Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	LAUDUS TRUST
Prospectus Date	rr_ProspectusDate	Jul. 27, 2018
Laudus Mondrian International Government Fixed Income Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Laudus® Mondrian International Government Fixed Income Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks long-term total return consistent with its value-oriented investment approach.
Expense [Heading]	rr_ExpenseHeading	Fund Fees and Expenses
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses 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 % of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	July 30, 2020
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 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 the 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 52% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	52.00%
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	The information in the table has been restated to reflect current fees and expenses.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example by Year [Heading]	rr_ExpenseExampleByYearHeading	Expenses on a $10,000 Investment
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 time 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 one-year figure is based on total annual fund operating expenses after expense reduction. The expenses would be the same whether you stayed in the fund or sold your shares at the end of each period. Your actual costs may be higher or lower.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The fund invests primarily in fixed income securities that may also provide the potential for capital appreciation. The fund is an international fund that invests primarily in issuers that are organized, have a majority of their assets or derive most of their operating income outside of the United States. As such, it may invest primarily in securities issued in any currency and may hold foreign currency. Under normal circumstances, the fund intends to invest in securities which are denominated in foreign currencies. Securities of issuers within a given country may be denominated in the currency of such country, in the currency of another country or in multinational currency units, such as the euro. The fund will attempt to achieve its objective by investing in a broad range of fixed income securities, including debt obligations of governments, their agencies, instrumentalities or political subdivisions and companies. They will generally be rated, at the time of investment, BBB or better by S&P or Moody’s or, if unrated, are deemed to be of comparable quality by the subadviser. The fund may invest up to 5% of its assets (determined at time of purchase) in fixed-income securities rated below investment grade (sometimes called junk bonds), including government securities as discussed below. The fund may invest up to 20% of its net assets (determined at time of purchase) in corporate debt securities. The fund may invest up to 5% of its assets (determined at time of purchase) in emerging markets. The fund is considered “non-diversified”, which means that it may invest in the securities of relatively few issuers. Under normal circumstances, the fund will invest at least 80% of its net assets (including, for this purpose, any borrowings for investment purposes) in fixed income securities issued by governments, government agencies or instrumentalities including government-sponsored entities and supra-national entities. The fund will notify its shareholders at least 60 days before changing this policy. The subadviser’s approach in selecting investments for the fund is oriented to country selection and is value driven. In selecting fixed income instruments for the fund, the subadviser identifies those countries’ fixed income markets that it believes will provide the United States domiciled investor the highest yield over a market cycle while also offering the opportunity for capital gain and currency appreciation. The subadviser conducts extensive fundamental research on a global basis, and it is through this effort that attractive fixed income markets are selected for investment. The core of the fundamental research effort is a value-oriented prospective real yield approach which looks at today’s yield in each market and subtracts from it forecasted inflation for the next two years to identify value as a forward looking potential real yield. Comparisons of the values of different possible investments are then made. The higher the prospective real yield the higher the relative allocation and conversely the lower the prospective real yield the lower the allocation or even a zero allocation. The fund may also invest in zero coupon bonds, and in the debt securities of supranational entities denominated in any currency. The fund also may invest in securities issued by the U.S. Government or its agencies and instrumentalities such as Government National Mortgage Association (Ginnie Mae), Federal National Mortgage Association (Fannie Mae) and Federal Home Loan Mortgage Corporation (Freddie Mac). The fund may actively carry on hedging activities, and may utilize a wide range of derivative instruments, including options, futures contracts and related options, and forward foreign currency exchange contracts to hedge currency risks associated with its portfolio securities. This hedging may be in the form of cross hedging. Hedging and cross hedging may be used to identify value opportunities in the currency markets. The fund may also use derivatives as a substitute for taking a position in the underlying asset. The fund may lend its securities to certain financial institutions to earn additional income. The fund may buy and sell portfolio securities actively. As a result, the fund’s portfolio turnover rate and transaction costs will rise, which may lower fund performance and may increase the likelihood of capital gain distributions. For temporary defensive purposes, during unusual economic or market conditions or for liquidity purposes, the fund may invest up to 100% of its assets in cash, money market instruments, repurchase agreements and other short-term obligations. When the fund engages in such activities, it may not achieve its investment objective.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The fund is subject to risks, any of which could cause an investor to lose money. The fund’s principal risks include: Market Risk. Financial markets rise and fall in response to a variety of factors, sometimes rapidly and unpredictably. As with any investment whose performance is tied to these markets, the value of an investment in the fund will fluctuate, which means that an investor could lose money over short or long periods. Management Risk. As with all actively managed funds, the fund is subject to the risk that its subadviser will select investments or allocate assets in a manner that could cause the fund to underperform or otherwise not meet its objective. Poor bond selection or a focus on securities in a particular region may cause the fund to underperform its benchmark or other funds with a similar investment objective. Non-Diversification Risk. The fund is non-diversified and, as such, may invest a greater percentage of its assets in the securities of a single issuer than a fund that is diversified. A non-diversified fund is more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund. Interest Rate Risk. The fund’s investments in fixed-income securities are subject to the risk that interest rates rise and fall over time. As with any investment whose yield reflects current interest rates, the fund’s yield will change over time. During periods when interest rates are low, the fund’s yield (and total return) also may be low. Changes in interest rates also may affect the fund’s share price: a rise in interest rates could cause the fund’s share price to fall. The longer the fund’s portfolio duration, the more sensitive to interest rate movements its share price is likely to be. A change in a central bank’s monetary policy or improving economic conditions, among other things, may result in an increase in interest rates. Credit Risk. The fund is subject to the risk that a decline in the credit quality of a portfolio investment could cause the fund’s share price to fall. The fund could lose money if the issuer of a portfolio investment fails to make timely principal or interest payments or if a guarantor or counterparty of a portfolio investment fails to honor its obligations. Securities rated below investment grade (junk bonds) involve greater risk of price declines than investment grade securities due to actual or perceived changes in the issuer’s creditworthiness. Prepayment and Extension Risk. The fund’s investments are subject to the risk that the securities may be paid off earlier or later than expected. Either situation could cause the fund to hold securities paying lower-than-market rates of interest, which could hurt the fund’s yield or share price. Foreign Investment Risk. The fund’s investments in securities of foreign issuers involve certain risks that may be greater than those associated with investments in securities of U.S. issuers. These include risks of adverse changes in foreign economic, political, regulatory and other conditions; changes in currency exchange rates or exchange control regulations (including limitations on currency movements and exchanges); the imposition of economic sanctions or other government restrictions; differing accounting, auditing, financial reporting and legal standards and practices; differing securities market structures; and higher transaction costs. These risks may negatively impact the value or liquidity of the fund’s investments, and could impair the fund’s ability to meet its investment objective or invest in accordance with its investment strategy. There is a risk that investments in securities denominated in, and/or receiving revenues in, foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged, resulting in the dollar value of the fund’s investment being adversely affected. Foreign securities also include ADRs, GDRs and EDRs which may be less liquid than the underlying shares in their primary trading market and GDRs, many of which are issued by companies in emerging markets, may be more volatile. Emerging Markets Risk. Emerging market countries may be more likely to experience political turmoil or rapid changes in market or economic conditions than more developed countries. Emerging market countries often have less uniformity in accounting and reporting requirements and greater risk associated with the custody of securities. In addition, the financial stability of issuers (including governments) in emerging market countries may be more precarious than in developed countries. As a result, there may be an increased risk of illiquidity and price volatility associated with the fund’s investments in emerging market countries, which may be magnified by currency fluctuations relative to the U.S. dollar, and, at times, it may be difficult to value such investments. Derivatives Risk. The fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The fund’s use of derivatives could reduce the fund’s performance, increase the fund’s volatility, and could cause the fund to lose more than the initial amount invested. In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the fund. Leverage Risk. Certain fund transactions, such as derivatives transactions, may give rise to a form of leverage and may expose the fund to greater risk. Leverage tends to magnify the effect of any increase or decrease in the value of the fund’s portfolio securities, which means even a small amount of leverage can have a disproportionately large impact on the fund. Liquidity Risk. The fund may be unable to sell certain securities, such as illiquid securities, readily at a favorable time or price, or the fund may have to sell them at a loss. Securities Lending Risk. Securities lending involves the risk of loss of rights in, or delay in recovery of, the loaned securities if the borrower fails to return the security loaned or becomes insolvent. For more information on the risks of investing in the fund, please see the “Fund Details” section in the prospectus.
Risk Lose Money [Text]	rr_RiskLoseMoney	The fund is subject to risks, any of which could cause an investor to lose money.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-Diversification Risk. The fund is non-diversified and, as such, may invest a greater percentage of its assets in the securities of a single issuer than a fund that is diversified. A non-diversified fund is more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart below shows how the fund’s investment results have varied from year to year, and the following table shows how the fund’s average annual total returns for various periods compared to that of an index. This information provides some indication of the risks of investing in the fund. All figures assume distributions were reinvested. Keep in mind that future performance (both before and after taxes) may differ from past performance. For current performance information, please see www.schwabfunds.com/laudusfunds_prospectus. On July 27, 2009, the Investor Share class, Select Share class and Institutional Share class were combined into a single class of shares of the fund, and the fund no longer offers multiple classes of shares. The performance history of the fund is that of the fund’s former Institutional Shares. Accordingly, the past performance information of the fund’s former Institutional Shares is shown below.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart below shows how the fund’s investment results have varied from year to year, and the following table shows how the fund’s average annual total returns for various periods compared to that of an index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.schwabfunds.com/laudusfunds_prospectus
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Keep in mind that future performance (both before and after taxes) may differ from past performance.
Bar Chart [Heading]	rr_BarChartHeading	Annual Total Returns (%) as of 12/31
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter: 11.42% Q1 2008 Worst Quarter: (11.17%) Q4 2016 Year-to-date performance (non-annualized and before taxes) as of 6/30/2018: 0.10%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns as of 12/31/17
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax figures reflect the highest individual federal income tax rates in effect during the period and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Your actual after-tax returns depend on your individual tax situation. In addition, after-tax returns are not relevant if you hold your fund shares through a tax-deferred arrangement, such as a 401(k) plan, IRA or other tax-advantaged account.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	In some cases, the return after taxes on distributions and sale of shares may exceed the fund’s other returns due to an assumed benefit from any losses on a sale of shares at the end of the measurement period.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The after-tax figures reflect the highest individual federal income tax rates in effect during the period and do not reflect the impact of state and local taxes. Your actual after-tax returns depend on your individual tax situation. In addition, after-tax returns are not relevant if you hold your fund shares through a tax-deferred arrangement, such as a 401(k) plan, IRA or other tax-advantaged account. In some cases, the return after taxes on distributions and sale of shares may exceed the fund’s other returns due to an assumed benefit from any losses on a sale of shares at the end of the measurement period.
Laudus Mondrian International Government Fixed Income Fund | Laudus Mondrian International Government Fixed Income Fund
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees (fees paid directly from your investment)	rr_ShareholderFeeOther	none
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.22%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.82%
Less expense reduction	rr_FeeWaiverOrReimbursementOverAssets	(0.07%)
Total annual fund operating expenses after expense reduction	rr_NetExpensesOverAssets	0.75%	[1]
1 Year	rr_ExpenseExampleYear01	$ 77
3 Years	rr_ExpenseExampleYear03	247
5 Years	rr_ExpenseExampleYear05	441
10 Years	rr_ExpenseExampleYear10	$ 1,000
2008	rr_AnnualReturn2008	10.83%
2009	rr_AnnualReturn2009	7.62%
2010	rr_AnnualReturn2010	6.54%
2011	rr_AnnualReturn2011	3.21%
2012	rr_AnnualReturn2012	1.86%
2013	rr_AnnualReturn2013	(7.56%)
2014	rr_AnnualReturn2014	(3.41%)
2015	rr_AnnualReturn2015	(5.49%)
2016	rr_AnnualReturn2016	0.05%
2017	rr_AnnualReturn2017	10.51%
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-date performance (non-annualized and before taxes)
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	0.10%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2008
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	11.42%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2016
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(11.17%)
Label	rr_AverageAnnualReturnLabel	Before Taxes
1 Year	rr_AverageAnnualReturnYear01	10.51%
5 Years	rr_AverageAnnualReturnYear05	(1.38%)
10 Years	rr_AverageAnnualReturnYear10	2.23%
Laudus Mondrian International Government Fixed Income Fund | After Taxes on Distributions | Laudus Mondrian International Government Fixed Income Fund
Risk/Return:	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	After Taxes on Distributions
1 Year	rr_AverageAnnualReturnYear01	10.51%
5 Years	rr_AverageAnnualReturnYear05	(1.74%)
10 Years	rr_AverageAnnualReturnYear10	1.50%
Laudus Mondrian International Government Fixed Income Fund | After Taxes on Distributions and Sale of Shares | Laudus Mondrian International Government Fixed Income Fund
Risk/Return:	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	After Taxes on Distributions and Sale of Shares
1 Year	rr_AverageAnnualReturnYear01	5.95%
5 Years	rr_AverageAnnualReturnYear05	(1.06%)
10 Years	rr_AverageAnnualReturnYear10	1.55%
Laudus Mondrian International Government Fixed Income Fund | Comparative Index (reflects no deduction for expenses or taxes) FTSE Non-U.S. Dollar World Government Bond Index
Risk/Return:	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Comparative Index (reflects no deduction for expenses or taxes) FTSE Non-U.S. Dollar World Government Bond Index
1 Year	rr_AverageAnnualReturnYear01	10.33%	[2]
5 Years	rr_AverageAnnualReturnYear05	(0.29%)	[2]
10 Years	rr_AverageAnnualReturnYear10	2.44%	[2]

[1] The investment adviser has contractually agreed to limit the total annual fund operating expenses (excluding interest, taxes and certain non-routine expenses) of the fund to 0.75% until at least July 30, 2020. During this term, the agreement may only be amended or terminated with the approval of the fund’s Board of Trustees. Any amounts waived or reimbursed in a particular fiscal year will be subject to reimbursement by the fund to the investment adviser during the next two fiscal years to the extent that the repayment will not cause the fund’s total annual fund operating expenses to exceed the limit (as stated in the agreement) during the respective year or the current year. The investment adviser may, but is not required to, extend the agreement for additional years. The information in the table has been restated to reflect current fees and expenses.

[2] Formerly the Citigroup Non-U.S. Dollar World Government Bond Index.