Shareholder Report, Holdings (Details)	Aug. 31, 2025
C000005542 \| New Jersey
Holdings [Line Items]
Percent of Net Asset Value	87.00%
C000005542 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	5.50%
C000005542 \| New York
Holdings [Line Items]
Percent of Net Asset Value	5.00%
C000005542 \| Pennsylvania
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000005542 \| Guam
Holdings [Line Items]
Percent of Net Asset Value	0.40%
C000005542 \| Delaware
Holdings [Line Items]
Percent of Net Asset Value	0.30%
C000005542 \| Other Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000005542 \| Ground Transportation Revenue
Holdings [Line Items]
Percent of Net Asset Value	19.70%
C000005542 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	16.00%
C000005542 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	14.30%
C000005542 \| Lease Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.50%
C000005542 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	10.90%
C000005542 \| General Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	8.50%
C000005542 \| Dedicated Tax Revenue
Holdings [Line Items]
Percent of Net Asset Value	5.10%
C000005542 \| Pre-Refunded
Holdings [Line Items]
Percent of Net Asset Value	2.60%
C000005542 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000005542 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	8.90%
C000193181 \| New Jersey
Holdings [Line Items]
Percent of Net Asset Value	87.00%
C000193181 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	5.50%
C000193181 \| New York
Holdings [Line Items]
Percent of Net Asset Value	5.00%
C000193181 \| Pennsylvania
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000193181 \| Guam
Holdings [Line Items]
Percent of Net Asset Value	0.40%
C000193181 \| Delaware
Holdings [Line Items]
Percent of Net Asset Value	0.30%
C000193181 \| Other Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000193181 \| Ground Transportation Revenue
Holdings [Line Items]
Percent of Net Asset Value	19.70%
C000193181 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	16.00%
C000193181 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	14.30%
C000193181 \| Lease Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.50%
C000193181 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	10.90%
C000193181 \| General Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	8.50%
C000193181 \| Dedicated Tax Revenue
Holdings [Line Items]
Percent of Net Asset Value	5.10%
C000193181 \| Pre-Refunded
Holdings [Line Items]
Percent of Net Asset Value	2.60%
C000193181 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000193181 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	8.90%