v3.25.2
Shareholder Report, Holdings (Details)
May 31, 2025
C000005044 | U.S. Treasury Notes8708287  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000005044 | Comcast Corp.8680645  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000005044 | U.S. Treasury Notes8708302  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000005044 | U.S. Treasury Notes8708294  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000005044 | Bank of America Corp.8680481  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000005044 | Prologis8693512  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000005044 | American Express8680465  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000005044 | Prologis8693516  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000005044 | Citibank8680527  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000005044 | FNMA8710072  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000005044 | Non-Agency CMBS  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000005044 | Short-Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000005044 | Asset-Backed Security  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000005044 | U.S. Treasury Obligation  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
C000005044 | Corporate Bond  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
C000005044 | Municipal Bond  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
C000005044 | U.S. Government & Agency Obligation  
Holdings [Line Items]  
Percent of Net Asset Value 59.70%
C000048038 | U.S. Treasury Notes8708287  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000048038 | Comcast Corp.8680645  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000048038 | U.S. Treasury Notes8708302  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000048038 | U.S. Treasury Notes8708294  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000048038 | Bank of America Corp.8680481  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000048038 | Prologis8693512  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000048038 | American Express8680465  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000048038 | Prologis8693516  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000048038 | Citibank8680527  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000048038 | FNMA8710072  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000048038 | Non-Agency CMBS  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000048038 | Short-Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000048038 | Asset-Backed Security  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000048038 | U.S. Treasury Obligation  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
C000048038 | Corporate Bond  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
C000048038 | Municipal Bond  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
C000048038 | U.S. Government & Agency Obligation  
Holdings [Line Items]  
Percent of Net Asset Value 59.70%
C000048039 | U.S. Treasury Notes8708287  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000048039 | Comcast Corp.8680645  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000048039 | U.S. Treasury Notes8708302  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000048039 | U.S. Treasury Notes8708294  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000048039 | Bank of America Corp.8680481  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000048039 | Prologis8693512  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000048039 | American Express8680465  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000048039 | Prologis8693516  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000048039 | Citibank8680527  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000048039 | FNMA8710072  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000048039 | Non-Agency CMBS  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000048039 | Short-Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000048039 | Asset-Backed Security  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000048039 | U.S. Treasury Obligation  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
C000048039 | Corporate Bond  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
C000048039 | Municipal Bond  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
C000048039 | U.S. Government & Agency Obligation  
Holdings [Line Items]  
Percent of Net Asset Value 59.70%