worst Quarter</b>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.09%)
1 year	rr_AverageAnnualReturnYear01	4.02%
5 years	rr_AverageAnnualReturnYear05	2.34%
10 years	rr_AverageAnnualReturnYear10	4.42%
Western Asset Intermediate Bond 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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.45%
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[6]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.45%
1 year	rr_ExpenseExampleYear01	$ 46
3 years	rr_ExpenseExampleYear03	144
5 years	rr_ExpenseExampleYear05	252
10 years	rr_ExpenseExampleYear10	567
1 year	rr_ExpenseExampleNoRedemptionYear01	46
3 years	rr_ExpenseExampleNoRedemptionYear03	144
5 years	rr_ExpenseExampleNoRedemptionYear05	252
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 567
1 year	rr_AverageAnnualReturnYear01	4.16%
5 years	rr_AverageAnnualReturnYear05	2.41%
10 years	rr_AverageAnnualReturnYear10		[7]
Since inception	rr_AverageAnnualReturnSinceInception	5.34%
Inception date	rr_AverageAnnualReturnInceptionDate	Oct. 03, 2008
Western Asset Intermediate Bond Fund | Return after taxes on distributions | Class I
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	2.96%
5 years	rr_AverageAnnualReturnYear05	1.15%
10 years	rr_AverageAnnualReturnYear10	2.99%
Western Asset Intermediate Bond Fund | Return after taxes on distributions and sale of fund shares | Class I
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	2.28%
5 years	rr_AverageAnnualReturnYear05	1.27%
10 years	rr_AverageAnnualReturnYear10	2.88%
Western Asset Intermediate Bond Fund | Bloomberg Barclays Intermediate U.S. Government Credit Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	2.14%	[10]
5 years	rr_AverageAnnualReturnYear05	1.50%	[10]
10 years	rr_AverageAnnualReturnYear10	3.32%	[10]

[1] 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 “Sales charges” in the Prospectus.

[2] The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

[3] Maximum deferred sales charge (load) may be reduced over time.

[4] 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%.

[5] 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.

[6] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage commissions, taxes, extraordinary expenses, deferred organizational expenses and acquired fund fees and expenses), so that the ratio of total annual fund operating expenses will not exceed 0.90% for Class A shares, 1.65% for Class C shares, 0.85% for Class FI shares, 1.15% for Class R shares and 0.45% 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, 2019 without the Board’s consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class within two 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.

[7] N/A

[8] “Other expenses” for Class FI shares are estimated for the current fiscal year. Actual expenses may differ from estimates.

[9] “Other expenses” for Class R shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements. For the fiscal year ended May 31, 2018, amounts recaptured totaled 0.01% for Class R shares and this amount is excluded from “Other expenses.”

[10] For Class A, Class C, Class R and Class IS shares, for the period from the class’ inception date to December 31, 2017, the average annual total return of the Bloomberg Barclays Intermediate U.S. Government Credit Index was 1.73%, 1.73%, 1.73% and 3.50%, respectively.

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Western Asset Total Return Unconstrained Fund

WESTERN ASSET <br/>TOTAL RETURN<br/>UNCONSTRAINED FUND

<b>Investment objective </b>

Maximize long-term total return.

<b>Fees and expenses of the fund </b>

The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

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 Legg Mason Investor Services, LLC (“LMIS”), 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 “Sales charges,” 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 83 under the heading “Sales Charge Waivers and Reductions for Class A or Class A2 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 LMIS 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.

<b>Shareholder fees</b><br/>(fees paid directly from your investment)

Shareholder Fees - Western Asset Total Return Unconstrained Fund - USD ($)		Class A		Class A2		Class C	Class FI	Class R	Class I	Class IS
Maximum sales charge (load) imposed on purchases (as a % of offering price)		4.25%	[1],[2]	4.25%		none	none	none	none	none
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	[3]	none	[4]	none	[4]	1.00%	none	none	none	none
Small account fee ($)	[5]	$ 15		$ 15		$ 15	none	none	none	none

<b>Annual fund operating expenses (%)</b><br/>(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Western Asset Total Return Unconstrained Fund		Class A		Class A2		Class C		Class FI		Class R		Class I		Class IS
Management fees		0.60%		0.60%		0.60%		0.60%		0.60%		0.60%		0.60%
Distribution and/or service (12b-1) fees		0.25%		0.25%		1.00%		0.25%		0.50%		none		none
Other expenses		0.33%	[1]	0.30%	[1]	0.15%	[1]	0.16%	[1]	0.21%	[1]	0.15%	[1]	0.06%
Total annual fund operating expenses	[2]	1.18%		1.15%		1.75%		1.01%		1.31%		0.75%		0.66%
Fees waived and/or expenses reimbursed	[3]	(0.08%)												(0.01%)
Total annual fund operating expenses after waiving fees and/or reimbursing expenses		1.10%		1.15%		1.75%		1.01%		1.31%		0.75%		0.65%

<b>Example </b>

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

• 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:

<b>Number of years you own your shares ($)</b>

Expense Example - Western Asset Total Return Unconstrained Fund - USD ($)	1 year	3 years	5 years	10 years
Class A	532	776	1,039	1,789
Class A2	537	775	1,032	1,765
Class C	278	552	950	2,063
Class FI	103	321	557	1,234
Class R	133	414	717	1,578
Class I	77	240	417	930
Class IS	66	209	366	821

<b>Number of years you own your shares ($)</b>

Expense Example, No Redemption - Western Asset Total Return Unconstrained Fund - USD ($)	1 year	3 years	5 years	10 years
Class A	532	776	1,039	1,789
Class A2	537	775	1,032	1,765
Class C	178	552	950	2,063
Class FI	103	321	557	1,234
Class R	133	414	717	1,578
Class I	77	240	417	930
Class IS	66	209	366	821

Portfolio turnover.

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 49% of the average value of its portfolio.

<b>Principal investment strategies </b>

The fund has a flexible investment strategy and will invest in a variety of securities and instruments and use a variety of investment techniques in pursuing its objective. Under normal market conditions, the fund will invest at least 50% of its net assets in debt and fixed income securities rated at least in the Baa or BBB categories at the time of purchase by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”) or unrated securities of comparable quality at the time of purchase (as determined by the subadvisers). These securities are known as “investment grade securities.” The fund intends to invest a substantial portion of its assets in mortgage-backed and asset-backed securities.

The fund may also enter into various exchange-traded and over-the-counter derivative transactions for both hedging and non-hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, bond and interest rate futures, options on bonds, options on bond and interest rate futures, swaps, foreign currency futures, forwards and options, options on swaps, options on forwards and commodity and commodity index futures, options, swaps and structured notes.

In particular, the fund may use certain derivatives, including interest rate swaps, credit default swaps (including buying and selling credit default swaps on individual securities and/or baskets of securities), options (including options on credit default swaps), and/or futures contracts (including options on futures contracts) to a significant extent, although the amounts invested in these instruments may change from time to time. Other derivative instruments may also be used to a significant extent from time to time.

The fund may use currency related transactions involving options and futures contracts (sometimes referred to as “futures”), indexed securities and other derivative instruments (collectively, “Financial Instruments”). These Financial Instruments may be used without limit, for either hedging purposes, or to implement a currency investment strategy.

The subadvisers use fundamental investment techniques to select issues. In deciding among the securities and instruments in which the fund may invest, the subadvisers may take into account the credit quality, country of issue, interest rate, liquidity, maturity and yield of a security or instrument as well as other factors, including the fund’s dollar-weighted average effective duration and prevailing or anticipated market conditions. Although the fund may invest in securities of any maturity, the fund will normally maintain a dollar-weighted average effective duration (including futures positions), as estimated by the fund’s subadvisers, within the range of -3 to 8 years. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of structural complexities (for example, some bonds can be prepaid by the issuer). Although the fund may invest in debt and fixed income securities of any credit quality, including securities that are in default, under normal market conditions it is expected that the fund will maintain a dollar-weighted average credit quality of portfolio holdings of at least the Baa/BBB categories or their equivalent (as determined by the subadvisers).

In addition, under normal market conditions, at the time of purchase:

• No more than 50% of the fund’s net assets may be invested in non-U.S. dollar denominated securities.

• No more than 25% of the fund’s net assets may be invested in un-hedged non-U.S. dollar denominated securities.

• No more than 25% of the fund’s net assets may be invested in non-U.S. dollar denominated securities that are not investment grade securities. Securities rated below investment grade are commonly known as “junk bonds” or “high yield securities.”

• No more than 25% of the fund’s net assets may be invested in securities of non-U.S. issuers that are not investment grade securities.

• No more than 50% of the fund’s net assets may be invested in a combination of non-U.S. dollar denominated securities, emerging market securities and securities that are not investment grade securities.

• The fund is permitted to invest in securities issued or guaranteed by the government of the United States or any of the G-7 countries, including their agencies, instrumentalities and political sub-divisions, without limit; however, (i) no more than 10% of the fund’s net assets may be invested in securities issued or guaranteed by a single government that is a non-G-7 country, including its agencies, instrumentalities and sub-divisions; (ii) no more than 10% of the fund’s net assets may be invested in private mortgage-backed and asset-backed securities of a single issuer unless the collateral relating to such securities is credit-independent of the issuer and the security’s credit enhancement is independent of the issuer, in which case no more than 25% of the fund’s net assets may be invested in private mortgage-backed and asset-backed securities of such issuer; and (iii) other than as described above, no more than 5% of the fund’s net assets may be invested in the obligations of any single issuer.

• The aggregate initial futures margin and options premiums required to establish commodity interest positions will not exceed 5% of the net assets of the fund, after taking into account unrealized profits and unrealized losses on any such positions; provided, however, that if an option is in-the-money at the time of purchase, the amount by which the option is in-the-money may be excluded in computing such 5%.

<b>Principal risks </b>

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.

The fund’s investment strategies and portfolio investments differ from those of many other mutual funds. This approach to investing may make the fund a more volatile investment than other mutual funds and cause the fund to perform less favorably than other mutual funds under similar market or economic conditions. 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 value 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, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. If the value of the securities owned by the fund falls, 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. Interest rates have been historically low, so the fund faces a heightened risk that interest rates may rise. 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.

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 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. Subordinated securities 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, tend to be less liquid and are more difficult to value than higher grade securities. 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, currencies, or the derivatives themselves behave in a way not anticipated by the fund. 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 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. 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.

Credit default swap contracts involve heightened risks and may result in losses to the fund. Credit default swaps may be illiquid and difficult to value, and they increase credit risk since the fund has exposure to both the issuer whose credit is the subject of the swap and the counterparty to the swap.

Leveraging 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. 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.

Liquidity risk. Some assets held by the fund may be 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 recently 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, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of certain securities for an extended period (for example, several weeks or even longer).

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. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. 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 and political or financial instability. Lack of information may also affect the value of these securities. 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 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 fully developed and are less stable than those of more developed countries. Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by banks, agents and depositories that are less developed than those in the United States. 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.

Currency risk. 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 conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls and speculation.

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.

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 on prepaid 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.

Risk of investing in fewer issuers. To the extent the fund invests its assets in a small number of issuers, the fund will be more susceptible to negative events affecting those issuers.

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. 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.

Market events risk. In the past decade financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; declines in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment.

The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks, have taken steps to support financial markets, including by keeping interest rates at historically low levels. This and other government intervention may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results. The Federal Reserve has reduced its market support activities and recently has begun raising interest rates. Certain foreign governments and central banks are implementing or discussing so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the fund invests.

Policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation and may in some instances contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, 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 directly affected, the value and liquidity of the fund’s investments may be negatively affected.

Hedging risk. There can be no assurance that the fund will engage in hedging transactions at any given time, even under volatile market conditions, or that any hedging transactions the fund engages in will be successful. Hedging transactions involve costs and may reduce gains or result in losses.

Commodity risk. Investments in commodity-linked derivative instruments may subject the fund to greater volatility than investments in traditional securities. The value of commodity-linked derivative instruments may be affected by overall market movements, changes in interest rates or factors affecting a particular industry or commodity. The fund’s ability to gain exposure to commodities using derivatives, or other means, may be limited by tax considerations.

Risks relating to inflation-indexed securities. The value of inflation-indexed fixed income securities generally fluctuates in response to changes in real interest rates, which are in turn tied to the relationship between nominal interest rates and the rate of inflation. If nominal interest rates increase at a faster rate than inflation, real interest rates might rise, leading to a decrease in value of inflation-indexed securities. The fund may also experience a loss on an inflation-indexed security if there is deflation. If inflation is lower than expected during the period the fund holds an inflation-indexed security, the fund may earn less on the security than on a conventional bond.

Mortgage-backed and asset-backed securities risk. When market interest rates increase, the market values of mortgage-backed securities decline. At the same time, however, 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.

Portfolio management risk. The value of your investment may decrease if the subadvisers’ judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect, or if there are imperfections, errors or limitations in the tools and data used by the subadvisers. 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 subadvisers 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 at a loss or depressed value, which could cause the value of your investment to decline.

Cybersecurity risk. Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, customer data (including private shareholder information), or proprietary information, or cause the fund, the manager, the subadvisers 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.

These and other risks are discussed in more detail in the Prospectus or in the Statement of Additional Information.

<b>Performance </b>

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.leggmason.com/mutualfunds (select fund and share class), or by calling the fund at 1-877-721-1926.

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.

<b>Total returns</b> (%)<br/>Before taxes

Calendar Years ended December 31

Best Quarter (06/30/2009): 13.16     Worst Quarter (12/31/2008): (8.30)
The year-to-date return as of the most recent calendar quarter, which ended June 30, 2018, was (3.28)

<b>Average annual total returns (%)</b><br/>(for periods ended December 31, 2017)

Average Annual Total Returns - Western Asset Total Return Unconstrained Fund		1 year	5 years		10 years		Since inception	Inception date
Class I		7.69%	3.41%		4.73%
Class I | Return after taxes on distributions		6.01%	2.11%		3.25%
Class I | Return after taxes on distributions and sale of fund shares		4.33%	2.01%		3.04%
Class A		2.85%	2.23%			[1]	2.68%	Apr. 30, 2012
Class A2		2.71%		[1]		[1]	1.94%	May 01, 2014
Class C		5.63%	2.36%			[1]	2.71%	Apr. 30, 2012
Class FI		7.50%	3.16%		4.48%
Class R		7.20%	2.86%			[1]	3.21%	Apr. 30, 2012
Class IS		7.91%	3.50%			[1]	5.49%	Aug. 04, 2008
ICE BofA Merrill Lynch USD LIBOR 3-Month Constant Maturity Index (reflects no deduction for fees, expenses or taxes)	[2]	1.11%	0.51%		0.84%
Bloomberg Barclays U.S. Aggregate Index (reflects no deduction for fees, expenses or taxes)	[3]	3.54%	2.10%		4.01%

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.

[1] 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 “Sales charges” in the Prospectus.

[2] The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

[3] Maximum deferred sales charge (load) may be reduced over time.

[4] You may buy Class A or Class A2 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%.

[5] 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.

[1] “Other expenses” for Class A, A2, C, FI, R, and I shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements. For the fiscal year ended May 31, 2018, amounts recaptured totaled 0.01% for Class A shares, 0.06% for Class A2 shares, 0.02% for Class C shares, 0.03% for Class FI shares, 0.03% for Class R shares and 0.01% for Class I shares and these amounts are excluded from “Other expenses.”

[2] Total annual fund operating expenses have been restated to reflect current management fees.

[3] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage commissions, taxes, extraordinary expenses, deferred organizational expenses and acquired fund fees and expenses), so that the ratio of total annual fund operating expenses will not exceed 1.10% for Class A shares, 1.30% for Class A2 shares, 1.80% for Class C shares, 1.10% for Class FI shares, 1.35% for Class R shares, 0.75% for Class I shares and 0.65% 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, 2019 without the Board’s consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class within two 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.

[1] N/A

[2] For Class A, Class A2, Class C, Class R and Class IS shares, for the period from the class’ inception date to December 31, 2017, the average annual total return of the ICE BofA Merrill Lynch USD LIBOR 3-Month Constant Maturity Index was 0.50%, 0.59%, 0.50%, 0.50% and 0.65%, respectively.

[3] For Class A, Class A2, Class C, Class R and Class IS shares, for the period from the class’ inception date to December 31, 2017, the average annual total return of the Bloomberg Barclays U.S. Aggregate Index was 2.34%, 2.63%, 2.34%, 2.34% and 4.15%, respectively.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	WESTERN ASSET FUNDS INC
Prospectus Date	rr_ProspectusDate	Sep. 28, 2018
Western Asset Total Return Unconstrained Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	WESTERN ASSET <br/>TOTAL RETURN<br/>UNCONSTRAINED FUND
Objective [Heading]	rr_ObjectiveHeading	<b>Investment objective </b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Maximize long-term total return.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses of the fund </b>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund. 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 Legg Mason Investor Services, LLC (“LMIS”), 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 “Sales charges,” 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 83 under the heading “Sales Charge Waivers and Reductions for Class A or Class A2 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 LMIS 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	<b>Shareholder fees</b><br/>(fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual fund operating expenses (%)</b><br/>(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, 2019
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 most recent fiscal year, the fund’s portfolio turnover rate was 49% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	49.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	You may buy Class A or Class A2 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 Legg Mason Investor Services, LLC (“LMIS”), the fund’s distributor.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 100,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	“Other expenses” for Class A, A2, C, FI, R, and I shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements. <br/><br/>Total annual fund operating expenses have been restated to reflect current management fees.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example </b>
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 $10,000 in the fund for the time periods indicated Your investment has a 5% return each year and the fund’s operating expenses remain the same You reinvest all distributions and dividends without a sales charge Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	<b>Number of years you own your shares ($)</b>
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<b>Number of years you own your shares ($)</b>
Strategy [Heading]	rr_StrategyHeading	<b>Principal investment strategies </b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The fund has a flexible investment strategy and will invest in a variety of securities and instruments and use a variety of investment techniques in pursuing its objective. Under normal market conditions, the fund will invest at least 50% of its net assets in debt and fixed income securities rated at least in the Baa or BBB categories at the time of purchase by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”) or unrated securities of comparable quality at the time of purchase (as determined by the subadvisers). These securities are known as “investment grade securities.” The fund intends to invest a substantial portion of its assets in mortgage-backed and asset-backed securities. The fund may also enter into various exchange-traded and over-the-counter derivative transactions for both hedging and non-hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, bond and interest rate futures, options on bonds, options on bond and interest rate futures, swaps, foreign currency futures, forwards and options, options on swaps, options on forwards and commodity and commodity index futures, options, swaps and structured notes. In particular, the fund may use certain derivatives, including interest rate swaps, credit default swaps (including buying and selling credit default swaps on individual securities and/or baskets of securities), options (including options on credit default swaps), and/or futures contracts (including options on futures contracts) to a significant extent, although the amounts invested in these instruments may change from time to time. Other derivative instruments may also be used to a significant extent from time to time. The fund may use currency related transactions involving options and futures contracts (sometimes referred to as “futures”), indexed securities and other derivative instruments (collectively, “Financial Instruments”). These Financial Instruments may be used without limit, for either hedging purposes, or to implement a currency investment strategy. The subadvisers use fundamental investment techniques to select issues. In deciding among the securities and instruments in which the fund may invest, the subadvisers may take into account the credit quality, country of issue, interest rate, liquidity, maturity and yield of a security or instrument as well as other factors, including the fund’s dollar-weighted average effective duration and prevailing or anticipated market conditions. Although the fund may invest in securities of any maturity, the fund will normally maintain a dollar-weighted average effective duration (including futures positions), as estimated by the fund’s subadvisers, within the range of -3 to 8 years. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of structural complexities (for example, some bonds can be prepaid by the issuer). Although the fund may invest in debt and fixed income securities of any credit quality, including securities that are in default, under normal market conditions it is expected that the fund will maintain a dollar-weighted average credit quality of portfolio holdings of at least the Baa/BBB categories or their equivalent (as determined by the subadvisers). In addition, under normal market conditions, at the time of purchase: No more than 50% of the fund’s net assets may be invested in non-U.S. dollar denominated securities. No more than 25% of the fund’s net assets may be invested in un-hedged non-U.S. dollar denominated securities. No more than 25% of the fund’s net assets may be invested in non-U.S. dollar denominated securities that are not investment grade securities. Securities rated below investment grade are commonly known as “junk bonds” or “high yield securities.” No more than 25% of the fund’s net assets may be invested in securities of non-U.S. issuers that are not investment grade securities. No more than 50% of the fund’s net assets may be invested in a combination of non-U.S. dollar denominated securities, emerging market securities and securities that are not investment grade securities. The fund is permitted to invest in securities issued or guaranteed by the government of the United States or any of the G-7 countries, including their agencies, instrumentalities and political sub-divisions, without limit; however, (i) no more than 10% of the fund’s net assets may be invested in securities issued or guaranteed by a single government that is a non-G-7 country, including its agencies, instrumentalities and sub-divisions; (ii) no more than 10% of the fund’s net assets may be invested in private mortgage-backed and asset-backed securities of a single issuer unless the collateral relating to such securities is credit-independent of the issuer and the security’s credit enhancement is independent of the issuer, in which case no more than 25% of the fund’s net assets may be invested in private mortgage-backed and asset-backed securities of such issuer; and (iii) other than as described above, no more than 5% of the fund’s net assets may be invested in the obligations of any single issuer. The aggregate initial futures margin and options premiums required to establish commodity interest positions will not exceed 5% of the net assets of the fund, after taking into account unrealized profits and unrealized losses on any such positions; provided, however, that if an option is in-the-money at the time of purchase, the amount by which the option is in-the-money may be excluded in computing such 5%.
Risk [Heading]	rr_RiskHeading	<b>Principal risks </b>
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. The fund’s investment strategies and portfolio investments differ from those of many other mutual funds. This approach to investing may make the fund a more volatile investment than other mutual funds and cause the fund to perform less favorably than other mutual funds under similar market or economic conditions. 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 value 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, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. If the value of the securities owned by the fund falls, 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. Interest rates have been historically low, so the fund faces a heightened risk that interest rates may rise. 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. 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 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. Subordinated securities 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, tend to be less liquid and are more difficult to value than higher grade securities. 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, currencies, or the derivatives themselves behave in a way not anticipated by the fund. 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 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. 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. Credit default swap contracts involve heightened risks and may result in losses to the fund. Credit default swaps may be illiquid and difficult to value, and they increase credit risk since the fund has exposure to both the issuer whose credit is the subject of the swap and the counterparty to the swap. Leveraging 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. 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. Liquidity risk. Some assets held by the fund may be 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 recently 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, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of certain securities for an extended period (for example, several weeks or even longer). 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. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. 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 and political or financial instability. Lack of information may also affect the value of these securities. 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 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 fully developed and are less stable than those of more developed countries. Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by banks, agents and depositories that are less developed than those in the United States. 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. Currency risk. 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 conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls and speculation. 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. 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 on prepaid 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. Risk of investing in fewer issuers. To the extent the fund invests its assets in a small number of issuers, the fund will be more susceptible to negative events affecting those issuers. 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. 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. Market events risk. In the past decade financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; declines in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks, have taken steps to support financial markets, including by keeping interest rates at historically low levels. This and other government intervention may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results. The Federal Reserve has reduced its market support activities and recently has begun raising interest rates. Certain foreign governments and central banks are implementing or discussing so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the fund invests. Policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation and may in some instances contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time. Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, 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 directly affected, the value and liquidity of the fund’s investments may be negatively affected. Hedging risk. There can be no assurance that the fund will engage in hedging transactions at any given time, even under volatile market conditions, or that any hedging transactions the fund engages in will be successful. Hedging transactions involve costs and may reduce gains or result in losses. Commodity risk. Investments in commodity-linked derivative instruments may subject the fund to greater volatility than investments in traditional securities. The value of commodity-linked derivative instruments may be affected by overall market movements, changes in interest rates or factors affecting a particular industry or commodity. The fund’s ability to gain exposure to commodities using derivatives, or other means, may be limited by tax considerations. Risks relating to inflation-indexed securities. The value of inflation-indexed fixed income securities generally fluctuates in response to changes in real interest rates, which are in turn tied to the relationship between nominal interest rates and the rate of inflation. If nominal interest rates increase at a faster rate than inflation, real interest rates might rise, leading to a decrease in value of inflation-indexed securities. The fund may also experience a loss on an inflation-indexed security if there is deflation. If inflation is lower than expected during the period the fund holds an inflation-indexed security, the fund may earn less on the security than on a conventional bond. Mortgage-backed and asset-backed securities risk. When market interest rates increase, the market values of mortgage-backed securities decline. At the same time, however, 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. Portfolio management risk. The value of your investment may decrease if the subadvisers’ judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates, is incorrect, or if there are imperfections, errors or limitations in the tools and data used by the subadvisers. 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 subadvisers 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 at a loss or depressed value, which could cause the value of your investment to decline. Cybersecurity risk. Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, customer data (including private shareholder information), or proprietary information, or cause the fund, the manager, the subadvisers 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. 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	<b>Performance </b>
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.leggmason.com/mutualfunds (select fund and share class), or by calling the fund at 1-877-721-1926. 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]	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	1-877-721-1926
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.leggmason.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	<b>Total returns</b> (%)<br/>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 (06/30/2009): 13.16     Worst Quarter (12/31/2008): (8.30) The year-to-date return as of the most recent calendar quarter, which ended June 30, 2018, was (3.28)
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns (%)</b><br/>(for periods ended December 31, 2017)
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.
Western Asset Total Return Unconstrained Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.25%	[1],[2]
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none	[3],[4]
Small account fee ($)	rr_MaximumAccountFee	$ 15	[5]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.33%	[6]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.18%	[7]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.08%)	[8]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.10%
1 year	rr_ExpenseExampleYear01	$ 532
3 years	rr_ExpenseExampleYear03	776
5 years	rr_ExpenseExampleYear05	1,039
10 years	rr_ExpenseExampleYear10	1,789
1 year	rr_ExpenseExampleNoRedemptionYear01	532
3 years	rr_ExpenseExampleNoRedemptionYear03	776
5 years	rr_ExpenseExampleNoRedemptionYear05	1,039
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,789
1 year	rr_AverageAnnualReturnYear01	2.85%
5 years	rr_AverageAnnualReturnYear05	2.23%
10 years	rr_AverageAnnualReturnYear10		[9]
Since inception	rr_AverageAnnualReturnSinceInception	2.68%
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2012
Western Asset Total Return Unconstrained Fund | Class A2
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.25%
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)	rr_MaximumDeferredSalesChargeOverOther	none	[3],[4]
Small account fee ($)	rr_MaximumAccountFee	$ 15	[5]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.30%	[6]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.15%	[7]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[8]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.15%
1 year	rr_ExpenseExampleYear01	$ 537
3 years	rr_ExpenseExampleYear03	775
5 years	rr_ExpenseExampleYear05	1,032
10 years	rr_ExpenseExampleYear10	1,765
1 year	rr_ExpenseExampleNoRedemptionYear01	537
3 years	rr_ExpenseExampleNoRedemptionYear03	775
5 years	rr_ExpenseExampleNoRedemptionYear05	1,032
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,765
1 year	rr_AverageAnnualReturnYear01	2.71%
5 years	rr_AverageAnnualReturnYear05		[9]
10 years	rr_AverageAnnualReturnYear10		[9]
Since inception	rr_AverageAnnualReturnSinceInception	1.94%
Inception date	rr_AverageAnnualReturnInceptionDate	May 01, 2014
Western Asset Total Return Unconstrained 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%	[3]
Small account fee ($)	rr_MaximumAccountFee	$ 15	[5]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.15%	[6]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.75%	[7]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[8]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.75%
1 year	rr_ExpenseExampleYear01	$ 278
3 years	rr_ExpenseExampleYear03	552
5 years	rr_ExpenseExampleYear05	950
10 years	rr_ExpenseExampleYear10	2,063
1 year	rr_ExpenseExampleNoRedemptionYear01	178
3 years	rr_ExpenseExampleNoRedemptionYear03	552
5 years	rr_ExpenseExampleNoRedemptionYear05	950
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 2,063
1 year	rr_AverageAnnualReturnYear01	5.63%
5 years	rr_AverageAnnualReturnYear05	2.36%
10 years	rr_AverageAnnualReturnYear10		[9]
Since inception	rr_AverageAnnualReturnSinceInception	2.71%
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2012
Western Asset Total Return Unconstrained Fund | Class FI
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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.16%	[6]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.01%	[7]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[8]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.01%
1 year	rr_ExpenseExampleYear01	$ 103
3 years	rr_ExpenseExampleYear03	321
5 years	rr_ExpenseExampleYear05	557
10 years	rr_ExpenseExampleYear10	1,234
1 year	rr_ExpenseExampleNoRedemptionYear01	103
3 years	rr_ExpenseExampleNoRedemptionYear03	321
5 years	rr_ExpenseExampleNoRedemptionYear05	557
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,234
1 year	rr_AverageAnnualReturnYear01	7.50%
5 years	rr_AverageAnnualReturnYear05	3.16%
10 years	rr_AverageAnnualReturnYear10	4.48%
Western Asset Total Return Unconstrained 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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.21%	[6]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.31%	[7]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[8]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	1.31%
1 year	rr_ExpenseExampleYear01	$ 133
3 years	rr_ExpenseExampleYear03	414
5 years	rr_ExpenseExampleYear05	717
10 years	rr_ExpenseExampleYear10	1,578
1 year	rr_ExpenseExampleNoRedemptionYear01	133
3 years	rr_ExpenseExampleNoRedemptionYear03	414
5 years	rr_ExpenseExampleNoRedemptionYear05	717
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,578
1 year	rr_AverageAnnualReturnYear01	7.20%
5 years	rr_AverageAnnualReturnYear05	2.86%
10 years	rr_AverageAnnualReturnYear10		[9]
Since inception	rr_AverageAnnualReturnSinceInception	3.21%
Inception date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2012
Western Asset Total Return Unconstrained 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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.15%	[6]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.75%	[7]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets		[8]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.75%
1 year	rr_ExpenseExampleYear01	$ 77
3 years	rr_ExpenseExampleYear03	240
5 years	rr_ExpenseExampleYear05	417
10 years	rr_ExpenseExampleYear10	930
1 year	rr_ExpenseExampleNoRedemptionYear01	77
3 years	rr_ExpenseExampleNoRedemptionYear03	240
5 years	rr_ExpenseExampleNoRedemptionYear05	417
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 930
2008	rr_AnnualReturn2008	(14.84%)
2009	rr_AnnualReturn2009	32.89%
2010	rr_AnnualReturn2010	8.14%
2011	rr_AnnualReturn2011	2.04%
2012	rr_AnnualReturn2012	7.53%
2013	rr_AnnualReturn2013	1.18%
2014	rr_AnnualReturn2014	2.60%
2015	rr_AnnualReturn2015	0.25%
2016	rr_AnnualReturn2016	5.53%
2017	rr_AnnualReturn2017	7.69%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(3.28%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<b>Best Quarter</b>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	13.16%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<b>Worst Quarter</b>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(8.30%)
1 year	rr_AverageAnnualReturnYear01	7.69%
5 years	rr_AverageAnnualReturnYear05	3.41%
10 years	rr_AverageAnnualReturnYear10	4.73%
Western Asset Total Return Unconstrained 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	[3]
Small account fee ($)	rr_MaximumAccountFee	none	[5]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.06%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.66%	[7]
Fees waived and/or expenses reimbursed	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[8]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	rr_NetExpensesOverAssets	0.65%
1 year	rr_ExpenseExampleYear01	$ 66
3 years	rr_ExpenseExampleYear03	209
5 years	rr_ExpenseExampleYear05	366
10 years	rr_ExpenseExampleYear10	821
1 year	rr_ExpenseExampleNoRedemptionYear01	66
3 years	rr_ExpenseExampleNoRedemptionYear03	209
5 years	rr_ExpenseExampleNoRedemptionYear05	366
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 821
1 year	rr_AverageAnnualReturnYear01	7.91%
5 years	rr_AverageAnnualReturnYear05	3.50%
10 years	rr_AverageAnnualReturnYear10		[9]
Since inception	rr_AverageAnnualReturnSinceInception	5.49%
Inception date	rr_AverageAnnualReturnInceptionDate	Aug. 04, 2008
Western Asset Total Return Unconstrained Fund | Return after taxes on distributions | Class I
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	6.01%
5 years	rr_AverageAnnualReturnYear05	2.11%
10 years	rr_AverageAnnualReturnYear10	3.25%
Western Asset Total Return Unconstrained Fund | Return after taxes on distributions and sale of fund shares | Class I
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	4.33%
5 years	rr_AverageAnnualReturnYear05	2.01%
10 years	rr_AverageAnnualReturnYear10	3.04%
Western Asset Total Return Unconstrained Fund | ICE BofA Merrill Lynch USD LIBOR 3-Month Constant Maturity Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	1.11%	[10]
5 years	rr_AverageAnnualReturnYear05	0.51%	[10]
10 years	rr_AverageAnnualReturnYear10	0.84%	[10]
Western Asset Total Return Unconstrained Fund | Bloomberg Barclays U.S. Aggregate Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.54%	[11]
5 years	rr_AverageAnnualReturnYear05	2.10%	[11]
10 years	rr_AverageAnnualReturnYear10	4.01%	[11]

[1] 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 “Sales charges” in the Prospectus.

[2] The sales charge is waived for shareholders purchasing Class A shares through accounts where LMIS is the broker-dealer of record (“LMIS Accounts”).

[3] Maximum deferred sales charge (load) may be reduced over time.

[4] You may buy Class A or Class A2 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%.

[5] 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.

[6] “Other expenses” for Class A, A2, C, FI, R, and I shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements. For the fiscal year ended May 31, 2018, amounts recaptured totaled 0.01% for Class A shares, 0.06% for Class A2 shares, 0.02% for Class C shares, 0.03% for Class FI shares, 0.03% for Class R shares and 0.01% for Class I shares and these amounts are excluded from “Other expenses.”

[7] Total annual fund operating expenses have been restated to reflect current management fees.

[8] The manager has agreed to waive fees and/or reimburse operating expenses (other than interest, brokerage commissions, taxes, extraordinary expenses, deferred organizational expenses and acquired fund fees and expenses), so that the ratio of total annual fund operating expenses will not exceed 1.10% for Class A shares, 1.30% for Class A2 shares, 1.80% for Class C shares, 1.10% for Class FI shares, 1.35% for Class R shares, 0.75% for Class I shares and 0.65% 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, 2019 without the Board’s consent. The manager is permitted to recapture amounts waived and/or reimbursed to a class within two 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.

[9] N/A

[10] For Class A, Class A2, Class C, Class R and Class IS shares, for the period from the class’ inception date to December 31, 2017, the average annual total return of the ICE BofA Merrill Lynch USD LIBOR 3-Month Constant Maturity Index was 0.50%, 0.59%, 0.50%, 0.50% and 0.65%, respectively.

[11] For Class A, Class A2, Class C, Class R and Class IS shares, for the period from the class’ inception date to December 31, 2017, the average annual total return of the Bloomberg Barclays U.S. Aggregate Index was 2.34%, 2.63%, 2.34%, 2.34% and 4.15%, respectively.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	WESTERN ASSET FUNDS INC
Prospectus Date	rr_ProspectusDate	Sep. 28, 2018
Document Creation Date	dei_DocumentCreationDate	Sep. 24, 2018