Shareholder Report, Line Graph (Details) - USD ($)	12 Months Ended	60 Months Ended	96 Months Ended	108 Months Ended	132 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
C000019665_0_LG_BBIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Municipal Bond Index</span>
C000019665_0_BBIndexMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	$ 10,000
C000019665_0_BBIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	10,025
C000019665_0_BBIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,571
C000019665_0_BBIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,707
C000019665_0_BBIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,513
C000019665_0_BBIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	12,113
C000019665_0_BBIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	12,297
C000019665_0_BBIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,249
C000019665_0_BBIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,969
C000019665_0_BBIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	12,095
C000019665_0_BBIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	12,608
C000205053_0_LG_BBIndexMember_8YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Municipal Bond Index</span>
C000205053_0_BBIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,000
C000205053_0_BBIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	10,167
C000205053_0_BBIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	10,933
C000205053_0_BBIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	11,503
C000205053_0_BBIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,678
C000205053_0_BBIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	10,682
C000205053_0_BBIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,366
C000205053_0_BBIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,486
C000019669_0_LG_BBIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Municipal Bond Index</span>
C000019669_0_BBIndexMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	10,000
C000019669_0_BBIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	10,025
C000019669_0_BBIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,571
C000019669_0_BBIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,707
C000019669_0_BBIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,513
C000019669_0_BBIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	12,113
C000019669_0_BBIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	12,297
C000019669_0_BBIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,249
C000019669_0_BBIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,969
C000019669_0_BBIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	12,095
C000019669_0_BBIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	12,608
C000019670_0_LG_BBIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Municipal Bond Index</span>
C000019670_0_BBIndexMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	10,000
C000019670_0_BBIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	10,025
C000019670_0_BBIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,571
C000019670_0_BBIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,707
C000019670_0_BBIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,513
C000019670_0_BBIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	12,113
C000019670_0_BBIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	12,297
C000019670_0_BBIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,249
C000019670_0_BBIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,969
C000019670_0_BBIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	12,095
C000019670_0_BBIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	12,608
C000019668_0_LG_BBIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Municipal Bond Index</span>
C000019668_0_BBIndexMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	10,000
C000019668_0_BBIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	10,025
C000019668_0_BBIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,571
C000019668_0_BBIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,707
C000019668_0_BBIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,513
C000019668_0_BBIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	12,113
C000019668_0_BBIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	12,297
C000019668_0_BBIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,249
C000019668_0_BBIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,969
C000019668_0_BBIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	12,095
C000019668_0_BBIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	12,608
C000019666_0_LG_BBIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Municipal Bond Index</span>
C000019666_0_BBIndexMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	10,000
C000019666_0_BBIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	10,025
C000019666_0_BBIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,571
C000019666_0_BBIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,707
C000019666_0_BBIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,513
C000019666_0_BBIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	12,113
C000019666_0_BBIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	12,297
C000019666_0_BBIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,249
C000019666_0_BBIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,969
C000019666_0_BBIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	12,095
C000019666_0_BBIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	12,608
C000229122_LG_ClassMember_5YRMember
Account Value [Line Items]
Line Graph and Table Measure Name		<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series International Developed Markets Bond Index Fund</span>
C000229122_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	10,000
C000229122_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	9,838
C000229122_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	8,482
C000229122_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	9,159
C000229122_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	9,426
C000229122_LG_1_AdditionalIndexMember_5YRMember
Account Value [Line Items]
Line Graph and Table Measure Name		<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Global Aggregate Treasury ex USD, ex Emerging Markets, RIC Capped, Float Adjusted Index (Hedged USD)</span>
C000229122_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	10,000
C000229122_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	9,872
C000229122_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	8,508
C000229122_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	9,214
C000229122_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	9,486
C000229122_LG_2_AdditionalIndexMember_5YRMember
Account Value [Line Items]
Line Graph and Table Measure Name		<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Global Aggregate Bond Index</span>
C000229122_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	10,000
C000229122_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	9,756
C000229122_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	8,171
C000229122_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	8,638
C000229122_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	8,492
C000190811_LG_ClassMember_9YRMember
Account Value [Line Items]
Line Graph and Table Measure Name				<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series International Credit Fund</span>
C000190811_ClassMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,000
C000190811_ClassMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,191
C000190811_ClassMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	10,085
C000190811_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	11,483
C000190811_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	12,439
C000190811_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	12,431
C000190811_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	10,262
C000190811_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,060
C000190811_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,997
C000190811_LG_1_AdditionalIndexMember_9YRMember
Account Value [Line Items]
Line Graph and Table Measure Name				<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Global Aggregate Credit Ex U.S. Index (Hedged USD)</span>
C000190811_1_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,000
C000190811_1_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,176
C000190811_1_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	10,243
C000190811_1_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	11,294
C000190811_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	12,021
C000190811_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,906
C000190811_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	10,349
C000190811_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,250
C000190811_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,749
C000190811_LG_2_AdditionalIndexMember_9YRMember
Account Value [Line Items]
Line Graph and Table Measure Name				<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Global Aggregate Bond Index</span>
C000190811_2_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,000
C000190811_2_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,183
C000190811_2_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	10,061
C000190811_2_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	10,749
C000190811_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	11,737
C000190811_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,185
C000190811_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	9,367
C000190811_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	9,903
C000190811_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	9,736
C000019665_LG_ClassMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Intermediate Municipal Income Fund</span>
C000019665_ClassMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	10,000
C000019665_ClassMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	9,999
C000019665_ClassMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,447
C000019665_ClassMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,572
C000019665_ClassMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,264
C000019665_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	11,775
C000019665_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	11,909
C000019665_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,162
C000019665_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,777
C000019665_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,939
C000019665_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	12,540
C000019665_LG_1_AdditionalIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg 3-15 Year Blend (2-17) Municipal Bond Index</span>
C000019665_1_AdditionalIndexMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	10,000
C000019665_1_AdditionalIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	9,995
C000019665_1_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,470
C000019665_1_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,631
C000019665_1_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,357
C000019665_1_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	11,930
C000019665_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	12,041
C000019665_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,267
C000019665_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,881
C000019665_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,965
C000019665_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	12,600
C000019665_LG_2_AdditionalIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Intermediate Municipal Income Linked Index℠</span>
C000019665_2_AdditionalIndexMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	10,000
C000019665_2_AdditionalIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	10,001
C000019665_2_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,434
C000019665_2_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,599
C000019665_2_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,281
C000019665_2_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	11,815
C000019665_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	11,917
C000019665_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,209
C000019665_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,798
C000019665_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,897
C000019665_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	12,528
C000205053_LG_ClassMember_8YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span>
C000205053_ClassMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,000
C000205053_ClassMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	10,154
C000205053_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	10,823
C000205053_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	11,320
C000205053_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,454
C000205053_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	10,744
C000205053_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,341
C000205053_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,504
C000205053_LG_1_AdditionalIndexMember_8YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg 3-15 Year Blend (2-17) Municipal Bond Index</span>
C000205053_1_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,000
C000205053_1_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	10,179
C000205053_1_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	10,873
C000205053_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	11,422
C000205053_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,528
C000205053_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	10,788
C000205053_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,375
C000205053_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,456
C000205053_LG_2_AdditionalIndexMember_8YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Intermediate Municipal Income Linked Index℠</span>
C000205053_2_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,000
C000205053_2_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	10,169
C000205053_2_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	10,824
C000205053_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	11,336
C000205053_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	11,434
C000205053_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	10,754
C000205053_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,320
C000205053_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,415
C000019669_LG_ClassMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span>
C000019669_ClassMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	9,600
C000019669_ClassMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	9,571
C000019669_ClassMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	9,970
C000019669_ClassMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,062
C000019669_ClassMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	10,689
C000019669_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	11,142
C000019669_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	11,237
C000019669_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	10,505
C000019669_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,053
C000019669_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	11,174
C000019669_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,704
C000019669_LG_1_AdditionalIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg 3-15 Year Blend (2-17) Municipal Bond Index</span>
C000019669_1_AdditionalIndexMember_AsOf_2015Member
Account Value [Line Items]
Accumulated Value	10,000
C000019669_1_AdditionalIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	9,995
C000019669_1_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,470
C000019669_1_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,631
C000019669_1_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
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C000019669_1_AdditionalIndexMember_AsOf_2020Member
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