Class A - C000044916 Class A Class C - C000044917 Class C Class C2 - C000222209 Class C2 Class I - C000044918 Class I Class IS - C000183975 Class IS Industry Sector:1C000044916-Transportation Transportation [Member] Industry Sector:2C000044916-Industrial Revenue Industrial Revenue [Member] Industry Sector:3C000044916-Power Power [Member] Industry Sector:4C000044916-Leasing Leasing [Member] Industry Sector:5C000044916-Local General Obligation Local General Obligation [Member] Industry Sector:6C000044916-State General Obligation State General Obligation [Member] Industry Sector:7C000044916-Health Care Health Care [Member] Industry Sector:8C000044916-Special Tax Obligation Special Tax Obligation [Member] Industry Sector:9C000044916-Housing Housing [Member] Industry Sector:10C000044916-Education Education [Member] Industry Sector:11C000044916-Pre-Refunded/Escrowed to Maturity Pre-Refunded/Escrowed to Maturity [Member] Industry Sector:12C000044916-Water & Sewer Water & Sewer [Member] Industry Sector:13C000044916-Short-Term Investments Short-Term Investments [Member] Industry Sector:14C000044917-Transportation Transportation [Member] Industry Sector:15C000044917-Industrial Revenue Industrial Revenue [Member] Industry Sector:16C000044917-Power Power [Member] Industry Sector:17C000044917-Leasing Leasing [Member] Industry Sector:18C000044917-Local General Obligation Local General Obligation [Member] Industry Sector:19C000044917-State General Obligation State General Obligation [Member] Industry Sector:20C000044917-Health Care Health Care [Member] Industry Sector:21C000044917-Special Tax Obligation Special Tax Obligation [Member] Industry Sector:22C000044917-Housing Housing [Member] Industry Sector:23C000044917-Education Education [Member] Industry Sector:24C000044917-Pre-Refunded/Escrowed to Maturity Pre-Refunded/Escrowed to Maturity [Member] Industry Sector:25C000044917-Water & Sewer Water & Sewer [Member] Industry Sector:26C000044917-Short-Term Investments Short-Term Investments [Member] Industry Sector:27C000222209-Transportation Transportation [Member] Industry Sector:28C000222209-Industrial Revenue Industrial Revenue [Member] Industry Sector:29C000222209-Power Power [Member] Industry Sector:30C000222209-Leasing Leasing [Member] Industry Sector:31C000222209-Local General Obligation Local General Obligation [Member] Industry Sector:32C000222209-State General Obligation State General Obligation [Member] Industry Sector:33C000222209-Health Care Health Care [Member] Industry Sector:34C000222209-Special Tax Obligation Special Tax Obligation [Member] Industry Sector:35C000222209-Housing Housing [Member] Industry Sector:36C000222209-Education Education [Member] Industry Sector:37C000222209-Pre-Refunded/Escrowed to Maturity Pre-Refunded/Escrowed to Maturity [Member] Industry Sector:38C000222209-Water & Sewer Water & Sewer [Member] Industry Sector:39C000222209-Short-Term Investments Short-Term Investments [Member] Industry Sector:40C000044918-Transportation Transportation [Member] Industry Sector:41C000044918-Industrial Revenue Industrial Revenue [Member] Industry Sector:42C000044918-Power Power [Member] Industry Sector:43C000044918-Leasing Leasing [Member] Industry Sector:44C000044918-Local General Obligation Local General Obligation [Member] Industry Sector:45C000044918-State General Obligation State General Obligation [Member] Industry Sector:46C000044918-Health Care Health Care [Member] Industry Sector:47C000044918-Special Tax Obligation Special Tax Obligation [Member] Industry Sector:48C000044918-Housing Housing [Member] Industry Sector:49C000044918-Education Education [Member] Industry Sector:50C000044918-Pre-Refunded/Escrowed to Maturity Pre-Refunded/Escrowed to Maturity [Member] Industry Sector:51C000044918-Water & Sewer Water & Sewer [Member] Industry Sector:52C000044918-Short-Term Investments Short-Term Investments [Member] Industry Sector:53C000183975-Transportation Transportation [Member] Industry Sector:54C000183975-Industrial Revenue Industrial Revenue [Member] Industry Sector:55C000183975-Power Power [Member] Industry Sector:56C000183975-Leasing Leasing [Member] Industry Sector:57C000183975-Local General Obligation Local General Obligation [Member] Industry Sector:58C000183975-State General Obligation State General Obligation [Member] Industry Sector:59C000183975-Health Care Health Care [Member] Industry Sector:60C000183975-Special Tax Obligation Special Tax Obligation [Member] Industry Sector:61C000183975-Housing Housing [Member] Industry Sector:62C000183975-Education Education [Member] Industry Sector:63C000183975-Pre-Refunded/Escrowed to Maturity Pre-Refunded/Escrowed to Maturity [Member] Industry Sector:64C000183975-Water & Sewer Water & Sewer [Member] Industry Sector:65C000183975-Short-Term Investments Short-Term Investments [Member] Net Assets Investment Company Portfolio Turnover Portfolio Turnover Commodity Index Linked Notes [Member] Commodity Index Linked Notes Sovereign Debt Securities [Member] Sovereign Debt Securities Convertible Debt Securities [Member] Convertible Debt Securities Corporate Debt Securities [Member] Corporate Debt Securities Corporate Note Securities [Member] Corporate Note Securities Corporate Bond Securities [Member] Corporate Bond Securities Fixed Income Investments [Member] Fixed Income Investments Securities Investment [Member] Securities Investment Other Aggregated Investments [Member] Other Aggregated Investments Real Estate Sector [Member] Real Estate Sector Standard Poors 500 Index [Member] Standard Poors 500 Index Nasdaq Composite Index [Member] Nasdaq Composite Index Equity Securities Industry [Member] Equity Securities Industry Equity Securities [Member] Equity Securities Dow Jones Industrial Average [Member] Dow Jones Industrial Average Construction Sector [Member] Construction Sector Automotive Sector [Member] Automotive Sector Transportation Sector [Member] Transportation Sector Aerospace Sector [Member] Aerospace Sector Consumer Sector [Member] Consumer Sector Chemicals Sector [Member] Chemicals Sector Insurance Sector [Member] Insurance Sector Cash [Member] Cash Asset Backed Securities [Member] Asset Backed Securities Container And PackagingSector [Member] Container And PackagingSector Investment Type [Axis] Asset Class US Treasury Securities [Member] US Treasury Securities Mortgage Backed Securities [Member] Mortgage Backed Securities Investment Type Categorization [Member] Investment Type Categorization Entertainment Sector [Member] Entertainment Sector Food And Beverage Sector [Member] Food And Beverage Sector Financial Services Sector [Member] Financial Services Sector Healthcare Sector [Member] Healthcare Sector Energy Sector [Member] Energy Sector Technology Sector [Member] Technology Sector Government Sector [Member] Government Sector No Trading Symbol