v3.25.2
Shareholder Report, Holdings (Details)
Apr. 30, 2025
C000018685 [Member] | U S Treasury Notes 3 75 4 625 due 4 30 27 2 15 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 22.30% [1]
C000018685 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 9 25 31 1 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [1]
C000018685 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 8 25 33 1 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [1]
C000018685 [Member] | GNMA zero coupon 4 50 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [1]
C000018685 [Member] | UMBS 30 Year 2 00 5 50 due 3 1 52 5 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [1]
C000018685 [Member] | Flagship Credit Auto Trust 1 59 6 30 due 3 16 26 4 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [1]
C000018685 [Member] | FHLMC zero coupon 9 304 due 5 25 44 8 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [1]
C000018685 [Member] | Exeter Automobile Receivables Trust 3 04 10 45 due 12 15 28 9 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [1]
C000018685 [Member] | Wells Fargo Commercial Mortgage Trust 2 70 5 122 due 12 15 39 1 15 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [1]
C000018685 [Member] | CF Hippolyta Issuer LLC 1 69 2 60 due 7 15 60 3 15 61 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [1]
C000018685 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 28.80%
C000018685 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.90%
C000018685 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
C000018685 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000018685 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000018685 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000018685 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000018685 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
C000018685 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.30%)
C000018687 [Member] | U S Treasury Notes 3 75 4 625 due 4 30 27 2 15 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 22.30% [3]
C000018687 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 9 25 31 1 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [3]
C000018687 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 8 25 33 1 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [3]
C000018687 [Member] | GNMA zero coupon 4 50 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [3]
C000018687 [Member] | UMBS 30 Year 2 00 5 50 due 3 1 52 5 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [3]
C000018687 [Member] | Flagship Credit Auto Trust 1 59 6 30 due 3 16 26 4 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [3]
C000018687 [Member] | FHLMC zero coupon 9 304 due 5 25 44 8 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [3]
C000018687 [Member] | Exeter Automobile Receivables Trust 3 04 10 45 due 12 15 28 9 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [3]
C000018687 [Member] | Wells Fargo Commercial Mortgage Trust 2 70 5 122 due 12 15 39 1 15 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [3]
C000018687 [Member] | CF Hippolyta Issuer LLC 1 69 2 60 due 7 15 60 3 15 61 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [3]
C000018687 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 28.80%
C000018687 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.90%
C000018687 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
C000018687 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000018687 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000018687 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000018687 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000018687 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [4]
C000018687 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.30%)
C000018688 [Member] | U S Treasury Notes 3 75 4 625 due 4 30 27 2 15 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 22.30% [5]
C000018688 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 9 25 31 1 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [5]
C000018688 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 8 25 33 1 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [5]
C000018688 [Member] | GNMA zero coupon 4 50 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [5]
C000018688 [Member] | UMBS 30 Year 2 00 5 50 due 3 1 52 5 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [5]
C000018688 [Member] | Flagship Credit Auto Trust 1 59 6 30 due 3 16 26 4 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [5]
C000018688 [Member] | FHLMC zero coupon 9 304 due 5 25 44 8 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [5]
C000018688 [Member] | Exeter Automobile Receivables Trust 3 04 10 45 due 12 15 28 9 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [5]
C000018688 [Member] | Wells Fargo Commercial Mortgage Trust 2 70 5 122 due 12 15 39 1 15 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [5]
C000018688 [Member] | CF Hippolyta Issuer LLC 1 69 2 60 due 7 15 60 3 15 61 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [5]
C000018688 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 28.80%
C000018688 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.90%
C000018688 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
C000018688 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000018688 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000018688 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000018688 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000018688 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [6]
C000018688 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.30%)
C000185554 [Member] | U S Treasury Notes 3 75 4 625 due 4 30 27 2 15 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 22.30% [7]
C000185554 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 9 25 31 1 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [7]
C000185554 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 8 25 33 1 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [7]
C000185554 [Member] | GNMA zero coupon 4 50 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [7]
C000185554 [Member] | UMBS 30 Year 2 00 5 50 due 3 1 52 5 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [7]
C000185554 [Member] | Flagship Credit Auto Trust 1 59 6 30 due 3 16 26 4 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [7]
C000185554 [Member] | FHLMC zero coupon 9 304 due 5 25 44 8 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [7]
C000185554 [Member] | Exeter Automobile Receivables Trust 3 04 10 45 due 12 15 28 9 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [7]
C000185554 [Member] | Wells Fargo Commercial Mortgage Trust 2 70 5 122 due 12 15 39 1 15 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [7]
C000185554 [Member] | CF Hippolyta Issuer LLC 1 69 2 60 due 7 15 60 3 15 61 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [7]
C000185554 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 28.80%
C000185554 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.90%
C000185554 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
C000185554 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000185554 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000185554 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000185554 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000185554 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [8]
C000185554 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.30%)
C000060790 [Member] | U S Treasury Notes 3 75 4 625 due 4 30 27 2 15 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 22.30% [9]
C000060790 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 9 25 31 1 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [9]
C000060790 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 8 25 33 1 25 51 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [9]
C000060790 [Member] | GNMA zero coupon 4 50 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [9]
C000060790 [Member] | UMBS 30 Year 2 00 5 50 due 3 1 52 5 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [9]
C000060790 [Member] | Flagship Credit Auto Trust 1 59 6 30 due 3 16 26 4 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [9]
C000060790 [Member] | FHLMC zero coupon 9 304 due 5 25 44 8 15 56 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [9]
C000060790 [Member] | Exeter Automobile Receivables Trust 3 04 10 45 due 12 15 28 9 15 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [9]
C000060790 [Member] | Wells Fargo Commercial Mortgage Trust 2 70 5 122 due 12 15 39 1 15 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [9]
C000060790 [Member] | CF Hippolyta Issuer LLC 1 69 2 60 due 7 15 60 3 15 61 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [9]
C000060790 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 28.80%
C000060790 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.90%
C000060790 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
C000060790 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000060790 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000060790 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000060790 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000060790 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [10]
C000060790 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (0.30%)
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 3.50% [11]
C000018689 [Member] | State of California 4 875 7 55 due 9 1 29 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [11]
C000018689 [Member] | Commonwealth of Massachusetts 2 663 5 50 due 7 15 29 9 1 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [11]
C000018689 [Member] | State of Connecticut 2 677 5 099 due 5 15 30 3 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [11]
C000018689 [Member] | Alameda Corridor Transportation Authority zero coupon 6 60 due 10 1 29 10 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [11]
C000018689 [Member] | State of Hawaii 1 718 4 936 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [11]
C000018689 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [11]
C000018689 [Member] | New York City Transitional Finance Authority 2 60 5 65 due 5 1 30 11 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [11]
C000018689 [Member] | City of Los Angeles 3 258 5 50 due 5 15 30 6 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [11]
C000018689 [Member] | District of Columbia 5 153 7 625 due 5 1 31 10 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [11]
C000018689 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
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 4.50%
C000018689 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.70%)
C000018689 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 91.20%
C000018689 [Member] | Closed End Fund [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
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 3.50% [13]
C000018691 [Member] | State of California 4 875 7 55 due 9 1 29 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [13]
C000018691 [Member] | Commonwealth of Massachusetts 2 663 5 50 due 7 15 29 9 1 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [13]
C000018691 [Member] | State of Connecticut 2 677 5 099 due 5 15 30 3 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [13]
C000018691 [Member] | Alameda Corridor Transportation Authority zero coupon 6 60 due 10 1 29 10 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [13]
C000018691 [Member] | State of Hawaii 1 718 4 936 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [13]
C000018691 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [13]
C000018691 [Member] | New York City Transitional Finance Authority 2 60 5 65 due 5 1 30 11 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [13]
C000018691 [Member] | City of Los Angeles 3 258 5 50 due 5 15 30 6 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [13]
C000018691 [Member] | District of Columbia 5 153 7 625 due 5 1 31 10 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [13]
C000018691 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
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 4.50%
C000018691 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.70%)
C000018691 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 91.20%
C000018691 [Member] | Closed End Fund [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
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 3.50% [15]
C000018692 [Member] | State of California 4 875 7 55 due 9 1 29 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [15]
C000018692 [Member] | Commonwealth of Massachusetts 2 663 5 50 due 7 15 29 9 1 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [15]
C000018692 [Member] | State of Connecticut 2 677 5 099 due 5 15 30 3 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [15]
C000018692 [Member] | Alameda Corridor Transportation Authority zero coupon 6 60 due 10 1 29 10 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [15]
C000018692 [Member] | State of Hawaii 1 718 4 936 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [15]
C000018692 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [15]
C000018692 [Member] | New York City Transitional Finance Authority 2 60 5 65 due 5 1 30 11 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [15]
C000018692 [Member] | City of Los Angeles 3 258 5 50 due 5 15 30 6 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [15]
C000018692 [Member] | District of Columbia 5 153 7 625 due 5 1 31 10 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [15]
C000018692 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
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 4.50%
C000018692 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.70%)
C000018692 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 91.20%
C000018692 [Member] | Closed End Fund [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
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 3.50% [17]
C000185556 [Member] | State of California 4 875 7 55 due 9 1 29 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [17]
C000185556 [Member] | Commonwealth of Massachusetts 2 663 5 50 due 7 15 29 9 1 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [17]
C000185556 [Member] | State of Connecticut 2 677 5 099 due 5 15 30 3 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [17]
C000185556 [Member] | Alameda Corridor Transportation Authority zero coupon 6 60 due 10 1 29 10 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [17]
C000185556 [Member] | State of Hawaii 1 718 4 936 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [17]
C000185556 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [17]
C000185556 [Member] | New York City Transitional Finance Authority 2 60 5 65 due 5 1 30 11 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [17]
C000185556 [Member] | City of Los Angeles 3 258 5 50 due 5 15 30 6 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [17]
C000185556 [Member] | District of Columbia 5 153 7 625 due 5 1 31 10 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [17]
C000185556 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
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 4.50%
C000185556 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.70%)
C000185556 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 91.20%
C000185556 [Member] | Closed End Fund [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
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 3.50% [19]
C000060791 [Member] | State of California 4 875 7 55 due 9 1 29 10 1 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [19]
C000060791 [Member] | Commonwealth of Massachusetts 2 663 5 50 due 7 15 29 9 1 39 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [19]
C000060791 [Member] | State of Connecticut 2 677 5 099 due 5 15 30 3 15 34 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [19]
C000060791 [Member] | Alameda Corridor Transportation Authority zero coupon 6 60 due 10 1 29 10 1 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [19]
C000060791 [Member] | State of Hawaii 1 718 4 936 due 10 1 30 10 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [19]
C000060791 [Member] | City of New York 1 623 5 75 due 8 1 28 2 1 38 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [19]
C000060791 [Member] | New York City Transitional Finance Authority 2 60 5 65 due 5 1 30 11 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [19]
C000060791 [Member] | City of Los Angeles 3 258 5 50 due 5 15 30 6 1 36 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [19]
C000060791 [Member] | District of Columbia 5 153 7 625 due 5 1 31 10 1 35 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [19]
C000060791 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
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 4.50%
C000060791 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (2.70%)
C000060791 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 91.20%
C000060791 [Member] | Closed End Fund [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000018693 [Member] | TransDigm Inc 4 625 7 125 due 11 15 27 1 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [21]
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 2.10% [21]
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% [21]
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% [21]
C000018693 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 5 1 28 3 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [21]
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 1.00% [21]
C000018693 [Member] | Mineral Resources Ltd 8 00 9 25 due 5 1 27 5 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [21]
C000018693 [Member] | One011778 B C Unlimited Liability Co 3 875 6 125 due 1 15 28 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [21]
C000018693 [Member] | Great Outdoors Group LLC 7 572 due 1 23 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [21]
C000018693 [Member] | LifePoint Health Inc 5 375 11 00 due 1 15 29 6 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [21]
C000018693 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.20%
C000018693 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000018693 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000018693 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000018693 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000018693 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018693 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000018695 [Member] | TransDigm Inc 4 625 7 125 due 11 15 27 1 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [22]
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 2.10% [22]
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% [22]
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% [22]
C000018695 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 5 1 28 3 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [22]
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 1.00% [22]
C000018695 [Member] | Mineral Resources Ltd 8 00 9 25 due 5 1 27 5 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [22]
C000018695 [Member] | One011778 B C Unlimited Liability Co 3 875 6 125 due 1 15 28 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [22]
C000018695 [Member] | Great Outdoors Group LLC 7 572 due 1 23 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [22]
C000018695 [Member] | LifePoint Health Inc 5 375 11 00 due 1 15 29 6 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [22]
C000018695 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.20%
C000018695 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000018695 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000018695 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000018695 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000018695 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018695 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000018696 [Member] | TransDigm Inc 4 625 7 125 due 11 15 27 1 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [23]
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 2.10% [23]
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% [23]
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% [23]
C000018696 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 5 1 28 3 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [23]
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 1.00% [23]
C000018696 [Member] | Mineral Resources Ltd 8 00 9 25 due 5 1 27 5 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [23]
C000018696 [Member] | One011778 B C Unlimited Liability Co 3 875 6 125 due 1 15 28 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [23]
C000018696 [Member] | Great Outdoors Group LLC 7 572 due 1 23 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [23]
C000018696 [Member] | LifePoint Health Inc 5 375 11 00 due 1 15 29 6 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [23]
C000018696 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.20%
C000018696 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000018696 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000018696 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000018696 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000018696 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018696 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000057099 [Member] | TransDigm Inc 4 625 7 125 due 11 15 27 1 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [24]
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 2.10% [24]
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% [24]
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% [24]
C000057099 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 5 1 28 3 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [24]
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 1.00% [24]
C000057099 [Member] | Mineral Resources Ltd 8 00 9 25 due 5 1 27 5 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [24]
C000057099 [Member] | One011778 B C Unlimited Liability Co 3 875 6 125 due 1 15 28 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [24]
C000057099 [Member] | Great Outdoors Group LLC 7 572 due 1 23 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [24]
C000057099 [Member] | LifePoint Health Inc 5 375 11 00 due 1 15 29 6 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [24]
C000057099 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.20%
C000057099 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000057099 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000057099 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000057099 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000057099 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000057099 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000166835 [Member] | TransDigm Inc 4 625 7 125 due 11 15 27 1 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [25]
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 2.10% [25]
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% [25]
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% [25]
C000166835 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 5 1 28 3 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [25]
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 1.00% [25]
C000166835 [Member] | Mineral Resources Ltd 8 00 9 25 due 5 1 27 5 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [25]
C000166835 [Member] | One011778 B C Unlimited Liability Co 3 875 6 125 due 1 15 28 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [25]
C000166835 [Member] | Great Outdoors Group LLC 7 572 due 1 23 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [25]
C000166835 [Member] | LifePoint Health Inc 5 375 11 00 due 1 15 29 6 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [25]
C000166835 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.20%
C000166835 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000166835 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000166835 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000166835 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000166835 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000166835 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000127160 [Member] | TransDigm Inc 4 625 7 125 due 11 15 27 1 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [26]
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 2.10% [26]
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% [26]
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% [26]
C000127160 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 5 1 28 3 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [26]
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 1.00% [26]
C000127160 [Member] | Mineral Resources Ltd 8 00 9 25 due 5 1 27 5 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [26]
C000127160 [Member] | One011778 B C Unlimited Liability Co 3 875 6 125 due 1 15 28 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [26]
C000127160 [Member] | Great Outdoors Group LLC 7 572 due 1 23 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [26]
C000127160 [Member] | LifePoint Health Inc 5 375 11 00 due 1 15 29 6 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [26]
C000127160 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.20%
C000127160 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000127160 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000127160 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000127160 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000127160 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000127160 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000060792 [Member] | TransDigm Inc 4 625 7 125 due 11 15 27 1 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [27]
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 2.10% [27]
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% [27]
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% [27]
C000060792 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 5 1 28 3 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [27]
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 1.00% [27]
C000060792 [Member] | Mineral Resources Ltd 8 00 9 25 due 5 1 27 5 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [27]
C000060792 [Member] | One011778 B C Unlimited Liability Co 3 875 6 125 due 1 15 28 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [27]
C000060792 [Member] | Great Outdoors Group LLC 7 572 due 1 23 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [27]
C000060792 [Member] | LifePoint Health Inc 5 375 11 00 due 1 15 29 6 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [27]
C000060792 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.20%
C000060792 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000060792 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000060792 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000060792 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000060792 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000060792 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000221691 [Member] | TransDigm Inc 4 625 7 125 due 11 15 27 1 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.30% [28]
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 2.10% [28]
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% [28]
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% [28]
C000221691 [Member] | Hilton Domestic Operating Co Inc 4 00 5 875 due 5 1 28 3 15 33 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.10% [28]
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 1.00% [28]
C000221691 [Member] | Mineral Resources Ltd 8 00 9 25 due 5 1 27 5 1 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [28]
C000221691 [Member] | One011778 B C Unlimited Liability Co 3 875 6 125 due 1 15 28 10 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [28]
C000221691 [Member] | Great Outdoors Group LLC 7 572 due 1 23 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.90% [28]
C000221691 [Member] | LifePoint Health Inc 5 375 11 00 due 1 15 29 6 1 32 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00% [28]
C000221691 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 11 1 36 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [29]
C000221691 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.20%
C000221691 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
C000221691 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000221691 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000221691 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000221691 [Member] | Exchange Traded Funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000221691 [Member] | Preferred Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000018697 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [30]
C000018697 [Member] | Commercial Paper [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 43.70%
C000018697 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.20%
C000018697 [Member] | U S Treasury Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.10%
C000018699 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [31]
C000018699 [Member] | Commercial Paper [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 43.70%
C000018699 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.20%
C000018699 [Member] | U S Treasury Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.10%
C000060793 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [32]
C000060793 [Member] | Commercial Paper [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 43.70%
C000060793 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.20%
C000060793 [Member] | U S Treasury Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.10%
C000221692 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [33]
C000221692 [Member] | Commercial Paper [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 43.70%
C000221692 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 32.20%
C000221692 [Member] | U S Treasury Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.10%
C000018700 [Member] | Los Angeles Department of Water And Power 3 65 6 603 due 7 1 28 7 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [34]
C000018700 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 30 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [34]
C000018700 [Member] | California Community Choice Financing Authority 4 00 5 25 due 2 1 52 11 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [34]
C000018700 [Member] | Black Belt Energy Gas District 4 00 5 50 due 6 1 49 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [34]
C000018700 [Member] | New York State Dormitory Authority 3 00 5 75 due 7 1 27 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [34]
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 1.50% [34]
C000018700 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [34]
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% [34]
C000018700 [Member] | Triborough Bridge And Tunnel Authority 3 00 5 50 due 3 15 27 5 15 63 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [34]
C000018700 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 11 1 36 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [34]
C000018700 [Member] | Colorado [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000018700 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000018700 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000018700 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000018700 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
C000018700 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018700 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000018700 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000018700 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000018700 [Member] | UTAH  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000018702 [Member] | Los Angeles Department of Water And Power 3 65 6 603 due 7 1 28 7 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [35]
C000018702 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 30 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [35]
C000018702 [Member] | California Community Choice Financing Authority 4 00 5 25 due 2 1 52 11 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [35]
C000018702 [Member] | Black Belt Energy Gas District 4 00 5 50 due 6 1 49 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [35]
C000018702 [Member] | New York State Dormitory Authority 3 00 5 75 due 7 1 27 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [35]
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 1.50% [35]
C000018702 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [35]
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% [35]
C000018702 [Member] | Triborough Bridge And Tunnel Authority 3 00 5 50 due 3 15 27 5 15 63 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [35]
C000018702 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 11 1 36 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [35]
C000018702 [Member] | Colorado [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000018702 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000018702 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000018702 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000018702 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
C000018702 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018702 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000018702 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000018702 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000018702 [Member] | UTAH  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000221693 [Member] | Los Angeles Department of Water And Power 3 65 6 603 due 7 1 28 7 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [29]
C000221693 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 30 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [29]
C000221693 [Member] | California Community Choice Financing Authority 4 00 5 25 due 2 1 52 11 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [29]
C000221693 [Member] | Black Belt Energy Gas District 4 00 5 50 due 6 1 49 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [29]
C000221693 [Member] | New York State Dormitory Authority 3 00 5 75 due 7 1 27 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [29]
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 1.50% [29]
C000221693 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [29]
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% [29]
C000221693 [Member] | Triborough Bridge And Tunnel Authority 3 00 5 50 due 3 15 27 5 15 63 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [29]
C000221693 [Member] | Colorado [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000221693 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000221693 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000221693 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000221693 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
C000221693 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000221693 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000221693 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000221693 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000221693 [Member] | UTAH  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000082082 [Member] | Los Angeles Department of Water And Power 3 65 6 603 due 7 1 28 7 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [36]
C000082082 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 30 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [36]
C000082082 [Member] | California Community Choice Financing Authority 4 00 5 25 due 2 1 52 11 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [36]
C000082082 [Member] | Black Belt Energy Gas District 4 00 5 50 due 6 1 49 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [36]
C000082082 [Member] | New York State Dormitory Authority 3 00 5 75 due 7 1 27 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [36]
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 1.50% [36]
C000082082 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [36]
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% [36]
C000082082 [Member] | Triborough Bridge And Tunnel Authority 3 00 5 50 due 3 15 27 5 15 63 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [36]
C000082082 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 11 1 36 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [36]
C000082082 [Member] | Colorado [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000082082 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000082082 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000082082 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000082082 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
C000082082 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000082082 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000082082 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000082082 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000082082 [Member] | UTAH  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000185560 [Member] | Los Angeles Department of Water And Power 3 65 6 603 due 7 1 28 7 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [37]
C000185560 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 30 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [37]
C000185560 [Member] | California Community Choice Financing Authority 4 00 5 25 due 2 1 52 11 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [37]
C000185560 [Member] | Black Belt Energy Gas District 4 00 5 50 due 6 1 49 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [37]
C000185560 [Member] | New York State Dormitory Authority 3 00 5 75 due 7 1 27 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [37]
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 1.50% [37]
C000185560 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [37]
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% [37]
C000185560 [Member] | Triborough Bridge And Tunnel Authority 3 00 5 50 due 3 15 27 5 15 63 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [37]
C000185560 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 11 1 36 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [37]
C000185560 [Member] | Colorado [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000185560 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000185560 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000185560 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000185560 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
C000185560 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000185560 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000185560 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000185560 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000185560 [Member] | UTAH  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000060794 [Member] | Los Angeles Department of Water And Power 3 65 6 603 due 7 1 28 7 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50% [38]
C000060794 [Member] | San Francisco City And County Airport Commission 5 00 5 50 due 5 1 30 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50% [38]
C000060794 [Member] | California Community Choice Financing Authority 4 00 5 25 due 2 1 52 11 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.20% [38]
C000060794 [Member] | Black Belt Energy Gas District 4 00 5 50 due 6 1 49 5 1 55 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [38]
C000060794 [Member] | New York State Dormitory Authority 3 00 5 75 due 7 1 27 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [38]
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 1.50% [38]
C000060794 [Member] | New Hampshire Business Finance Authority 3 00 6 89 due 4 1 34 7 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [38]
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% [38]
C000060794 [Member] | Triborough Bridge And Tunnel Authority 3 00 5 50 due 3 15 27 5 15 63 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50% [38]
C000060794 [Member] | New York City Transitional Finance Authority 3 00 5 50 due 11 1 36 5 1 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [38]
C000060794 [Member] | Colorado [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000060794 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000060794 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000060794 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000060794 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
C000060794 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000060794 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000060794 [Member] | GEORGIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000060794 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000060794 [Member] | UTAH  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000018703 [Member] | NRG Energy Inc 2 75 due 6 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60% [39]
C000018703 [Member] | Lantheus Holdings Inc 2 625 due 12 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [39]
C000018703 [Member] | Merit Medical Systems Inc 3 00 due 2 1 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [39]
C000018703 [Member] | Tetra Tech Inc 2 25 due 8 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [39]
C000018703 [Member] | Post Holdings Inc 2 50 due 8 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [39]
C000018703 [Member] | Southwest Airlines Co 1 25 due 5 1 25 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [39]
C000018703 [Member] | Integer Holdings Corp 1 875 due 3 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [39]
C000018703 [Member] | Booking Holdings Inc 0 75 due 5 1 25 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [39]
C000018703 [Member] | PG And E Corp 4 25 due 12 1 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [39]
C000018703 [Member] | Welltower OP LLC 3 125 due 7 15 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [39]
C000018703 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000018703 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000018703 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000018703 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.90%
C000018703 [Member] | Convertible Preferred Stocks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000018705 [Member] | NRG Energy Inc 2 75 due 6 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60% [40]
C000018705 [Member] | Lantheus Holdings Inc 2 625 due 12 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [40]
C000018705 [Member] | Merit Medical Systems Inc 3 00 due 2 1 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [40]
C000018705 [Member] | Tetra Tech Inc 2 25 due 8 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [40]
C000018705 [Member] | Post Holdings Inc 2 50 due 8 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [40]
C000018705 [Member] | Southwest Airlines Co 1 25 due 5 1 25 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [40]
C000018705 [Member] | Integer Holdings Corp 1 875 due 3 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [40]
C000018705 [Member] | Booking Holdings Inc 0 75 due 5 1 25 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [40]
C000018705 [Member] | PG And E Corp 4 25 due 12 1 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [40]
C000018705 [Member] | Welltower OP LLC 3 125 due 7 15 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [40]
C000018705 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000018705 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000018705 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000018705 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.90%
C000018705 [Member] | Convertible Preferred Stocks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000087595 [Member] | NRG Energy Inc 2 75 due 6 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60% [41]
C000087595 [Member] | Lantheus Holdings Inc 2 625 due 12 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [41]
C000087595 [Member] | Merit Medical Systems Inc 3 00 due 2 1 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [41]
C000087595 [Member] | Tetra Tech Inc 2 25 due 8 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [41]
C000087595 [Member] | Post Holdings Inc 2 50 due 8 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [41]
C000087595 [Member] | Southwest Airlines Co 1 25 due 5 1 25 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [41]
C000087595 [Member] | Integer Holdings Corp 1 875 due 3 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [41]
C000087595 [Member] | Booking Holdings Inc 0 75 due 5 1 25 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [41]
C000087595 [Member] | PG And E Corp 4 25 due 12 1 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [41]
C000087595 [Member] | Welltower OP LLC 3 125 due 7 15 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [41]
C000087595 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000087595 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000087595 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000087595 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.90%
C000087595 [Member] | Convertible Preferred Stocks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000060795 [Member] | NRG Energy Inc 2 75 due 6 1 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60% [42]
C000060795 [Member] | Lantheus Holdings Inc 2 625 due 12 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [42]
C000060795 [Member] | Merit Medical Systems Inc 3 00 due 2 1 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [42]
C000060795 [Member] | Tetra Tech Inc 2 25 due 8 15 28 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [42]
C000060795 [Member] | Post Holdings Inc 2 50 due 8 15 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [42]
C000060795 [Member] | Southwest Airlines Co 1 25 due 5 1 25 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [42]
C000060795 [Member] | Integer Holdings Corp 1 875 due 3 15 30 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [42]
C000060795 [Member] | Booking Holdings Inc 0 75 due 5 1 25 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [42]
C000060795 [Member] | PG And E Corp 4 25 due 12 1 27 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [42]
C000060795 [Member] | Welltower OP LLC 3 125 due 7 15 29 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.60% [42]
C000060795 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000060795 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000060795 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000060795 [Member] | Convertible Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.90%
C000060795 [Member] | Convertible Preferred Stocks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000018706 [Member] | GNMA zero coupon 7 764 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [43]
C000018706 [Member] | UMBS 30 Year 2 00 6 50 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [43]
C000018706 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [43]
C000018706 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [43]
C000018706 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [43]
C000018706 [Member] | AbbVie Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [43]
C000018706 [Member] | International Business Machines Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [43]
C000018706 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 9 25 41 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [43]
C000018706 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [43]
C000018706 [Member] | Philip Morris International Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [43]
C000018706 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000018706 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000018706 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000018706 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018706 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000018706 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018706 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000018706 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 62.00%
C000018706 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000018708 [Member] | GNMA zero coupon 7 764 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [44]
C000018708 [Member] | UMBS 30 Year 2 00 6 50 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [44]
C000018708 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [44]
C000018708 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [44]
C000018708 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [44]
C000018708 [Member] | AbbVie Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [44]
C000018708 [Member] | International Business Machines Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [44]
C000018708 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 9 25 41 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [44]
C000018708 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [44]
C000018708 [Member] | Philip Morris International Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [44]
C000018708 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000018708 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000018708 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000018708 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018708 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000018708 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018708 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000018708 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 62.00%
C000018708 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000018709 [Member] | GNMA zero coupon 7 764 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [45]
C000018709 [Member] | UMBS 30 Year 2 00 6 50 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [45]
C000018709 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [45]
C000018709 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [45]
C000018709 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [45]
C000018709 [Member] | AbbVie Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [45]
C000018709 [Member] | International Business Machines Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [45]
C000018709 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 9 25 41 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [45]
C000018709 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [45]
C000018709 [Member] | Philip Morris International Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [45]
C000018709 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000018709 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000018709 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000018709 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018709 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000018709 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000018709 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000018709 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 62.00%
C000018709 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000185564 [Member] | GNMA zero coupon 7 764 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [46]
C000185564 [Member] | UMBS 30 Year 2 00 6 50 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [46]
C000185564 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [46]
C000185564 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [46]
C000185564 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [46]
C000185564 [Member] | AbbVie Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [46]
C000185564 [Member] | International Business Machines Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [46]
C000185564 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 9 25 41 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [46]
C000185564 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [46]
C000185564 [Member] | Philip Morris International Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [46]
C000185564 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000185564 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000185564 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000185564 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000185564 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000185564 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000185564 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000185564 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 62.00%
C000185564 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000060796 [Member] | GNMA zero coupon 7 764 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [47]
C000060796 [Member] | UMBS 30 Year 2 00 6 50 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [47]
C000060796 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [47]
C000060796 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [47]
C000060796 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [47]
C000060796 [Member] | AbbVie Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [47]
C000060796 [Member] | International Business Machines Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [47]
C000060796 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 9 25 41 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [47]
C000060796 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [47]
C000060796 [Member] | Philip Morris International Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [47]
C000060796 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000060796 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000060796 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000060796 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000060796 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000060796 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000060796 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000060796 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 62.00%
C000060796 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000221696 [Member] | GNMA zero coupon 7 764 due 7 20 44 2 16 66 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [48]
C000221696 [Member] | UMBS 30 Year 2 00 6 50 due 8 1 48 9 1 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00% [48]
C000221696 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [48]
C000221696 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [48]
C000221696 [Member] | Connecticut Avenue Securities Trust 6 053 14 204 due 11 25 39 2 25 45 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40% [48]
C000221696 [Member] | AbbVie Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [48]
C000221696 [Member] | International Business Machines Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [48]
C000221696 [Member] | FHLMC STACR REMIC Trust 6 004 11 454 due 9 25 41 1 25 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30% [48]
C000221696 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [48]
C000221696 [Member] | Philip Morris International Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20% [48]
C000221696 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000221696 [Member] | Collateralized Mortgage-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
C000221696 [Member] | U S Government And Federal Agencies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000221696 [Member] | Asset-Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000221696 [Member] | Foreign Government Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000221696 [Member] | Loan Assignments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000221696 [Member] | Short-Term Investments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000221696 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 62.00%
C000221696 [Member] | Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000018710 [Member] | Brazil Government Bond 3 875 7 125 due 6 12 30 5 13 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70% [49]
C000018710 [Member] | Colombia Government Bond 5 00 8 75 due 4 20 33 11 14 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10% [49]
C000018710 [Member] | Mexico Government Bond 3 50 6 00 due 5 19 33 10 12 2110 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [49]
C000018710 [Member] | Dominican Republic Government Bond 4 875 7 05 due 2 22 29 1 30 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [49]
C000018710 [Member] | Hungary Government Bond 2 125 7 625 due 6 16 29 3 29 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [49]
C000018710 [Member] | Poland Government Bond 5 375 5 50 due 2 12 35 3 18 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [49]
C000018710 [Member] | Turkey Government Bond 4 875 5 75 due 3 13 30 5 11 47 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [49]
C000018710 [Member] | Egypt Government Bond 7 625 8 875 due 5 29 32 5 29 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [49]
C000018710 [Member] | Argentina Government Bond 0 75 3 50 due 7 9 29 7 9 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [49]
C000018710 [Member] | Oman Government Bond 6 00 6 75 due 8 1 29 1 17 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [49]
C000018710 [Member] | COLOMBIA  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018710 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000018710 [Member] | HUNGARY  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000018710 [Member] | POLAND  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000018710 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000018710 [Member] | DOMINICAN REPUBLIC  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000018710 [Member] | EGYPT  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018710 [Member] | UNITED STATES  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018710 [Member] | ARGENTINA  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000018710 [Member] | TÜRKIYE  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000018712 [Member] | Brazil Government Bond 3 875 7 125 due 6 12 30 5 13 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70% [50]
C000018712 [Member] | Colombia Government Bond 5 00 8 75 due 4 20 33 11 14 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10% [50]
C000018712 [Member] | Mexico Government Bond 3 50 6 00 due 5 19 33 10 12 2110 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [50]
C000018712 [Member] | Dominican Republic Government Bond 4 875 7 05 due 2 22 29 1 30 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [50]
C000018712 [Member] | Hungary Government Bond 2 125 7 625 due 6 16 29 3 29 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [50]
C000018712 [Member] | Poland Government Bond 5 375 5 50 due 2 12 35 3 18 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [50]
C000018712 [Member] | Turkey Government Bond 4 875 5 75 due 3 13 30 5 11 47 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [50]
C000018712 [Member] | Egypt Government Bond 7 625 8 875 due 5 29 32 5 29 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [50]
C000018712 [Member] | Argentina Government Bond 0 75 3 50 due 7 9 29 7 9 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [50]
C000018712 [Member] | Oman Government Bond 6 00 6 75 due 8 1 29 1 17 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [50]
C000018712 [Member] | COLOMBIA  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018712 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000018712 [Member] | HUNGARY  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000018712 [Member] | POLAND  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000018712 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000018712 [Member] | DOMINICAN REPUBLIC  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000018712 [Member] | EGYPT  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018712 [Member] | UNITED STATES  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000018712 [Member] | ARGENTINA  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000018712 [Member] | TÜRKIYE  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000052120 [Member] | Brazil Government Bond 3 875 7 125 due 6 12 30 5 13 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70% [51]
C000052120 [Member] | Colombia Government Bond 5 00 8 75 due 4 20 33 11 14 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10% [51]
C000052120 [Member] | Mexico Government Bond 3 50 6 00 due 5 19 33 10 12 2110 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [51]
C000052120 [Member] | Dominican Republic Government Bond 4 875 7 05 due 2 22 29 1 30 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [51]
C000052120 [Member] | Hungary Government Bond 2 125 7 625 due 6 16 29 3 29 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [51]
C000052120 [Member] | Poland Government Bond 5 375 5 50 due 2 12 35 3 18 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [51]
C000052120 [Member] | Turkey Government Bond 4 875 5 75 due 3 13 30 5 11 47 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [51]
C000052120 [Member] | Egypt Government Bond 7 625 8 875 due 5 29 32 5 29 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [51]
C000052120 [Member] | Argentina Government Bond 0 75 3 50 due 7 9 29 7 9 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [51]
C000052120 [Member] | Oman Government Bond 6 00 6 75 due 8 1 29 1 17 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [51]
C000052120 [Member] | COLOMBIA  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000052120 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000052120 [Member] | HUNGARY  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000052120 [Member] | POLAND  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000052120 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000052120 [Member] | DOMINICAN REPUBLIC  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000052120 [Member] | EGYPT  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000052120 [Member] | UNITED STATES  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000052120 [Member] | ARGENTINA  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000052120 [Member] | TÜRKIYE  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000060797 [Member] | Brazil Government Bond 3 875 7 125 due 6 12 30 5 13 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70% [52]
C000060797 [Member] | Colombia Government Bond 5 00 8 75 due 4 20 33 11 14 53 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10% [52]
C000060797 [Member] | Mexico Government Bond 3 50 6 00 due 5 19 33 10 12 2110 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70% [52]
C000060797 [Member] | Dominican Republic Government Bond 4 875 7 05 due 2 22 29 1 30 60 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40% [52]
C000060797 [Member] | Hungary Government Bond 2 125 7 625 due 6 16 29 3 29 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [52]
C000060797 [Member] | Poland Government Bond 5 375 5 50 due 2 12 35 3 18 54 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.70% [52]
C000060797 [Member] | Turkey Government Bond 4 875 5 75 due 3 13 30 5 11 47 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [52]
C000060797 [Member] | Egypt Government Bond 7 625 8 875 due 5 29 32 5 29 50 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10% [52]
C000060797 [Member] | Argentina Government Bond 0 75 3 50 due 7 9 29 7 9 41 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [52]
C000060797 [Member] | Oman Government Bond 6 00 6 75 due 8 1 29 1 17 48 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80% [52]
C000060797 [Member] | COLOMBIA  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000060797 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000060797 [Member] | HUNGARY  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000060797 [Member] | POLAND  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000060797 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000060797 [Member] | DOMINICAN REPUBLIC  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000060797 [Member] | EGYPT  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000060797 [Member] | UNITED STATES  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000060797 [Member] | ARGENTINA  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000060797 [Member] | TÜRKIYE  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000018719 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20% [53]
C000018719 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [53]
C000018719 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [53]
C000018719 [Member] | Copart Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90% [53]
C000018719 [Member] | Markel Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [53]
C000018719 [Member] | Berkshire Hathaway Inc Class B [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [53]
C000018719 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [53]
C000018719 [Member] | Cintas Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00% [53]
C000018719 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [53]
C000018719 [Member] | O Reilly Automotive Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [53]
C000018719 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000018719 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000018719 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.50%
C000018719 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000018719 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000018719 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018719 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000018719 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000018719 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018719 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000018721 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20% [54]
C000018721 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [54]
C000018721 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [54]
C000018721 [Member] | Copart Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90% [54]
C000018721 [Member] | Markel Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [54]
C000018721 [Member] | Berkshire Hathaway Inc Class B [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [54]
C000018721 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [54]
C000018721 [Member] | Cintas Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00% [54]
C000018721 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [54]
C000018721 [Member] | O Reilly Automotive Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [54]
C000018721 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000018721 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000018721 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.50%
C000018721 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000018721 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000018721 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018721 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000018721 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000018721 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018721 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000018722 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20% [55]
C000018722 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [55]
C000018722 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [55]
C000018722 [Member] | Copart Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90% [55]
C000018722 [Member] | Markel Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [55]
C000018722 [Member] | Berkshire Hathaway Inc Class B [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [55]
C000018722 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [55]
C000018722 [Member] | Cintas Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00% [55]
C000018722 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [55]
C000018722 [Member] | O Reilly Automotive Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [55]
C000018722 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000018722 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000018722 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.50%
C000018722 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000018722 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000018722 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018722 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000018722 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000018722 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000018722 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000179143 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20% [56]
C000179143 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [56]
C000179143 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [56]
C000179143 [Member] | Copart Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90% [56]
C000179143 [Member] | Markel Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [56]
C000179143 [Member] | Berkshire Hathaway Inc Class B [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [56]
C000179143 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [56]
C000179143 [Member] | Cintas Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00% [56]
C000179143 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [56]
C000179143 [Member] | O Reilly Automotive Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [56]
C000179143 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000179143 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000179143 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.50%
C000179143 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000179143 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000179143 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000179143 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000179143 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000179143 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000179143 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000060799 [Member] | Constellation Software Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20% [57]
C000060799 [Member] | Progressive Corp The [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.70% [57]
C000060799 [Member] | NVR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40% [57]
C000060799 [Member] | Copart Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90% [57]
C000060799 [Member] | Markel Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80% [57]
C000060799 [Member] | Berkshire Hathaway Inc Class B [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30% [57]
C000060799 [Member] | Linde plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [57]
C000060799 [Member] | Cintas Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00% [57]
C000060799 [Member] | PACCAR Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [57]
C000060799 [Member] | O Reilly Automotive Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80% [57]
C000060799 [Member] | Commercial Services And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000060799 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000060799 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.50%
C000060799 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000060799 [Member] | Electronic Equipment Instruments And Components [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000060799 [Member] | Household Durables [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000060799 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000060799 [Member] | Specialty Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000060799 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000060799 [Member] | Chemicals Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000018724 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [58]
C000018724 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40% [58]
C000018724 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80% [58]
C000018724 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.40% [58]
C000018724 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60% [58]
C000018724 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00% [58]
C000018724 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [58]
C000018724 [Member] | Visa Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [58]
C000018724 [Member] | Netflix Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [58]
C000018724 [Member] | Spotify Technology SA [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [58]
C000018724 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.30%
C000018724 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000018724 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000018724 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000018724 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018724 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000018724 [Member] | Entertainment Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000018724 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018724 [Member] | Health Care Equipment And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018724 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000018726 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [59]
C000018726 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40% [59]
C000018726 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80% [59]
C000018726 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.40% [59]
C000018726 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60% [59]
C000018726 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00% [59]
C000018726 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [59]
C000018726 [Member] | Visa Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [59]
C000018726 [Member] | Netflix Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [59]
C000018726 [Member] | Spotify Technology SA [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [59]
C000018726 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.30%
C000018726 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000018726 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000018726 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000018726 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018726 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000018726 [Member] | Entertainment Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000018726 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018726 [Member] | Health Care Equipment And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018726 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000018727 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [60]
C000018727 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40% [60]
C000018727 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80% [60]
C000018727 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.40% [60]
C000018727 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60% [60]
C000018727 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00% [60]
C000018727 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [60]
C000018727 [Member] | Visa Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [60]
C000018727 [Member] | Netflix Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [60]
C000018727 [Member] | Spotify Technology SA [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [60]
C000018727 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.30%
C000018727 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000018727 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000018727 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000018727 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018727 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000018727 [Member] | Entertainment Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000018727 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018727 [Member] | Health Care Equipment And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018727 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000018728 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [61]
C000018728 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40% [61]
C000018728 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80% [61]
C000018728 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.40% [61]
C000018728 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60% [61]
C000018728 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00% [61]
C000018728 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [61]
C000018728 [Member] | Visa Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [61]
C000018728 [Member] | Netflix Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [61]
C000018728 [Member] | Spotify Technology SA [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [61]
C000018728 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.30%
C000018728 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000018728 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000018728 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000018728 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018728 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000018728 [Member] | Entertainment Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000018728 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018728 [Member] | Health Care Equipment And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018728 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000018729 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [62]
C000018729 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40% [62]
C000018729 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80% [62]
C000018729 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.40% [62]
C000018729 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60% [62]
C000018729 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00% [62]
C000018729 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [62]
C000018729 [Member] | Visa Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [62]
C000018729 [Member] | Netflix Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [62]
C000018729 [Member] | Spotify Technology SA [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [62]
C000018729 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.30%
C000018729 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000018729 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000018729 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000018729 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018729 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000018729 [Member] | Entertainment Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000018729 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000018729 [Member] | Health Care Equipment And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000018729 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000030958 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [63]
C000030958 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40% [63]
C000030958 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80% [63]
C000030958 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.40% [63]
C000030958 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60% [63]
C000030958 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00% [63]
C000030958 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [63]
C000030958 [Member] | Visa Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [63]
C000030958 [Member] | Netflix Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [63]
C000030958 [Member] | Spotify Technology SA [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [63]
C000030958 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.30%
C000030958 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000030958 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000030958 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000030958 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000030958 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000030958 [Member] | Entertainment Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000030958 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000030958 [Member] | Health Care Equipment And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000030958 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000127162 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [64]
C000127162 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40% [64]
C000127162 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80% [64]
C000127162 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.40% [64]
C000127162 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60% [64]
C000127162 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00% [64]
C000127162 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [64]
C000127162 [Member] | Visa Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [64]
C000127162 [Member] | Netflix Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [64]
C000127162 [Member] | Spotify Technology SA [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [64]
C000127162 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.30%
C000127162 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000127162 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000127162 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000127162 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000127162 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000127162 [Member] | Entertainment Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000127162 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000127162 [Member] | Health Care Equipment And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000127162 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000060800 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [65]
C000060800 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40% [65]
C000060800 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80% [65]
C000060800 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.40% [65]
C000060800 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60% [65]
C000060800 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00% [65]
C000060800 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [65]
C000060800 [Member] | Visa Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [65]
C000060800 [Member] | Netflix Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [65]
C000060800 [Member] | Spotify Technology SA [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [65]
C000060800 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.30%
C000060800 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000060800 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000060800 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000060800 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000060800 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000060800 [Member] | Entertainment Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000060800 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000060800 [Member] | Health Care Equipment And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000060800 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000221700 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [66]
C000221700 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.40% [66]
C000221700 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80% [66]
C000221700 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.40% [66]
C000221700 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60% [66]
C000221700 [Member] | Meta Platforms Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00% [66]
C000221700 [Member] | Eli Lilly And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.10% [66]
C000221700 [Member] | Visa Inc Class A [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [66]
C000221700 [Member] | Netflix Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% [66]
C000221700 [Member] | Spotify Technology SA [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90% [66]
C000221700 [Member] | Software [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.30%
C000221700 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000221700 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000221700 [Member] | Interactive Media And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000221700 [Member] | Broadline Retail [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000221700 [Member] | Hotels Restaurants And Leisure [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000221700 [Member] | Entertainment Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000221700 [Member] | Technology Hardware Storage And Peripherals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000221700 [Member] | Health Care Equipment And Supplies [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000221700 [Member] | Aerospace And Defense [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000018730 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [67]
C000018730 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [67]
C000018730 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [67]
C000018730 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [67]
C000018730 [Member] | Gilead Sciences Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [67]
C000018730 [Member] | American International Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [67]
C000018730 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [67]
C000018730 [Member] | Johnson Controls International plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [67]
C000018730 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [67]
C000018730 [Member] | Marsh And McLennan Cos Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [67]
C000018730 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018730 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000018730 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018730 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000018730 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000018730 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000018730 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000018730 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018730 [Member] | Multi Utilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000018730 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000018732 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [68]
C000018732 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [68]
C000018732 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [68]
C000018732 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [68]
C000018732 [Member] | Gilead Sciences Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [68]
C000018732 [Member] | American International Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [68]
C000018732 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [68]
C000018732 [Member] | Johnson Controls International plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [68]
C000018732 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [68]
C000018732 [Member] | Marsh And McLennan Cos Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [68]
C000018732 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018732 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000018732 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018732 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000018732 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000018732 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000018732 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000018732 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018732 [Member] | Multi Utilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000018732 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000018733 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [69]
C000018733 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [69]
C000018733 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [69]
C000018733 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [69]
C000018733 [Member] | Gilead Sciences Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [69]
C000018733 [Member] | American International Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [69]
C000018733 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [69]
C000018733 [Member] | Johnson Controls International plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [69]
C000018733 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [69]
C000018733 [Member] | Marsh And McLennan Cos Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [69]
C000018733 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000018733 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000018733 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000018733 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000018733 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000018733 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000018733 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000018733 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000018733 [Member] | Multi Utilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000018733 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000185571 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [70]
C000185571 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [70]
C000185571 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [70]
C000185571 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [70]
C000185571 [Member] | Gilead Sciences Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [70]
C000185571 [Member] | American International Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [70]
C000185571 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [70]
C000185571 [Member] | Johnson Controls International plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [70]
C000185571 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [70]
C000185571 [Member] | Marsh And McLennan Cos Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [70]
C000185571 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000185571 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000185571 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000185571 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000185571 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000185571 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000185571 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000185571 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000185571 [Member] | Multi Utilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000185571 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000060801 [Member] | Cisco Systems Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40% [71]
C000060801 [Member] | JPMorgan Chase And Co [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90% [71]
C000060801 [Member] | Johnson And Johnson [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.20% [71]
C000060801 [Member] | UnitedHealth Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.70% [71]
C000060801 [Member] | Gilead Sciences Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [71]
C000060801 [Member] | American International Group Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.10% [71]
C000060801 [Member] | Pfizer Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [71]
C000060801 [Member] | Johnson Controls International plc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [71]
C000060801 [Member] | Elevance Health Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90% [71]
C000060801 [Member] | Marsh And McLennan Cos Inc [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.80% [71]
C000060801 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000060801 [Member] | Machinery [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000060801 [Member] | Specialized REITs [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000060801 [Member] | Pharmaceuticals [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000060801 [Member] | Oil Gas And Consumable Fuels [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000060801 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000060801 [Member] | Health Care Providers And Services [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000060801 [Member] | Communications Equipment [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000060801 [Member] | Multi Utilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000060801 [Member] | Capital Markets [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
[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] Excluding short-term investments
[23] Excluding short-term investments
[24] Excluding short-term investments
[25] Excluding short-term investments
[26] Excluding short-term investments
[27] Excluding short-term investments
[28] Excluding short-term investments
[29] Excluding short-term investments
[30] Less than one-tenth of a percent.
[31] Less than one-tenth of a percent.
[32] Less than one-tenth of a percent.
[33] Less than one-tenth of a percent.
[34] Excluding short-term investments
[35] Excluding short-term investments
[36] Excluding short-term investments
[37] Excluding short-term investments
[38] Excluding short-term investments
[39] Excluding short-term investments
[40] Excluding short-term investments
[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