v3.25.2
Shareholder Report, Holdings (Details)
May 31, 2025
C000024768 | Collaterized Mortgage Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
C000024768 | Common Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
C000024768 | Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
C000024768 | Municipal Bond  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
C000024768 | Preferred Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
C000024768 | Cash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000024768 | U.S. Treasury Securities  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000024768 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 94.80%
C000024770 | Collaterized Mortgage Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
C000024770 | Common Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
C000024770 | Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
C000024770 | Municipal Bond  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
C000024770 | Preferred Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [2]
C000024770 | Cash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000024770 | U.S. Treasury Securities  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000024770 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 94.80%
C000024771 | Collaterized Mortgage Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [3]
C000024771 | Common Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [3]
C000024771 | Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [3]
C000024771 | Municipal Bond  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [3]
C000024771 | Preferred Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [3]
C000024771 | Cash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000024771 | U.S. Treasury Securities  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000024771 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 94.80%
C000062220 | Collaterized Mortgage Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [4]
C000062220 | Common Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [4]
C000062220 | Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [4]
C000062220 | Municipal Bond  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [4]
C000062220 | Preferred Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [4]
C000062220 | Cash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000062220 | U.S. Treasury Securities  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000062220 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 94.80%
C000173769 | Collaterized Mortgage Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [5]
C000173769 | Common Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [5]
C000173769 | Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [5]
C000173769 | Municipal Bond  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [5]
C000173769 | Preferred Stock  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [5]
C000173769 | Cash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000173769 | U.S. Treasury Securities  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000173769 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 94.80%
[1] Represents less than 0.1%.
[2] Represents less than 0.1%.
[3] Represents less than 0.1%.
[4] Represents less than 0.1%.
[5] Represents less than 0.1%.