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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Feb. 28, 2012
MFS Diversified Target Return Fund (Prospectus Summary): | MFS Diversified Target Return Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading MFS® Diversified Target Return Fund  
Supplement Text ck0000764719_SupplementTextBlock

SUPPLEMENT TO PROSPECTUS

The date of this supplement is May 30, 2012

 

MFS® Diversified Target Return Fund

 

 

The class ticker symbol chart on the front cover page is restated in its entirety as follows:

 

 

CLASS

TICKER SYMBOL

Class A

DVRAX

Class B

DVRBX

Class C

DVRCX

Class I

DVRIX

Class R1

DVRFX

Class R2

DVRHX

Class R3

DVRJX

Class R4

DVRKX

Class R5 (Formerly Class W)

DVRLX

 

The sub-sections entitled “Fees and Expenses” and “Example” beneath the main heading "Summary of Key Information" are restated in their entirety as follows:

 
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2014-02-28  
Expense Breakpoint, Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales charge reductions if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in MFS Funds.
Expense, Heading rr_ExpenseHeading Fees and Expenses  
Expense Breakpoint, Minimum Investment Required Amount rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 50,000
Expense, Narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay when you buy and hold shares of the fund. Expenses have been adjusted to reflect current fee arrangements.

 

You may qualify for sales charge reductions if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in MFS Funds. More information about these and other waivers and reductions is available from your financial intermediary and in “Sales Charges and Waivers or Reductions” on page 10 of the fund’s prospectus and “Waivers of Sales Charges” on page I-14 of the fund’s statement of additional information Part I.

 
Shareholder Fees, Caption rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):  
Operating Expenses, Caption rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):  
Expenses, Restated to Reflect Current rr_ExpensesRestatedToReflectCurrent Expenses have been adjusted to reflect current fee arrangements.
Expense Example, Heading rr_ExpenseExampleHeading Example  
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.

 

The example assumes that: you invest $10,000 in the fund for the time periods indicated and you redeem your shares at the end of the time periods (unless otherwise indicated); your investment has a 5% return each year; and the fund’s operating expenses remain the same.

 
Expense Example, By Year, Caption rr_ExpenseExampleByYearCaption Although your actual costs will likely be higher or lower, under these assumptions your costs would be:  
BarChartAndPerformanceTableSubHeading ck0000764719_Barchartandperformancetablesubheading

The fourth paragraph as well as the Performance Table under the sub-section entitled "Performance Information" beneath the main heading "Summary of Key Information" are restated in their entirety as follows:

 
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes
Bar Chart, Closing rr_BarChartClosingTextBlock

The total return for the three-month period ended March 31, 2012 was 4.36%. During the period(s) shown in the bar chart, the highest quarterly return was 14.02% (for the calendar quarter ended June 30, 2009) and the lowest quarterly return was (15.58)% (for the calendar quarter ended December 31, 2008).

 
Performance Table, Heading rr_PerformanceTableHeading Performance Table.  
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the Periods Ended December 31, 2011)  
MFS Diversified Target Return Fund | A
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DVRAX
Shareholder Fees, Column Name rr_ShareholderFeesColumnName A
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [1]
Operating Expenses, Column Name rr_OperatingExpensesColumnName A
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.88%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.03%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.63%) [2]
Total Annual FundOperating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.40%
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class A Shares
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 709
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 1,072
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,507
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,712
Year to Date Return, Label rr_YearToDateReturnLabel The total return for the three-month period ended
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 4.36%
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.58%)
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.02%
Average Annual Returns, Label rr_AverageAnnualReturnLabel A Shares Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (5.08%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (1.77%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | A | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel A Shares Returns After Taxes On Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (5.51%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (2.93%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | A | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel A Shares Returns After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.74%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (1.83%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | B
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DVRBX
Shareholder Fees, Column Name rr_ShareholderFeesColumnName B
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice 4.00%
Operating Expenses, Column Name rr_OperatingExpensesColumnName B
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.88%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.78%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.63%) [2]
Total Annual FundOperating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 2.15%
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class B Shares assuming redemption at end of period
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 618
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 1,055
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,569
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,846
Expense Example, No Redemption, By Year, Column rr_ExpenseExampleNoRedemptionByYearColumnName Class B Shares assuming no redemption at end of period
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 218
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 755
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,369
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,846
Average Annual Returns, Label rr_AverageAnnualReturnLabel B Shares Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (3.97%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (1.57%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | I
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DVRIX
Shareholder Fees, Column Name rr_ShareholderFeesColumnName I
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Operating Expenses, Column Name rr_OperatingExpensesColumnName I
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.88%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.78%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.63%) [2]
Total Annual FundOperating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.15%
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class I Shares
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 117
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 450
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 859
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,001
Average Annual Returns, Label rr_AverageAnnualReturnLabel I Shares Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.03%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (0.02%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | C
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DVRCX
Shareholder Fees, Column Name rr_ShareholderFeesColumnName C
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Operating Expenses, Column Name rr_OperatingExpensesColumnName C
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.88%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.78%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.63%) [2]
Total Annual FundOperating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 2.15%
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class C Shares assuming redemption at end of period
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 318
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 755
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,369
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 3,027
Expense Example, No Redemption, By Year, Column rr_ExpenseExampleNoRedemptionByYearColumnName Class C Shares assuming no redemption at end of period
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 218
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 755
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,369
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 3,027
Average Annual Returns, Label rr_AverageAnnualReturnLabel C Shares Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.92%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (1.01%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | R1
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DVRFX
Shareholder Fees, Column Name rr_ShareholderFeesColumnName ALL R
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Operating Expenses, Column Name rr_OperatingExpensesColumnName R1
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.88%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.78%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.63%) [2]
Total Annual FundOperating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 2.15%
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class R1 Shares
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 218
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 755
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,369
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 3,027
Average Annual Returns, Label rr_AverageAnnualReturnLabel R1 Shares Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.08%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (1.03%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | R2
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DVRHX
Shareholder Fees, Column Name rr_ShareholderFeesColumnName ALL R
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Operating Expenses, Column Name rr_OperatingExpensesColumnName R2
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.88%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.28%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.63%) [2]
Total Annual FundOperating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.65%
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class R2 Shares
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 168
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 604
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,117
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,528
Average Annual Returns, Label rr_AverageAnnualReturnLabel R2 Shares Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.49%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (0.53%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | R3
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DVRJX
Shareholder Fees, Column Name rr_ShareholderFeesColumnName ALL R
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Operating Expenses, Column Name rr_OperatingExpensesColumnName R3
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.88%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.03%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.63%) [2]
Total Annual FundOperating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.40%
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class R3 Shares
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 143
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 527
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 989
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,268
Average Annual Returns, Label rr_AverageAnnualReturnLabel R3 Shares Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.68%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (0.29%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | R4
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DVRKX
Shareholder Fees, Column Name rr_ShareholderFeesColumnName ALL R
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Operating Expenses, Column Name rr_OperatingExpensesColumnName R4
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.88%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.78%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.63%) [2]
Total Annual FundOperating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.15%
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class R4 Shares
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 117
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 450
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 859
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,001
Average Annual Returns, Label rr_AverageAnnualReturnLabel R4 Shares Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.92%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (0.02%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | R5
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DVRLX
Shareholder Fees, Column Name rr_ShareholderFeesColumnName ALL R
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Operating Expenses, Column Name rr_OperatingExpensesColumnName R5
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.79%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.69%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.62%) [2]
Total Annual FundOperating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.07%
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class R5 Shares
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 109
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 424
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 813
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,905
Average Annual Returns, Label rr_AverageAnnualReturnLabel R5 Shares Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.06%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (0.07%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
MFS Diversified Target Return Fund | Index Comparison (Reflects no deduction for fees, expenses or taxes) Barclays Capital 1-3 Year U.S. Treasury Bond Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Index Comparison (Reflects no deduction for fees, expenses or taxes) Barclays Capital 1-3 Year U.S. Treasury Bond Index
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.55%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.85%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2007
[1] On shares purchased without an initial sales charge and redeemed within 24 months of purchase.
[2] MFS has agreed in writing to bear the fund’s expenses, excluding interest, taxes, extraordinary expenses, brokerage and transaction costs and investment-related expenses (such as interest and borrowing expenses incurred in connection with the fund's investment activity), such that "Total Annual Fund Operating Expenses" do not exceed 1.40% of the fund’s average daily net assets annually for each of Class A and Class R3 shares, 2.15% of the fund’s average daily net assets annually for each of Class B, Class C, and Class R1 shares, 1.65% of the fund’s average daily net assets annually for Class R2 shares, 1.15% of the fund’s average daily net assets annually for each of Class I and Class R4 shares, and 1.07% of the fund’s average daily net assets annually for Class R5 shares. This written agreement will continue until modified by the fund’s Board of Trustees, but such agreement will continue until at least February 28, 2014.