Shareholder Report, Holdings (Details)	Apr. 30, 2026
C000035155 \| AssetGovernment & Agency Obligations
Holdings [Line Items]
Percent of Net Asset Value	53.00%
C000035155 \| AssetRepurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	46.00%
C000035155 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000035156 \| AssetGovernment & Agency Obligations
Holdings [Line Items]
Percent of Net Asset Value	53.00%
C000035156 \| AssetRepurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	46.00%
C000035156 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000035157 \| AssetGovernment & Agency Obligations
Holdings [Line Items]
Percent of Net Asset Value	53.00%
C000035157 \| AssetRepurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	46.00%
C000035157 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000017334 \| AssetGovernment & Agency Obligations
Holdings [Line Items]
Percent of Net Asset Value	53.00%
C000017334 \| AssetRepurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	46.00%
C000017334 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000017348 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	94.00%
C000017348 \| Tax-Exempt Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	5.00%
C000017348 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000035158 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	94.00%
C000035158 \| Tax-Exempt Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	5.00%
C000035158 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000035159 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	94.00%
C000035159 \| Tax-Exempt Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	5.00%
C000035159 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000017350 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	94.00%
C000017350 \| Tax-Exempt Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	5.00%
C000017350 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000035160 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	94.00%
C000035160 \| Tax-Exempt Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	5.00%
C000035160 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	1.00%

Shareholder Report, Holdings (Details)

Apr. 30, 2026