v3.26.1
S000000715 [Member] Shareholder Fees - Western Asset Inflation Indexed Plus Bond Fund
Dec. 31, 2025
USD ($)
Class FI  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00% [1]
Maximum Account Fee $ 0 [2]
Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00% [1]
Maximum Account Fee $ 0 [2]
Class IS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00% [1]
Maximum Account Fee $ 0 [2]
CLASS A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 3.75% [3],[4]
Maximum Deferred Sales Charge (as a percentage) 0.00% [1],[5]
Maximum Account Fee $ 15 [2]
CLASS C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 1.00% [1]
Maximum Account Fee $ 15 [2]
CLASS R  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00% [1]
Maximum Account Fee $ 0 [2]
Class C1  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00% [1]
Maximum Account Fee $ 15 [2]
[1]
Maximum deferred sales charge (load) may be reduced over time.
[2]
If the value of your account is below $1,000 ($250 for retirement plans that are not employer-sponsored), the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly by the fund or your Service Agent (with an annual maximum of $15.00 per account). Please contact your Service Agent or the fund for more information.
[3] Shareholders purchasing Class A shares through certain Service Agents or in certain types of accounts may be eligible for a waiver of the sales charge. For additional information, see “Additional information about each share class — Sales charges” in the Prospectus.
[4] The sales charge is waived for shareholders purchasing Class A shares through accounts where Franklin Distributors is the broker-dealer of record (“Distributor Accounts”).
[5]
You may buy Class A shares in amounts of $500,000 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%.