2.2.0.25truefalse000011 - Document - Risk/Return Summary {Unlabeled} - Legg Mason BW Diversified Large Cap Value Fundfalsefalsetrue1falsefalseUSDtruefalse{dei_LegalEntityAxis} : S000029727 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20114http://www.sec.gov/CIK0001474103duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik001474103_S000029727Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000029727Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 24px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="6">Legg Mason BW </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="6">Diversified Large Cap </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="6">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 falsefalse4false0rr_ObjectiveHeadingrrfalsenadurationNo 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"><a name="tx139672_1"> </a>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 falsefalse5false0rr_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 capital appreciation. </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 falsefalse6false0rr_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"><a name="tx139672_2"> </a>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 falsefalse7false0rr_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"><font class="_mt"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least&nbsp;<font class="_mt">$25,000</font> in funds sold by Legg Mason Investor Services, LLC ("LMIS"), the fund's distributor. </font></font>More information about these and other discounts is available from your financial intermediary, in this Prospectus on page&nbsp;15 under the heading "Sales charges" and in the fund's statement of additional information ("SAI") on page 33 under the heading "Sales Charge Waivers and Reductions." </font></p> <p style="margin-top: 6px; 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 falsefalse8false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px; font-size: 12px;"><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 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(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 falsefalse0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025falsefalsefalsetruefalse2truetruetrue0.010.01falsefalsefalsetruefalse3truetruetrue0.00250.0025falsefalsefalsetruefalse4truetruetrue0.0050.005falsefalsefalsetruefalse5truetruetrue0.010.01falsefalsefalsetruefalse6truetruetrue00falsefalsefalsetruefalse7truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse3falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00460.0046[1]falsefalsefalsetruefalse2truetruetrue0.00460.0046[1]falsefalsefalsetruefalse3truetruetrue0.00460.0046[1]falsefalsefalsetruefalse4truetruetrue0.00460.0046[1]falsefalsefalsetruefalse5truetruetrue0.00460.0046[1]falsefalsefalsetruefalse6truetruetrue0.00360.0036[1]falsefalsefalsetruefalse7truetruetrue0.00260.0026[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 falsefalse0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.00460.0046falsefalsefalsetruefalse2truetruetrue0.00460.0046falsefalsefalsetruefalse3truetruetrue0.00460.0046falsefalsefalsetruefalse4truetruetrue0.00460.0046falsefalsefalsetruefalse5truetruetrue0.00460.0046falsefalsefalsetruefalse6truetruetrue0.00360.0036falsefalsefalsetruefalse7truetruetrue0.00260.0026falsefalsefalsetruefalseOthernanafalsefalse4falseRowprimaryElement*8false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.01460.0146falsefalsefalsetruefalse2truetruetrue0.02210.0221falsefalsefalsetruefalse3truetruetrue0.01460.0146falsefalsefalsetruefalse4truetruetrue0.01710.0171falsefalsefalsetruefalse5truetruetrue0.02210.0221falsefalsefalsetruefalse6truetruetrue0.01110.0111falsefalsefalsetruefalse7truetruetrue0.01010.0101falsefalsefalsetruefalseOtherrr: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 truefalse0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01460.0146falsefalsefalsetruefalse2truetruetrue0.02210.0221falsefalsefalsetruefalse3truetruetrue0.01460.0146falsefalsefalsetruefalse4truetruetrue0.01710.0171falsefalsefalsetruefalse5truetruetrue0.02210.0221falsefalsefalsetruefalse6truetruetrue0.01110.0111falsefalsefalsetruefalse7truetruetrue0.01010.0101falsefalsefalsetruefalseOthernanafalsefalse5falseRowprimaryElement*9false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0016-0.0016falsefalsefalsetruefalse2truetruetrue-0.0016-0.0016falsefalsefalsetruefalse3truetruetrue-0.0016-0.0016falsefalsefalsetruefalse4truetruetrue-0.0016-0.0016falsefalsefalsetruefalse5truetruetrue-0.0016-0.0016falsefalsefalsetruefalse6truetruetrue-0.0016-0.0016falsefalsefalsetruefalse7truetruetrue-0.0016-0.0016falsefalsefalsetruefalseOtherrr: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 falsefalse0rr_FeeWaiverOrReimbursementOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0016-0.0016falsefalsefalsetruefalse2truetruetrue-0.0016-0.0016falsefalsefalsetruefalse3truetruetrue-0.0016-0.0016falsefalsefalsetruefalse4truetruetrue-0.0016-0.0016falsefalsefalsetruefalse5truetruetrue-0.0016-0.0016falsefalsefalsetruefalse6truetruetrue-0.0016-0.0016falsefalsefalsetruefalse7truetruetrue-0.0016-0.0016falsefalsefalsetruefalseOthernanafalsefalse6falseRowprimaryElement*10false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.0130.013[2]falsefalsefalsetruefalse2truetruetrue0.02050.0205[2]falsefalsefalsetruefalse3truetruetrue0.0130.013[2]falsefalsefalsetruefalse4truetruetrue0.01550.0155[2]falsefalsefalsetruefalse5truetruetrue0.02050.0205[2]falsefalsefalsetruefalse6truetruetrue0.00950.0095[2]falsefalsefalsetruefalse7truetruetrue0.00850.0085[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 truefalse0rr_NetExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.0130.013falsefalsefalsetruefalse2truetruetrue0.02050.0205falsefalsefalsetruefalse3truetruetrue0.0130.013falsefalsefalsetruefalse4truetruetrue0.01550.0155falsefalsefalsetruefalse5truetruetrue0.02050.0205falsefalsefalsetruefalse6truetruetrue0.00950.0095falsefalsefalsetruefalse7truetruetrue0.00850.0085falsefalsefalsetruefalseOthernanafalsefalse1 "Other expenses" are based on estimated amounts for the current fiscal year. 2 The manager has agreed to forgo fees and/or reimburse operating expenses (other than interest, 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 1.30%, 2.05%, 1.30%, 1.55%, 2.05%, 0.95% and 0.85% for Class A, C, FI, R, R1, I and IS shares, respectively. In addition, total annual fund operating expenses for Class IS shares will not exceed total annual fund operating expenses for Class I shares. These arrangements 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 a 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.76Annual Fund Operating Expenses - Legg Mason BW Diversified Large Cap Value FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxiscik001474103_S000029727MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalse12false0rr_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 falsefalse13false0rr_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-size: 1px;">&nbsp;</p> <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 falsefalse14false0rr_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. 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 falsefalse15false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.leggmason.com/role/ScheduleExpenseExampleTransposedLeggMasonBwDiversifiedLargeCapValueFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik001474103_S000029727Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.leggmason.com/role/ScheduleExpenseExampleTransposedLeggMasonBwDiversifiedLargeCapValueFund row period compact * row primary compact * column dei_LegalEntityAxis compact cik001474103_S000029727Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.leggmason.com/role/ScheduleExpenseExampleTransposedLeggMasonBwDiversifiedLargeCapValueFundfalsefalse000014 - Schedule - Expense Example {Transposed} -{ Legg Mason BW Diversified Large Cap Value Fund}truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue700700falsefalsefalsetruefalse2truefalsetrue308308falsefalsefalsetruefalse3truefalsetrue132132falsefalsefalsetruefalse4truefalsetrue158158falsefalsefalsetruefalse5truefalsetrue208208falsefalsefalsetruefalse6truefalsetrue9797falsefalsefalsetruefalse7truefalsetrue8787falsefalsefalsetruefalseMonetaryrr: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 falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue995995falsefalsefalsetruefalse2truefalsetrue676676falsefalsefalsetruefalse3truefalsetrue446446falsefalsefalsetruefalse4truefalsetrue524524falsefalsefalsetruefalse5truefalsetrue676676falsefalsefalsetruefalse6truefalsetrue337337falsefalsefalsetruefalse7truefalsetrue306306falsefalsefalsetruefalseMonetaryrr: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 falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_LegalEntityAxisAxiscik001474103_S000029727MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseLegg Mason BW Diversified Large Cap Value Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_S000029727Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik001474103_C000091408Memberrr_ProspectusShareClassAxisexplicitMemberLegg Mason BW Diversified Large Cap Value FundClass 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(USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_LegalEntityAxisAxiscik001474103_S000029727MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExampleNoRedemption.No authoritative reference available.falsefalse18false0rr_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 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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 falsefalse19false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo 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">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 September&nbsp;7, 2010. During the fiscal period ended September&nbsp;30, 2010, the fund's portfolio turnover rate was&nbsp;<font class="_mt">6.0%</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. 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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 falsefalse21false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="padding-bottom: 0px; margin-top: 8px; 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 fund normally invests at least 80% of its net assets in equity securities of large capitalization companies. </font></font>Large capitalization companies are those companies with market capitalizations similar to companies in the Russell 1000<font style="font-family: ARIAL;" class="_mt" color="#666666" size="1"><sup style="position: relative; bottom: 0.8ex; vertical-align: baseline;">&#174;</sup></font> Index (the "Index").&nbsp;The size of the companies in the Index changes with market conditions and the composition of the Index. As of December&nbsp;31, 2010, the median market capitalization of a company in the Index was approximately $5,299 million and the dollar-weighted average market capitalization of the companies in the Index was approximately $78.7 billion. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">The fund invests primarily in equity securities that, in the investment adviser's opinion, are undervalued or out of favor. The investment adviser invests in securities that meet its value criteria, based on both quantitative and fundamental analysis.&nbsp;The fund expects to hold approximately 150-250 stocks under normal market conditions. </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 in foreign equity securities, either directly or through depositary receipts. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">The fund may take temporary defensive and cash management positions; in such a case, the fund may not be pursuing its principal investment strategies and may not achieve its investment objective.</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 falsefalse22false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 18px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#508541" size="6"><a name="tx139672_4"> </a>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 falsefalse23false0rr_RiskNarrativeTextBlockrrfalsenadurationNo 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">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.&nbsp;<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. </font></p> <p style="margin-top: 8px; margin-bottom: 0px;"><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2">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>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 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>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. </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>Special risks of companies undergoing reorganization or restructuring.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> Investing in companies undergoing reorganization or restructuring involves special risks including that the transaction may not be completed on the terms or time frame contemplated, it may be difficult to obtain information on the financial condition of such companies, the issuer's management may be addressing a type of situation with which it has little experience, and the fact that the market prices of such securities are subject to above-average price 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 are lower than estimated. Net assets are more likely to be less than estimated 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"> </font><font style="font-family: ARIAL;" class="_mt" color="#508541" size="2"><b>Funds of funds investments risk.</b></font><font style="font-family: ARIAL;" class="_mt" color="#666666" size="2"> The fund may be an investment option for other Legg Mason-advised mutual funds that are managed as "funds of funds." 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