2.2.0.25truefalse000071 - Document - Risk/Return Summary {Unlabeled} - DWS Short Duration Plus Fundfalsefalsetrue1falsefalseUSDtruefalse{dei_LegalEntityAxis} : S000031152 Member 2/1/2011 - 2/1/2011 USD ($) $Duration_2_1_2011_To_2_1_20116http://www.sec.gov/CIK0000747677duration2011-02-01T00:00:002011-02-01T00:00:00falsefalsecik000074767_S000031152Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">DWS SHORT DURATION PLUS 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-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">INVESTMENT OBJECTIVE</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> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">The fund's investment objective is to provide high income while also seeking to maintain a high degree of stability of shareholders' capital.</font></p></div> </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-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">FEES AND EXPENSES OF THE FUND</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> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">These are the fees and expenses you may pay when you buy and hold shares.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least&nbsp;<font class="_mt">$100,000</font> in DWS funds.</font> More information about these and other discounts is available from your financial professional and in Choosing a Share Class (p. 66) and Purchase and Redemption of Shares in the fund's Statement of Additional Information (SAI) (p. II 17).</font></p></div> </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-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">SHAREHOLDER 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.dws-investments.com/role/ScheduleShareholderFeesDwsShortDurationPlusFund column period compact * column dei_LegalEntityAxis compact cik000074767_S000031152Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; 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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) imposed on purchases, as % of offering price0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02750.0275falsefalsefalsetruefalse2truetruetrue00falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue00falsefalsefalsetruefalseOthernanafalsefalseMaximum sales charge (load) imposed on purchases, as % of offering price2falseRowprimaryElement*6false0rr_MaximumDeferredSalesChargeOverOtherrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruetrue00falsefalsefalsetruefalse2truetruetrue0.040.04falsefalsefalsetruefalse3truetruetrue0.010.01falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) "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). 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 % of redemption proceeds0rr_MaximumDeferredSalesChargeOverOthertruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalse2truetruetrue0.040.04falsefalsefalsetruefalse3truetruetrue0.010.01falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue00falsefalsefalsetruefalseOthernanafalsefalseMaximum deferred sales charge (load), as % of redemption proceeds52Shareholder Fees - DWS Short Duration Plus Fund DWS Short Duration Plus FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_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-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">ANNUAL FUND OPERATING EXPENSES (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.dws-investments.com/role/ScheduleAnnualFundOperatingExpensesDwsShortDurationPlusFund1 column period compact * column dei_LegalEntityAxis compact cik000074767_S000031152Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.dws-investments.com/role/ScheduleAnnualFundOperatingExpensesDwsShortDurationPlusFund1 column period compact * column dei_LegalEntityAxis compact cik000074767_S000031152Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.dws-investments.com/role/ScheduleAnnualFundOperatingExpensesDwsShortDurationPlusFund1falsefalse000073 - 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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/service (12b-1) fees0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00240.0024falsefalsefalsetruefalse2truetruetrue0.00990.0099falsefalsefalsetruefalse3truetruetrue0.010.01falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue00falsefalsefalsetruefalseOthernanafalsefalseDistribution/service (12b-1) fees3falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00240.0024falsefalsefalsetruefalse2truetruetrue0.00440.0044falsefalsefalsetruefalse3truetruetrue0.00230.0023falsefalsefalsetruefalse4truetruetrue0.00150.0015falsefalsefalsetruefalse5truetruetrue0.00360.0036falsefalsefalsetruefalseOtherrr: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_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00240.0024falsefalsefalsetruefalse2truetruetrue0.00440.0044falsefalsefalsetruefalse3truetruetrue0.00230.0023falsefalsefalsetruefalse4truetruetrue0.00150.0015falsefalsefalsetruefalse5truetruetrue0.00360.0036falsefalsefalsetruefalseOthernanafalsefalseOther expenses4falseRowprimaryElement*9false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.00830.0083falsefalsefalsetruefalse2truetruetrue0.01780.0178falsefalsefalsetruefalse3truetruetrue0.01580.0158falsefalsefalsetruefalse4truetruetrue0.0050.005falsefalsefalsetruefalse5truetruetrue0.00710.0071falsefalsefalsetruefalseOtherrr: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_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00830.0083falsefalsefalsetruefalse2truetruetrue0.01780.0178falsefalsefalsetruefalse3truetruetrue0.01580.0158falsefalsefalsetruefalse4truetruetrue0.0050.005falsefalsefalsetruefalse5truetruetrue0.00710.0071falsefalsefalsetruefalseOthernanafalsefalseTOTAL ANNUAL FUND OPERATING EXPENSES5falseRowprimaryElement*10false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truetruetrue00falsefalsefalsetruefalse2truetruetrue00falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue0.00040.0004falsefalsefalsetruefalseOtherrr: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/reimbursement0rr_FeeWaiverOrReimbursementOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalse2truetruetrue00falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue0.00040.0004falsefalsefalsetruefalseOthernanafalsefalseLess fee waiver/reimbursement6falseRowprimaryElement*11false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.00830.0083falsefalsefalsetruefalse2truetruetrue0.01780.0178falsefalsefalsetruefalse3truetruetrue0.01580.0158falsefalsefalsetruefalse4truetruetrue0.0050.005falsefalsefalsetruefalse5truetruetrue0.00670.0067falsefalsefalsetruefalseOtherrr: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 EXPENSES (after fee waiver and/or expense reimbursement)0rr_NetExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00830.0083falsefalsefalsetruefalse2truetruetrue0.01780.0178falsefalsefalsetruefalse3truetruetrue0.01580.0158falsefalsefalsetruefalse4truetruetrue0.0050.005falsefalsefalsetruefalse5truetruetrue0.00670.0067falsefalsefalsetruefalseOthernanafalsefalseNET ANNUAL FUND OPERATING EXPENSES (after fee waiver and/or expense reimbursement)56Annual Fund Operating Expenses - DWS Short Duration Plus Fund DWS Short Duration Plus FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_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_ExpenseFootnotesTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">The Advisor has contractually agreed through&nbsp;<font class="_mt">January 31, 2012</font> to maintain the fund's total annual operating expenses (excluding extraordinary expenses, taxes, brokerage and interest expense) at a ratio no higher than 0.67% for Class S. The agreement may only be terminated with the consent of the fund's Board.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringShareholder Fees.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subsection instructions falsefalseExpense Footnotes [Text Block]13false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">EXAMPLE</font></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]14false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">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 fund's operating expenses (including one year of capped expenses in each period for Class S) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</font></p></div> </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]15false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.dws-investments.com/role/ScheduleExpenseExampleTransposedDwsShortDurationPlusFund row period compact * row dei_LegalEntityAxis compact cik000074767_S000031152Member row rr_ProspectusShareClassAxis compact * column primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.dws-investments.com/role/ScheduleExpenseExampleTransposedDwsShortDurationPlusFund row period compact * row dei_LegalEntityAxis compact cik000074767_S000031152Member row rr_ProspectusShareClassAxis compact * column primary compact * ~&lt;/div&gt; </div>truehttp://www.dws-investments.com/role/ScheduleExpenseExampleTransposedDwsShortDurationPlusFundfalsefalse000074 - Schedule - Expense Example {Transposed} - DWS Short Duration Plus Fundtruefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096654Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundClass AfalseUSDfalsefalse$2falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Brr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096655Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundClass BfalseUSDfalsefalse$3falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096656Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundClass CfalseUSDfalsefalse$4falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseINST Classrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096658Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundINST ClassfalseUSDfalsefalse$5falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Srr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096657Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundClass SfalseUSDfalsefalse$1falseRowprimaryElement*RowunitUnit*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue357357falsefalsefalsetruefalse2truefalsetrue581581falsefalsefalsetruefalse3truefalsetrue261261falsefalsefalsetruefalse4truefalsetrue5151falsefalsefalsetruefalse5truefalsetrue6868falsefalsefalsetruefalseMonetaryrr: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_ExpenseExampleYear01truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue357357falsefalsefalsetruefalse2truefalsetrue581581falsefalsefalsetruefalse3truefalsetrue261261falsefalsefalsetruefalse4truefalsetrue5151falsefalsefalsetruefalse5truefalsetrue6868falsefalsefalsetruefalseOthernanafalsefalse1 Year2falseRowprimaryElement*RowunitUnit*6false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue533533falsefalsefalsetruefalse2truefalsetrue860860falsefalsefalsetruefalse3truefalsetrue499499falsefalsefalsetruefalse4truefalsetrue160160falsefalsefalsetruefalse5truefalsetrue223223falsefalsefalsetruefalseMonetaryrr: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_ExpenseExampleYear03truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue533533falsefalsefalsetruefalse2truefalsetrue860860falsefalsefalsetruefalse3truefalsetrue499499falsefalsefalsetruefalse4truefalsetrue160160falsefalsefalsetruefalse5truefalsetrue223223falsefalsefalsetruefalseOthernanafalsefalse3 Years3falseRowprimaryElement*RowunitUnit*7false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue723723falsefalsefalsetruefalse2truefalsetrue11641164falsefalsefalsetruefalse3truefalsetrue860860falsefalsefalsetruefalse4truefalsetrue280280falsefalsefalsetruefalse5truefalsetrue391391falsefalsefalsetruefalseMonetaryrr: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_ExpenseExampleYear05truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue723723falsefalsefalsetruefalse2truefalsetrue11641164falsefalsefalsetruefalse3truefalsetrue860860falsefalsefalsetruefalse4truefalsetrue280280falsefalsefalsetruefalse5truefalsetrue391391falsefalsefalsetruefalseOthernanafalsefalse5 Years4falseRowprimaryElement*RowunitUnit*8false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue12721272falsefalsefalsetruefalse2truefalsetrue16131613falsefalsefalsetruefalse3truefalsetrue18781878falsefalsefalsetruefalse4truefalsetrue628628falsefalsefalsetruefalse5truefalsetrue879879falsefalsefalsetruefalseMonetaryrr: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_ExpenseExampleYear10truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue12721272falsefalsefalsetruefalse2truefalsetrue16131613falsefalsefalsetruefalse3truefalsetrue18781878falsefalsefalsetruefalse4truefalsetrue628628falsefalsefalsetruefalse5truefalsetrue879879falsefalsefalsetruefalseOthernanafalsefalse10 Years54Expense Example - DWS Short Duration Plus Fund DWS Short Duration Plus Fund (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_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_ExpenseExampleNoRedemptionNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExampleNoRedemption.No authoritative reference available.falsefalseExpense Example, No Redemption Narrative [Text Block]17false0rr_ExpenseExampleNoRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.dws-investments.com/role/ScheduleExpenseExampleNoRedemptionTransposedDwsShortDurationPlusFund row period compact * row dei_LegalEntityAxis compact cik000074767_S000031152Member row rr_ProspectusShareClassAxis compact * column primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.dws-investments.com/role/ScheduleExpenseExampleNoRedemptionTransposedDwsShortDurationPlusFund row period compact * row dei_LegalEntityAxis compact cik000074767_S000031152Member row rr_ProspectusShareClassAxis compact * column primary compact * ~&lt;/div&gt; </div>truehttp://www.dws-investments.com/role/ScheduleExpenseExampleNoRedemptionTransposedDwsShortDurationPlusFundfalsefalse000075 - Schedule - Expense Example, No Redemption {Transposed} - DWS Short Duration Plus Fundtruefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096654Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundClass AfalseUSDfalsefalse$2falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Brr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096655Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundClass BfalseUSDfalsefalse$3falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096656Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundClass CfalseUSDfalsefalse$4falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseINST Classrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096658Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundINST ClassfalseUSDfalsefalse$5falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*duration2011-02-01T00:00:002011-02-01T00:00:00falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Srr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096657Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundClass SfalseUSDfalsefalse$1falseRowprimaryElement*RowunitUnit*5false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue357357falsefalsefalsetruefalse2truefalsetrue181181falsefalsefalsetruefalse3truefalsetrue161161falsefalsefalsetruefalse4truefalsetrue5151falsefalsefalsetruefalse5truefalsetrue6868falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou 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 falsefalse1 YearUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700rr_ExpenseExampleNoRedemptionYear01truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue357357falsefalsefalsetruefalse2truefalsetrue181181falsefalsefalsetruefalse3truefalsetrue161161falsefalsefalsetruefalse4truefalsetrue5151falsefalsefalsetruefalse5truefalsetrue6868falsefalsefalsetruefalseOthernanafalsefalse1 Year2falseRowprimaryElement*RowunitUnit*6false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue533533falsefalsefalsetruefalse2truefalsetrue560560falsefalsefalsetruefalse3truefalsetrue499499falsefalsefalsetruefalse4truefalsetrue160160falsefalsefalsetruefalse5truefalsetrue223223falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou 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 falsefalse3 YearsUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700rr_ExpenseExampleNoRedemptionYear03truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue533533falsefalsefalsetruefalse2truefalsetrue560560falsefalsefalsetruefalse3truefalsetrue499499falsefalsefalsetruefalse4truefalsetrue160160falsefalsefalsetruefalse5truefalsetrue223223falsefalsefalsetruefalseOthernanafalsefalse3 Years3falseRowprimaryElement*RowunitUnit*7false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue723723falsefalsefalsetruefalse2truefalsetrue964964falsefalsefalsetruefalse3truefalsetrue860860falsefalsefalsetruefalse4truefalsetrue280280falsefalsefalsetruefalse5truefalsetrue391391falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou 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 4 -Subparagraph f -Subsection instructions falsefalse5 YearsUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700rr_ExpenseExampleNoRedemptionYear05truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue723723falsefalsefalsetruefalse2truefalsetrue964964falsefalsefalsetruefalse3truefalsetrue860860falsefalsefalsetruefalse4truefalsetrue280280falsefalsefalsetruefalse5truefalsetrue391391falsefalsefalsetruefalseOthernanafalsefalse5 Years4falseRowprimaryElement*RowunitUnit*8false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue12721272falsefalsefalsetruefalse2truefalsetrue16131613falsefalsefalsetruefalse3truefalsetrue18781878falsefalsefalsetruefalse4truefalsetrue628628falsefalsefalsetruefalse5truefalsetrue879879falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou 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 4 -Subparagraph f -Subsection instructions falsefalse10 YearsUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700rr_ExpenseExampleNoRedemptionYear10truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue12721272falsefalsefalsetruefalse2truefalsetrue16131613falsefalsefalsetruefalse3truefalsetrue18781878falsefalsefalsetruefalse4truefalsetrue628628falsefalsefalsetruefalse5truefalsetrue879879falsefalsefalsetruefalseOthernanafalsefalse10 Years54Expense Example, No Redemption - DWS Short Duration Plus Fund DWS Short Duration Plus Fund (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik000074767_S000031152MemberColumnrr_ProspectusShareClassAxisAxis*RowprimaryElement*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExampleNoRedemption.No authoritative reference available.falsefalseExpense Example, No Redemption [Table]18false0rr_ExpenseExampleClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">Class B converts to Class A after six years; the Example for Class B reflects Class A fees after the conversion.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe 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.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseExpense Example Closing [Text Block]19false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><br /><font size="2" class="_mt">PORTFOLIO TURNOVER</font></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]20false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">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 and may mean higher taxes if you are investing in a taxable account. These costs are not reflected in annual fund operating expenses or in the expense example, and can affect the fund's performance.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">Portfolio turnover rate for fiscal year 2010: <font class="_mt">100%</font>.</font></p></div> </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]21false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p><font size="2" class="_mt">PRINCIPAL INVESTMENT STRATEGY</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]22false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">MAIN INVESTMENTS. Under normal market conditions, the fund invests at least 65% of its total assets in fixed income securities rated, at the time of purchase, within the top four long-term rating categories by a nationally recognized statistical rating organization (a "NRSRO") (or, if unrated, determined by the fund's investment advisor to be of similar quality). The fund may invest in securities of varying maturities. The fund normally seeks to maintain an average portfolio duration of no longer than three years by investing in fixed income securities with short-to intermediate-term maturities.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">The fund may also invest up to 10% of its assets in domestic and foreign below investment-grade fixed income securities (junk bonds) rated in the fifth and sixth long-term rating categories by a NRSRO or, if unrated, determined by the fund's investment advisor to be of similar quality, including those whose issuers are located in countries with new or emerging securtiies markets.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">MANAGEMENT PROCESS. The fund's investment strategy emphasizes a diversified exposure to higher yielding mortgage, corporate and asset-backed sectors of the investment-grade fixed income markets. Portfolio management uses a top-down approach, first focusing on sector allocations, then using relative value analysis to select the best securities within each sector. When selecting securities, portfolio management analyzes such factors as credit quality, interest rate sensitivity and spread relationships between individual bonds.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">GLOBAL TACTICAL ASSET ALLOCATION OVERLAY STRATEGY. In addition to the fund's main investment strategy, portfolio management seeks to enhance returns by employing a global tactical asset allocation (GTAA) overlay strategy. This strategy attempts to take advantage of inefficiencies within global bond and currency markets. The strategy is implemented through the use of derivatives, which are contracts or other instruments whose value is based on, for example, indices, currencies or securities. The strategy primarily uses exchange-traded futures contracts and over-the-counter forward currency contracts.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">DERIVATIVES. Outside of the GTAA strategy, portfolio management generally may use interest rate swaps and total return swaps, which are types of derivatives (a contract whose value is based on, for example, indices, currencies or securities), for duration management (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). In addition, portfolio management generally may use credit default swaps to increase the fund's income, to gain exposure to a bond issuer's credit quality characteristics without directly investing in the bond, or to hedge the risk of default on bonds held in the fund's portfolio.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">The fund may also use various types of derivatives (i) for hedging purposes; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">SECURITIES LENDING. The fund may lend securities (up to one-third of total assets) to approved institutions.</font></p></div> </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]23false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">MAIN RISKS</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]24false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"><font class="_mt"><font size="2" class="_mt">There are several risk factors that could hurt the fund's performance, cause you to lose money or cause the fund's performance to trail that of other investments. </font></font>The fund may not achieve its investment objective, and is not intended to be a complete investment program. <font class="_mt">An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.</font></font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">INTEREST RATE RISK. When interest rates rise, prices of debt securities generally decline. The longer the duration of the fund's debt securities, the more sensitive it will be to interest rate changes. (As a general rule, a 1% rise in interest rates means a 1% fall in value for every year of duration.)</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">CREDIT RISK. The fund's performance could be hurt if an issuer of a debt security suffers an adverse change in financial condition that results in a payment default, security downgrade or inability to meet a financial obligation.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">SECURITY SELECTION RISK. The securities in the fund's portfolio may decline in value. Portfolio management could be wrong in its analysis of industries, companies, economic trends, the relative attractiveness of different securities or other matters.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">GTAA RISK. The success of the GTAA strategy depends, in part, on portfolio management's ability to analyze the correlation between various global markets and asset classes. If portfolio management's correlation analysis proves to be incorrect, losses to the fund may be significant and may substantially exceed the intended level of market exposure for the GTAA strategy.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">DERIVATIVES RISK. Risks associated with derivatives include the risk that the derivative is not well correlated with the security, index or currency to which it relates; the risk that derivatives may result in losses or missed opportunities; the risk that the fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; and the risk that the derivative transaction could expose the fund to the effects of leverage, which could increase the fund's exposure to the market and magnify potential losses.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">COUNTERPARTY RISK. A financial institution or other counterparty with whom the fund does business, or that underwrites, distributes or guarantees any investments or contracts that the fund owns or is otherwise exposed to, may decline in financial health and become unable to honor its commitments. This could cause losses for the fund or could delay the return or delivery of collateral or other assets to the fund.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">FOREIGN INVESTMENT RISK. The fund faces the risks inherent in foreign investing. Adverse political, economic or social developments could undermine the value of the fund's investments or prevent the fund from realizing their full value. Financial reporting standards for companies based in foreign markets differ from those in the US. Additionally, foreign securities markets generally are smaller and less liquid than US markets. To the extent that the fund invests in non-US dollar denominated foreign securities, changes in currency exchange rates may affect the US dollar value of foreign securities or the income or gain received on these securities.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"> </font>&nbsp;</p> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">EMERGING MARKETS RISK. Foreign investment risks are greater in emerging markets than in developed markets. Investments in emerging markets are often considered speculative.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><br /><font size="2" class="_mt">LIQUIDITY RISK. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><br /><font size="2" class="_mt">PRICING RISK. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><br /><font size="2" class="_mt">SECURITIES LENDING RISK. Any decline in the value of a portfolio security that occurs while the security is out on loan is borne by the fund, and will adversely affect performance. Also, there may be delays in recovery of securities loaned or even a loss of rights in the collateral should the borrower of the securities fail financially while holding the security.</font></p></div> </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]25false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">PAST PERFORMANCE</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]26false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"><font class="_mt"><font size="2" class="_mt">How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index).&nbsp;</font></font><font class="_mt">Past performance may not indicate future results.</font> All performance figures below assume that dividends were reinvested. For more recent performance figures, go to&nbsp;</font><font class="_mt"><font size="2" class="_mt">www.dws-investments.com</font></font><font size="2" class="_mt"> (the Web site does not form a part of this prospectus) or call the phone number for your share class included in this prospectus.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><br /><font size="2" class="_mt">For Class A, Class B and Class C shares, historical performance prior to class inception is based on the performance of the fund's original share class, Investment Class shares, adjusted to reflect the higher expenses and applicable sales charges of the relevant share class. Investment Class shares were renamed Class S shares on October 23, 2006.</font></p> <p style="margin-top: 0px; margin-bottom: 0px;"><br /><font size="2" class="_mt">Prior to November 17, 2004, the fund had a different objective, strategies, fees and expenses. Consequently, the fund's past performance prior to this time may have been different if the current strategy had been in place.</font></p></div> </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]27false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font size="2" class="_mt">CALENDAR YEAR TOTAL RETURNS (%) (Class S)</font>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]28false0rr_BarChartNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"><font class="_mt"><font size="2" class="_mt"><font class="_mt"><font size="2" class="_mt"><font class="_mt"><font size="2" class="_mt">These year-by-year returns do not include sales charges, and would be lower if they did. </font></font></font></font></font></font>Returns for other classes were different and are not shown here.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringProvide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalseBar Chart Narrative [Text Block]29false0rr_BarChartTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.dws-investments.com/role/ScheduleAnnualTotalReturnsBarChartDwsShortDurationPlusFund column period compact * column primary compact * row dei_LegalEntityAxis compact cik000074767_S000031152Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalseBarChart1.jpg<div> &lt;div style="display:none;" &gt;~ http://www.dws-investments.com/role/ScheduleAnnualTotalReturnsBarChartDwsShortDurationPlusFund column period compact * column primary compact * row dei_LegalEntityAxis compact cik000074767_S000031152Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsehttp://www.dws-investments.com/role/ScheduleAnnualTotalReturnsBarChartDwsShortDurationPlusFundfalsefalse000076 - Schedule - Annual Total Returns - DWS Short Duration Plus Fundtruefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*5false0rr_AnnualReturn2001rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.06140.0614falsefalsefalsetruefalseOtherxbrli: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 2001duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*6false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.05010.0501falsefalsefalsetruefalseOtherxbrli: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 2002duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*7false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04010.0401falsefalsefalsetruefalseOtherxbrli: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 2003duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*8false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.06530.0653falsefalsefalsetruefalseOtherxbrli: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 2004duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*9false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.02560.0256falsefalsefalsetruefalseOtherxbrli: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 2005duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$6falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*10false0rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.05730.0573falsefalsefalsetruefalseOtherxbrli: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 2006duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$7falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*11false0rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.05480.0548falsefalsefalsetruefalseOtherxbrli: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 2007duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$8falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*12false0rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0686-0.0686falsefalsefalsetruefalseOtherxbrli: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 2008duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$9falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*13false0rr_AnnualReturn2009rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.12970.1297falsefalsefalsetruefalseOtherxbrli: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 2009duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$10falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*14false0rr_AnnualReturn2010rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04290.0429falsefalsefalsetruefalseOtherxbrli: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 2010duration2011-02-01T00:00:002011-02-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Srr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096657Memberrr_ProspectusShareClassAxisexplicitMemberDWS Short Duration Plus FundClass S0truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.06140.0614falsefalsefalsetruefalse2truetruefalse0.05010.0501falsefalsefalsetruefalse3truetruefalse0.04010.0401falsefalsefalsetruefalse4truetruefalse0.06530.0653falsefalsefalsetruefalse5truetruefalse0.02560.0256falsefalsefalsetruefalse6truetruefalse0.05730.0573falsefalsefalsetruefalse7truetruefalse0.05480.0548falsefalsefalsetruefalse8truetruefalse-0.0686-0.0686falsefalsefalsetruefalse9truetruefalse0.12970.1297falsefalsefalsetruefalse10truetruefalse0.04290.0429falsefalsefalsetruefalseOthernanafalsefalseDWS Short Duration Plus Fund Class S101Annual Total Returns - DWS Short Duration Plus Fund UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*Rowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to BarChartData.No authoritative reference available.falsefalseBar Chart [Table]30false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"><font class="_mt"><font size="2" class="_mt">Best Quarter</font></font>: 4.62%, Q2 2009&nbsp;&nbsp; <font class="_mt">Worst Quarter</font>: -5.08%, Q4 2008</font></p></div> </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]31false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt">AVERAGE ANNUAL TOTAL RETURNS<br />(For periods ended 12/31/2010 expressed as a %)</font></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 Heading32false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font size="2" class="_mt"><font class="_mt"><font size="2" class="_mt">After-tax returns (which are shown only for Class S and would be different for other classes) reflect the historical highest individual federal income tax rates, but do not reflect any state or local taxes. </font></font>Your actual after-tax returns may be different.&nbsp;<font class="_mt">After-tax returns are not relevant to shares held in an IRA, 401(k) or other tax-advantaged investment plan.</font> Index comparison for Institutional Class shares began on 8/31/2008.</font></p></div> </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 Narrative33false0rr_PerformanceTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.dws-investments.com/role/ScheduleAverageAnnualTotalReturnsTransposedDwsShortDurationPlusFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik000074767_S000031152Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.dws-investments.com/role/ScheduleAverageAnnualTotalReturnsTransposedDwsShortDurationPlusFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik000074767_S000031152Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>truehttp://www.dws-investments.com/role/ScheduleAverageAnnualTotalReturnsTransposedDwsShortDurationPlusFundfalsefalse000077 - Schedule - Average Annual Total Returns {Transposed} - DWS Short Duration Plus Fundtruefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002002-12-01falsefalsetruetruefalse2falsetruefalse002007-04-20falsefalsetruetruefalse3falsetruefalse002003-02-03falsefalsetruetruefalse4falsetruefalse002008-08-26falsefalsetruetruefalse5falsetruefalse00falsefalsetruetruefalse6falsetruefalse001998-12-23falsefalsetruetruefalse7falsetruefalse00falsefalsetruetruefalse8falsetruefalse00falsefalsetruetruefalse9falsetruefalse00falsefalsetruetruefalseOtherxbrli: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 falsefalseCLASS INCEPTIONduration2011-02-01T00:00:002011-02-01T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01210.0121falsefalsefalsetruefalse2truetruetrue0.00250.0025falsefalsefalsetruefalse3truetruetrue0.03290.0329falsefalsefalsetruefalse4truetruetrue0.04430.0443falsefalsefalsetruefalse5truetruetrue0.0280.028falsefalsefalsetruefalse6truetruetrue0.04290.0429falsefalsefalsetruefalse7truetruetrue0.02960.0296falsefalsefalsetruefalse8truetruetrue0.02780.0278falsefalsefalsetruefalse9truetruetrue0.0280.028falsefalsefalsetruefalseOtherxbrli: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 YEARduration2011-02-01T00:00:002011-02-01T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.03390.0339falsefalsefalsetruefalse2truetruetrue0.0280.028falsefalsefalsetruefalse3truetruetrue0.03210.0321falsefalsefalsetruefalse4falsetruetrue00&nbsp;falsefalsefalsetruefalse5falsetruetrue00&nbsp;falsefalsefalsetruefalse6truetruetrue0.04120.0412falsefalsefalsetruefalse7truetruetrue0.02570.0257falsefalsefalsetruefalse8truetruetrue0.02640.0264falsefalsefalsetruefalse9truetruetrue0.04530.0453falsefalsefalsetruefalseOtherxbrli: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 YEARSduration2011-02-01T00:00:002011-02-01T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04010.0401falsefalsefalsetruefalse2truetruetrue0.03560.0356falsefalsefalsetruefalse3truetruetrue0.03540.0354falsefalsefalsetruefalse4falsetruetrue00&nbsp;falsefalsefalsetruefalse5falsetruetrue00&nbsp;falsefalsefalsetruefalse6truetruetrue0.04480.0448falsefalsefalsetruefalse7truetruetrue0.03160.0316falsefalsefalsetruefalse8truetruetrue0.03230.0323falsefalsefalsetruefalse9truetruetrue0.04340.0434falsefalsefalsetruefalseOtherxbrli: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 falsefalse10 YEARSduration2011-02-01T00:00:002011-02-01T00:00:00falseUSDfalsefalse$5falseColumnperiodPeriod*ColumnprimaryElement*9false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruetrue00&nbsp;falsefalsefalsetruefalse2falsetruetrue00&nbsp;falsefalsefalsetruefalse3falsetruetrue00&nbsp;falsefalsefalsetruefalse4truetruetrue0.04170.0417falsefalsefalsetruefalse5truetruetrue0.03740.0374falsefalsefalsetruefalse6falsetruetrue00&nbsp;falsefalsefalsetruefalse7falsetruetrue00&nbsp;falsefalsefalsetruefalse8falsetruetrue00&nbsp;falsefalsefalsetruefalse9falsetruetrue00&nbsp;falsefalsefalsetruefalseOtherxbrli: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 INCEPTIONduration2011-02-01T00:00:002011-02-01T00:00:00falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096654Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberDWS Short Duration Plus FundClass ABefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002002-12-012002-12-01falsefalsetruetruefalse2truetruetrue0.01210.0121falsefalsefalsetruefalse3truetruetrue0.03390.0339falsefalsefalsetruefalse4truetruetrue0.04010.0401falsefalsefalsetruefalse5falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalseOthernanafalsefalseClass A2falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Brr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096655Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberDWS Short Duration Plus FundClass BBefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002007-04-202007-04-20falsefalsetruetruefalse2truetruetrue0.00250.0025falsefalsefalsetruefalse3truetruetrue0.0280.028falsefalsefalsetruefalse4truetruetrue0.03560.0356falsefalsefalsetruefalse5falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalseOthernanafalsefalseClass B3falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096656Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberDWS Short Duration Plus FundClass CBefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002003-02-032003-02-03falsefalsetruetruefalse2truetruetrue0.03290.0329falsefalsefalsetruefalse3truetruetrue0.03210.0321falsefalsefalsetruefalse4truetruetrue0.03540.0354falsefalsefalsetruefalse5falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalseOthernanafalsefalseClass C4falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Srr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096657Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberDWS Short Duration Plus FundClass SBefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse001998-12-231998-12-23falsefalsetruetruefalse2truetruetrue0.04290.0429falsefalsefalsetruefalse3truetruetrue0.04120.0412falsefalsefalsetruefalse4truetruetrue0.04480.0448falsefalsefalsetruefalse5falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalseOthernanafalsefalseClass S5falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Srr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096657Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseAfter tax on distributionsrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsMemberrr_PerformanceMeasureAxisexplicitMemberDWS Short Duration Plus FundClass SAfter tax on distributionsStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truetruetrue0.02960.0296falsefalsefalsetruefalse3truetruetrue0.02570.0257falsefalsefalsetruefalse4truetruetrue0.03160.0316falsefalsefalsetruefalse5falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalseOthernanafalsefalseClass S After tax on distributions6falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Srr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096657Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseAfter tax on distributions and sale of fund sharesrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsAndSalesMemberrr_PerformanceMeasureAxisexplicitMemberDWS Short Duration Plus FundClass SAfter tax on distributions and sale of fund sharesStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truetruetrue0.02780.0278falsefalsefalsetruefalse3truetruetrue0.02640.0264falsefalsefalsetruefalse4truetruetrue0.03230.0323falsefalsefalsetruefalse5falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalseOthernanafalsefalseClass S After tax on distributions and sale of fund shares7falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Srr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096657Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseBARCLAYS CAPITAL 1-3 YEAR GOVERNMENT/ CREDIT INDEX (reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_BarclaysCapital13YearGovernmentCreditIndexMemberrr_PerformanceMeasureAxisexplicitMemberDWS Short Duration Plus FundClass SBARCLAYS CAPITAL 1-3 YEAR GOVERNMENT/ CREDIT INDEX (reflects no deduction for fees, expenses or taxes)Standard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truetruetrue0.0280.028falsefalsefalsetruefalse3truetruetrue0.04530.0453falsefalsefalsetruefalse4truetruetrue0.04340.0434falsefalsefalsetruefalse5falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalseOthernanafalsefalseClass S BARCLAYS CAPITAL 1-3 YEAR GOVERNMENT/ CREDIT INDEX (reflects no deduction for fees, expenses or taxes)8falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseINST Classrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096658Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberDWS Short Duration Plus FundINST ClassBefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002008-08-262008-08-26falsefalsetruetruefalse2truetruetrue0.04430.0443falsefalsefalsetruefalse3falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalse4falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalse5truetruetrue0.04170.0417falsefalsefalsetruefalseOthernanafalsefalseINST Class9falseRowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseDWS Short Duration Plus Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_S000031152Memberdei_LegalEntityAxisexplicitMemberfalsefalseINST Classrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_C000096658Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseBARCLAYS CAPITAL 1-3 YEAR GOVERNMENT/ CREDIT INDEX (reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000074767_BarclaysCapital13YearGovernmentCreditIndexMemberrr_PerformanceMeasureAxisexplicitMemberDWS Short Duration Plus FundINST ClassBARCLAYS CAPITAL 1-3 YEAR GOVERNMENT/ CREDIT INDEX (reflects no deduction for fees, expenses or taxes)Standard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truetruetrue0.0280.028falsefalsefalsetruefalse3falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalse4falsetruetrue00&nbsp;&nbsp;falsefalsefalsetruefalse5truetruetrue0.03740.0374falsefalsefalsetruefalseOthernanafalsefalseINST Class BARCLAYS CAPITAL 1-3 YEAR GOVERNMENT/ CREDIT INDEX (reflects no deduction for fees, expenses or taxes)59Average Annual Total Returns - DWS Short Duration Plus Fund DWS Short Duration Plus FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_LegalEntityAxisAxiscik000074767_S000031152MemberRowrr_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]131Risk/Return Summary - DWS Short Duration Plus Fund (DWS Short Duration Plus Fund)UnKnownUnKnownUnKnownUnKnownfalsetrue