S000013857 [Member] Fees and Expenses - TCW Conservative Allocation Fund	Oct. 31, 2025
Prospectus [Line Items]
Expense Heading [Optional Text]	Fees and Expenses of the Fund
Expense Narrative [Text Block]	This table describes the fees and expenses you may pay if you buy, hold and sell shares of the Fund. You may pay additional fees or commissions to broker-dealers or other financial intermediaries for the purchase of Class I shares of the Fund, which are not reflected in the table below.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	The “Total Annual Fund Operating Expenses” and “Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement” do not correlate to the corresponding ratios included in the Fund’s Financial Highlights for each class of shares because those ratios do not reflect indirect expenses, such as “Acquired Fund Fees and Expenses.”
Shareholder Fees Caption [Optional Text]	Shareholder Fees (Fees paid directly from your investment)
Operating Expenses Caption [Optional Text]	Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading]	Example
Expense Example Narrative [Text Block]	This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all 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 of investing in the Fund reflects the net expenses of the Fund that result from the contractual expense limitation in the first year only (through March 1, 2027). Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Portfolio Turnover [Heading]	Portfolio Turnover
Portfolio Turnover [Text Block]	The Fund pays transaction costs 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 24.78% of the average value of its portfolio.
Portfolio Turnover, Rate	24.78%

S000013857 [Member] Fees and Expenses - TCW Conservative Allocation Fund

Oct. 31, 2025

Fees and Expenses of the Fund

This table describes the fees and expenses you may pay if you buy, hold and sell shares of the Fund. You may pay additional fees or commissions to broker-dealers or other financial intermediaries for the purchase of Class I shares of the Fund, which are not reflected in the table below.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

The “Total Annual Fund Operating Expenses” and “Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement” do not correlate to the corresponding ratios included in the Fund’s Financial Highlights for each class of shares because those ratios do not reflect indirect expenses, such as “Acquired Fund Fees and Expenses.”

Shareholder Fees Caption [Optional Text]

Shareholder Fees (Fees paid directly from your investment)

Operating Expenses Caption [Optional Text]

Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)

Expense Example [Heading]

Example

Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all 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 of investing in the Fund reflects the net expenses of the Fund that result from the contractual expense limitation in the first year only (through March 1, 2027). Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

The Fund pays transaction costs 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 24.78% of the average value of its portfolio.

Portfolio Turnover, Rate

24.78%