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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName METROPOLITAN WEST FUNDS
Prospectus Date rr_ProspectusDate Sep. 28, 2011
Institutional | Unconstrained Bond Fund | Class I
 
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_MaximumAccountFee none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.59% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.24%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 1.49% [2]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.75%
1 Year rr_ExpenseExampleYear01 77
3 Years rr_ExpenseExampleYear03 557
Institutional | Unconstrained Bond Fund
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Objective [Heading] rr_ObjectiveHeading
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Expense [Heading] rr_ExpenseHeading
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2012
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Based on estimated amounts for the current fiscal year
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
Strategy [Heading] rr_StrategyHeading
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Risk [Heading] rr_RiskHeading
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Risk Lose Money [Text] rr_RiskLoseMoney You can lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Fund is new and does not have a full calendar year of performance or financial information to present. Once it has been in operation a full calendar year, performance (including total return) and financial information will be presented.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 241-4671
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.mwamllc.com
[1] Based on estimated amounts for the current fiscal year.
[2] Metropolitan West Asset Management, LLC (the "Adviser") has contractually agreed to waive advisory fees and/or reimburse expenses, including distribution expenses, to limit the Fund's total annual operating expense to 0.75%. For purposes of the expense limitation, operating expenses do not include interest, taxes, brokerage commissions, short sale dividend expenses, swap interest expenses, and any expenses incurred in connection with any merger or reorganization or extraordinary expenses such as litigation. This contract will remain in place until July 31, 2012. Although it does not expect to do so, the Board of Trustees is permitted to terminate that contract sooner in its discretion with written notice to the Adviser.