2.2.0.25truefalse000031 - Document - Risk/Return Summary {Unlabeled} - Legg Mason Manager Select Large Cap Value Fundfalsefalsetrue1falsefalsetruefalse{dei_LegalEntityAxis} : S000027199 Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_20113http://www.sec.gov/CIK0001474103duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik001474103_S000027199Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000027199Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli03false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#508541" size="6">Legg Mason Manager Select Large Cap Value 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: 6px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#508541" size="6">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: 6px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="3">Long-term growth of 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 style="font-family: ARIAL;" class="_mt" color="#508541" size="6">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: 18px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund. </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: 18px; margin-bottom: 0px;"><font color="#508541" class="_mt"><font class="_mt"><strong><font size="2" class="_mt">Shareholder fees </font></strong><font style="font-family: ARIAL;" class="_mt" size="1">(paid directly from your investment)</font><font style="font-family: ARIAL;" class="_mt" size="2"><b> (%)</b></font></font></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.leggmason.com/role/ScheduleShareholderFeesLeggMasonManagerSelectLargeCapValueFund column period compact * column dei_LegalEntityAxis compact cik001474103_S000027199Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.leggmason.com/role/ScheduleShareholderFeesLeggMasonManagerSelectLargeCapValueFund column period compact * column dei_LegalEntityAxis compact cik001474103_S000027199Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.leggmason.com/role/ScheduleShareholderFeesLeggMasonManagerSelectLargeCapValueFundfalsefalse000032 - Schedule - Shareholder Fees - Legg Mason Manager Select Large Cap Value Fundtruefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001474103_S000027199MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseLegg Mason Manager Select Large Cap Value Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000027199Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Irr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_C000082108Memberrr_ProspectusShareClassAxisexplicitMemberLegg Mason Manager Select Large Cap Value FundClass IUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalseMaximum sales charge (load) imposed on purchases (as a % of offering price)0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOthernanafalsefalseMaximum sales charge (load) imposed on purchases (as a % of offering price)2falseRowprimaryElement*6false0rr_MaximumDeferredSalesChargeOverOtherrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOtherrr: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 a % of the lower of net asset value at purchase or redemption) (may be reduced over time)0rr_MaximumDeferredSalesChargeOverOthertruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOthernanafalsefalseMaximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption) (may be reduced over time)12Shareholder Fees - Legg Mason Manager Select Large Cap Value Fund UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001474103_S000027199MemberColumnrr_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"><strong><font color="#508541" size="2" class="_mt">Annual fund operating expenses </font></strong><font color="#508541" class="_mt"><font style="font-family: ARIAL;" class="_mt" size="1">(expenses that you pay each year as a percentage of the value of<br />your investment)</font><font style="font-family: ARIAL;" class="_mt" size="2"><b> (%)</b></font></font></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.leggmason.com/role/ScheduleAnnualFundOperatingExpensesLeggMasonManagerSelectLargeCapValueFundNew column period compact * column dei_LegalEntityAxis compact cik001474103_S000027199Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.leggmason.com/role/ScheduleAnnualFundOperatingExpensesLeggMasonManagerSelectLargeCapValueFundNew column period compact * column dei_LegalEntityAxis compact cik001474103_S000027199Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.leggmason.com/role/ScheduleAnnualFundOperatingExpensesLeggMasonManagerSelectLargeCapValueFundNewfalsefalse000033 - Schedule - Annual Fund Operating Expenses - Legg Mason Manager Select Large Cap Value Fundtruefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001474103_S000027199MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseLegg Mason Manager Select Large Cap Value Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000027199Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Irr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_C000082108Memberrr_ProspectusShareClassAxisexplicitMemberLegg Mason Manager Select Large Cap Value FundClass IUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00750.0075falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalseManagement fees0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00750.0075falsefalsefalsetruefalseOthernanafalsefalseManagement fees2falseRowprimaryElement*6false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalseDistribution and/or service (12b-1) fees0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOthernanafalsefalseDistribution and/or service (12b-1) fees3falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.05040.0504[1]falsefalsefalsetruefalseOtherrr: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_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.05040.0504falsefalsefalsetruefalseOthernanafalsefalseOther expenses4falseRowprimaryElement*8false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.05790.0579falsefalsefalsetruefalseOtherrr: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_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.05790.0579falsefalsefalsetruefalseOthernanafalsefalseTotal annual fund operating expenses5falseRowprimaryElement*9false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0489-0.0489falsefalsefalsetruefalseOtherrr: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 falsefalseFees forgone and/or expenses reimbursed0rr_FeeWaiverOrReimbursementOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0489-0.0489falsefalsefalsetruefalseOthernanafalsefalseFees forgone and/or expenses reimbursed6falseRowprimaryElement*10false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.0090.009[2]falsefalsefalsetruefalseOtherrr: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 truefalseTotal annual fund operating expenses after forgoing fees and/or reimbursing expenses0rr_NetExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.0090.009falsefalsefalsetruefalseOthernanafalsefalseTotal annual fund operating expenses after forgoing fees and/or reimbursing expenses1 "Other expenses" has been restated to reflect current fees. 2 The manager has agreed to forgo fees and/or reimburse operating expenses (other than interest, dividend expense on short sales, taxes, extraordinary expenses, acquired fund fees and expenses, and brokerage commissions (except for brokerage commissions paid on purchases and sales of shares of ETFs)), so that total annual operating expenses are not expected to exceed 0.90% for Class I shares. This arrangement cannot be terminated prior to December 31, 2012 without the Board of Trustees' consent. The manager is permitted to recapture amounts forgone or reimbursed to the class within three years after the year in which the manager earned the fee or incurred the expense if the class' total annual operating expenses have fallen to a level below the limit described above. 16Annual Fund Operating Expenses - Legg Mason Manager Select Large Cap Value Fund UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001474103_S000027199MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalseAnnual Fund Operating Expenses [Table]12false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 18px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Example </b></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]13false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">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: </font></p> <p style="margin-top: 0px; margin-bottom: 0px; font-size: 4px;">&nbsp;</p> <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr><td valign="top" width="2%" align="left"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"><font style="font-family: Times New Roman;" class="_mt" color="#666666" size="2"> </font><font style="font-family: WINGDINGS;" class="_mt" color="#666666" size="2">&#376;</font><font style="font-family: Times New Roman;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font></font></td> <td valign="top" width="1%"><font class="_mt" size="1">&nbsp;</font></td> <td valign="top" align="left"> <p align="left"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">You invest $10,000 in the fund for the time periods indicated </font></p></td></tr></table> <p style="margin-top: 0px; margin-bottom: 0px; font-size: 4px;">&nbsp;</p> <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr><td valign="top" width="2%" align="left"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"><font style="font-family: Times New Roman;" class="_mt" color="#666666" size="2"> </font><font style="font-family: WINGDINGS;" class="_mt" color="#666666" size="2">&#376;</font><font style="font-family: Times New Roman;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font></font></td> <td valign="top" width="1%"><font class="_mt" size="1">&nbsp;</font></td> <td valign="top" align="left"> <p align="left"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">Your investment has a 5% return each year and the fund's operating expenses remain the same </font></p></td></tr></table> <p style="margin-top: 0px; margin-bottom: 0px; font-size: 4px;">&nbsp;</p> <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr><td valign="top" width="2%" align="left"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"><font style="font-family: Times New Roman;" class="_mt" color="#666666" size="2"> </font><font style="font-family: WINGDINGS;" class="_mt" color="#666666" size="2">&#376;</font><font style="font-family: Times New Roman;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font></font></td> <td valign="top" width="1%"><font class="_mt" size="1">&nbsp;</font></td> <td valign="top" align="left"> <p align="left"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">You reinvest all distributions and dividends without a sales charge </font></p></td></tr></table> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">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]14false0rr_ExpenseExampleByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px; font-size: 12px;"><strong><font color="#508541" size="2" class="_mt">Number of years you own your shares ($)</font></strong></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. 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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 yearduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue12881288falsefalsefalsetruefalseMonetaryrr: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 yearsduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue24652465falsefalsefalsetruefalseMonetaryrr: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 yearsduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue53275327falsefalsefalsetruefalseMonetaryrr: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. 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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 yearduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue12881288falsefalsefalsetruefalseMonetaryrr: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 yearsduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue24652465falsefalsefalsetruefalseMonetaryrr: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 yearsduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue53275327falsefalsefalsetruefalseMonetaryrr: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 yearsduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik001474103_S000027199MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseLegg Mason Manager Select Large Cap Value Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000027199Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Irr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_C000082108Memberrr_ProspectusShareClassAxisexplicitMemberLegg Mason Manager Select Large Cap Value FundClass IUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue9292falsefalsefalsetruefalse2truefalsetrue12881288falsefalsefalsetruefalse3truefalsetrue24652465falsefalsefalsetruefalse4truefalsetrue53275327falsefalsefalsetruefalseOthernanafalsefalseLegg Mason Manager Select Large Cap Value Fund Class I41Expense Example, No Redemption - Legg Mason Manager Select Large Cap Value Fund (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_LegalEntityAxisAxiscik001474103_S000027199MemberRowrr_ProspectusShareClassAxisAxis*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_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 12px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Portfolio turnover.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </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]19false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0pt; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">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 result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. The fund commenced operations on December&nbsp;1, 2009. During the fiscal period ended September&nbsp;30, 2010, the fund's portfolio turnover rate was&nbsp;<font class="_mt">63%</font> (not annualized). </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]20false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#508541" size="6">Principal investment strategies </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]21false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 2px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"><font class="_mt"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">Under normal market conditions, the fund will invest at least 80% of its assets in equity securities of large-capitalization companies (or other financial instruments that derive their value from the equity securities of such companies).</font>&nbsp;</font>The fund generally follows a value discipline in selecting securities. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">The fund may invest up to 20% of its net assets in small- and mid- capitalization companies. The fund may also invest up to 20% of its net assets in securities of foreign companies. Further, the fund may engage in short sales of securities and other instruments. Short sales may be used to hedge or substantially offset long positions held by the fund, but also may be unrelated to any long positions held by the fund. The fund may hold no more than 25% of its net assets (taken at current market value) as required collateral for such sales at any one time. The fund may also invest in derivatives such as futures and options, to attempt to enhance its return, or to hedge its investments, among other things. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">The fund utilizes a "multi-manager" approach whereby the fund's assets are normally allocated among multiple investment strategies (each managed by a different subadviser and/or investment team) and the Legg Mason Global Asset Allocation "completion portfolio" (managed by the fund's adviser). Each subadviser and/or investment team uses a different investment strategy that the fund's adviser believes is generally complementary to the investment strategies used by the fund's other subadvisers and investment teams. Each subadviser acts independently from the other subadvisers and from the fund's adviser and uses its own methodology for selecting investments. Under normal market conditions, approximately 30% of the fund's assets will be managed by Brandywine Global Investment Management, LLC in its Dynamic Large Cap Value Equity strategy, approximately 30% of the fund's assets will be managed by Brandywine Global Investment Management, LLC in its Fundamental Large Cap Value Equity strategy, approximately 30% of the fund's assets will be managed by ClearBridge Advisors, LLC in its Large Cap Value strategy and the remainder of the fund's assets will be managed by Legg Mason Global Asset Allocation, LLC in a "completion portfolio" that attempts to reduce overall fund tracking error versus the fund's comparative index. Legg Mason Global Asset Allocation, LLC manages the "completion portfolio" with reference to the portions of the fund's assets managed by the subadvisers, but acts independently of the subadvisers in managing the "completion portfolio." </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]22false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#508541" size="6">Certain 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]23false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <div> <p style="margin-top: 2px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">Risk is inherent in all investing. There is no assurance that the fund will meet its investment objective. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly.<font class="_mt">You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the fund. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Market and equity securities risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The securities markets are volatile and the market prices of the fund's securities may decline generally. Securities fluctuate in price based on changes in a company's financial condition and overall market and economic conditions. If the market prices of the securities owned by the fund fall, the value of your investment in the fund will decline. The recent financial crisis has caused a significant decline in the value and liquidity of many securities and may create a higher degree of volatility in the net asset values of many mutual funds, including the fund. Because these events are unprecedented, it is difficult to predict their magnitude or duration. In response to the crisis, the U.S. government and the Federal Reserve have taken steps to support financial markets. The withdrawal of this support could also negatively affect the value and liquidity of certain securities. In addition, legislation recently enacted in the U.S. calls for changes in many aspects of financial regulation. The impact of the legislation on the markets, and the practical implications for market participants, may not be fully known for some time. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Issuer risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The value of a security can go up or down more than the market as a whole and can perform differently from the value of the market as a whole, often due to disappointing earnings reports by the issuer, unsuccessful products or services, loss of major customers, major litigation against the issuer or changes in government regulations affecting the issuer or the competitive environment. The fund may experience a substantial or complete loss on an individual security. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Multi-manager risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> While LMGAA monitors each subadviser and monitors the overall management of the fund, each subadviser makes investment decisions independently from the others. It is possible that the subadvisers' investment styles will not always be complementary, which could adversely affect the performance of the fund. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Portfolio selection risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The value of your investment may decrease if the portfolio managers' judgment about the attractiveness, value of or market trends affecting a particular security, industry or sector, country or region, or about market movements is incorrect. In addition, the investment models used by the portfolio managers to evaluate securities or securities markets are based on certain assumptions concerning the interplay of market factors and do not assure successful investment. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Value investing risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The value approach to investing involves the risk that stocks may remain undervalued or decline in price. Value stocks as a group may be out of favor and underperform the overall equity market for a long period of time, for example, while the market concentrates on growth stocks. Although the fund will not concentrate its investments in any one industry or industry group, it may, like many value funds, weight its investments toward certain industries, thus increasing its exposure to factors adversely affecting issuers within those industries. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Large capitalization company risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> Large capitalization companies may fall out of favor with&nbsp;investors. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Small and medium capitalization company risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The fund may invest in small- or mid-sized companies. Such companies may be more at risk than larger companies because, among other things, they may fall out of favor with investors, they may have limited product lines, operating history, market or financial resources, or because they may depend on limited management groups. Securities of smaller companies may be more volatile, especially in the short term, may have limited liquidity and may be difficult to value. Smaller companies are often involved in actual or anticipated reorganizations or restructurings and it may be difficult to obtain information as to the financial conditions of smaller companies. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Leveraging risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> Use of leverage can magnify the effects of changes in the value of the fund's investments and makes such investments more volatile. The fund may also have to sell assets at inopportune times to satisfy its obligations. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Foreign investments risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The fund's investments in securities of foreign issuers involve greater risk than investments in securities of U.S. issuers. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. markets, may suffer from political or economic instability and may experience negative government actions, such as currency controls or seizures of private businesses or property. In some foreign countries, less information is available about issuers and markets because of less rigorous accounting and regulatory standards than in the United States. Currency conversion costs and currency fluctuations could erase investment gains or add to investment losses. <b> </b>Because the value of a depositary receipt is dependent upon the market price of an underlying foreign security, depositary receipts are subject to most of the risks associated with investing in foreign securities directly. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Derivatives risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> Using derivatives, especially for non-hedging purposes, can increase fund losses and reduce opportunities for gains when market prices, interest rates, currency rates or the derivative instruments themselves behave in a way not anticipated by the fund. Using derivatives also can have a leveraging effect and increase fund volatility. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Using derivatives may also have adverse tax consequences for the fund's shareholders. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation are not yet fully known and may not be known for some time. New regulation of derivatives may make them more costly, may limit their availability, or may otherwise adversely affect their value or performance. Swap agreements will tend to shift the fund's investment exposure from one type of investment to another. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Convertible securities risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> Convertible securities are subject to market and interest rate risk and credit risk. When the market price of the equity security underlying a convertible security decreases, the convertible security tends to trade on the basis of its yield and other fixed income characteristics, making the convertible security more susceptible to credit and interest rate risks. When the market price of such equity security rises, the convertible security tends to trade on the basis of its equity conversion features and be more exposed to market risk. Convertible securities are typically issued by smaller capitalized companies whose stock prices may be volatile. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Short sales risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The fund may suffer significant losses if assets that the fund sells short appreciate rather than depreciate in value. The amount of any gain will be decreased, and the amount of any loss increased, by the amount of the premium, dividends, interest or expenses the fund may be required to pay in connection with the short sale. While the possible loss on a security that is purchased is limited to the price paid for the security, there is no limit on the amount of loss on a security that is sold short. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Investment Company and ETF risk. </b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">Investing in securities issued by investment companies and exchange-traded funds ("ETFs") involves risks similar to those of investing directly in the securities and other assets held by the investment company or ETF. The fund will indirectly bear its pro rata share of the fees and expenses incurred by any fund it invests in, including advisory fees, and will pay brokerage commissions in connection with the purchase and sale of shares of ETFs. Investing in hedge funds and&nbsp;other privately offered funds involves the additional risks of limited liquidity and potentially significant volatility. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Cash management and defensive investing risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The value of the investments held by the fund for cash management or defensive investing purposes may be affected by changing interest rates and by changes in credit ratings of the investments. If the fund holds cash uninvested it could be subject to the credit risk of the depository institution holding the cash. If a significant amount of the fund's assets are used for cash management or defensive investing purposes, it may not be pursuing its principal investment strategies and may not achieve its investment objective. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Valuation risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The sales price the fund could receive for any particular portfolio investment may differ from the fund's valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer shares or lower redemption proceeds than they would have received if the fund had not fair-valued the security or had used a different valuation methodology. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Risk of increase in expenses.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> Your actual costs of investing in the fund may be higher than the expenses shown in "Annual fund operating expenses" for a variety of reasons. For example, expense ratios may be higher than those shown if a fee limitation is changed or terminated or if average net assets decrease. Net assets are more likely to decrease and fund expense ratios are more likely to increase when markets are volatile. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">These risks are discussed in more detail in this Prospectus or in the SAI.</font></p></div></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]24false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#508541" size="6">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]25false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <div> <div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">The accompanying bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows the fund's Class I performance for the last calendar year. The table shows the average annual total returns of the fund and also compares the fund's performance with the average annual total returns of an index or other benchmark. </font></p></div></div> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">The fund makes updated performance information available at the fund's website,&nbsp;<font class="_mt"><font class="_mt">http://www.leggmason.com/individualinvestors/products/mutual-funds/annualized_performance</font> (select share class)</font>, or by calling the fund at&nbsp;<font class="_mt">1-877-721-1926.</font> </font></p> <div class="MetaData"> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> </font><font style="font-family: ARIAL;" class="_mt" size="2"><i><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.</font></i></font></p></div></div></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]26false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><font color="#508541" class="_mt"><font class="_mt"><strong><font size="2" class="_mt">Total returns </font></strong><font style="font-family: ARIAL;" class="_mt" size="1">(before taxes)</font><font style="font-family: ARIAL;" class="_mt" size="2"><b> (%)</b></font></font></font></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalseBar Chart [Heading]27false0rr_BarChartTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.leggmason.com/role/ScheduleAnnualTotalReturnsLeggMasonManagerSelectLargeCapValueFundBarChart column period compact * column primary compact * row dei_LegalEntityAxis compact cik001474103_S000027199Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalseBarChart2.jpg<div> &lt;div style="display:none;" &gt;~ http://www.leggmason.com/role/ScheduleAnnualTotalReturnsLeggMasonManagerSelectLargeCapValueFundBarChart column period compact * column primary compact * row dei_LegalEntityAxis compact cik001474103_S000027199Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsehttp://www.leggmason.com/role/ScheduleAnnualTotalReturnsLeggMasonManagerSelectLargeCapValueFundBarChartfalsefalse000036 - Schedule - Annual Total Returns - Legg Mason Manager Select Large Cap Value Fundtruefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*5false0rr_AnnualReturn2010rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.11770.1177falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseAnnual Return 2010duration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik001474103_S000027199MemberRowrr_ProspectusShareClassAxisAxis*falsefalseLegg Mason Manager Select Large Cap Value Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000027199Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Irr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_C000082108Memberrr_ProspectusShareClassAxisexplicitMemberLegg Mason Manager Select Large Cap Value FundClass I0truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.11770.1177falsefalsefalsetruefalseOthernanafalsefalseLegg Mason Manager Select Large Cap Value Fund Class I11Annual Total Returns - Legg Mason Manager Select Large Cap Value Fund UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*Rowdei_LegalEntityAxisAxiscik001474103_S000027199MemberRowrr_ProspectusShareClassAxisAxis*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to BarChartData.No authoritative reference available.falsefalseBar Chart [Table]28false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: ARIAL;" color="#666666" size="1" class="_mt">Best quarter</font></p></div> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: ARIAL;" color="#666666" size="1" class="_mt">(ended 09/30/2010): <font class="_mt"><font style="font-family: ARIAL;" color="#666666" size="1" class="_mt"><font class="_mt"><font style="font-family: ARIAL;" color="#666666" size="1" class="_mt">10.04</font></font></font></font></font></p> <p style="margin-top: 0px; margin-bottom: 0px; font-size: 6px;">&nbsp;</p> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-family: ARIAL;" color="#666666" size="1" class="_mt">Worst quarter</font></p></div> <p style="margin-top: 0px; margin-bottom: 1px;"><font style="font-family: ARIAL;" color="#666666" size="1" class="_mt">(ended 06/30/2010): <font class="_mt"><font style="font-family: ARIAL;" color="#666666" size="1" class="_mt">(13.50)</font></font></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]29false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><font color="#508541" class="_mt"><font class="_mt"><strong><font size="2" class="_mt">Average annual total returns </font></strong><font style="font-family: ARIAL;" class="_mt" size="1">(for periods ended December&nbsp;31, 2010)</font><font style="font-family: ARIAL;" class="_mt" size="2"><b> (%)</b></font></font></font></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalsePerformance Table Heading30false0rr_PerformanceTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.leggmason.com/role/ScheduleAverageAnnualTotalReturnsTransposedLeggMasonManagerSelectLargeCapValueFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik001474103_S000027199Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.leggmason.com/role/ScheduleAverageAnnualTotalReturnsTransposedLeggMasonManagerSelectLargeCapValueFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik001474103_S000027199Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>truehttp://www.leggmason.com/role/ScheduleAverageAnnualTotalReturnsTransposedLeggMasonManagerSelectLargeCapValueFundfalsefalse000037 - Schedule - Average Annual Total Returns {Transposed} - {Legg Mason Manager Select Large Cap Value Fund}truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.11770.1177falsefalsefalsetruefalse2truetruetrue0.1090.109falsefalsefalsetruefalse3truetruetrue0.07650.0765falsefalsefalsetruefalse4truetruetrue0.15510.1551falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse1 yearduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.11420.1142falsefalsefalsetruefalse2truetruetrue0.10620.1062falsefalsefalsetruefalse3truetruetrue0.09260.0926falsefalsefalsetruefalse4truetruetrue0.14840.1484falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseSince inceptionduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002009-12-01falsefalsetruetruefalse2falsetruefalse00falsefalsetruetruefalse3falsetruefalse00falsefalsetruetruefalse4falsetruefalse002009-12-01falsefalsetruetruefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalseInception dateduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik001474103_S000027199MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseLegg Mason Manager Select Large Cap Value Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000027199Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Irr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_C000082108Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberLegg Mason Manager Select Large Cap Value FundClass IBefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.11770.1177falsefalsefalsetruefalse2truetruetrue0.11420.1142falsefalsefalsetruefalse3falsetruefalse002009-12-012009-12-01falsefalsetruetruefalseOthernanafalsefalseClass I2falseRowdei_LegalEntityAxisAxiscik001474103_S000027199MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseLegg Mason Manager Select Large Cap Value Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000027199Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Irr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_C000082108Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn after taxes on distributionsrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsMemberrr_PerformanceMeasureAxisexplicitMemberLegg Mason Manager Select Large Cap Value FundClass IReturn after taxes on distributionsStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.1090.109falsefalsefalsetruefalse2truetruetrue0.10620.1062falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsefalsefalseOthernanafalsefalseClass I Return after taxes on distributions3falseRowdei_LegalEntityAxisAxiscik001474103_S000027199MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseLegg Mason Manager Select Large Cap Value Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000027199Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Irr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_C000082108Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn after taxes on distributions and sale of fund sharesrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsAndSalesMemberrr_PerformanceMeasureAxisexplicitMemberLegg Mason Manager Select Large Cap Value FundClass IReturn after taxes on distributions and sale of fund sharesStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.07650.0765falsefalsefalsetruefalse2truetruetrue0.09260.0926falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsefalsefalseOthernanafalsefalseClass I Return after taxes on distributions and sale of fund shares4falseRowdei_LegalEntityAxisAxiscik001474103_S000027199MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseLegg Mason Manager Select Large Cap Value Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000027199Memberdei_LegalEntityAxisexplicitMembertruefalseShare Classesrr_ProspectusShareClassAxisrr_ShareClassDomainrr_ProspectusShareClassAxisexplicitMemberfalsefalseRussell 1000 Value Index (reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_Russell1000ValueIndexReflectsNoDeductionForFeesExpensesOrTaxesMemberrr_PerformanceMeasureAxisexplicitMemberLegg Mason Manager Select Large Cap Value FundShare ClassesRussell 1000 Value Index (reflects no deduction for fees, expenses or taxes)Standard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.15510.1551falsefalsefalsetruefalse2truetruetrue0.14840.1484falsefalsefalsetruefalse3falsetruefalse002009-12-012009-12-01falsefalsetruetruefalseOthernanafalsefalseRussell 1000 Value Index (reflects no deduction for fees, expenses or taxes)34Average Annual Total Returns - Legg Mason Manager Select Large Cap Value FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_LegalEntityAxisAxiscik001474103_S000027199MemberRowrr_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]31false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 12px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"><font class="_mt"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">The after-tax returns for Class I shares are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.</font>&nbsp;</font><font class="_mt">Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. </font></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 Narrative129Risk/Return Summary - Legg Mason Manager Select Large Cap Value Fund (Legg Mason Manager Select Large Cap Value Fund)UnKnownUnKnownUnKnownUnKnownfalsetrue