010000 - Document - Document and Entity Information {Elements}
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020102 - Disclosure - Risk/Return Detail Data (MFS Aggressive Growth Allocation Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020104 - Disclosure - Risk/Return Detail Data (MFS Blended Research Growth Equity Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020106 - Disclosure - Risk/Return Detail Data (MFS Blended Research Small Cap Equity Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020108 - Disclosure - Risk/Return Detail Data (MFS Blended Research Mid Cap Equity Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020110 - Disclosure - Risk/Return Detail Data (MFS Blended Research Value Equity Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020112 - Disclosure - Risk/Return Detail Data (MFS Conservative Allocation Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020114 - Disclosure - Risk/Return Detail Data (MFS Emerging Markets Equity Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020116 - Disclosure - Risk/Return Detail Data (MFS Growth Allocation Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020118 - Disclosure - Risk/Return Detail Data (MFS International Diversification Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020120 - Disclosure - Risk/Return Detail Data (MFS International Growth Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020122 - Disclosure - Risk/Return Detail Data (MFS International Intrinsic Equity Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020124 - Disclosure - Risk/Return Detail Data (MFS International Value Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020126 - Disclosure - Risk/Return Detail Data (MFS Managed Wealth Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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020128 - Disclosure - Risk/Return Detail Data (MFS Moderate Allocation Fund) {Elements}
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020101 - Schedule - Risk Table {Transposed}
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010004 - Schedule - Investment Risks {Unlabeled}
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