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Label Element Value
[RiskReturnAbstract] rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2013
Registrant Name dei_EntityRegistrantName Eaton Vance Special Investment Trust
Central Index Key dei_EntityCentralIndexKey 0000031266
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jul. 10, 2014
Document Effective Date dei_DocumentEffectiveDate Jul. 10, 2014
Prospectus Date rr_ProspectusDate Jul. 01, 2014
Eaton Vance Large-Cap Growth Fund
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Supplement [Text Block] evsit_SupplementTextBlock

EATON VANCE BALANCED FUND
EATON VANCE DIVIDEND BUILDER FUND
EATON VANCE LARGE-CAP CORE RESEARCH FUND
EATON VANCE LARGE-CAP GROWTH FUND
EATON VANCE LARGE-CAP VALUE FUND
EATON VANCE REAL ESTATE FUND
EATON VANCE SMALL-CAP FUND
EATON VANCE SMALL-CAP VALUE FUND
EATON VANCE SPECIAL EQUITIES FUND

Supplement to Prospectus dated May 1, 2014, as revised July 1, 2014

The following replaces “Fees and Expenses of the Fund” under “Fund Summaries – Eaton Vance Large-Cap Growth Fund”:

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds. More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 54 of this Prospectus and page 25 of the Fund’s Statement of Additional Information.

         
Shareholder Fees (fees paid directly from your investment) Class A Class C Class I Class R
Maximum Sales Charge (Load) (as a percentage of offering price) 5.75% None None None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) None 1.00% None None

 

         
Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)(1) Class A Class C Class I Class R
Management Fees 0.80% 0.80% 0.80% 0.80%
Distribution and Service (12b-1) Fees 0.25% 1.00% n/a 0.50%
Other Expenses 0.30% 0.30% 0.30% 0.30%
Total Annual Fund Operating Expenses 1.35% 2.10% 1.10% 1.60%
Expense Reimbursement(2) (0.30)% (0.30)% (0.30)% (0.30)%
Total Annual Fund Operating Expenses After Expense Reimbursement 1.05% 1.80% 0.80% 1.30%

(1)

Expenses in the table above and the Example below reflect the expenses of the Fund and the Large-Cap Growth Portfolio (the “Portfolio”), the Fund’s master Portfolio.

(2)

The administrator has agreed to reimburse the Fund’s expenses to the extent that Total Annual Fund Operating Expenses exceed 1.05% for Class A shares, 1.80% for Class C shares, 0.80% for Class I shares and 1.30% for Class R shares. This expense reimbursement will continue through April 30, 2015. Any amendment to or a termination of this reimbursement would require written approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses of unaffiliated funds, interest expense, taxes or litigation expenses. Amounts reimbursed may be recouped by the administrator during the Fund’s current fiscal year to the extent actual expenses are less than the contractual expense cap during such year.

Example. 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 then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

                 
  Expenses with Redemption Expenses without Redemption
  1 Year 3 Years 5 Years 10 Years 1 Year 3 Years 5 Years 10 Years
Class A shares $676 $950 $1,245 $2,081 $676 $950 $1,245 $2,081
Class C shares $283 $629 $1,101 $2,407 $183 $629 $1,101 $2,407
Class I shares $82 $320 $577 $1,313 $82 $320 $577 $1,313
Class R shares $132 $476 $843 $1,875 $132 $476 $843 $1,875

 

   
July 10, 2014 15354 7.10.14

 

 
Eaton Vance Large-Cap Growth Fund | Class A
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EALCX
Maximum Sales Charge (Load) (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.30%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.35%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.30%)
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 676
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 950
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,245
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,081
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 676
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 950
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,245
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,081
Eaton Vance Large-Cap Growth Fund | Class C
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol ECLCX
Maximum Sales Charge (Load) (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.30%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.10%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.30%)
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 283
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 629
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,101
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,407
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 183
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 629
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,101
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,407
Eaton Vance Large-Cap Growth Fund | Class I
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol ELCIX
Maximum Sales Charge (Load) (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.30%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.10%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.30%)
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 320
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 577
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,313
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 82
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 320
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 577
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,313
Eaton Vance Large-Cap Growth Fund | Class R
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol ELCRX
Maximum Sales Charge (Load) (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.30%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.60%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.30%)
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 476
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 843
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,875
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 132
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 476
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 843
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,875