010000 - Document - Document and Entity Information {Elements}
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020102 - Disclosure - Risk/Return Detail Data (MFS Alabama Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020104 - Disclosure - Risk/Return Detail Data (MFS Arkansas Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020106 - Disclosure - Risk/Return Detail Data (MFS California Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020108 - Disclosure - Risk/Return Detail Data (MFS Georgia Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020110 - Disclosure - Risk/Return Detail Data (MFS Maryland Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020112 - Disclosure - Risk/Return Detail Data (MFS Massachusetts Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020114 - Disclosure - Risk/Return Detail Data (MFS Mississippi Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020116 - Disclosure - Risk/Return Detail Data (MFS Municipal Income Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020118 - Disclosure - Risk/Return Detail Data (MFS Municipal Income Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020120 - Disclosure - Risk/Return Detail Data (MFS Municipal Intermediate Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020122 - Disclosure - Risk/Return Detail Data (MFS New York Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020124 - Disclosure - Risk/Return Detail Data (MFS North Carolina Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020126 - Disclosure - Risk/Return Detail Data (MFS Pennsylvania Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020128 - Disclosure - Risk/Return Detail Data (MFS South Carolina Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020130 - Disclosure - Risk/Return Detail Data (MFS Virginia Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020132 - Disclosure - Risk/Return Detail Data (MFS West Virginia Municipal Bond Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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010004 - Schedule - Investment Risks {Unlabeled}
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