v3.26.1
Shareholder Report, Holdings (Details)
Apr. 30, 2026
C000060790 [Member] | FHLMC STACR Trust 8 56 15 01 due 9 25 47 7 25 49 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [1]
C000060790 [Member] | Exeter Automobile Receivables Trust 5 57 7 52 due 10 15 29 6 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [1]
C000060790 [Member] | Flagship Credit Auto Trust 1 59 8 83 due 6 15 27 1 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [1]
C000060790 [Member] | UMBS 30 Year 5 00 5 50 due 9 1 53 2 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [1]
C000060790 [Member] | U S Treasury Bonds 4 625 4 75 due 2 15 46 2 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [1]
C000060790 [Member] | FHLMC MSCR Trust 5 945 9 646 due 5 25 44 11 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [1]
C000060790 [Member] | GNMA zero coupon 5 02 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [1]
C000060790 [Member] | FHLMC STACR REMIC Trust 4 845 12 145 due 1 25 34 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [1]
C000060790 [Member] | Connecticut Avenue Securities Trust 5 145 13 01 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [1]
C000060790 [Member] | U S Treasury Notes 3 875 4 125 due 4 30 31 2 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60% [1]
C000060790 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000060790 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.20%)
C000060790 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.60%
C000060790 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000060790 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
C000060790 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
C000060790 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000060790 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000060790 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 33.90%
C000185554 [Member] | FHLMC STACR Trust 8 56 15 01 due 9 25 47 7 25 49 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [3]
C000185554 [Member] | Exeter Automobile Receivables Trust 5 57 7 52 due 10 15 29 6 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [3]
C000185554 [Member] | Flagship Credit Auto Trust 1 59 8 83 due 6 15 27 1 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [3]
C000185554 [Member] | UMBS 30 Year 5 00 5 50 due 9 1 53 2 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [3]
C000185554 [Member] | U S Treasury Bonds 4 625 4 75 due 2 15 46 2 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [3]
C000185554 [Member] | FHLMC MSCR Trust 5 945 9 646 due 5 25 44 11 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [3]
C000185554 [Member] | GNMA zero coupon 5 02 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [3]
C000185554 [Member] | FHLMC STACR REMIC Trust 4 845 12 145 due 1 25 34 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [3]
C000185554 [Member] | Connecticut Avenue Securities Trust 5 145 13 01 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [3]
C000185554 [Member] | U S Treasury Notes 3 875 4 125 due 4 30 31 2 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60% [3]
C000185554 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000185554 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.20%)
C000185554 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.60%
C000185554 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000185554 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
C000185554 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [4]
C000185554 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000185554 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000185554 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 33.90%
C000018688 [Member] | FHLMC STACR Trust 8 56 15 01 due 9 25 47 7 25 49 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [5]
C000018688 [Member] | Exeter Automobile Receivables Trust 5 57 7 52 due 10 15 29 6 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [5]
C000018688 [Member] | Flagship Credit Auto Trust 1 59 8 83 due 6 15 27 1 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [5]
C000018688 [Member] | UMBS 30 Year 5 00 5 50 due 9 1 53 2 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [5]
C000018688 [Member] | U S Treasury Bonds 4 625 4 75 due 2 15 46 2 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [5]
C000018688 [Member] | FHLMC MSCR Trust 5 945 9 646 due 5 25 44 11 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [5]
C000018688 [Member] | GNMA zero coupon 5 02 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [5]
C000018688 [Member] | FHLMC STACR REMIC Trust 4 845 12 145 due 1 25 34 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [5]
C000018688 [Member] | Connecticut Avenue Securities Trust 5 145 13 01 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [5]
C000018688 [Member] | U S Treasury Notes 3 875 4 125 due 4 30 31 2 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60% [5]
C000018688 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000018688 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.20%)
C000018688 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.60%
C000018688 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000018688 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
C000018688 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [6]
C000018688 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018688 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018688 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 33.90%
C000018687 [Member] | FHLMC STACR Trust 8 56 15 01 due 9 25 47 7 25 49 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [7]
C000018687 [Member] | Exeter Automobile Receivables Trust 5 57 7 52 due 10 15 29 6 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [7]
C000018687 [Member] | Flagship Credit Auto Trust 1 59 8 83 due 6 15 27 1 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [7]
C000018687 [Member] | UMBS 30 Year 5 00 5 50 due 9 1 53 2 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [7]
C000018687 [Member] | U S Treasury Bonds 4 625 4 75 due 2 15 46 2 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [7]
C000018687 [Member] | FHLMC MSCR Trust 5 945 9 646 due 5 25 44 11 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [7]
C000018687 [Member] | GNMA zero coupon 5 02 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [7]
C000018687 [Member] | FHLMC STACR REMIC Trust 4 845 12 145 due 1 25 34 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [7]
C000018687 [Member] | Connecticut Avenue Securities Trust 5 145 13 01 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [7]
C000018687 [Member] | U S Treasury Notes 3 875 4 125 due 4 30 31 2 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60% [7]
C000018687 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000018687 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.20%)
C000018687 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.60%
C000018687 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000018687 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
C000018687 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [8]
C000018687 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018687 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018687 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 33.90%
C000018685 [Member] | FHLMC STACR Trust 8 56 15 01 due 9 25 47 7 25 49 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [9]
C000018685 [Member] | Exeter Automobile Receivables Trust 5 57 7 52 due 10 15 29 6 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [9]
C000018685 [Member] | Flagship Credit Auto Trust 1 59 8 83 due 6 15 27 1 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [9]
C000018685 [Member] | UMBS 30 Year 5 00 5 50 due 9 1 53 2 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [9]
C000018685 [Member] | U S Treasury Bonds 4 625 4 75 due 2 15 46 2 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [9]
C000018685 [Member] | FHLMC MSCR Trust 5 945 9 646 due 5 25 44 11 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [9]
C000018685 [Member] | GNMA zero coupon 5 02 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [9]
C000018685 [Member] | FHLMC STACR REMIC Trust 4 845 12 145 due 1 25 34 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [9]
C000018685 [Member] | Connecticut Avenue Securities Trust 5 145 13 01 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [9]
C000018685 [Member] | U S Treasury Notes 3 875 4 125 due 4 30 31 2 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60% [9]
C000018685 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000018685 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.20%)
C000018685 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.60%
C000018685 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000018685 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
C000018685 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [10]
C000018685 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018685 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018685 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 33.90%
C000018689 [Member] | State of Hawaii 1 718 5 159 due 10 1 30 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40% [11]
C000018689 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 42 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [11]
C000018689 [Member] | State of California 5 10 7 60 due 9 1 35 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [11]
C000018689 [Member] | State of Illinois 3 45 7 35 due 6 15 29 12 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [11]
C000018689 [Member] | Commonwealth of Massachusetts 1 929 5 50 due 7 15 29 9 1 43 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [11]
C000018689 [Member] | State of Texas 1 844 5 157 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [11]
C000018689 [Member] | New York State Dormitory Authority 2 746 5 289 due 7 1 30 7 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [11]
C000018689 [Member] | Massachusetts Educational Financing Authority 5 95 6 166 due 7 1 44 7 1 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [11]
C000018689 [Member] | New York City Housing Development Corp 5 458 6 033 due 12 15 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [11]
C000018689 [Member] | New York City Transitional Finance Authority 1 97 5 65 due 11 1 30 11 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [11]
C000018689 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000018689 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [12]
C000018689 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000018689 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000018689 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 88.90%
C000018691 [Member] | State of Hawaii 1 718 5 159 due 10 1 30 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40% [13]
C000018691 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 42 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [13]
C000018691 [Member] | State of California 5 10 7 60 due 9 1 35 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [13]
C000018691 [Member] | State of Illinois 3 45 7 35 due 6 15 29 12 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [13]
C000018691 [Member] | Commonwealth of Massachusetts 1 929 5 50 due 7 15 29 9 1 43 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [13]
C000018691 [Member] | State of Texas 1 844 5 157 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [13]
C000018691 [Member] | New York State Dormitory Authority 2 746 5 289 due 7 1 30 7 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [13]
C000018691 [Member] | Massachusetts Educational Financing Authority 5 95 6 166 due 7 1 44 7 1 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [13]
C000018691 [Member] | New York City Housing Development Corp 5 458 6 033 due 12 15 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [13]
C000018691 [Member] | New York City Transitional Finance Authority 1 97 5 65 due 11 1 30 11 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [13]
C000018691 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000018691 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [14]
C000018691 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000018691 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000018691 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 88.90%
C000018692 [Member] | State of Hawaii 1 718 5 159 due 10 1 30 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40% [15]
C000018692 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 42 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [15]
C000018692 [Member] | State of California 5 10 7 60 due 9 1 35 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [15]
C000018692 [Member] | State of Illinois 3 45 7 35 due 6 15 29 12 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [15]
C000018692 [Member] | Commonwealth of Massachusetts 1 929 5 50 due 7 15 29 9 1 43 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [15]
C000018692 [Member] | State of Texas 1 844 5 157 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [15]
C000018692 [Member] | New York State Dormitory Authority 2 746 5 289 due 7 1 30 7 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [15]
C000018692 [Member] | Massachusetts Educational Financing Authority 5 95 6 166 due 7 1 44 7 1 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [15]
C000018692 [Member] | New York City Housing Development Corp 5 458 6 033 due 12 15 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [15]
C000018692 [Member] | New York City Transitional Finance Authority 1 97 5 65 due 11 1 30 11 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [15]
C000018692 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000018692 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [16]
C000018692 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000018692 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000018692 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 88.90%
C000185556 [Member] | State of Hawaii 1 718 5 159 due 10 1 30 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40% [17]
C000185556 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 42 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [17]
C000185556 [Member] | State of California 5 10 7 60 due 9 1 35 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [17]
C000185556 [Member] | State of Illinois 3 45 7 35 due 6 15 29 12 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [17]
C000185556 [Member] | Commonwealth of Massachusetts 1 929 5 50 due 7 15 29 9 1 43 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [17]
C000185556 [Member] | State of Texas 1 844 5 157 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [17]
C000185556 [Member] | New York State Dormitory Authority 2 746 5 289 due 7 1 30 7 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [17]
C000185556 [Member] | Massachusetts Educational Financing Authority 5 95 6 166 due 7 1 44 7 1 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [17]
C000185556 [Member] | New York City Housing Development Corp 5 458 6 033 due 12 15 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [17]
C000185556 [Member] | New York City Transitional Finance Authority 1 97 5 65 due 11 1 30 11 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [17]
C000185556 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000185556 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [18]
C000185556 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000185556 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000185556 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 88.90%
C000060791 [Member] | State of Hawaii 1 718 5 159 due 10 1 30 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40% [19]
C000060791 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 42 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [19]
C000060791 [Member] | State of California 5 10 7 60 due 9 1 35 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [19]
C000060791 [Member] | State of Illinois 3 45 7 35 due 6 15 29 12 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [19]
C000060791 [Member] | Commonwealth of Massachusetts 1 929 5 50 due 7 15 29 9 1 43 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [19]
C000060791 [Member] | State of Texas 1 844 5 157 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [19]
C000060791 [Member] | New York State Dormitory Authority 2 746 5 289 due 7 1 30 7 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [19]
C000060791 [Member] | Massachusetts Educational Financing Authority 5 95 6 166 due 7 1 44 7 1 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [19]
C000060791 [Member] | New York City Housing Development Corp 5 458 6 033 due 12 15 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [19]
C000060791 [Member] | New York City Transitional Finance Authority 1 97 5 65 due 11 1 30 11 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [19]
C000060791 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000060791 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [20]
C000060791 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000060791 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000060791 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 88.90%
C000221691 [Member] | Jane Street Group 6 125 7 125 due 4 30 31 5 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [21]
C000221691 [Member] | LifePoint Health Inc 5 375 10 00 due 1 15 29 5 1 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [21]
C000221691 [Member] | NRG Energy Inc 5 75 6 25 due 2 1 33 5 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [21]
C000221691 [Member] | IHO Verwaltungs GmbH 6 375 8 00 due 5 15 29 5 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [21]
C000221691 [Member] | Yum Brands Inc 3 625 5 375 due 1 15 30 4 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [21]
C000221691 [Member] | Churchill Downs Inc 4 75 6 75 due 4 1 27 5 1 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [21]
C000221691 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 1 15 30 3 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [21]
C000221691 [Member] | Talen Energy Supply LLC 6 125 6 50 due 5 17 30 2 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [21]
C000221691 [Member] | CCO Holdings LLC 4 25 5 375 due 5 1 27 1 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [21]
C000221691 [Member] | TransDigm Inc 4 625 7 125 due 8 15 28 1 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [21]
C000221691 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000221691 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000221691 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000221691 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 87.00%
C000221691 [Member] | Foreign Government Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [22]
C000221691 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000221691 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000221691 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000060792 [Member] | Jane Street Group 6 125 7 125 due 4 30 31 5 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [23]
C000060792 [Member] | LifePoint Health Inc 5 375 10 00 due 1 15 29 5 1 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [23]
C000060792 [Member] | NRG Energy Inc 5 75 6 25 due 2 1 33 5 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [23]
C000060792 [Member] | IHO Verwaltungs GmbH 6 375 8 00 due 5 15 29 5 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [23]
C000060792 [Member] | Yum Brands Inc 3 625 5 375 due 1 15 30 4 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [23]
C000060792 [Member] | Churchill Downs Inc 4 75 6 75 due 4 1 27 5 1 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [23]
C000060792 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 1 15 30 3 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [23]
C000060792 [Member] | Talen Energy Supply LLC 6 125 6 50 due 5 17 30 2 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [23]
C000060792 [Member] | CCO Holdings LLC 4 25 5 375 due 5 1 27 1 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [23]
C000060792 [Member] | TransDigm Inc 4 625 7 125 due 8 15 28 1 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [23]
C000060792 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000060792 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000060792 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000060792 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 87.00%
C000060792 [Member] | Foreign Government Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [24]
C000060792 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000060792 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000060792 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000127160 [Member] | Jane Street Group 6 125 7 125 due 4 30 31 5 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [25]
C000127160 [Member] | LifePoint Health Inc 5 375 10 00 due 1 15 29 5 1 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [25]
C000127160 [Member] | NRG Energy Inc 5 75 6 25 due 2 1 33 5 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [25]
C000127160 [Member] | IHO Verwaltungs GmbH 6 375 8 00 due 5 15 29 5 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [25]
C000127160 [Member] | Yum Brands Inc 3 625 5 375 due 1 15 30 4 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [25]
C000127160 [Member] | Churchill Downs Inc 4 75 6 75 due 4 1 27 5 1 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [25]
C000127160 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 1 15 30 3 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [25]
C000127160 [Member] | Talen Energy Supply LLC 6 125 6 50 due 5 17 30 2 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [25]
C000127160 [Member] | CCO Holdings LLC 4 25 5 375 due 5 1 27 1 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [25]
C000127160 [Member] | TransDigm Inc 4 625 7 125 due 8 15 28 1 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [25]
C000127160 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000127160 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000127160 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000127160 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 87.00%
C000127160 [Member] | Foreign Government Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [26]
C000127160 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000127160 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000127160 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000166835 [Member] | Jane Street Group 6 125 7 125 due 4 30 31 5 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [27]
C000166835 [Member] | LifePoint Health Inc 5 375 10 00 due 1 15 29 5 1 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [27]
C000166835 [Member] | NRG Energy Inc 5 75 6 25 due 2 1 33 5 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [27]
C000166835 [Member] | IHO Verwaltungs GmbH 6 375 8 00 due 5 15 29 5 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [27]
C000166835 [Member] | Yum Brands Inc 3 625 5 375 due 1 15 30 4 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [27]
C000166835 [Member] | Churchill Downs Inc 4 75 6 75 due 4 1 27 5 1 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [27]
C000166835 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 1 15 30 3 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [27]
C000166835 [Member] | Talen Energy Supply LLC 6 125 6 50 due 5 17 30 2 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [27]
C000166835 [Member] | CCO Holdings LLC 4 25 5 375 due 5 1 27 1 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [27]
C000166835 [Member] | TransDigm Inc 4 625 7 125 due 8 15 28 1 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [27]
C000166835 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000166835 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000166835 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000166835 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 87.00%
C000166835 [Member] | Foreign Government Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [28]
C000166835 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000166835 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000166835 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000057099 [Member] | Jane Street Group 6 125 7 125 due 4 30 31 5 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [29]
C000057099 [Member] | LifePoint Health Inc 5 375 10 00 due 1 15 29 5 1 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [29]
C000057099 [Member] | NRG Energy Inc 5 75 6 25 due 2 1 33 5 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [29]
C000057099 [Member] | IHO Verwaltungs GmbH 6 375 8 00 due 5 15 29 5 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [29]
C000057099 [Member] | Yum Brands Inc 3 625 5 375 due 1 15 30 4 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [29]
C000057099 [Member] | Churchill Downs Inc 4 75 6 75 due 4 1 27 5 1 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [29]
C000057099 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 1 15 30 3 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [29]
C000057099 [Member] | Talen Energy Supply LLC 6 125 6 50 due 5 17 30 2 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [29]
C000057099 [Member] | CCO Holdings LLC 4 25 5 375 due 5 1 27 1 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [29]
C000057099 [Member] | TransDigm Inc 4 625 7 125 due 8 15 28 1 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [29]
C000057099 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000057099 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000057099 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000057099 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 87.00%
C000057099 [Member] | Foreign Government Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [30]
C000057099 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000057099 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000057099 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018696 [Member] | Jane Street Group 6 125 7 125 due 4 30 31 5 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [31]
C000018696 [Member] | LifePoint Health Inc 5 375 10 00 due 1 15 29 5 1 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [31]
C000018696 [Member] | NRG Energy Inc 5 75 6 25 due 2 1 33 5 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [31]
C000018696 [Member] | IHO Verwaltungs GmbH 6 375 8 00 due 5 15 29 5 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [31]
C000018696 [Member] | Yum Brands Inc 3 625 5 375 due 1 15 30 4 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [31]
C000018696 [Member] | Churchill Downs Inc 4 75 6 75 due 4 1 27 5 1 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [31]
C000018696 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 1 15 30 3 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [31]
C000018696 [Member] | Talen Energy Supply LLC 6 125 6 50 due 5 17 30 2 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [31]
C000018696 [Member] | CCO Holdings LLC 4 25 5 375 due 5 1 27 1 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [31]
C000018696 [Member] | TransDigm Inc 4 625 7 125 due 8 15 28 1 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [31]
C000018696 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000018696 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000018696 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018696 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 87.00%
C000018696 [Member] | Foreign Government Bond [Member]  
Holdings [Line Items]  
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C000018696 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
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C000018696 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018696 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018695 [Member] | Jane Street Group 6 125 7 125 due 4 30 31 5 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [33]
C000018695 [Member] | LifePoint Health Inc 5 375 10 00 due 1 15 29 5 1 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [33]
C000018695 [Member] | NRG Energy Inc 5 75 6 25 due 2 1 33 5 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [33]
C000018695 [Member] | IHO Verwaltungs GmbH 6 375 8 00 due 5 15 29 5 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [33]
C000018695 [Member] | Yum Brands Inc 3 625 5 375 due 1 15 30 4 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [33]
C000018695 [Member] | Churchill Downs Inc 4 75 6 75 due 4 1 27 5 1 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [33]
C000018695 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 1 15 30 3 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [33]
C000018695 [Member] | Talen Energy Supply LLC 6 125 6 50 due 5 17 30 2 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [33]
C000018695 [Member] | CCO Holdings LLC 4 25 5 375 due 5 1 27 1 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [33]
C000018695 [Member] | TransDigm Inc 4 625 7 125 due 8 15 28 1 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [33]
C000018695 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
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C000018695 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000018695 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018695 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
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C000018695 [Member] | Foreign Government Bond [Member]  
Holdings [Line Items]  
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C000018695 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
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C000018695 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018695 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018693 [Member] | Jane Street Group 6 125 7 125 due 4 30 31 5 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [35]
C000018693 [Member] | LifePoint Health Inc 5 375 10 00 due 1 15 29 5 1 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [35]
C000018693 [Member] | NRG Energy Inc 5 75 6 25 due 2 1 33 5 15 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [35]
C000018693 [Member] | IHO Verwaltungs GmbH 6 375 8 00 due 5 15 29 5 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [35]
C000018693 [Member] | Yum Brands Inc 3 625 5 375 due 1 15 30 4 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [35]
C000018693 [Member] | Churchill Downs Inc 4 75 6 75 due 4 1 27 5 1 31 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [35]
C000018693 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 1 15 30 3 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [35]
C000018693 [Member] | Talen Energy Supply LLC 6 125 6 50 due 5 17 30 2 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [35]
C000018693 [Member] | CCO Holdings LLC 4 25 5 375 due 5 1 27 1 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [35]
C000018693 [Member] | TransDigm Inc 4 625 7 125 due 8 15 28 1 31 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [35]
C000018693 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000018693 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000018693 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018693 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 87.00%
C000018693 [Member] | Foreign Government Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [36]
C000018693 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018693 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018693 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018697 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.00%) [37]
C000018697 [Member] | Commercial Paper [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 40.60%
C000018697 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 30.40%
C000018697 [Member] | U S Treasury Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 29.00%
C000018699 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.00%) [38]
C000018699 [Member] | Commercial Paper [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 40.60%
C000018699 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 30.40%
C000018699 [Member] | U S Treasury Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 29.00%
C000060793 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.00%) [39]
C000060793 [Member] | Commercial Paper [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 40.60%
C000060793 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 30.40%
C000060793 [Member] | U S Treasury Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 29.00%
C000221692 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.00%) [40]
C000221692 [Member] | Commercial Paper [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 40.60%
C000221692 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 30.40%
C000221692 [Member] | U S Treasury Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 29.00%
C000060794 [Member] | Chicago Board of Education zero coupon 6 00 due 12 1 26 4 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [41]
C000060794 [Member] | Southeast Energy Authority A Cooperative District 4 00 5 25 due 11 1 35 1 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [41]
C000060794 [Member] | Main Street Natural Gas Inc 4 00 5 50 due 9 15 27 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [41]
C000060794 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 31 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [41]
C000060794 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 5 1 40 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [41]
C000060794 [Member] | Black Belt Energy Gas District 3 74 5 50 due 12 1 34 12 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [41]
C000060794 [Member] | Chicago O Hare International Airport 4 00 5 50 due 1 1 28 1 1 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [41]
C000060794 [Member] | Los Angeles Department of Water And Power 5 00 6 603 due 7 1 28 7 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [41]
C000060794 [Member] | California Community Choice Financing Authority 3 902 5 25 due 11 1 33 4 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [41]
C000060794 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 11 1 64 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [41]
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Holdings [Line Items]  
Percent of Net Asset Value 34.60%
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Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000060794 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000060794 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000060794 [Member] | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000060794 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000060794 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
C000060794 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000060794 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000060794 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000060794 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000185560 [Member] | Chicago Board of Education zero coupon 6 00 due 12 1 26 4 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [42]
C000185560 [Member] | Southeast Energy Authority A Cooperative District 4 00 5 25 due 11 1 35 1 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [42]
C000185560 [Member] | Main Street Natural Gas Inc 4 00 5 50 due 9 15 27 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [42]
C000185560 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 31 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [42]
C000185560 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 5 1 40 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [42]
C000185560 [Member] | Black Belt Energy Gas District 3 74 5 50 due 12 1 34 12 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [42]
C000185560 [Member] | Chicago O Hare International Airport 4 00 5 50 due 1 1 28 1 1 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [42]
C000185560 [Member] | Los Angeles Department of Water And Power 5 00 6 603 due 7 1 28 7 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [42]
C000185560 [Member] | California Community Choice Financing Authority 3 902 5 25 due 11 1 33 4 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [42]
C000185560 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 11 1 64 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [42]
C000185560 [Member] | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.60%
C000185560 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000185560 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000185560 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000185560 [Member] | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000185560 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000185560 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
C000185560 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000185560 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000185560 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000185560 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000082082 [Member] | Chicago Board of Education zero coupon 6 00 due 12 1 26 4 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [43]
C000082082 [Member] | Southeast Energy Authority A Cooperative District 4 00 5 25 due 11 1 35 1 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [43]
C000082082 [Member] | Main Street Natural Gas Inc 4 00 5 50 due 9 15 27 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [43]
C000082082 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 31 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [43]
C000082082 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 5 1 40 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [43]
C000082082 [Member] | Black Belt Energy Gas District 3 74 5 50 due 12 1 34 12 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [43]
C000082082 [Member] | Chicago O Hare International Airport 4 00 5 50 due 1 1 28 1 1 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [43]
C000082082 [Member] | Los Angeles Department of Water And Power 5 00 6 603 due 7 1 28 7 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [43]
C000082082 [Member] | California Community Choice Financing Authority 3 902 5 25 due 11 1 33 4 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [43]
C000082082 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 11 1 64 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [43]
C000082082 [Member] | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.60%
C000082082 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000082082 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000082082 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000082082 [Member] | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000082082 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000082082 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
C000082082 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000082082 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000082082 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000082082 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000221693 [Member] | Chicago Board of Education zero coupon 6 00 due 12 1 26 4 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [44]
C000221693 [Member] | Southeast Energy Authority A Cooperative District 4 00 5 25 due 11 1 35 1 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [44]
C000221693 [Member] | Main Street Natural Gas Inc 4 00 5 50 due 9 15 27 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [44]
C000221693 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 31 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [44]
C000221693 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 5 1 40 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [44]
C000221693 [Member] | Black Belt Energy Gas District 3 74 5 50 due 12 1 34 12 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [44]
C000221693 [Member] | Chicago O Hare International Airport 4 00 5 50 due 1 1 28 1 1 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [44]
C000221693 [Member] | Los Angeles Department of Water And Power 5 00 6 603 due 7 1 28 7 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [44]
C000221693 [Member] | California Community Choice Financing Authority 3 902 5 25 due 11 1 33 4 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [44]
C000221693 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 11 1 64 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [44]
C000221693 [Member] | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.60%
C000221693 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000221693 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000221693 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000221693 [Member] | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000221693 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000221693 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
C000221693 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000221693 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000221693 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000221693 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000018702 [Member] | Chicago Board of Education zero coupon 6 00 due 12 1 26 4 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [45]
C000018702 [Member] | Southeast Energy Authority A Cooperative District 4 00 5 25 due 11 1 35 1 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [45]
C000018702 [Member] | Main Street Natural Gas Inc 4 00 5 50 due 9 15 27 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [45]
C000018702 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 31 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [45]
C000018702 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 5 1 40 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [45]
C000018702 [Member] | Black Belt Energy Gas District 3 74 5 50 due 12 1 34 12 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [45]
C000018702 [Member] | Chicago O Hare International Airport 4 00 5 50 due 1 1 28 1 1 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [45]
C000018702 [Member] | Los Angeles Department of Water And Power 5 00 6 603 due 7 1 28 7 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [45]
C000018702 [Member] | California Community Choice Financing Authority 3 902 5 25 due 11 1 33 4 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [45]
C000018702 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 11 1 64 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [45]
C000018702 [Member] | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.60%
C000018702 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000018702 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000018702 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000018702 [Member] | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018702 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000018702 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
C000018702 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018702 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000018702 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000018702 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000018700 [Member] | Chicago Board of Education zero coupon 6 00 due 12 1 26 4 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [46]
C000018700 [Member] | Southeast Energy Authority A Cooperative District 4 00 5 25 due 11 1 35 1 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [46]
C000018700 [Member] | Main Street Natural Gas Inc 4 00 5 50 due 9 15 27 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [46]
C000018700 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 31 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [46]
C000018700 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 5 1 40 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [46]
C000018700 [Member] | Black Belt Energy Gas District 3 74 5 50 due 12 1 34 12 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [46]
C000018700 [Member] | Chicago O Hare International Airport 4 00 5 50 due 1 1 28 1 1 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [46]
C000018700 [Member] | Los Angeles Department of Water And Power 5 00 6 603 due 7 1 28 7 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [46]
C000018700 [Member] | California Community Choice Financing Authority 3 902 5 25 due 11 1 33 4 1 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [46]
C000018700 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 11 1 64 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [46]
C000018700 [Member] | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.60%
C000018700 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000018700 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000018700 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000018700 [Member] | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018700 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000018700 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
C000018700 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018700 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000018700 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000018700 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000018703 [Member] | Lumentum Holdings Inc 0 50 due 6 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [47]
C000018703 [Member] | Western Digital Corp 3 00 due 11 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [47]
C000018703 [Member] | Advanced Energy Industries Inc 2 50 due 9 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [47]
C000018703 [Member] | Welltower OP LLC 3 125 due 7 15 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [47]
C000018703 [Member] | Mirum Pharmaceuticals Inc 4 00 due 5 1 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [47]
C000018703 [Member] | ON Semiconductor Corp zero coupon due 5 1 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [47]
C000018703 [Member] | Planet Labs PBC 0 50 due 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [47]
C000018703 [Member] | MKS Inc 1 25 due 6 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [47]
C000018703 [Member] | Lantheus Holdings Inc 2 625 due 12 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [47]
C000018703 [Member] | QXO Inc 5 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [47]
C000018703 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (3.00%)
C000018703 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000018703 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 84.60%
C000018703 [Member] | Convertible Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000018705 [Member] | Lumentum Holdings Inc 0 50 due 6 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [48]
C000018705 [Member] | Western Digital Corp 3 00 due 11 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [48]
C000018705 [Member] | Advanced Energy Industries Inc 2 50 due 9 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [48]
C000018705 [Member] | Welltower OP LLC 3 125 due 7 15 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [48]
C000018705 [Member] | Mirum Pharmaceuticals Inc 4 00 due 5 1 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [48]
C000018705 [Member] | ON Semiconductor Corp zero coupon due 5 1 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [48]
C000018705 [Member] | Planet Labs PBC 0 50 due 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [48]
C000018705 [Member] | MKS Inc 1 25 due 6 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [48]
C000018705 [Member] | Lantheus Holdings Inc 2 625 due 12 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [48]
C000018705 [Member] | QXO Inc 5 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [48]
C000018705 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (3.00%)
C000018705 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000018705 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 84.60%
C000018705 [Member] | Convertible Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000087595 [Member] | Lumentum Holdings Inc 0 50 due 6 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [49]
C000087595 [Member] | Western Digital Corp 3 00 due 11 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [49]
C000087595 [Member] | Advanced Energy Industries Inc 2 50 due 9 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [49]
C000087595 [Member] | Welltower OP LLC 3 125 due 7 15 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [49]
C000087595 [Member] | Mirum Pharmaceuticals Inc 4 00 due 5 1 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [49]
C000087595 [Member] | ON Semiconductor Corp zero coupon due 5 1 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [49]
C000087595 [Member] | Planet Labs PBC 0 50 due 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [49]
C000087595 [Member] | MKS Inc 1 25 due 6 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [49]
C000087595 [Member] | Lantheus Holdings Inc 2 625 due 12 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [49]
C000087595 [Member] | QXO Inc 5 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [49]
C000087595 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (3.00%)
C000087595 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000087595 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 84.60%
C000087595 [Member] | Convertible Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000060795 [Member] | Lumentum Holdings Inc 0 50 due 6 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [50]
C000060795 [Member] | Western Digital Corp 3 00 due 11 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [50]
C000060795 [Member] | Advanced Energy Industries Inc 2 50 due 9 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [50]
C000060795 [Member] | Welltower OP LLC 3 125 due 7 15 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [50]
C000060795 [Member] | Mirum Pharmaceuticals Inc 4 00 due 5 1 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [50]
C000060795 [Member] | ON Semiconductor Corp zero coupon due 5 1 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [50]
C000060795 [Member] | Planet Labs PBC 0 50 due 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [50]
C000060795 [Member] | MKS Inc 1 25 due 6 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [50]
C000060795 [Member] | Lantheus Holdings Inc 2 625 due 12 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [50]
C000060795 [Member] | QXO Inc 5 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [50]
C000060795 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (3.00%)
C000060795 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000060795 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 84.60%
C000060795 [Member] | Convertible Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000221696 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [51]
C000221696 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [51]
C000221696 [Member] | Texas Instruments Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [51]
C000221696 [Member] | Analog Devices Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [51]
C000221696 [Member] | Hewlett Packard Enterprise Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [51]
C000221696 [Member] | Dell Technologies Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [51]
C000221696 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [51]
C000221696 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [51]
C000221696 [Member] | UMBS 30 Year 2 00 6 00 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [51]
C000221696 [Member] | GNMA zero coupon 7 881 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [51]
C000221696 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000221696 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000221696 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000221696 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000221696 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000221696 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 64.70%
C000221696 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000221696 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000221696 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000060796 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [52]
C000060796 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [52]
C000060796 [Member] | Texas Instruments Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [52]
C000060796 [Member] | Analog Devices Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [52]
C000060796 [Member] | Hewlett Packard Enterprise Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [52]
C000060796 [Member] | Dell Technologies Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [52]
C000060796 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [52]
C000060796 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [52]
C000060796 [Member] | UMBS 30 Year 2 00 6 00 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [52]
C000060796 [Member] | GNMA zero coupon 7 881 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [52]
C000060796 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000060796 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000060796 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000060796 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000060796 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000060796 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 64.70%
C000060796 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000060796 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000060796 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000185564 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [53]
C000185564 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [53]
C000185564 [Member] | Texas Instruments Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [53]
C000185564 [Member] | Analog Devices Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [53]
C000185564 [Member] | Hewlett Packard Enterprise Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [53]
C000185564 [Member] | Dell Technologies Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [53]
C000185564 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [53]
C000185564 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [53]
C000185564 [Member] | UMBS 30 Year 2 00 6 00 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [53]
C000185564 [Member] | GNMA zero coupon 7 881 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [53]
C000185564 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000185564 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000185564 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000185564 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000185564 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000185564 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 64.70%
C000185564 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000185564 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000185564 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000018709 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [54]
C000018709 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [54]
C000018709 [Member] | Texas Instruments Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [54]
C000018709 [Member] | Analog Devices Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [54]
C000018709 [Member] | Hewlett Packard Enterprise Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [54]
C000018709 [Member] | Dell Technologies Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [54]
C000018709 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [54]
C000018709 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [54]
C000018709 [Member] | UMBS 30 Year 2 00 6 00 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [54]
C000018709 [Member] | GNMA zero coupon 7 881 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [54]
C000018709 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000018709 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000018709 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000018709 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000018709 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000018709 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 64.70%
C000018709 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000018709 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000018709 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000018708 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [55]
C000018708 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [55]
C000018708 [Member] | Texas Instruments Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [55]
C000018708 [Member] | Analog Devices Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [55]
C000018708 [Member] | Hewlett Packard Enterprise Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [55]
C000018708 [Member] | Dell Technologies Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [55]
C000018708 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [55]
C000018708 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [55]
C000018708 [Member] | UMBS 30 Year 2 00 6 00 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [55]
C000018708 [Member] | GNMA zero coupon 7 881 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [55]
C000018708 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000018708 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000018708 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000018708 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000018708 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000018708 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 64.70%
C000018708 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000018708 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000018708 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000018706 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [56]
C000018706 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [56]
C000018706 [Member] | Texas Instruments Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [56]
C000018706 [Member] | Analog Devices Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [56]
C000018706 [Member] | Hewlett Packard Enterprise Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [56]
C000018706 [Member] | Dell Technologies Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [56]
C000018706 [Member] | Taiwan Semiconductor Manufacturing Co Ltd [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [56]
C000018706 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [56]
C000018706 [Member] | UMBS 30 Year 2 00 6 00 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [56]
C000018706 [Member] | GNMA zero coupon 7 881 due 7 20 44 3 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [56]
C000018706 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000018706 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000018706 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000018706 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000018706 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000018706 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 64.70%
C000018706 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000018706 [Member] | Loan Participations and Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000018706 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000018710 [Member] | Hungary Government Bond 4 875 7 625 due 3 26 36 3 29 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [57]
C000018710 [Member] | Dominican Republic Government Bond 4 875 7 05 due 2 3 31 1 21 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50% [57]
C000018710 [Member] | Argentina Government Bond 0 75 4 125 due 7 9 30 7 9 46 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [57]
C000018710 [Member] | Romanian Government Bond 5 125 7 125 due 9 16 30 7 11 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [57]
C000018710 [Member] | Egypt Government Bond 6 588 8 70 due 2 21 28 2 16 61 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [57]
C000018710 [Member] | Mexico Government Bond 3 75 6 625 due 5 7 36 4 19 71 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [57]
C000018710 [Member] | Nigeria Government Bond 6 125 10 375 due 9 28 28 9 28 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [57]
C000018710 [Member] | Turkey Government Bond 5 75 9 875 due 1 15 28 5 11 47 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [57]
C000018710 [Member] | Chile Government Bond 2 55 5 65 due 7 27 33 9 21 71 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [57]
C000018710 [Member] | Ecuador Government Bond 6 90 9 25 due 7 31 30 1 29 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [57]
C000018710 [Member] | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 59.70%
C000018710 [Member] | ARGENTINA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000018710 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018710 [Member] | CHILE  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018710 [Member] | DOMINICAN REPUBLIC  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000018710 [Member] | EGYPT  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000018710 [Member] | HUNGARY  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018710 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000018710 [Member] | NIGERIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000018710 [Member] | ROMANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000018710 [Member] | TÜRKIYE  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018712 [Member] | Hungary Government Bond 4 875 7 625 due 3 26 36 3 29 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [58]
C000018712 [Member] | Dominican Republic Government Bond 4 875 7 05 due 2 3 31 1 21 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50% [58]
C000018712 [Member] | Argentina Government Bond 0 75 4 125 due 7 9 30 7 9 46 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [58]
C000018712 [Member] | Romanian Government Bond 5 125 7 125 due 9 16 30 7 11 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [58]
C000018712 [Member] | Egypt Government Bond 6 588 8 70 due 2 21 28 2 16 61 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [58]
C000018712 [Member] | Mexico Government Bond 3 75 6 625 due 5 7 36 4 19 71 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [58]
C000018712 [Member] | Nigeria Government Bond 6 125 10 375 due 9 28 28 9 28 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [58]
C000018712 [Member] | Turkey Government Bond 5 75 9 875 due 1 15 28 5 11 47 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [58]
C000018712 [Member] | Chile Government Bond 2 55 5 65 due 7 27 33 9 21 71 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [58]
C000018712 [Member] | Ecuador Government Bond 6 90 9 25 due 7 31 30 1 29 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [58]
C000018712 [Member] | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 59.70%
C000018712 [Member] | ARGENTINA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000018712 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018712 [Member] | CHILE  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018712 [Member] | DOMINICAN REPUBLIC  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000018712 [Member] | EGYPT  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000018712 [Member] | HUNGARY  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018712 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000018712 [Member] | NIGERIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000018712 [Member] | ROMANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000018712 [Member] | TÜRKIYE  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000052120 [Member] | Hungary Government Bond 4 875 7 625 due 3 26 36 3 29 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [59]
C000052120 [Member] | Dominican Republic Government Bond 4 875 7 05 due 2 3 31 1 21 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50% [59]
C000052120 [Member] | Argentina Government Bond 0 75 4 125 due 7 9 30 7 9 46 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [59]
C000052120 [Member] | Romanian Government Bond 5 125 7 125 due 9 16 30 7 11 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [59]
C000052120 [Member] | Egypt Government Bond 6 588 8 70 due 2 21 28 2 16 61 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [59]
C000052120 [Member] | Mexico Government Bond 3 75 6 625 due 5 7 36 4 19 71 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [59]
C000052120 [Member] | Nigeria Government Bond 6 125 10 375 due 9 28 28 9 28 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [59]
C000052120 [Member] | Turkey Government Bond 5 75 9 875 due 1 15 28 5 11 47 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [59]
C000052120 [Member] | Chile Government Bond 2 55 5 65 due 7 27 33 9 21 71 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [59]
C000052120 [Member] | Ecuador Government Bond 6 90 9 25 due 7 31 30 1 29 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [59]
C000052120 [Member] | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 59.70%
C000052120 [Member] | ARGENTINA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000052120 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000052120 [Member] | CHILE  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000052120 [Member] | DOMINICAN REPUBLIC  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000052120 [Member] | EGYPT  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000052120 [Member] | HUNGARY  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000052120 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000052120 [Member] | NIGERIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000052120 [Member] | ROMANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000052120 [Member] | TÜRKIYE  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000060797 [Member] | Hungary Government Bond 4 875 7 625 due 3 26 36 3 29 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [60]
C000060797 [Member] | Dominican Republic Government Bond 4 875 7 05 due 2 3 31 1 21 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50% [60]
C000060797 [Member] | Argentina Government Bond 0 75 4 125 due 7 9 30 7 9 46 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [60]
C000060797 [Member] | Romanian Government Bond 5 125 7 125 due 9 16 30 7 11 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [60]
C000060797 [Member] | Egypt Government Bond 6 588 8 70 due 2 21 28 2 16 61 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [60]
C000060797 [Member] | Mexico Government Bond 3 75 6 625 due 5 7 36 4 19 71 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [60]
C000060797 [Member] | Nigeria Government Bond 6 125 10 375 due 9 28 28 9 28 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [60]
C000060797 [Member] | Turkey Government Bond 5 75 9 875 due 1 15 28 5 11 47 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [60]
C000060797 [Member] | Chile Government Bond 2 55 5 65 due 7 27 33 9 21 71 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [60]
C000060797 [Member] | Ecuador Government Bond 6 90 9 25 due 7 31 30 1 29 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [60]
C000060797 [Member] | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 59.70%
C000060797 [Member] | ARGENTINA  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000060797 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000060797 [Member] | CHILE  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000060797 [Member] | DOMINICAN REPUBLIC  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000060797 [Member] | EGYPT  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000060797 [Member] | HUNGARY  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000060797 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000060797 [Member] | NIGERIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000060797 [Member] | ROMANIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000060797 [Member] | TÜRKIYE  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000060799 [Member] | Expeditors International of Washington Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [61]
C000060799 [Member] | Old Dominion Freight Line Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [61]
C000060799 [Member] | Credit Acceptance Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60% [61]
C000060799 [Member] | Amphenol Corp Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [61]
C000060799 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [61]
C000060799 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [61]
C000060799 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [61]
C000060799 [Member] | M And T Bank Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10% [61]
C000060799 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [61]
C000060799 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [61]
C000060799 [Member] | Ground Transportation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000060799 [Member] | Consumer Finance [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000060799 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000060799 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000060799 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000060799 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.90%
C000060799 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000060799 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
C000060799 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.00%
C000060799 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000060799 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000179143 [Member] | Expeditors International of Washington Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [62]
C000179143 [Member] | Old Dominion Freight Line Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [62]
C000179143 [Member] | Credit Acceptance Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60% [62]
C000179143 [Member] | Amphenol Corp Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [62]
C000179143 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [62]
C000179143 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [62]
C000179143 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [62]
C000179143 [Member] | M And T Bank Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10% [62]
C000179143 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [62]
C000179143 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [62]
C000179143 [Member] | Ground Transportation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000179143 [Member] | Consumer Finance [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000179143 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000179143 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000179143 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000179143 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.90%
C000179143 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000179143 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
C000179143 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.00%
C000179143 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000179143 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000018722 [Member] | Expeditors International of Washington Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [63]
C000018722 [Member] | Old Dominion Freight Line Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [63]
C000018722 [Member] | Credit Acceptance Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60% [63]
C000018722 [Member] | Amphenol Corp Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [63]
C000018722 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [63]
C000018722 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [63]
C000018722 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [63]
C000018722 [Member] | M And T Bank Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10% [63]
C000018722 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [63]
C000018722 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [63]
C000018722 [Member] | Ground Transportation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000018722 [Member] | Consumer Finance [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000018722 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000018722 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000018722 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018722 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.90%
C000018722 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000018722 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
C000018722 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.00%
C000018722 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000018722 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000018721 [Member] | Expeditors International of Washington Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [64]
C000018721 [Member] | Old Dominion Freight Line Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [64]
C000018721 [Member] | Credit Acceptance Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60% [64]
C000018721 [Member] | Amphenol Corp Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [64]
C000018721 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [64]
C000018721 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [64]
C000018721 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [64]
C000018721 [Member] | M And T Bank Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10% [64]
C000018721 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [64]
C000018721 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [64]
C000018721 [Member] | Ground Transportation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000018721 [Member] | Consumer Finance [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000018721 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000018721 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000018721 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018721 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.90%
C000018721 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000018721 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
C000018721 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.00%
C000018721 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000018721 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000018719 [Member] | Expeditors International of Washington Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [65]
C000018719 [Member] | Old Dominion Freight Line Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [65]
C000018719 [Member] | Credit Acceptance Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60% [65]
C000018719 [Member] | Amphenol Corp Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [65]
C000018719 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [65]
C000018719 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [65]
C000018719 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [65]
C000018719 [Member] | M And T Bank Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10% [65]
C000018719 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [65]
C000018719 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [65]
C000018719 [Member] | Ground Transportation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000018719 [Member] | Consumer Finance [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000018719 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000018719 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000018719 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018719 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.90%
C000018719 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000018719 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
C000018719 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.00%
C000018719 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000018719 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000018724 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [66]
C000018724 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [66]
C000018724 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.60% [66]
C000018724 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70% [66]
C000018724 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10% [66]
C000018724 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [66]
C000018724 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [66]
C000018724 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [66]
C000018724 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [66]
C000018724 [Member] | GE Aerospace [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [66]
C000018724 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000018724 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000018724 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018724 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000018724 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000018724 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000018724 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000018724 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000018724 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018724 [Member] | Electrical Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018724 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000018726 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [67]
C000018726 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [67]
C000018726 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.60% [67]
C000018726 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70% [67]
C000018726 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10% [67]
C000018726 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [67]
C000018726 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [67]
C000018726 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [67]
C000018726 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [67]
C000018726 [Member] | GE Aerospace [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [67]
C000018726 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000018726 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000018726 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018726 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000018726 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000018726 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000018726 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000018726 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000018726 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018726 [Member] | Electrical Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018726 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000018727 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [68]
C000018727 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [68]
C000018727 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.60% [68]
C000018727 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70% [68]
C000018727 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10% [68]
C000018727 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [68]
C000018727 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [68]
C000018727 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [68]
C000018727 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [68]
C000018727 [Member] | GE Aerospace [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [68]
C000018727 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000018727 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000018727 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018727 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000018727 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000018727 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000018727 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000018727 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000018727 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018727 [Member] | Electrical Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018727 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000018728 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [69]
C000018728 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [69]
C000018728 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.60% [69]
C000018728 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70% [69]
C000018728 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10% [69]
C000018728 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [69]
C000018728 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [69]
C000018728 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [69]
C000018728 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [69]
C000018728 [Member] | GE Aerospace [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [69]
C000018728 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000018728 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000018728 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018728 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000018728 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000018728 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000018728 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000018728 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000018728 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018728 [Member] | Electrical Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018728 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000018729 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [70]
C000018729 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [70]
C000018729 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.60% [70]
C000018729 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70% [70]
C000018729 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10% [70]
C000018729 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [70]
C000018729 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [70]
C000018729 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [70]
C000018729 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [70]
C000018729 [Member] | GE Aerospace [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [70]
C000018729 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000018729 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000018729 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018729 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000018729 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000018729 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000018729 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000018729 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000018729 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018729 [Member] | Electrical Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018729 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000030958 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [71]
C000030958 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [71]
C000030958 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.60% [71]
C000030958 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70% [71]
C000030958 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10% [71]
C000030958 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [71]
C000030958 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [71]
C000030958 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [71]
C000030958 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [71]
C000030958 [Member] | GE Aerospace [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [71]
C000030958 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000030958 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000030958 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000030958 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000030958 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000030958 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000030958 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000030958 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000030958 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000030958 [Member] | Electrical Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000030958 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000127162 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [72]
C000127162 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [72]
C000127162 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.60% [72]
C000127162 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70% [72]
C000127162 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10% [72]
C000127162 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [72]
C000127162 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [72]
C000127162 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [72]
C000127162 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [72]
C000127162 [Member] | GE Aerospace [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [72]
C000127162 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000127162 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000127162 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000127162 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000127162 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000127162 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000127162 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000127162 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000127162 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000127162 [Member] | Electrical Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000127162 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000060800 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [73]
C000060800 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [73]
C000060800 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.60% [73]
C000060800 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70% [73]
C000060800 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10% [73]
C000060800 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [73]
C000060800 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [73]
C000060800 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [73]
C000060800 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [73]
C000060800 [Member] | GE Aerospace [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [73]
C000060800 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000060800 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000060800 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000060800 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000060800 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000060800 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000060800 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000060800 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000060800 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000060800 [Member] | Electrical Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000060800 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000221700 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [74]
C000221700 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [74]
C000221700 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.60% [74]
C000221700 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70% [74]
C000221700 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10% [74]
C000221700 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [74]
C000221700 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [74]
C000221700 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [74]
C000221700 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [74]
C000221700 [Member] | GE Aerospace [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [74]
C000221700 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000221700 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000221700 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000221700 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.80%
C000221700 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000221700 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000221700 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000221700 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000221700 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000221700 [Member] | Electrical Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000221700 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000060801 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [75]
C000060801 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50% [75]
C000060801 [Member] | Diamondback Energy Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [75]
C000060801 [Member] | Sempra [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [75]
C000060801 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [75]
C000060801 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [75]
C000060801 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [75]
C000060801 [Member] | Merck And Co Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [75]
C000060801 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60% [75]
C000060801 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [75]
C000060801 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000060801 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
C000060801 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000060801 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000060801 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000060801 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000060801 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000060801 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000060801 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000060801 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000060801 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000185571 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [76]
C000185571 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50% [76]
C000185571 [Member] | Diamondback Energy Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [76]
C000185571 [Member] | Sempra [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [76]
C000185571 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [76]
C000185571 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [76]
C000185571 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [76]
C000185571 [Member] | Merck And Co Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [76]
C000185571 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60% [76]
C000185571 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [76]
C000185571 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000185571 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
C000185571 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000185571 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000185571 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000185571 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000185571 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000185571 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000185571 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000185571 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000185571 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000018733 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [77]
C000018733 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50% [77]
C000018733 [Member] | Diamondback Energy Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [77]
C000018733 [Member] | Sempra [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [77]
C000018733 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [77]
C000018733 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [77]
C000018733 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [77]
C000018733 [Member] | Merck And Co Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [77]
C000018733 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60% [77]
C000018733 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [77]
C000018733 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000018733 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
C000018733 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000018733 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000018733 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000018733 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000018733 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018733 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000018733 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000018733 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000018733 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000018732 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [78]
C000018732 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50% [78]
C000018732 [Member] | Diamondback Energy Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [78]
C000018732 [Member] | Sempra [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [78]
C000018732 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [78]
C000018732 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [78]
C000018732 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [78]
C000018732 [Member] | Merck And Co Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [78]
C000018732 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60% [78]
C000018732 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [78]
C000018732 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000018732 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
C000018732 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000018732 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000018732 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000018732 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000018732 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018732 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000018732 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000018732 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000018732 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000018730 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [79]
C000018730 [Member] | Alphabet Inc Class C [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50% [79]
C000018730 [Member] | Diamondback Energy Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70% [79]
C000018730 [Member] | Sempra [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [79]
C000018730 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [79]
C000018730 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [79]
C000018730 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [79]
C000018730 [Member] | Merck And Co Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [79]
C000018730 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60% [79]
C000018730 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60% [79]
C000018730 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000018730 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
C000018730 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000018730 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000018730 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000018730 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000018730 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018730 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000018730 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000018730 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000018730 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
[1] Excluding short-term investments
[2] Less than one-tenth of a percent.
[3] Excluding short-term investments
[4] Less than one-tenth of a percent.
[5] Excluding short-term investments
[6] Less than one-tenth of a percent.
[7] Excluding short-term investments
[8] Less than one-tenth of a percent.
[9] Excluding short-term investments
[10] Less than one-tenth of a percent.
[11] Excluding short-term investments
[12] Less than one-tenth of a percent.
[13] Excluding short-term investments
[14] Less than one-tenth of a percent.
[15] Excluding short-term investments
[16] Less than one-tenth of a percent.
[17] Excluding short-term investments
[18] Less than one-tenth of a percent.
[19] Excluding short-term investments
[20] Less than one-tenth of a percent.
[21] Excluding short-term investments
[22] Less than one-tenth of a percent.
[23] Excluding short-term investments
[24] Less than one-tenth of a percent.
[25] Excluding short-term investments
[26] Less than one-tenth of a percent.
[27] Excluding short-term investments
[28] Less than one-tenth of a percent.
[29] Excluding short-term investments
[30] Less than one-tenth of a percent.
[31] Excluding short-term investments
[32] Less than one-tenth of a percent.
[33] Excluding short-term investments
[34] Less than one-tenth of a percent.
[35] Excluding short-term investments
[36] Less than one-tenth of a percent.
[37] Less than one-tenth of a percent.
[38] Less than one-tenth of a percent.
[39] Less than one-tenth of a percent.
[40] Less than one-tenth of a percent.
[41] Excluding short-term investments
[42] Excluding short-term investments
[43] Excluding short-term investments
[44] Excluding short-term investments
[45] Excluding short-term investments
[46] Excluding short-term investments
[47] Excluding short-term investments
[48] Excluding short-term investments
[49] Excluding short-term investments
[50] Excluding short-term investments
[51] Excluding short-term investments
[52] Excluding short-term investments
[53] Excluding short-term investments
[54] Excluding short-term investments
[55] Excluding short-term investments
[56] Excluding short-term investments
[57] Excluding short-term investments
[58] Excluding short-term investments
[59] Excluding short-term investments
[60] Excluding short-term investments
[61] Excluding short-term investments
[62] Excluding short-term investments
[63] Excluding short-term investments
[64] Excluding short-term investments
[65] Excluding short-term investments
[66] Excluding short-term investments
[67] Excluding short-term investments
[68] Excluding short-term investments
[69] Excluding short-term investments
[70] Excluding short-term investments
[71] Excluding short-term investments
[72] Excluding short-term investments
[73] Excluding short-term investments
[74] Excluding short-term investments
[75] Excluding short-term investments
[76] Excluding short-term investments
[77] Excluding short-term investments
[78] Excluding short-term investments
[79] Excluding short-term investments