XML 33 R83.htm IDEA: XBRL DOCUMENT v2.4.0.6
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName METROPOLITAN WEST FUNDS
Prospectus Date rr_ProspectusDate Jul. 27, 2012
Institutional Class | METROPOLITAN WEST TOTAL RETURN BOND FUND
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
METROPOLITAN WEST TOTAL RETURN BOND FUND
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The TOTAL RETURN BOND FUND seeks to maximize long-term total return.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES
(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 156% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 156.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund pursues its objective by investing, under normal circumstances, at least 80% of its net assets in investment grade fixed income securities or unrated securities that are determined by the Adviser to be of similar quality. Up to 20% of the Fund’s net assets may be invested in securities rated below investment grade. The Fund also invests at least 80% of its net assets plus borrowings for investment purposes in fixed income securities it regards as bonds. Under normal conditions, the portfolio duration is two to eight years and the dollar-weighted average maturity ranges from two to fifteen years. The Fund invests in the U.S. and abroad, including emerging markets, and may purchase securities of varying maturities issued by domestic and foreign corporations and governments. The Adviser will focus the Fund’s portfolio holdings in areas of the bond market (based on quality, sector, coupon or maturity) that the Adviser believes to be relatively undervalued.

Investments include various types of bonds and other securities, typically corporate bonds, notes, collateralized bond obligations, collateralized debt obligations, mortgage-related and asset-backed securities, bank loans, money-market securities, swaps, futures, municipal securities, options, credit default swaps, private placements and restricted securities. These investments may have interest rates that are fixed, variable or floating.

Derivatives will be used in an effort to hedge investments, for risk management, or to increase income or gains for the Fund. The Fund may also seek to obtain market exposure to the securities in which it invests by entering into a series of purchase and sale contracts or by using other investment techniques.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Because the Fund holds securities with fluctuating market prices, the value of the Fund’s shares will vary as its portfolio securities increase or decrease in value. Therefore, the value of your investment in the Fund could go down as well as up. You can lose money by investing in the Fund.

The principal risks affecting the Fund that can cause a decline in value are:

Market Risk:    the risk that returns from the securities in which the Fund invests will underperform returns from the general securities markets or other types of securities.

Interest Rate Risk:    the risk that debt securities will decline in value because of changes in interest rates.

Credit Risk:    the risk that an issuer will default in the payment of principal and/or interest on a security.

Foreign Securities Risk:    The value of the Fund’s investments in foreign securities also depends on changing currency values, different political and economic environments and other overall economic conditions in the countries where the Fund invests. Emerging market debt securities tend to be of lower credit quality and subject to greater risk of default than higher rated securities from more developed markets.

Securities Selection Risk:    the risk that the securities held by the Fund will underperform other funds investing in the same asset class or benchmarks that are representative of the asset class because of the portfolio managers’ choice of securities.

Portfolio Management Risk:    the risk that an investment strategy may fail to produce the intended results.

Prepayment Risk of Asset-Backed and Mortgage-Backed Securities:    the risk that in times of declining interest rates, the Fund’s higher yielding securities will be prepaid and the Fund will have to replace them with securities having a lower yield.

Extension Risk of Asset-Backed and Mortgage-Backed Securities:    the risk that in times of rising interest rates prepayments will slow causing securities considered short or intermediate term to be long-term securities which fluctuate more widely in response to changes in interest rates than shorter term securities.

Asset-Backed Securities Investment Risk:    the risk that the impairment of the value of the collateral underlying the security such as non-payment of loans, will result in a reduction in the value of the security.

Derivatives and Swaps Risks:    the risk that changes in the value of a derivative may not correlate perfectly with the underlying asset, reference rate or index and the Fund could lose more than the principal amount invested. Swaps also involve the risks that the counterparty may default and the potential lack of liquidity.

Liquidity Risk:    the risk that there may be no willing buyer of the Fund’s portfolio securities and the Fund may have to sell those securities at a lower price or may not be able to sell the securities at all, each of which would have a negative effect on performance.

Please see “Additional Fund Information — Principal Risks” for a more detailed description of the risks of investing in the Fund.

Your investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity, or person.
Risk Lose Money [Text] rr_RiskLoseMoney You can lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Your investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity, or person.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance from year to year. The table compares the average annual total returns of the Fund to broad-based securities market index. Total returns would have been lower if certain fees and expenses had not been waived or reimbursed. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information for the Fund is available on our website at www.mwamllc.com or by calling (800) 241-4671.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance from year to year. The table compares the average annual total returns of the Fund to broad-based securities market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 241-4671
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.mwamllc.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading
ANNUAL TOTAL RETURNS FOR YEARS ENDED 12/31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

YEAR-TO-DATE TOTAL RETURN AS OF JUNE 30, 2012: 5.12%

Highest Performance Quarter

Lowest Performance Quarter

(quarter ended September 30, 2009) (quarter ended June 30, 2002)
8.20% –2.67%
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURNS
(FOR THE PERIODS ENDED DECEMBER 31, 2011)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred 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.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some cases, returns after taxes on distributions and sale of Fund shares may be higher than returns before taxes because the calculations assume that the investor received a tax deduction for any loss incurred on the sale of the shares.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. 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. In some cases, returns after taxes on distributions and sale of Fund shares may be higher than returns before taxes because the calculations assume that the investor received a tax deduction for any loss incurred on the sale of the shares.
Institutional Class | METROPOLITAN WEST TOTAL RETURN BOND FUND | Class I
  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.35%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.06% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.41%
1 Year rr_ExpenseExampleYear01 42
3 Years rr_ExpenseExampleYear03 132
5 Years rr_ExpenseExampleYear05 230
10 Years rr_ExpenseExampleYear10 518
2002 rr_AnnualReturn2002 (0.74%)
2003 rr_AnnualReturn2003 14.12%
2004 rr_AnnualReturn2004 5.37%
2005 rr_AnnualReturn2005 3.31%
2006 rr_AnnualReturn2006 7.22%
2007 rr_AnnualReturn2007 6.47%
2008 rr_AnnualReturn2008 (1.28%)
2009 rr_AnnualReturn2009 17.30%
2010 rr_AnnualReturn2010 11.66%
2011 rr_AnnualReturn2011 5.52%
Year to Date Return, Label rr_YearToDateReturnLabel YEAR-TO-DATE TOTAL RETURN AS OF JUNE 30, 2012:
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 5.12%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Performance Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.20%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Performance Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2002
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.67%)
1 Year rr_AverageAnnualReturnYear01 5.52%
5 Years rr_AverageAnnualReturnYear05 7.75%
10 Years rr_AverageAnnualReturnYear10 6.74%
Since Inception rr_AverageAnnualReturnSinceInception 7.21%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2000
Institutional Class | METROPOLITAN WEST TOTAL RETURN BOND FUND | Return After Taxes on Distributions | Class I
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.63%
5 Years rr_AverageAnnualReturnYear05 5.50%
10 Years rr_AverageAnnualReturnYear10 4.42%
Since Inception rr_AverageAnnualReturnSinceInception 4.67%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2000
Institutional Class | METROPOLITAN WEST TOTAL RETURN BOND FUND | Return After Taxes on Distributions and Sale of Fund Shares | Class I
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.63%
5 Years rr_AverageAnnualReturnYear05 5.31%
10 Years rr_AverageAnnualReturnYear10 4.36%
Since Inception rr_AverageAnnualReturnSinceInception 4.62%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2000
Institutional Class | METROPOLITAN WEST TOTAL RETURN BOND FUND | Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.84%
5 Years rr_AverageAnnualReturnYear05 6.50%
10 Years rr_AverageAnnualReturnYear10 5.78%
Since Inception rr_AverageAnnualReturnSinceInception 6.41%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2000
[1] "Other Expenses" excludes extraordinary non-recurring legal and tax expenses of 0.01%.