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Class C2 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 420050 - Disclosure - Class C2 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 420060 - Disclosure - Class C2 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 420070 - Disclosure - Class C2 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 410000 - Disclosure - Class C2 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 410001 - Disclosure - Class C2 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink Western Asset Managed Municipals Fund S000016628 [Member] Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses or taxes) S000016628 Bloomberg Municipal Bond Index [Member] Class A C000046426 [Member] Class B C000046427 [Member] Class C C000046428 [Member] Class I C000046429 [Member] Class 1 C000046430 [Member] Class FI C000064957 [Member] Class IS C000184045 [Member] Market events risk [Member] Inflation risk [Member] Credit risks [Member] High yield junk bonds risk [Member] Derivatives risks [Member] Leverage risk [Member] Tender option bond risk [Member] Illiquidity risk [Member] Tax risk [Member] Prepayment or call risk [Member] Extension risk [Member] Risk of investing in fewer issuers [Member] Risks relating to investments in municipal securities [Member] Investing in ETFs risk [Member] Valuation risk [Member] Portfolio management risk [Member] Redemption risk [Member] Cybersecurity risk [Member] Market and interest rate risk [Member] Class A, C, FI, I and Class IS Class A C F I I And Class I S [Member] Western Asset Short Duration Municipal Income Fund S000016249 [Member] S000016249 Bloomberg Municipal Bond Index [Member] Bloomberg Municipal 3 Year (2-4) Index (reflects no deduction for fees, expenses or taxes) S000016249 Bloomberg Municipal 3 Year 2 4 Index [Member] C000044916 [Member] C000044917 [Member] C000044918 [Member] C000059841 [Member] C000183975 [Member] Transportation bond risk [Member] Western Asset California Municipals Fund S000016644 [Member] S000016644 Bloomberg Municipal Bond Index [Member] Bloomberg California Municipal Bond Index (reflects no deduction for fees, expenses or taxes) S000016644 Bloomberg California Municipal Bond Index [Member] C000046486 [Member] C000046487 [Member] C000046488 [Member] C000046489 [Member] C000064958 [Member] C000192834 [Member] Risks associated with focusing on investments in California municipal securities [Member] Industrial development bonds risk [Member] Class C2 Class C2 [Member] C000222209 [Member]