v3.25.2
Shareholder Report, Holdings (Details)
May 31, 2025
C000119983 | Santander Drive Auto Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000119983 | Carvana Auto Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000119983 | Federal Home Loan Mortgage  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000119983 | U.S. Treasury Notes  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000119983 | Japan Treasury Discount Bill  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000119983 | Exeter Automobile Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000119983 | Verus Securitization Trust  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000119983 | Drive Auto Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000119983 | Conagra Foods  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000119983 | Structured Agency Credit Risk Debt Notes  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
C000119983 | Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 51.50%
C000119983 | Asset-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 25.70%
C000119983 | Non-U.S. Government Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
C000119983 | Commercial Paper  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000119983 | U.S. Government & Agency Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000119983 | Foreign Government Obligations & Municipalities  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000119983 | U.S. Government Agency Obligations (Excluding Mortgage-Backed)  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000119983 | U.S. Treasury Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000119983 | Securities Lending Collateral  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000119983 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000193195 | Santander Drive Auto Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000193195 | Carvana Auto Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000193195 | Federal Home Loan Mortgage  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000193195 | U.S. Treasury Notes  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000193195 | Japan Treasury Discount Bill  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000193195 | Exeter Automobile Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000193195 | Verus Securitization Trust  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000193195 | Drive Auto Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000193195 | Conagra Foods  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000193195 | Structured Agency Credit Risk Debt Notes  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
C000193195 | Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 51.50%
C000193195 | Asset-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 25.70%
C000193195 | Non-U.S. Government Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
C000193195 | Commercial Paper  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000193195 | U.S. Government & Agency Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000193195 | Foreign Government Obligations & Municipalities  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000193195 | U.S. Government Agency Obligations (Excluding Mortgage-Backed)  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000193195 | U.S. Treasury Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000193195 | Securities Lending Collateral  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000193195 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000225825 | Santander Drive Auto Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000225825 | Carvana Auto Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000225825 | Federal Home Loan Mortgage  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000225825 | U.S. Treasury Notes  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000225825 | Japan Treasury Discount Bill  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000225825 | Exeter Automobile Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000225825 | Verus Securitization Trust  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000225825 | Drive Auto Receivables Trust  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000225825 | Conagra Foods  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000225825 | Structured Agency Credit Risk Debt Notes  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
C000225825 | Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 51.50%
C000225825 | Asset-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 25.70%
C000225825 | Non-U.S. Government Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
C000225825 | Commercial Paper  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000225825 | U.S. Government & Agency Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000225825 | Foreign Government Obligations & Municipalities  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000225825 | U.S. Government Agency Obligations (Excluding Mortgage-Backed)  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000225825 | U.S. Treasury Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000225825 | Securities Lending Collateral  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000225825 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%