2.2.0.25truefalse000021 - Document - Risk/Return Summary {Unlabeled}falsefalsetrue1falsefalseUSDtruefalse{dei_LegalEntityAxis} : S000027100 Member 1/18/2011 - 1/18/2011 USD ($) $Duration_1_18_2011_To_1_18_20113http://www.sec.gov/CIK0000356682duration2011-01-18T00:00:002011-01-18T00:00:00falsefalsecik001380786_S000027100Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin: 13.4pt 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><font style="font-family: 'Arial','sans-serif'; font-size: 18pt;" class="_mt">CALVERT AGGRESSIVE ALLOCATION FUND</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalseRisk/Return [Heading]4false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 <div class="MetaData"> <p style="margin: 0in 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><font style="font-family: 'Arial','sans-serif';" class="_mt"><b>Investment Objective</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalseObjective [Heading]5false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p >The Fund seeks long-term capital appreciation. </p></div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalseObjective, Primary [Text Block]6false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin: 6pt 0in; font-family: 'Times New Roman','serif'; font-size: 12pt;"><font style="font-family: 'Arial','sans-serif';" class="_mt"><b>Fees and Expenses of the Fund</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalseExpense [Heading]7false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p>This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Calvert non-money market mutual funds. More information about these and other discounts is available from your financial professional and under 'Choosing a Share Class' on page 84 and 'Reduced Sales Charges' on page 88 of this Prospectus, and under 'Method of Distribution' on page 49 of the Fund's Statement of Additional Information ('SAI').</p></div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalseExpense Narrative [Text Block]8false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin: 6pt 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Shareholder Fees</font></b></p> <p style="margin: 0in 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">(fees paid directly from your investment)</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalseShareholder Fees Caption [Text]9false0rr_ShareholderFeesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.calvert.com/role/ScheduleShareholderFeesCalvertHighYieldBondFund column period compact * column dei_LegalEntityAxis compact cik001380786_S000027100Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.calvert.com/role/ScheduleShareholderFeesCalvertHighYieldBondFund column period compact * column dei_LegalEntityAxis compact cik001380786_S000027100Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.calvert.com/role/ScheduleShareholderFeesCalvertHighYieldBondFundfalsefalse000022 - Schedule - Shareholder Feestruefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-18T00:00:002011-01-18T00:00:00falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081597Memberrr_ProspectusShareClassAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass AUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-18T00:00:002011-01-18T00:00:00falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081599Memberrr_ProspectusShareClassAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass CStandard0falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04750.0475falsefalsefalsetruefalse2truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalseMaximum sales charge (load) on purchases (as a % of offering price)0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04750.0475falsefalsefalsetruefalse2truetruetrue00falsefalsefalsetruefalseOthernanafalsefalseMaximum sales charge (load) on purchases (as a % of offering price)2falseRowprimaryElement*6false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[1]falsefalsefalsetruefalse2truetruetrue0.010.01[1]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalseMaximum deferred sales charge (load) (as a % of amount purchased or redeemed, whichever is lower)0rr_MaximumDeferredSalesChargeOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue00falsefalsefalsetruefalse2truetruetrue0.010.01falsefalsefalsetruefalseOthernanafalsefalseMaximum deferred sales charge (load) (as a % of amount purchased or redeemed, whichever is lower)3falseRowprimaryElement*7false0rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOtherrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0200.020falsefalsefalsetruefalse2truetruetrue0.0200.020falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Sales Charge (Load) Imposed on Reinvested Dividends[and other Distributions] (as a percentage of ____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 3 -Subsection table falsefalseRedemption fee (as a % of amount redeemed or exchanged within 30 days of purchase)0rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOthertruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0200.020falsefalsefalsetruefalse2truetruetrue0.0200.020falsefalsefalsetruefalseOthernanafalsefalseRedemption fee (as a % of amount redeemed or exchanged within 30 days of purchase)1 The contingent deferred sales charge reduces over time.23Shareholder Fees CALVERT AGGRESSIVE ALLOCATION FUNDUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ShareholderFeesData.No authoritative reference available.falsefalseShareholder Fees [Table]10false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin: 0in 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Annual Fund Operating Expenses</font></b></p><p style="margin: 0in 0in 0.85pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">(expenses that you pay each year as a % of the value of your investment)</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalseOperating Expenses Caption [Text]11false0rr_AnnualFundOperatingExpensesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.calvert.com/role/ScheduleAnnualFundOperatingExpensesCalvertHighYieldBondFund column period compact * column dei_LegalEntityAxis compact cik001380786_S000027100Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.calvert.com/role/ScheduleAnnualFundOperatingExpensesCalvertHighYieldBondFund column period compact * column dei_LegalEntityAxis compact cik001380786_S000027100Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.calvert.com/role/ScheduleAnnualFundOperatingExpensesCalvertHighYieldBondFundfalsefalse000023 - Schedule - Annual Fund Operating Expensestruefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-18T00:00:002011-01-18T00:00:00falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081597Memberrr_ProspectusShareClassAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass AUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-18T00:00:002011-01-18T00:00:00falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081599Memberrr_ProspectusShareClassAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass CStandard0falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00.0falsefalsefalsetruefalse2truetruetrue0.00.0falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalseAdvisory fee0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00.0falsefalsefalsetruefalse2truetruetrue0.00.0falsefalsefalsetruefalseOthernanafalsefalseAdvisory fee2falseRowprimaryElement*6false0rr_MaximumAccountFeeOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00150.0015falsefalsefalsetruefalse2truetruetrue0.00150.0015falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureInclude the caption "Maximum Account Fees" only if the Fund charges these fees. A Fund may omit other captions if the Fund does not charge the fees or expenses covered by the captions. Disclose account fees that may be charged to a typical investor in the Fund; fees that apply to only a limited number of shareholders based on their particular circumstances need not be disclosed. Include a caption describing the maximum account fee (e.g., "Maximum Account Maintenance Fee" or "Maximum Cash Management Fee"). State the maximum annual account fee as either a fixed dollar amount or a percentage of assets. Include in a parenthetical to the caption the basis on which any percentage is calculated. If an account fee is charged only to accounts that do not meet a certain threshold (e.g., accounts under $5)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 6 -Subsection table falsefalseAdministrative fees0rr_MaximumAccountFeeOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00150.0015falsefalsefalsetruefalse2truetruetrue0.00150.0015falsefalsefalsetruefalseOthernanafalsefalseAdministrative fees3falseRowprimaryElement*7false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025falsefalsefalsetruefalse2truetruetrue0.010.01falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalseDistribution and service (12b-1) fees0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025falsefalsefalsetruefalse2truetruetrue0.010.01falsefalsefalsetruefalseOthernanafalsefalseDistribution and service (12b-1) fees4falseRowprimaryElement*8false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00520.0052falsefalsefalsetruefalse2truetruetrue0.00620.0062falsefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalseOther expenses0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00520.0052falsefalsefalsetruefalse2truetruetrue0.00620.0062falsefalsefalsetruefalseOthernanafalsefalseOther expenses5falseRowprimaryElement*9false0rr_AcquiredFundFeesAndExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00840.0084falsefalsefalsetruefalse2truetruetrue0.00840.0084falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalseAcquired fund fees and expenses0rr_AcquiredFundFeesAndExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00840.0084falsefalsefalsetruefalse2truetruetrue0.00840.0084falsefalsefalsetruefalseOthernanafalsefalseAcquired fund fees and expenses6falseRowprimaryElement*10false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.01760.0176falsefalsefalsetruefalse2truetruetrue0.02610.0261falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions truefalseTotal annual fund operating expenses0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01760.0176falsefalsefalsetruefalse2truetruetrue0.02610.0261falsefalsefalsetruefalseOthernanafalsefalseTotal annual fund operating expenses7falseRowprimaryElement*11false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0049-0.0049[1]falsefalsefalsetruefalse2falsetruetrue00falsefalsefalsetruefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalseLess fee waiver and/or expense reimbursement0rr_FeeWaiverOrReimbursementOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue-0.0049-0.0049falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsefalsefalseOthernanafalsefalseLess fee waiver and/or expense reimbursement8falseRowprimaryElement*12false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.01270.0127falsefalsefalsetruefalse2falsetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table truefalseNet annual fund operating expenses0rr_NetExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01270.0127falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsefalsefalseOthernanafalsefalseNet annual fund operating expenses1 Calvert has agreed to contractually limit direct ordinary operating expenses through January 31, 2012. This expense limitation does not limit the Acquired Fund Fees and Expenses paid indirectly by a shareholder. Direct ordinary operating expenses will not exceed 0.43% for Class A and 2.00% for Class C. Only the Board of Trustees of the Fund may terminate the Fund's expense cap before the contractual period expires.28Annual Fund Operating Expenses CALVERT AGGRESSIVE ALLOCATION FUNDUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalseAnnual Fund Operating Expenses [Table]12false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 <p></p> <p></p> <p></p> <div class="MetaData"> <p style="margin: 0in 0in 6pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Example</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseExpense Example [Heading]13false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p> </p> <p> 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:</p> <p> :you invest $10,000 in the Fund for the time periods indicated and then either sell or hold your shares at the end of those periods; </p> <p> :your investment has a 5% return each year;</p> <p> :the Fund's operating expenses remain the same;</p> <p> :any Calvert expense limitation is in effect for the period indicated in the fee table above; and</p> <p> :the estimated gross expenses of the underlying Calvert funds (or net expenses if subject to an expense limit for at least a year) are incorporated.</p> <p> Although your actual costs may be higher or lower, under these assumptions your costs would be:</p> <p> </p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalseExpense Example Narrative [Text Block]14false0rr_ExpenseExampleByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 <div class="MetaData"> <p style="margin: 0in 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Number of Years Investment is Held</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseExpense Example by, Year, Caption [Text]15false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.calvert.com/role/ScheduleExpenseExampleTransposedCalvertHighYieldBondFund row period compact * row dei_LegalEntityAxis compact cik001380786_S000027100Member row rr_ProspectusShareClassAxis compact * column primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.calvert.com/role/ScheduleExpenseExampleTransposedCalvertHighYieldBondFund row period compact * row dei_LegalEntityAxis compact cik001380786_S000027100Member row rr_ProspectusShareClassAxis compact * column primary compact * ~&lt;/div&gt; </div>truehttp://www.calvert.com/role/ScheduleExpenseExampleTransposedCalvertHighYieldBondFundfalsefalse000024 - Schedule - Expense Example {Transposed}truefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-01-18T00:00:002011-01-18T00:00:00falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081597Memberrr_ProspectusShareClassAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass AfalseUSDfalsefalse$2falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-01-18T00:00:002011-01-18T00:00:00falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass C - Soldrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081603Memberrr_ProspectusShareClassAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass C - SoldfalseUSDfalsefalse$3falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-01-18T00:00:002011-01-18T00:00:00falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass C - Heldrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081604Memberrr_ProspectusShareClassAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass C - HeldfalseUSDfalsefalse$1falseRowprimaryElement*RowunitUnit*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue598598falsefalsefalsetruefalse2truefalsetrue364364falsefalsefalsetruefalse3truefalsetrue264264falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse1 YearUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700rr_ExpenseExampleYear01truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue598598falsefalsefalsetruefalse2truefalsetrue364364falsefalsefalsetruefalse3truefalsetrue264264falsefalsefalsetruefalseOthernanafalsefalse1 Year2falseRowprimaryElement*RowunitUnit*6false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue957957falsefalsefalsetruefalse2truefalsetrue811811falsefalsefalsetruefalse3truefalsetrue811811falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse3 YearsUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700rr_ExpenseExampleYear03truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue957957falsefalsefalsetruefalse2truefalsetrue811811falsefalsefalsetruefalse3truefalsetrue811811falsefalsefalsetruefalseOthernanafalsefalse3 Years3falseRowprimaryElement*RowunitUnit*7false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue13401340falsefalsefalsetruefalse2truefalsetrue13851385falsefalsefalsetruefalse3truefalsetrue13851385falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse5 YearsUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700rr_ExpenseExampleYear05truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue13401340falsefalsefalsetruefalse2truefalsetrue13851385falsefalsefalsetruefalse3truefalsetrue13851385falsefalsefalsetruefalseOthernanafalsefalse5 Years4falseRowprimaryElement*RowunitUnit*8false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue24112411falsefalsefalsetruefalse2truefalsetrue29442944falsefalsefalsetruefalse3truefalsetrue29442944falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse10 YearsUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700rr_ExpenseExampleYear10truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue24112411falsefalsefalsetruefalse2truefalsetrue29442944falsefalsefalsetruefalse3truefalsetrue29442944falsefalsefalsetruefalseOthernanafalsefalse10 Years34Expense Example CALVERT AGGRESSIVE ALLOCATION FUND (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001380786_S000027100MemberColumnrr_ProspectusShareClassAxisAxis*RowprimaryElement*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No authoritative reference available.falsefalseExpense Example, With Redemption [Table]16false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin: 0in 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt"></font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseExpense Example, No Redemption, By Year, Caption [Text]17false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin: 0in 0in 6pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Portfolio Turnover</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalsePortfolio Turnover [Heading]18false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p>The Fund may pay transaction costs, such as commissions, when it buys and sells securities ('turns over' its portfolio). These transaction costs are also incurred by the underlying Calvert funds. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the 'Example', affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 8% of its portfolio's average value </p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalsePortfolio Turnover [Text Block]19false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 <div class="MetaData"> <p style="margin: 0in 0in 6pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><font style="font-family: 'Arial','sans-serif';" class="_mt"><b>INVESTMENTS, RISKS AND PERFORMANCE</b></font></p></div> <div class="MetaData"> <p style="margin: 0in 0in 6pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><font style="font-family: 'Arial','sans-serif';" class="_mt"><b>Principal Investment Strategies</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalseStrategy [Heading]20false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div><p> </p><p> The Fund is a 'fund of funds' that seeks to achieve its investment objective by investing in a portfolio of underlying Calvert fixed-income, equity and money market funds that meets the Fund's investment criteria, including financial, sustainability and social responsibility factors. </p><p> The Fund invests in underlying Calvert funds in accordance with a stable target asset allocation determined by the investment advisor (the 'Advisor'). The Fund's asset allocation strategy incorporates historical risk and return characteristics of various asset classes and correlations between asset classes to establish allocations intended to provide an optimal level of return for a given level of risk. Historical returns-based analysis and actual holdings data of the target underlying Calvert funds are then integrated to blend the styles of the underlying Calvert funds with the asset allocation policy. </p><p> The Fund intends to invest in shares of underlying Calvert funds and typically invests in underlying Calvert funds as follows: </p><p> 80% to 100% of Fund's net assets</p><p> In funds that invest primarily in equity securities <b>(Calvert Equity Portfolio, Calvert Social Index Fund, Calvert Enhanced Equity Portfolio, Calvert Large Cap Growth Fund, Calvert Capital Accumulation Fund, Calvert International Equity Fund, Calvert International Opportunities Fund, Calvert Global Alternative Energy Fund, Calvert Global Water Fund and Calvert Small Cap Fund)</b> </p><p> 0% to 20% of Fund's net assets In <b>Calvert Bond Portfolio</b> (which invests pri marily in fixed-income securities) 0% to 5% of Fund's net assets</p><p> In <b>Calvert Money Market Portfolio</b> (which invests primarily in money market instruments) </p><p> </p><p> The Fund may also invest, to a limited extent, in (1) derivative instruments, including, but not limited to, index futures, options and swaps; and (2) exchange-traded funds. The Fund will use these instruments to facilitate the periodic rebalancing of the Fund's portfolio to maintain its target asset allocation, to make tactical asset allocations and to assist in managing cash. </p><p> For information on the investment objectives, strategies and risks of the underlying Calvert funds, see the respective Fund Summaries of the underlying equity funds in this Prospectus, and see 'Description of Underlying Funds' in this Prospectus, which describes the underlying fixed-income and money market funds (<b>Calvert Bond Portfolio</b> and <b>Calvert Money Market Portfolio</b>). </p><p> The Advisor may select new or different underlying Calvert funds other than those listed above without prior approval of or prior notice to shareholders. </p><p> The above asset allocation percentages are allocation targets. The Advisor has discretion to reallocate the Fund's assets among underlying Calvert funds. The Advisor evaluates quarterly any necessary rebalancing of the Fund to adjust for shifts in the style biases of the underlying funds. The Advisor also evaluates annually any necessary rebalancing to reflect different target asset class allocations based on changed economic and market conditions. </p><p> <i>Sustainable and Socially Responsible Investing. </i>Each underlying fund (other than Calvert Global Alternative Energy Fund and Calvert Global Water Fund) seeks to invest in companies and other enterprises that demonstrate positive environmental, social and governance performance as they address corporate responsibility and sustainability challenges. Calvert Global Alternative Energy Fund will invest in ways consistent with Calvert's philosophy that long-term rewards to investors will come from companies and other entities whose products, services, and methods contribute to a more sustainable future. Calvert Global Water Fund seeks to invest in a wide range of companies and other enterprises that demonstrate varying degrees of commitment and progress toward addressing key corporate responsibility and sustainability challenges. </p><p> Each underlying fund (other than Calvert Global Water Fund) has sustainable and socially responsible investment criteria that reflect specific types of companies in which the fund seeks to invest and seeks to avoid investing. Calvert Global Water Fund's sustainable and socially responsible investment criteria reflect threshold responsibility standards used in determining whether a security qualifies as an investment for the fund, and specific types of companies in which the fund seeks to invest. </p><p> Investments for each underlying fund are first selected for financial soundness and then evaluated according to the fund's sustainable and socially responsible investment criteria. Investments for each underlying fund must be consistent with the fund's current investment criteria, including financial, sustainability and social responsibility factors, as well as threshold responsibility standards (for Calvert Global Water Fund only), the application of which is in the economic interest of the underlying fund and its shareholders. </p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalseStrategy Narrative [Text Block]21false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin: 0in 0in 6pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><font style="font-family: 'Arial','sans-serif';" class="_mt"><b>Principal Risks</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalseRisk [Heading]22false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p > </p ><p > You could lose money on your investment in the Fund, or the Fund could underperform, because of the risks described below. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. </p ><p > <i >Asset Allocation Risk.</i > The Advisor's selection of underlying funds and the allocation of Fund assets to those funds may cause the Fund to underperform. The Fund's greater allocation to fixed-income funds makes it more susceptible to risks associated with fixed-income investments than equity investments. </p ><p > <i >Management Risk.</i > Individual stocks and/or bonds in an underlying fund may not perform as expected, and the underlying fund's portfolio management practices may not achieve the desired result. </p ><p > <i >Derivatives Risk.</i > In general, a derivative is a financial contract whose value is based on the value of a financial asset (such as a stock, bond, or currency), a physical asset (such as gold), or a market index (such as the S and P 500 Index). Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying asset, credit risk with respect to the counterparty, and liquidity risk. The Fund's use of certain derivatives may also have a leveraging effect, which may increase the volatility of the Fund and reduce its returns. </p ><p > <i >Exchange-Traded Fund ('ETF') Risk.</i > An ETF seeks to track the performance of an index by holding in its portfolio shares of all the companies, or a representative sample of the companies, that are components of a particular index. The risks of investment in ETFs typically reflect the risk of the types of securities in which the ETFs invest. In addition, when the Fund invests in an ETF, shareholders of the Fund bear their proportionate share of the ETF's fees and expenses as well as their share of the Fund's fees and expenses. </p ><p > <b >Equity Investments.</b > The Fund shares the principal risks of equity securities held by the underlying funds, including the key risks below. </p ><p > <i >Stock Market Risk. </i >The stock market (including stocks that comprise the energy and water-related resource sectors, and stock markets outside the U.S.) may fall in value, causing prices of stocks held by the underlying funds to fall. </p ><p > <i >Common Stock Risk.</i > Although common stocks have a history of long-term growth in value, their prices fluctuate based on changes in a company's financial condition, on overall market and economic conditions, and on investors' perception of a company's well-being. </p ><p > <b >Fixed-Income Investments.</b > The Fund shares the principal risks of fixed-income securities held by the underlying funds, including the key risks below. </p ><p > <i >Bond Market Risk.</i > The market prices of bonds held by the underlying funds may fall. </p ><p > <i >Interest Rate Risk.</i > A change in interest rates may adversely affect the value of the securities. When interest rates rise, the value of fixed-income securities will generally fall. Longer term securities are subject to greater interest rate risk. </p ><p > <i >Credit Risk.</i > The credit quality of the securities may deteriorate, which could lead to default or bankruptcy of the issuer where the issuer becomes unable to pay its obligations when due. </p ><p > <b > Money Market Investments. </b >The Fund shares the principal risks of money market securities held by the underlying funds, including the key risk below. </p ><p > <i >Money Market Risk.</i > Yield will change in response to market interest rates; in general, as market rates go up, so will yield, and vice versa. Although the underlying fund tries to keep the value of its shares constant at $1.00 per share, changes in market rates could cause the value to decrease. Credit quality of the securities may deteriorate, which could lead to default or bankruptcy of the issuer where the issuer becomes unable to pay its obligations when due. Credit risk, however, should be low for the underlying fund because it invests primarily in securities that are considered to be of high quality; the underlying fund also limits the amount it invests in any one issuer to try to lessen its exposure to credit risk. </p ><p > </p > </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalseRisk Narrative [Text Block]23false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin: 0in 0in 6pt; font-family: 'Times New Roman','serif'; font-size: 12pt;"><font style="font-family: 'Arial','sans-serif';" class="_mt"> <b>Performance</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalseBar Chart and Performance Table [Heading]24false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p> </p><p> The following bar chart and table show the Fund's annual returns and its long-term performance, which give some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Class A shares has varied from year to year. The table compares the Fund's performance over time with that of a broad-based securities market index, a composite index and an average. </p><p> The Fund's past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. For updated performance information, visit www.calvert.com. </p><p> The return for the Fund's other Class of shares will differ from the Class A returns shown in the bar chart, depending upon the expenses of that Class. The bar chart does not reflect any sales charge that you may be required to pay upon purchase or redemption of the Fund's shares. Any sales charge will reduce your return. </p><p> </p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalsePerformance Narrative [Text Block]25false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="text-align: center; margin: 10.05pt 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;" align="center"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Calendar Year Total Returns for Class A at NAV</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalseBar Chart [Heading]26false0rr_BarChartTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.calvert.com/role/ScheduleAnnualTotalReturnsBarChartCalvertHighYieldBondFund column period compact * column primary compact * row dei_LegalEntityAxis compact cik001380786_S000027100Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalseBarChart1.jpg<div> &lt;div style="display:none;" &gt;~ http://www.calvert.com/role/ScheduleAnnualTotalReturnsBarChartCalvertHighYieldBondFund column period compact * column primary compact * row dei_LegalEntityAxis compact cik001380786_S000027100Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsehttp://www.calvert.com/role/ScheduleAnnualTotalReturnsBarChartCalvertHighYieldBondFundfalsefalse000026 - Schedule - Annual Total Returnstruefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*5false0rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.13060.1306falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseAnnual Return 2006duration2011-01-18T00:00:002011-01-18T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*6false0rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.05220.0522falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseAnnual Return 2007duration2011-01-18T00:00:002011-01-18T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*7false0rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.3732-0.3732falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseAnnual Return 2008duration2011-01-18T00:00:002011-01-18T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*8false0rr_AnnualReturn2009rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.26180.2618falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseAnnual Return 2009duration2011-01-18T00:00:002011-01-18T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*9false0rr_AnnualReturn2010rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.12070.1207falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseAnnual Return 2010duration2011-01-18T00:00:002011-01-18T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081597Memberrr_ProspectusShareClassAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass A0truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.13060.1306falsefalsefalsetruefalse2truetruefalse0.05220.0522falsefalsefalsetruefalse3truetruefalse-0.3732-0.3732falsefalsefalsetruefalse4truetruefalse0.26180.2618falsefalsefalsetruefalse5truetruefalse0.12070.1207falsefalsefalsetruefalseOthernanafalsefalseCALVERT AGGRESSIVE ALLOCATION FUND Class A51Annual Total Returns UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*Rowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to BarChartData.No authoritative reference available.falsefalseBar Chart [Table]27false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p> Best Quarter (of periods shown) 6/30/09 16.87% Worst Quarter (of periods shown) 12/31/08 -21.79% </p> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseBar Chart Closing [Text Block]28false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p > The average total return table shows the Fund's returns with the maximum sales charge deducted, and no sales charge has been applied to the indices used for comparison in the table. </p ><p > After-tax returns are calculated using the historical highest individual federal marginal income tax rates, and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. The after-tax returns shown are not relevant to you if you hold your Fund shares through a tax-deferred arrangement such as a 401(k) plan or individual retirement account. The return after taxes on distributions and sale of Fund shares may be higher than the return before taxes because the calculation assumes that shareholders receive a tax benefit for capital losses incurred on the sale of their shares. After-tax returns are shown only for Class A shares; after-tax returns for the other Class will vary. </p > </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalsePerformance Table Narrative29false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="text-align: center; margin: 0in 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;" align="center"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Average Annual Total Returns</font></b></p> <p style="text-align: center; margin: 0in 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;" align="center"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">(as of 12-31-10)</font></b></p> <p style="text-align: center; margin: 0in 0in 0pt; font-family: 'Times New Roman','serif'; font-size: 12pt;" align="center"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">(with maximum sales charge deducted, if any)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalsePerformance Table Heading30false0rr_PerformanceTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.calvert.com/role/ScheduleAverageAnnualTotalReturnsTransposedCalvertHighYieldBondFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik001380786_S000027100Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ 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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06740.0674falsefalsefalsetruefalse2truetruetrue0.06710.0671falsefalsefalsetruefalse3truetruetrue0.04420.0442falsefalsefalsetruefalse4truetruetrue0.09680.0968falsefalsefalsetruefalse5truetruetrue0.16930.1693falsefalsefalsetruefalse6truetruetrue0.14220.1422[1]falsefalsefalsetruefalse7truetruetrue0.15910.1591falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse1 Yearduration2011-01-18T00:00:002011-01-18T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00900.0090falsefalsefalsetruefalse2truetruetrue-0.0027-0.0027falsefalsefalsetruefalse3truetruetrue0.00010.0001falsefalsefalsetruefalse4truetruetrue-0.0027-0.0027falsefalsefalsetruefalse5truetruetrue0.02740.0274falsefalsefalsetruefalse6truetruetrue0.03160.0316[1]falsefalsefalsetruefalse7truetruetrue0.02420.0242falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse5 Yearsduration2011-01-18T00:00:002011-01-18T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01170.0117falsefalsefalsetruefalse2truetruetrue0.00820.0082falsefalsefalsetruefalse3truetruetrue0.00930.0093falsefalsefalsetruefalse4truetruetrue0.00760.0076falsefalsefalsetruefalse5truetruetrue0.03600.0360falsefalsefalsetruefalse6truetruetrue0.04290.0429[1]falsefalsefalsetruefalse7truetruetrue0.03350.0335falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseSince Inceptionduration2011-01-18T00:00:002011-01-18T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002005-06-30falsefalsetruetruefalse2falsetruefalse002005-06-30falsefalsetruetruefalse3falsetruefalse002005-06-30falsefalsetruetruefalse4falsetruefalse002005-06-30falsefalsetruetruefalse5falsetruefalse002005-06-30falsefalsetruetruefalse6falsetruefalse002005-06-30[1]falsefalsetruetruefalse7falsetruefalse002005-06-30falsefalsetruetruefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalseInception Dateduration2011-01-18T00:00:002011-01-18T00:00:00falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081597Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass ABefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06740.0674falsefalsefalsetruefalse2truetruetrue0.00900.0090falsefalsefalsetruefalse3truetruetrue0.01170.0117falsefalsefalsetruefalse4falsetruefalse002005-06-302005-06-30falsefalsetruetruefalseOthernanafalsefalseClass A2falseRowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081597Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn after taxes on distributionsrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsMemberrr_PerformanceMeasureAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass AReturn after taxes on distributionsStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06710.0671falsefalsefalsetruefalse2truetruetrue-0.0027-0.0027falsefalsefalsetruefalse3truetruetrue0.00820.0082falsefalsefalsetruefalse4falsetruefalse002005-06-302005-06-30falsefalsetruetruefalseOthernanafalsefalseClass A Return after taxes on distributions3falseRowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081597Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn after taxes on distributions and sale of Fund sharesrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsAndSalesMemberrr_PerformanceMeasureAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass AReturn after taxes on distributions and sale of Fund sharesStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04420.0442falsefalsefalsetruefalse2truetruetrue0.00010.0001falsefalsefalsetruefalse3truetruetrue0.00930.0093falsefalsefalsetruefalse4falsetruefalse002005-06-302005-06-30falsefalsetruetruefalseOthernanafalsefalseClass A Return after taxes on distributions and sale of Fund shares4falseRowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081599Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDClass CBefore TaxesStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.09680.0968falsefalsefalsetruefalse2truetruetrue-0.0027-0.0027falsefalsefalsetruefalse3truetruetrue0.00760.0076falsefalsefalsetruefalse4falsetruefalse002005-06-302005-06-30falsefalsetruetruefalseOthernanafalsefalseClass C5falseRowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMemberfalsefalseRussell 3000 Indexrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_C000081600Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDRussell 3000 IndexBefore TaxesStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.16930.1693falsefalsefalsetruefalse2truetruetrue0.02740.0274falsefalsefalsetruefalse3truetruetrue0.03600.0360falsefalsefalsetruefalse4falsetruefalse002005-06-302005-06-30falsefalsetruetruefalseOthernanafalsefalseRussell 3000 Index6falseRowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMembertruefalseShare Classesrr_ProspectusShareClassAxisrr_ShareClassDomainrr_ProspectusShareClassAxisexplicitMemberfalsefalseAggressive Allocation Composite Indexrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_MerrillLynchFixedRatePreferredSecuritiesIndexMemberrr_PerformanceMeasureAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDShare ClassesAggressive Allocation Composite IndexStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.14220.1422falsefalsefalsetruefalse2truetruetrue0.03160.0316falsefalsefalsetruefalse3truetruetrue0.04290.0429falsefalsefalsetruefalse4falsetruefalse002005-06-302005-06-30falsefalsetruetruefalseOthernanafalsefalseAggressive Allocation Composite Index7falseRowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseCALVERT AGGRESSIVE ALLOCATION FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_S000027100Memberdei_LegalEntityAxisexplicitMembertruefalseShare Classesrr_ProspectusShareClassAxisrr_ShareClassDomainrr_ProspectusShareClassAxisexplicitMemberfalsefalseLipper Multi-Cap Core Funds Avg.rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik001380786_LipperCorporateDebtBbbRatedFundsCategoryAverageMemberrr_PerformanceMeasureAxisexplicitMemberCALVERT AGGRESSIVE ALLOCATION FUNDShare ClassesLipper Multi-Cap Core Funds Avg.Standard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.15910.1591falsefalsefalsetruefalse2truetruetrue0.02420.0242falsefalsefalsetruefalse3truetruetrue0.03350.0335falsefalsefalsetruefalse4falsetruefalse002005-06-302005-06-30falsefalsetruetruefalseOthernanafalsefalseLipper Multi-Cap Core Funds Avg.1 The Fund also shows the Aggressive Allocation Composite Index (64% Russell 3000 Index; 26% Morgan Stanley Capital International Europe Australasia Far East Global Investable Market Index; 10% Barclays Capital U.S. Credit Index) because it is more consistent with the Fund's portfolio construction process and represents a more accurate reflection of the Fund's anticipated risk and return patterns. <p>Index reflects no deduction for fees, expenses or taxes. Lipper Average reflects no deduction for taxes.</p>47Average Annual Total Returns CALVERT AGGRESSIVE ALLOCATION FUNDUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_LegalEntityAxisAxiscik001380786_S000027100MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to PerformanceTableData.No authoritative reference available.falsefalsePerformance [Table]128Risk/Return Summary (CALVERT AGGRESSIVE ALLOCATION FUND)UnKnownUnKnownUnKnownUnKnownfalsetrue