Foreign Government Bonds [Member] Morningstar Multisector Bond Category Average [Member] Other Assets Less Liabilities [Member] U S Government And Federal Agencies [Member] FHLMC STACR Trust 8 56 15 01 due 9 25 47 7 25 49 [Member] Exeter Automobile Receivables Trust 5 57 7 52 due 10 15 29 6 15 33 [Member] Flagship Credit Auto Trust 1 59 8 83 due 6 15 27 1 15 32 [Member] UMBS 30 Year 5 00 5 50 due 9 1 53 2 1 55 [Member] U S Treasury Bonds 4 625 4 75 due 2 15 46 2 15 56 [Member] FHLMC MSCR Trust 5 945 9 646 due 5 25 44 11 25 51 [Member] GNMA zero coupon 5 02 due 7 20 44 3 16 66 [Member] FHLMC STACR REMIC Trust 4 845 12 145 due 1 25 34 1 25 50 [Member] Connecticut Avenue Securities Trust 5 145 13 01 due 11 25 39 2 25 45 [Member] U S Treasury Notes 3 875 4 125 due 4 30 31 2 15 36 [Member] C000060790 [Member] Investor Class C000185554 [Member] Class R6 C000018688 [Member] Class I C000018687 [Member] Class C C000018685 [Member] Class A Collateralized Mortgage-Backed Securities [Member] Asset-Backed Securities [Member] Common Stock [Member] Short-Term Investments [Member] Loan Participations and Assignments [Member] Corporate Bond Securities [Member] Municipal Bonds [Member] C000018689 [Member] C000018691 [Member] C000018692 [Member] C000185556 [Member] C000060791 [Member] State of Hawaii 1 718 5 159 due 10 1 30 10 1 41 [Member] City of New York 1 623 5 75 due 8 1 28 2 1 42 [Member] State of California 5 10 7 60 due 9 1 35 10 1 41 [Member] State of Illinois 3 45 7 35 due 6 15 29 12 1 38 [Member] Commonwealth of Massachusetts 1 929 5 50 due 7 15 29 9 1 43 [Member] State of Texas 1 844 5 157 due 10 1 30 10 1 38 [Member] New York State Dormitory Authority 2 746 5 289 due 7 1 30 7 1 35 [Member] Massachusetts Educational Financing Authority 5 95 6 166 due 7 1 44 7 1 50 [Member] New York City Housing Development Corp 5 458 6 033 due 12 15 31 [Member] New York City Transitional Finance Authority 1 97 5 65 due 11 1 30 11 1 35 [Member] Bloomberg U S Aggregate Bond Index [Member] Bloomberg 5 10 Year Taxable Municipal Bond Index [Member] Morningstar Intermediate Core Bond Category Average [Member] Bloomberg 5 10 Year Taxable Municipal Bond C000018691 Index [Member] Jane Street Group 6 125 7 125 due 4 30 31 5 1 33 [Member] Foreign Government Bond [Member] Convertible Bonds [Member] LifePoint Health Inc 5 375 10 00 due 1 15 29 5 1 34 [Member] NRG Energy Inc 5 75 6 25 due 2 1 33 5 15 36 [Member] ICE BofA U S High Yield Constrained Index [Member] IHO Verwaltungs GmbH 6 375 8 00 due 5 15 29 5 15 33 [Member] Yum Brands Inc 3 625 5 375 due 1 15 30 4 1 32 [Member] Churchill Downs Inc 4 75 6 75 due 4 1 27 5 1 31 [Member] Hilton Domestic Operating Co Inc 4 00 5 875 due 1 15 30 3 31 34 [Member] Talen Energy Supply LLC 6 125 6 50 due 5 17 30 2 1 36 [Member] CCO Holdings LLC 4 25 5 375 due 5 1 27 1 15 34 [Member] TransDigm Inc 4 625 7 125 due 8 15 28 1 31 34 [Member] Morningstar High Yield Bond Category Average [Member] ICE BofA U S High Yield Constrained C000018695 Index [Member] Bloomberg U S Aggregate Bond C000018695 Index [Member] C000221691 [Member] SIMPLE Class C000060792 [Member] C000127160 [Member] C000166835 [Member] Class R3 C000057099 [Member] Class R2 C000018696 [Member] C000018695 [Member] C000018693 [Member] Preferred Stock [Member] Exchange Traded Funds [Member] Commercial Paper [Member] Repurchase Agreements [Member] C000018697 [Member] C000018699 [Member] C000060793 [Member] C000221692 [Member] Bloomberg Municipal Bond C000018702 Index [Member] Morningstar Muni National Long Category Average [Member] Bloomberg Municipal Bond Index [Member] Other [Member] Chicago Board of Education zero coupon 6 00 due 12 1 26 4 1 48 [Member] Southeast Energy Authority A Cooperative District 4 00 5 25 due 11 1 35 1 1 56 [Member] Main Street Natural Gas Inc 4 00 5 50 due 9 15 27 5 1 55 [Member] San Francisco City And County Airport Commission 5 00 5 50 due 5 1 31 5 1 55 [Member] New York City Transitional Finance Authority 3 00 5 50 due 5 1 40 5 1 53 [Member] Black Belt Energy Gas District 3 74 5 50 due 12 1 34 12 1 55 [Member] Chicago O Hare International Airport 4 00 5 50 due 1 1 28 1 1 60 [Member] Los Angeles Department of Water And Power 5 00 6 603 due 7 1 28 7 1 53 [Member] California Community Choice Financing Authority 3 902 5 25 due 11 1 33 4 1 56 [Member] New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 11 1 64 [Member] C000060794 [Member] C000185560 [Member] C000082082 [Member] C000221693 [Member] Class C2 C000018702 [Member] C000018700 [Member] TEXAS PENNSYLVANIA NEW YORK NEW HAMPSHIRE MASSACHUSETTS ILLINOIS GEORGIA FLORIDA CALIFORNIA ALABAMA Convertible Preferred Stock [Member] C000018703 [Member] C000018705 [Member] C000087595 [Member] C000060795 [Member] C000221696 [Member] C000060796 [Member] C000185564 [Member] C000018709 [Member] C000018708 [Member] C000018706 [Member] ARGENTINA BRAZIL CHILE DOMINICAN REPUBLIC EGYPT HUNGARY MEXICO NIGERIA ROMANIA C000018710 [Member] C000018712 [Member] C000052120 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Instruments And Components [Member] Machinery [Member] Commercial Services And Supplies [Member] Expeditors International of Washington Inc [Member] Old Dominion Freight Line Inc [Member] Credit Acceptance Corp [Member] Amphenol Corp Class A [Member] Progressive Corp The [Member] Constellation Software Inc [Member] NVR Inc [Member] M And T Bank Corp [Member] PACCAR Inc [Member] Linde plc [Member] Morningstar Large Blend Category Average [Member] Russell 3000 Index [Member] C000060799 [Member] C000179143 [Member] C000018722 [Member] C000018721 [Member] C000018719 [Member] Standard & Poor's 500 Index [Member] Insurance Sector [Member] Chemicals Sector [Member] Financial Services Sector [Member] C000018724 [Member] C000018726 [Member] C000018727 [Member] C000018728 [Member]