Shareholder Report, Holdings (Details)	Jul. 31, 2025
C000035161 \| Repurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	41.00%
C000035161 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	18.00%
C000035161 \| Certificates of Deposit and Bank Notes
Holdings [Line Items]
Percent of Net Asset Value	16.00%
C000035161 \| Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	14.00%
C000035161 \| Time Deposits
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000035161 \| Variable Rate Demand Preferred Shares
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000035161 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000035163 \| Repurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	41.00%
C000035163 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	18.00%
C000035163 \| Certificates of Deposit and Bank Notes
Holdings [Line Items]
Percent of Net Asset Value	16.00%
C000035163 \| Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	14.00%
C000035163 \| Time Deposits
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000035163 \| Variable Rate Demand Preferred Shares
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000035163 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000035164 \| Repurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	41.00%
C000035164 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	18.00%
C000035164 \| Certificates of Deposit and Bank Notes
Holdings [Line Items]
Percent of Net Asset Value	16.00%
C000035164 \| Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	14.00%
C000035164 \| Time Deposits
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000035164 \| Variable Rate Demand Preferred Shares
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000035164 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000016691 \| Repurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	41.00%
C000016691 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	18.00%
C000016691 \| Certificates of Deposit and Bank Notes
Holdings [Line Items]
Percent of Net Asset Value	16.00%
C000016691 \| Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	14.00%
C000016691 \| Time Deposits
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000016691 \| Variable Rate Demand Preferred Shares
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000016691 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%

Shareholder Report, Holdings (Details)

Jul. 31, 2025