v3.26.3
Shareholder Report, Holdings (Details)
Aug. 31, 2026
C000136800 | Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000136800 | Securities Lending Collateral  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000136800 | Bank Loan Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000136800 | Cash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000136800 | Mortgage Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000136800 | Emerging Markets Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000136800 | Asset-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000136800 | Project and Trade Finance Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
C000136800 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 34.20%
C000136800 | U.S. Treasury Securities  
Holdings [Line Items]  
Percent of Net Asset Value 42.60%
C000026765 | Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000026765 | Securities Lending Collateral  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000026765 | Bank Loan Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000026765 | Cash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000026765 | Mortgage Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000026765 | Emerging Markets Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000026765 | Asset-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000026765 | Project and Trade Finance Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
C000026765 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 34.20%
C000026765 | U.S. Treasury Securities  
Holdings [Line Items]  
Percent of Net Asset Value 42.60%
C000136801 | Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000136801 | Securities Lending Collateral  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000136801 | Bank Loan Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000136801 | Cash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000136801 | Mortgage Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000136801 | Emerging Markets Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000136801 | Asset-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000136801 | Project and Trade Finance Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
C000136801 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 34.20%
C000136801 | U.S. Treasury Securities  
Holdings [Line Items]  
Percent of Net Asset Value 42.60%
C000026764 | Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000026764 | Securities Lending Collateral  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000026764 | Bank Loan Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000026764 | Cash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000026764 | Mortgage Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000026764 | Emerging Markets Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000026764 | Asset-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000026764 | Project and Trade Finance Core Fund  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
C000026764 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 34.20%
C000026764 | U.S. Treasury Securities  
Holdings [Line Items]  
Percent of Net Asset Value 42.60%