000001 - Document - Document and Entity Information
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020000 - Document - Risk/Return Summary {Unlabeled} - MFS Diversified Income Fund
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020001 - Schedule - Shareholder Fees
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020002 - Schedule - Annual Fund Operating Expenses
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020003 - Schedule - Expense Example {Transposed}
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020004 - Schedule - Expense Example No Redemption {Transposed}
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020005 - Schedule - Annual Total Returns [Bar Chart]
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020006 - Schedule - Average Annual Returns {Transposed}
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020008 - Document - Risk/Return Summary {Unlabeled} - MFS Global Real Estate Fund
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020009 - Schedule - Shareholder Fees
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020010 - Schedule - Annual Fund Operating Expenses
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020011 - Schedule - Expense Example {Transposed}
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020012 - Schedule - Expense Example No Redemption {Transposed}
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020013 - Schedule - Annual Total Returns [Bar Chart]
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020014 - Schedule - Average Annual Returns {Transposed}
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020016 - Document - Risk/Return Summary {Unlabeled} - MFS Government Securities Fund
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020017 - Schedule - Shareholder Fees
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020018 - Schedule - Annual Fund Operating Expenses
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020019 - Schedule - Expense Example {Transposed}
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020020 - Schedule - Expense Example No Redemption {Transposed}
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020021 - Schedule - Annual Total Returns [Bar Chart]
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020022 - Schedule - Average Annual Returns {Transposed}
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020024 - Document - Risk/Return Summary {Unlabeled} - MFS New Discovery Value Fund
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020025 - Schedule - Shareholder Fees
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020026 - Schedule - Annual Fund Operating Expenses
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020027 - Schedule - Expense Example {Transposed}
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020028 - Schedule - Expense Example No Redemption {Transposed}
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020029 - Schedule - Annual Total Returns [Bar Chart]
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020030 - Schedule - Average Annual Returns {Transposed}
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020007 - Disclosure - Risk/Return Detail Data {Elements} - MFS Diversified Income Fund
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020015 - Disclosure - Risk/Return Detail Data {Elements} - MFS Global Real Estate Fund
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020023 - Disclosure - Risk/Return Detail Data {Elements} - MFS Government Securities Fund
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020031 - Disclosure - Risk/Return Detail Data {Elements} - MFS New Discovery Value Fund
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