S000001149 [Member] Performance Management - TCW METWEST HIGH YIELD BOND FUND

Mar. 31, 2025

Prospectus [Line Items]

Bar Chart and Performance Table [Heading]

Performance Information

Performance Narrative [Text Block]

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 and a secondary benchmark 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 September 30, 2002 and March 31, 2003, 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 Past Does Not Indicate Future [Text]

The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Performance Information Illustrates Variability of Returns [Text]

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 and a secondary benchmark index.

Bar Chart [Heading]

High Yield Bond Fund – Class M Shares Annual Total Returns for Years Ended 12/31

Bar Chart Closing [Text Block]

Year‑to‑Date Total Return of Class M Shares as of June 30, 2025: 4.70%

Highest:	8.60%	(quarter ended June 30, 2020)
Lowest:	-10.02%	(quarter ended June 30, 2022)

Performance Table Heading

Average Annual Total Returns (For Periods Ended December 31, 2024)

Performance Table Narrative

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.

Performance Table Uses Highest Federal Rate

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

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

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 Footnotes

¹  The “Return After Taxes on Distributions and Sale of Shares” is higher than the “Return After Taxes on Distributions” because of realized losses that would have been sustained upon sale of Fund shares immediately after the relevant period.

Performance Table One Class of after Tax Shown [Text]

After‑tax returns are shown for only Class M Shares. After‑tax returns for other classes will vary.

Performance Availability Website Address [Text]

www.tcw.com

Performance Availability Phone [Text]

(800) 241‑4671

CLASS M

Prospectus [Line Items]

Year to Date Return, Label [Optional Text]

Year‑to‑Date Total Return of Class M Shares as of June 30, 2025:

Bar Chart, Year to Date Return

4.70%

Bar Chart, Year to Date Return, Date

Jun. 30, 2025

Highest Quarterly Return, Label [Optional Text]

Highest:

Highest Quarterly Return

8.60%

Highest Quarterly Return, Date

Jun. 30, 2020

Lowest Quarterly Return, Label [Optional Text]

Lowest:

Lowest Quarterly Return

(10.02%)

Lowest Quarterly Return, Date

Jun. 30, 2022