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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName METROPOLITAN WEST FUNDS
Prospectus Date rr_ProspectusDate Jul. 27, 2018
METROPOLITAN WEST STRATEGIC INCOME FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Metropolitan West Strategic Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Strategic Income Fund seeks to maximize long-term total return without tracking any particular markets or indices.
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. You may pay additional fees to broker-dealers or other financial intermediaries for the purchase of Class I 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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2019
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 32% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 32.00%
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. The cost for the Fund reflects the net expenses of the Fund that result from the contractual expense limitation in the first year only (through July 31, 2019). 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 using techniques intended to provide absolute (positive) returns in all markets and employs a strategy intended to produce high income while exploiting disparities or inefficiencies in markets. The Fund focuses on inefficiencies related to secured or asset-backed debt compared with unsecured and subordinated debt or equity of companies and issuers. Additionally, the Fund focuses on longer-term cyclical anomalies in the fixed income markets to both enhance yield and realize potential price appreciation. These anomalies include shifts in the portfolio’s duration, yield curve anomalies, and sector and issue-specific dislocations.

The major strategies employed by the Adviser include relative value/arbitrage strategies (capital structure arbitrage, commodities/futures arbitrage, convertible arbitrage, and interest rate arbitrage), trading/market timing strategies (interest rate timing, yield curve relationship and arbitrage and sector and issue allocations), income strategies, high yield investment strategies, long-short or market-neutral equity strategies and event driven and special situation strategies.

To implement some or all of these strategies, the Fund’s portfolio typically includes corporate bonds, mezzanine investments, swaps and other derivatives (futures, options and credit default swaps), currency futures and options, bank loans, preferred stock, common stock, warrants, convertible bonds, municipal securities, mortgage-related and asset-backed securities (including collateralized debt obligations, which in turn include collateralized bond obligations and collateralized loan obligations), derivatives of asset-backed securities (including those involving net interest margins, “NIMs”), foreign securities, U.S. Treasuries and agency securities, cash and cash equivalents, private placements, defaulted debt securities, restricted securities and unrated securities. Many of these investments may have interest rates that are fixed, variable or floating.

Under normal circumstances, the average dollar-weighted credit quality of the Fund’s long-term debt investments will be securities that are recognized as investment grade securities or are unrated and determined to be of similar quality. The Fund may invest up to 50% of its assets in debt securities rated below investment grade, or if unrated, of comparable quality in the opinion of the Adviser.

The Fund invests in the U.S. and abroad, including emerging markets. The Fund may invest up to 25% of its assets in foreign securities that are denominated in U.S. dollars. Investments in securities of foreign issuers that are not denominated in U.S. dollars are limited to a maximum of 30% of the Fund’s assets. The Fund may also invest up to 15% of its assets in emerging market foreign securities. 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.
  • Issuer/Credit Risk: the Adviser expects to invest in high yield securities, which are considered speculative and are subject to greater volatility and risk of loss than investment grade securities, particularly in deteriorating economic conditions.
  • Derivatives Risk: the risk of investing in derivative instruments, which includes liquidity, interest rate, market, credit and management risks as well as risks related to mispricing or improper valuation. 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. These investments can create investment leverage and may create additional risks that may subject the Fund to greater volatility and less liquidity than investments in more traditional securities.
  • Swap Agreements Risk: the risk of using swaps, which, in addition to risks applicable to derivatives generally, includes: (1) the inability to assign a swap contract without the consent of the counterparty; (2) potential default of the counterparty to a swap for those not traded through a central counterparty; (3) absence of a liquid secondary market for any particular swap at any time; and (4) possible inability of the Fund to close out a swap transaction at a time that otherwise would be favorable for it to do so.
  • High Yield Risk: the risk that these debt securities have a higher degree of default risk and may be less liquid and subject to greater price volatility than investment grade securities.
  • Unrated Securities Risk: the risk that unrated securities may be less liquid than comparable rated securities, and the risk that the Adviser may not accurately evaluate the security’s comparative credit rating.
  • Event Driven Strategies Risk: Event driven investing involves attempting to predict the outcome of a particular transaction as well as the best time at which to commit capital to such a transaction. The success or failure of this strategy usually depends on whether the Adviser accurately predicts the outcome and timing of the transaction event. Also, major market declines that could cause transactions to be re-priced or fail may have a negative impact on the strategy.
  • Leverage Risk: the risk that leverage may result from certain transactions, including the use of derivatives and borrowing. This may impair the Fund’s liquidity, cause it to liquidate positions at an unfavorable time, increase its volatility or otherwise cause it not to achieve its intended result. The Fund will reduce leverage risk by either segregating an equal amount of liquid assets or “covering” the transactions that introduce such risk.
  • Liquidity Risk: the risk that lack of a ready market or restrictions on resale may limit the ability of the Fund to sell a security at an advantageous time or price. In addition, the Fund, by itself or together with other accounts managed by the Adviser, may hold a position in a security that is large relative to the typical trading volume for that security, which can make it difficult for the Fund to dispose of the position at an advantageous time or price. Although the Fund is normally able to sell loans within seven days, a substantial portion of the loans held by the Fund will also experience delayed settlement beyond that period, which can impair the ability of the Fund to pay redemptions or to re-invest proceeds, or may require the Fund to borrow to meet redemptions. Over recent years, the fixed-income markets have grown more than the ability of dealers to make markets, which can further constrain liquidity and increase the volatility of portfolio valuations. High levels of redemptions in bond funds in response to market conditions could cause greater losses as a result. Regulations such as the Volcker Rule or future regulations may further constrain the ability of market participants to create liquidity, particularly in times of increased market volatility. The liquidity of the Fund’s assets may change over time.
  • Foreign Currency Risk: the risk that foreign currencies will decline in value relative to the U.S. dollar and affect the Fund’s investments in foreign (non-U.S.) currencies or in securities that trade in, and receive revenues in, or in derivatives that provide exposure to, foreign (non-U.S.) currencies.
  • Foreign Investing Risk: the risk that the value of the Fund’s foreign investments will fluctuate with market conditions, currency exchange rates and the economic and political climates of the foreign countries where the Fund invests or has exposure.
  • Emerging Markets Risk: the risk that the value of the Fund’s emerging markets investments will decline due to the greater degree of economic, political and social instability of emerging or developing countries as compared to developed countries, and the risk that emerging market debt may also be of lower credit quality and subject to greater risk of default.
  • Sovereign Debt Risk: the risk that investments in debt obligations of sovereign governments may lose value due to the government entity’s unwillingness or inability to repay principal and interest when due in accordance with the terms of the debt or otherwise in a timely manner. The Fund may have limited (or no) recourse in the event of a default because bankruptcy, moratorium and other similar laws applicable to issuers of sovereign debt obligations may be substantially different from those applicable to private issuers and any recourse may be subject to the political climate in the relevant country.
  • Government Securities Risk: the risk that debt securities issued or guaranteed by certain U.S. Government agencies, instrumentalities, and sponsored enterprises are not supported by the full faith and credit of the U.S. Government, and so investments in their securities or obligations issued by them involve credit risk greater than investments in other types of U.S. Government securities.
  • Securities Selection Risk: the risk that the securities held by the Fund may 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.
  • Asset-Backed and Mortgage-Backed Securities Investment Risk: the risk that the impairment of the value of the collateral underlying the security in which the Fund invests, such as non-payment of loans, will result in a reduction in the value of the security. The value of these securities may also fluctuate in response to the market’s perception of the value of issuers or collateral.
  • 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 become longer-term securities that fluctuate more widely in response to changes in interest rates than shorter term securities.
  • Mezzanine Securities Risk: Mezzanine securities generally are rated below investment grade and frequently are unrated and present many of the same risks as senior loans, second lien loans and non-investment grade bonds. However, unlike senior loans and second lien loans, mezzanine securities are not a senior or secondary secured obligation of the related borrower. They typically are the most subordinated debt obligation in an issuer’s capital structure. Mezzanine securities also may often be unsecured. Mezzanine securities therefore are subject to the additional risk that the cash flow of the related borrower and the property securing the loan may be insufficient to repay the scheduled obligation after giving effect to any senior obligations of the related borrower. Mezzanine securities are also expected to be a highly illiquid investment. Mezzanine securities will be subject to certain additional risks to the extent that such loans may not be protected by financial covenants or limitations upon additional indebtedness. Investment in mezzanine securities is a highly specialized investment practice that depends more heavily on independent credit analysis than investments in other types of debt obligations.
  • Short Sales Risk: short sales are speculative investments that will cause the Fund to lose money if the value of a security does not go down as the Adviser expects. The risk of loss is theoretically unlimited if the value of the security sold short continues to increase. In addition, the use of borrowing and short sales may cause the Fund to have higher expenses (especially interest and dividend expenses) than those of other mutual funds.
Please see “Principal Risks” and “Other 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 bar chart shows performance of the Fund’s Class M shares. Class M performance is lower than Class I performance because Class I has lower expenses than Class M. The table compares the average annual total returns of the Fund to a broad-based securities market index. Total returns would have been lower if certain fees and expenses had not been waived or reimbursed. The inception dates of Class M shares and Class I shares of the Fund are June 30, 2003 and March 31, 2004, respectively. 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.tcw.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 bar chart shows performance of the Fund’s Class M shares. Class M performance is lower than Class I performance because Class I has lower expenses than Class M. The table compares the average annual total returns of the Fund to a broad-based securities market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 241-4671
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.tcw.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 Strategic Income Fund – Class M Shares
Annual Total Returns for Years Ended 12/31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Year-to-Date Total Return of Class M Shares as of June 30, 2018: -0.19%

Highest:        16.40%    (quarter ended September 30, 2009)
Lowest:        -16.56%    (quarter ended December 31, 2008)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns

(For Periods Ended December 31, 2017)
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 One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for only Class M Shares. After-tax returns for other classes will vary.
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. After-tax returns are shown for only Class M Shares. After-tax returns for other classes will vary. 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.
METROPOLITAN WEST STRATEGIC INCOME FUND | M Class  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (Fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 1.88% [1]
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Expenses rr_Component1OtherExpensesOverAssets 0.07% [2]
Other Expenses rr_OtherExpensesOverAssets 0.32%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.45%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [3]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.35%
1 Year rr_ExpenseExampleYear01 $ 238
3 Years rr_ExpenseExampleYear03 754
5 Years rr_ExpenseExampleYear05 1,297
10 Years rr_ExpenseExampleYear10 $ 2,779
2008 rr_AnnualReturn2008 (28.05%)
2009 rr_AnnualReturn2009 31.69%
2010 rr_AnnualReturn2010 18.15%
2011 rr_AnnualReturn2011 1.51%
2012 rr_AnnualReturn2012 12.46%
2013 rr_AnnualReturn2013 3.75%
2014 rr_AnnualReturn2014 2.54%
2015 rr_AnnualReturn2015 0.11%
2016 rr_AnnualReturn2016 2.89%
2017 rr_AnnualReturn2017 3.79%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date Total Return of Class M Shares as of June 30, 2018:
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.19%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.40%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.56%)
1 Year rr_AverageAnnualReturnYear01 3.79%
5 Years rr_AverageAnnualReturnYear05 2.61%
10 Years rr_AverageAnnualReturnYear10 3.81%
Since Inception rr_AverageAnnualReturnSinceInception 4.27%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2003
METROPOLITAN WEST STRATEGIC INCOME FUND | I Class  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (Fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 1.88% [1]
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Expenses rr_Component1OtherExpensesOverAssets 0.08% [2]
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.22%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [3]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.10%
1 Year rr_ExpenseExampleYear01 $ 213
3 Years rr_ExpenseExampleYear03 683
5 Years rr_ExpenseExampleYear05 1,179
10 Years rr_ExpenseExampleYear10 $ 2,545
1 Year rr_AverageAnnualReturnYear01 4.20%
5 Years rr_AverageAnnualReturnYear05 2.91%
10 Years rr_AverageAnnualReturnYear10 4.08%
Since Inception rr_AverageAnnualReturnSinceInception 3.64%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2004
METROPOLITAN WEST STRATEGIC INCOME FUND | After Taxes on Distributions | M Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.24%
5 Years rr_AverageAnnualReturnYear05 1.28%
10 Years rr_AverageAnnualReturnYear10 1.56%
Since Inception rr_AverageAnnualReturnSinceInception 2.15%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2003
METROPOLITAN WEST STRATEGIC INCOME FUND | After Taxes on Distributions and Sale of Fund Shares | M Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.14%
5 Years rr_AverageAnnualReturnYear05 1.38%
10 Years rr_AverageAnnualReturnYear10 1.92%
Since Inception rr_AverageAnnualReturnSinceInception 2.41%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2003
METROPOLITAN WEST STRATEGIC INCOME FUND | BofA Merrill Lynch 3-Month U.S. Treasury Bill Index +2%  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.82%
5 Years rr_AverageAnnualReturnYear05 2.26%
10 Years rr_AverageAnnualReturnYear10 2.40%
Since Inception rr_AverageAnnualReturnSinceInception 3.30%
[1] The management fee paid to the Adviser for providing services to the Fund consists of a basic fee at an annual rate of 1.20% of the Fund’s average daily net assets and a positive or negative performance adjustment of up to an annual rate of 0.70% (applied to the average net assets for the rolling 12-month performance period), resulting in a total minimum fee of 0.50% and a total maximum fee of 1.90%. The average monthly management fee for the period from April 1, 2017 through March 31, 2018 was 1.88% (annual rate) based on average net assets for the year ended March 31, 2018.
[2] The Fund is authorized to compensate broker-dealers and other third-party intermediaries up to 0.10% (10 basis points) of the M and I Class assets serviced by that intermediary for shareholder services.
[3] Metropolitan West Asset Management, LLC (the "Adviser") has contractually agreed to reduce advisory fees and/or reimburse expenses, including distribution expenses, to limit the Fund's total annual operating expenses (excluding interest, taxes, brokerage commissions, short sale dividend expenses, acquired fund fees and expenses, and any expenses incurred in connection with any merger or reorganization or extraordinary expenses such as litigation) to the net expenses shown in the table for the applicable share class. The Adviser may recoup reduced fees and expenses only within three years, provided that the recoupment does not cause the Fund's annual expense ratio to exceed the lesser of (i) the expense limitation applicable at the time of that fee waiver and/or expense reimbursement or (ii) the expense limitation in effect at the time of recoupment. This contract will remain in place until July 31, 2019. 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.