Shareholder Report, Holdings (Details)	May 31, 2026
C000007065 \| 1 to 7 Days
Holdings [Line Items]
Percent of Net Asset Value	84.20%
C000007065 \| 8 to 30 Days
Holdings [Line Items]
Percent of Net Asset Value	5.30%
C000007065 \| 31 to 60 Days
Holdings [Line Items]
Percent of Net Asset Value	3.70%
C000007065 \| 61 to 90 Days
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000007065 \| 91 to 180 Days
Holdings [Line Items]
Percent of Net Asset Value	1.60%
C000007065 \| Over 180 Days
Holdings [Line Items]
Percent of Net Asset Value	0.10%
C000007065 \| Other Line
Holdings [Line Items]
Percent of Net Asset Value	0.40%
C000007066 \| Other Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000007066 \| Less than 1 Year
Holdings [Line Items]
Percent of Net Asset Value	6.10%
C000007066 \| 1 to 3 Years
Holdings [Line Items]
Percent of Net Asset Value	9.10%
C000007066 \| 3 to 5 Years
Holdings [Line Items]
Percent of Net Asset Value	10.70%
C000007066 \| 5 to 10 Years
Holdings [Line Items]
Percent of Net Asset Value	31.70%
C000007066 \| 10 to 20 Years
Holdings [Line Items]
Percent of Net Asset Value	40.40%
C000007066 \| 20 to 30 Years
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000007066 \| Greater than 30 Years
Holdings [Line Items]
Percent of Net Asset Value	0.10%
C000007067 \| Other Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000007067 \| Less than 1 Year
Holdings [Line Items]
Percent of Net Asset Value	6.10%
C000007067 \| 1 to 3 Years
Holdings [Line Items]
Percent of Net Asset Value	9.10%
C000007067 \| 3 to 5 Years
Holdings [Line Items]
Percent of Net Asset Value	10.70%
C000007067 \| 5 to 10 Years
Holdings [Line Items]
Percent of Net Asset Value	31.70%
C000007067 \| 10 to 20 Years
Holdings [Line Items]
Percent of Net Asset Value	40.40%
C000007067 \| 20 to 30 Years
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000007067 \| Greater than 30 Years
Holdings [Line Items]
Percent of Net Asset Value	0.10%
C000007068 \| Other Line
Holdings [Line Items]
Percent of Net Asset Value	0.50%
C000007068 \| Less than 1 Year
Holdings [Line Items]
Percent of Net Asset Value	7.00%
C000007068 \| 1 to 3 Years
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000007068 \| 3 to 5 Years
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000007068 \| 5 to 10 Years
Holdings [Line Items]
Percent of Net Asset Value	13.50%
C000007068 \| 10 to 20 Years
Holdings [Line Items]
Percent of Net Asset Value	35.00%
C000007068 \| 20 to 30 Years
Holdings [Line Items]
Percent of Net Asset Value	30.60%
C000007068 \| Greater than 30 Years
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000007069 \| Other Line
Holdings [Line Items]
Percent of Net Asset Value	0.50%
C000007069 \| Less than 1 Year
Holdings [Line Items]
Percent of Net Asset Value	7.00%
C000007069 \| 1 to 3 Years
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000007069 \| 3 to 5 Years
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000007069 \| 5 to 10 Years
Holdings [Line Items]
Percent of Net Asset Value	13.50%
C000007069 \| 10 to 20 Years
Holdings [Line Items]
Percent of Net Asset Value	35.00%
C000007069 \| 20 to 30 Years
Holdings [Line Items]
Percent of Net Asset Value	30.60%
C000007069 \| Greater than 30 Years
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000247741 \| Other Line
Holdings [Line Items]
Percent of Net Asset Value	0.30%
C000247741 \| Less than 1 Year
Holdings [Line Items]
Percent of Net Asset Value	5.90%
C000247741 \| 1 to 3 Years
Holdings [Line Items]
Percent of Net Asset Value	8.50%
C000247741 \| 3 to 5 Years
Holdings [Line Items]
Percent of Net Asset Value	8.70%
C000247741 \| 5 to 10 Years
Holdings [Line Items]
Percent of Net Asset Value	21.40%
C000247741 \| 10 to 20 Years
Holdings [Line Items]
Percent of Net Asset Value	30.10%
C000247741 \| 20 to 30 Years
Holdings [Line Items]
Percent of Net Asset Value	23.80%
C000247741 \| Greater than 30 Years
Holdings [Line Items]
Percent of Net Asset Value	1.30%

Shareholder Report, Holdings (Details)

May 31, 2026