v3.25.3
Shareholder Report, Holdings (Details)
Aug. 31, 2025
C000005557 | New York State Dormitory Auth., Tender Option Bond Trust Receipts  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000005557 | Illinois Fin. Auth., Northwestern Univ.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000005557 | South Carolina Public Service Auth.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000005557 | RIB Floster, Tender Option Bond Trust Receipts  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000005557 | Houston Combined Utility System  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000005557 | Virginia Housing Dev. Auth., Tender Option Bond Trust Receipts  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000005557 | Clark County Dept. of Aviation  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000005557 | Illinois Fin. Auth., Steppenwolf Theatre Company Project  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000005557 | Harris County Health Fac. Dev., Methodist Hosp. System  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000005557 | Univ. of Texas, Board of Regents  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000005557 | Other Municipal Security  
Holdings [Line Items]  
Percent of Net Asset Value 45.60%
C000005557 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 33.30%
C000005557 | Non-Financial Company Commercial Paper  
Holdings [Line Items]  
Percent of Net Asset Value 20.80%
C000005557 | Short-Term and Other  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000193189 | New York State Dormitory Auth., Tender Option Bond Trust Receipts  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000193189 | Illinois Fin. Auth., Northwestern Univ.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000193189 | South Carolina Public Service Auth.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000193189 | RIB Floster, Tender Option Bond Trust Receipts  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000193189 | Houston Combined Utility System  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000193189 | Virginia Housing Dev. Auth., Tender Option Bond Trust Receipts  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000193189 | Clark County Dept. of Aviation  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000193189 | Illinois Fin. Auth., Steppenwolf Theatre Company Project  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000193189 | Harris County Health Fac. Dev., Methodist Hosp. System  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000193189 | Univ. of Texas, Board of Regents  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000193189 | Other Municipal Security  
Holdings [Line Items]  
Percent of Net Asset Value 45.60%
C000193189 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 33.30%
C000193189 | Non-Financial Company Commercial Paper  
Holdings [Line Items]  
Percent of Net Asset Value 20.80%
C000193189 | Short-Term and Other  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%