v3.26.1
Shareholder Report, Holdings (Details)
Feb. 28, 2026
C000017636 | Southeast Alabama, Energy Authority9197889  
Holdings [Line Items]  
Percent of Total Investments 0.70%
C000017636 | Wisconsin State, Public Finance Authority9197582  
Holdings [Line Items]  
Percent of Total Investments 0.70%
C000017636 | New Jersey State, Tobacco Settlement Financing9197977  
Holdings [Line Items]  
Percent of Total Investments 0.70%
C000017636 | Massachusetts State, Development Finance Agency9196565  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000017636 | Pennsylvania State, Economic Development Financing Authority9198515  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000017636 | Atlanta, Water & Wastewater Revenue Authority9196261  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000017636 | Virginia State, Tobacco Settlement Financing9197980  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000017636 | Puerto Rico, Sales Tax Financing, Sales Tax Revenue9196174  
Holdings [Line Items]  
Percent of Total Investments 0.50%
C000017636 | Southeast Alabama, Energy Authority9197287  
Holdings [Line Items]  
Percent of Total Investments 0.50%
C000017636 | Texas State, Municipal Gas Acquisition & Supply IV9197959  
Holdings [Line Items]  
Percent of Total Investments 0.50%
C000147417 | Southeast Alabama, Energy Authority9197889  
Holdings [Line Items]  
Percent of Total Investments 0.70%
C000147417 | Wisconsin State, Public Finance Authority9197582  
Holdings [Line Items]  
Percent of Total Investments 0.70%
C000147417 | New Jersey State, Tobacco Settlement Financing9197977  
Holdings [Line Items]  
Percent of Total Investments 0.70%
C000147417 | Massachusetts State, Development Finance Agency9196565  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000147417 | Pennsylvania State, Economic Development Financing Authority9198515  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000147417 | Atlanta, Water & Wastewater Revenue Authority9196261  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000147417 | Virginia State, Tobacco Settlement Financing9197980  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000147417 | Puerto Rico, Sales Tax Financing, Sales Tax Revenue9196174  
Holdings [Line Items]  
Percent of Total Investments 0.50%
C000147417 | Southeast Alabama, Energy Authority9197287  
Holdings [Line Items]  
Percent of Total Investments 0.50%
C000147417 | Texas State, Municipal Gas Acquisition & Supply IV9197959  
Holdings [Line Items]  
Percent of Total Investments 0.50%
C000017624 | Kentucky State, Public Energy Authority9198714  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000017624 | City of Andover Kansas9198137  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000017624 | District of Columbia9198037  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000017624 | Dallas City, Housing Finance Corporation, Multifamily Housing Revenue9198336  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000017624 | Tennergy9199310  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000017624 | Alachua County, Housing Finance Authority9198118  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000017624 | Salt Verde Financial Corp9199202  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000017624 | Southeast Alabama, Energy Authority9199248  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000017624 | Metrowest Regional Transit Authority9198858  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000017624 | Georgia State, Main Street Natural Gas9198766  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000147411 | Kentucky State, Public Energy Authority9198714  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000147411 | City of Andover Kansas9198137  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000147411 | District of Columbia9198037  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000147411 | Dallas City, Housing Finance Corporation, Multifamily Housing Revenue9198336  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000147411 | Tennergy9199310  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000147411 | Alachua County, Housing Finance Authority9198118  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000147411 | Salt Verde Financial Corp9199202  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000147411 | Southeast Alabama, Energy Authority9199248  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000147411 | Metrowest Regional Transit Authority9198858  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000147411 | Georgia State, Main Street Natural Gas9198766  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000017631 | Los Angeles, Department of Water & Power9196023  
Holdings [Line Items]  
Percent of Total Investments 3.20%
C000017631 | California State9195839  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000017631 | Los Angeles, Unified School District9196042  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000017631 | California State, Community Choice Financing Authority9195804  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000017631 | California State9195842  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000017631 | Burbank-Glendale-Pasadena Airport Authority Brick Campaign9195801  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000017631 | California State9195848  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000017631 | California State9195855  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000017631 | California State, Statewide Communities Development Authority9195983  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000017631 | California State, Health Facilities Financing Authority9195895  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000147416 | Los Angeles, Department of Water & Power9196023  
Holdings [Line Items]  
Percent of Total Investments 3.20%
C000147416 | California State9195839  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000147416 | Los Angeles, Unified School District9196042  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000147416 | California State, Community Choice Financing Authority9195804  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000147416 | California State9195842  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000147416 | Burbank-Glendale-Pasadena Airport Authority Brick Campaign9195801  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000147416 | California State9195848  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000147416 | California State9195855  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000147416 | California State, Statewide Communities Development Authority9195983  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000147416 | California State, Health Facilities Financing Authority9195895  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000017627 | Massachusetts State, Development Finance Agency9198211  
Holdings [Line Items]  
Percent of Total Investments 5.80%
C000017627 | Massachusetts State9198119  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000017627 | Massachusetts Bay, Transportation Authority9198142  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000017627 | Boston9198098  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000017627 | Massachusetts State, Development Finance Agency9198208  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000017627 | Massachusetts State, Development Finance Agency9198162  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000017627 | Massachusetts State, Development Finance Agency9198092  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000017627 | Massachusetts Development Finance Agency9198205  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000017627 | Massachusetts Development Finance Agency9198159  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000017627 | Massachusetts Bay, Transportation Authority Sales Tax Revenue9198139  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000147413 | Massachusetts State, Development Finance Agency9198211  
Holdings [Line Items]  
Percent of Total Investments 5.80%
C000147413 | Massachusetts State9198119  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000147413 | Massachusetts Bay, Transportation Authority9198142  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000147413 | Boston9198098  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000147413 | Massachusetts State, Development Finance Agency9198208  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000147413 | Massachusetts State, Development Finance Agency9198162  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000147413 | Massachusetts State, Development Finance Agency9198092  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000147413 | Massachusetts Development Finance Agency9198205  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000147413 | Massachusetts Development Finance Agency9198159  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000147413 | Massachusetts Bay, Transportation Authority Sales Tax Revenue9198139  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000017630 | Tobacco Settlement Financing9195589  
Holdings [Line Items]  
Percent of Total Investments 3.30%
C000017630 | New Jersey State, Transportation Trust Fund Authority9195522  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000017630 | New Jersey State, Transportation Trust Fund Authority9195528  
Holdings [Line Items]  
Percent of Total Investments 2.90%
C000017630 | New Jersey State, Higher Education Student Assistance Authority9195709  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000017630 | New York & New Jersey, Port Authority9195566  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000017630 | New York & New Jersey, Port Authority9195572  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000017630 | New Jersey State, Educational Facilities Authority9195702  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000017630 | New Jersey State, Health Care Facilities Financing Authority9195511  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000017630 | New Jersey State, Educational Facilities Authority9195690  
Holdings [Line Items]  
Percent of Total Investments 2.40%
C000017630 | New Jersey State9195666  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000147415 | Tobacco Settlement Financing9195589  
Holdings [Line Items]  
Percent of Total Investments 3.30%
C000147415 | New Jersey State, Transportation Trust Fund Authority9195522  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000147415 | New Jersey State, Transportation Trust Fund Authority9195528  
Holdings [Line Items]  
Percent of Total Investments 2.90%
C000147415 | New Jersey State, Higher Education Student Assistance Authority9195709  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000147415 | New York & New Jersey, Port Authority9195566  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000147415 | New York & New Jersey, Port Authority9195572  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000147415 | New Jersey State, Educational Facilities Authority9195702  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000147415 | New Jersey State, Health Care Facilities Financing Authority9195511  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000147415 | New Jersey State, Educational Facilities Authority9195690  
Holdings [Line Items]  
Percent of Total Investments 2.40%
C000147415 | New Jersey State9195666  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000017629 | New York & New Jersey, Port Authority9212884  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000017629 | Triborough, Bridge & Tunnel Authority9212888  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000017629 | New York City Transitional Finance Authority Future Tax Secured Revenue9212847  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000017629 | New York City Transitional Finance Authority Future Tax Secured Revenue9212848  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000017629 | New York City, Transitional Finance Authority9212846  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000017629 | New York State, Dormitory Authority9212870  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000017629 | Triborough, Bridge & Tunnel Authority9212889  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000017629 | Suffolk, Tobacco Asset Securitization9212887  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000017629 | New York State, Dormitory Authority9212865  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000017629 | Metropolitan Transportation Authority9212837  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000147414 | New York & New Jersey, Port Authority9212884  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000147414 | Triborough, Bridge & Tunnel Authority9212888  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000147414 | New York City Transitional Finance Authority Future Tax Secured Revenue9212847  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000147414 | New York City Transitional Finance Authority Future Tax Secured Revenue9212848  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000147414 | New York City, Transitional Finance Authority9212846  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000147414 | New York State, Dormitory Authority9212870  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000147414 | Triborough, Bridge & Tunnel Authority9212889  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000147414 | Suffolk, Tobacco Asset Securitization9212887  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000147414 | New York State, Dormitory Authority9212865  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000147414 | Metropolitan Transportation Authority9212837  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000017626 | Philadelphia, Industrial Development Authority9197694  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000017626 | Pennsylvania State9197916  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000017626 | Pennsylvania State, Higher Education Assistance Agency9197910  
Holdings [Line Items]  
Percent of Total Investments 2.40%
C000017626 | Pennsylvania State9197923  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000017626 | Philadelphia, Water & Wastewater Revenue Authority9197729  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000017626 | Philadelphia, Housing Authority9197712  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000017626 | Adams County, General Authority9197788  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000017626 | Commonwealth Financing Authority9197821  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000017626 | Allegheny County, Hospital Development Authority9197798  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000017626 | Philadelphia, Water & Wastewater Revenue Authority9197732  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000147412 | Philadelphia, Industrial Development Authority9197694  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000147412 | Pennsylvania State9197916  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000147412 | Pennsylvania State, Higher Education Assistance Agency9197910  
Holdings [Line Items]  
Percent of Total Investments 2.40%
C000147412 | Pennsylvania State9197923  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000147412 | Philadelphia, Water & Wastewater Revenue Authority9197729  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000147412 | Philadelphia, Housing Authority9197712  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000147412 | Adams County, General Authority9197788  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000147412 | Commonwealth Financing Authority9197821  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000147412 | Allegheny County, Hospital Development Authority9197798  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000147412 | Philadelphia, Water & Wastewater Revenue Authority9197732  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000047166 | United States Treasury Bill9198740  
Holdings [Line Items]  
Percent of Total Investments 1.70%
C000047166 | Puerto Rico9198648  
Holdings [Line Items]  
Percent of Total Investments 1.50%
C000047166 | Texas State, Water Development Board9199613  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000047166 | Puerto Rico, Sales Tax Financing, Sales Tax Revenue9198844  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000047166 | United States Treasury Bill9198734  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000047166 | Take Back and Exit Facility9199763  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000047166 | North Fort Bend Water Authority9199383  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000047166 | Puerto Rico, GDB Debt Recovery Authority9198693  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000047166 | M-S-R, Energy Authority9199294  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000047166 | West Virginia State, Tobacco Settlement, Finance Authority9199624  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000147418 | United States Treasury Bill9198740  
Holdings [Line Items]  
Percent of Total Investments 1.70%
C000147418 | Puerto Rico9198648  
Holdings [Line Items]  
Percent of Total Investments 1.50%
C000147418 | Texas State, Water Development Board9199613  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000147418 | Puerto Rico, Sales Tax Financing, Sales Tax Revenue9198844  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000147418 | United States Treasury Bill9198734  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000147418 | Take Back and Exit Facility9199763  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000147418 | North Fort Bend Water Authority9199383  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000147418 | Puerto Rico, GDB Debt Recovery Authority9198693  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000147418 | M-S-R, Energy Authority9199294  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000147418 | West Virginia State, Tobacco Settlement, Finance Authority9199624  
Holdings [Line Items]  
Percent of Total Investments 0.90%