| Form N-CSR Cover | 6 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Laudus Trust |
| Entity Central Index Key | 0000832545 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Sep. 30, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | Laudus Trust | |
| Entity Central Index Key | 0000832545 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Sep. 30, 2024 | |
| Schwab Select Large Cap Growth Fund [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Schwab Select Large Cap Growth Fund | |
| Class Name | Schwab Select Large Cap Growth Fund | |
| Trading Symbol | LGILX | |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report 2024. | |
| Shareholder Report Annual or Semi-Annual | semi annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at www.schwabassetmanagement.com/prospectus . You can also request this information by calling 1-866-414-6349 or by sending an email request to orders mysummaryprospectus.com . | |
| Additional Information Phone Number | 1-866-414-6349 | |
| Additional Information Email | orders@mysummaryprospectus.com | |
| Additional Information Website | www.schwabassetmanagement.com/prospectus | |
| Expenses [Text Block] | FUND COSTS FOR THE LAST six months ENDED September 30, 2024 (BASED ON A HYPOTHETICAL $10,000 INVESTMENT) COSTS OF A $10,000 INVESTMENT COSTS PAID AS A PERCENTAGE OF A $10,000 INVESTMENT Schwab Select Large Cap Growth Fund $39 0.74% * * Annualized. | |
| Expenses Paid, Amount | $ 39 | |
| Expense Ratio, Percent | 0.74% | [1] |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. The performance data quoted represents past performance, and current returns may be lower or higher. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1,2 Fund and Inception Date 6 Months 1 Year 5 Years 10 Years Schwab Select Large Cap Growth Fund (10/10/1997)* 10.01% 42.78% 15.91% 14.58% S&P 500 ® Index 3 10.42% 36.35% 15.98% 13.38% Russell 1000 ® Growth Index 11.79% 42.19% 19.74% 16.52% All total returns on this page assume dividends and distributions were reinvested. Index figures do not include trading and management costs, which would lower performan ce. For index definitions, please see www.schwabassetmanagement.com/glossary. * Inception date is that of the fund’s predecessor fund, the Class Y Shares of the UBS U.S. Large Cap Growth Fund. 1 Fund expenses may have been partially absorbed by the investment adviser. Without these reductions, the fund’s returns would have been lower. These returns do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. 2 Prior to September 15, 2023, the fund had a different subadviser. The performance history of the fund prior to that date is attributable to the previous subadviser. 3 Due to new regulatory requirements, the fund’s regulatory index has changed from the Russell 1000 ® Growth Index to the S&P 500 ® Index. The S&P 500 ® Index provides a broad measure of market performance. The Russell 1000 ® Growth Index is the fund’s additional index and is more representative of the fund’s investment universe than t he regulatory index. | |
| Performance Inception Date | Oct. 10, 1997 | [2] |
| No Deduction of Taxes [Text Block] | These returns do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | To obtain performance information current to the most recent month end, visit www.schwabassetmanagement.com/prospectus . | |
| Net Assets | $ 2,259,000,000 | |
| Holdings Count | Holding | 108 | |
| Investment Company, Portfolio Turnover | 9% | |
| Additional Fund Statistics [Text Block] | Statistics Net Assets (millions) $2,259 Number of Holdings (excludes derivatives) 108 Portfolio Turnover Rate (not annualized) 9% Weighted Average Market Cap (millions) $1,414,992 Price/Earnings Ratio (P/E) 38.7 Price/Book Ratio (P/B) 10.3 | |
| Holdings [Text Block] | Sector Weightings % of Investments 1 Top Equity Holdings % of Net Assets Portfolio holdings may h ave c The Sector/Industry classifications in this report use the Global Industry Classification Standard (GICS) which was developed by and is the exclusive property of MSCI Inc. (MSCI) and Standard & Poor’s (S&P). GICS is a service mark of MSCI and S&P and has been licensed for use by Charles Schwab & Co., Inc. 1 Excludes derivatives. 2 Includes the fund’s position(s) in money market mutual funds registered under the Investment Company Act of 1940, as amended. | |
| Largest Holdings [Text Block] | Top Equity Holdings % of Net Assets Portfolio holdings may h ave c | |
| [1]Annualized.[2]Inception date is that of the fund’s predecessor fund, the Class Y Shares of the UBS U.S. Large Cap Growth Fund. | ||
| Shareholder Report, Average Annual Return (Details) | 6 Months Ended | 12 Months Ended | 60 Months Ended | 120 Months Ended | |
| Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | ||
| Schwab Select Large Cap Growth Fund [Member] | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Schwab Select Large Cap Growth Fund | ||||
| Average Annual Return, Percent | [1],[2] | 10.01% | 42.78% | 15.91% | 14.58% |
| Standard & Poor's 500 Index [Member] | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | [3] | S&P 500® Index | |||
| Average Annual Return, Percent | 10.42% | 36.35% | 15.98% | 13.38% | |
| Russell 1000 Growth Index [Member] | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Russell 1000® Growth Index | ||||
| Average Annual Return, Percent | 11.79% | 42.19% | 19.74% | 16.52% | |
| [1]Fund expenses may have been partially absorbed by the investment adviser. Without these reductions, the fund’s returns would have been lower. These returns do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.[2]Prior to September 15, 2023, the fund had a different subadviser. The performance history of the fund prior to that date is attributable to the previous subadviser.[3]Due to new regulatory requirements, the fund’s regulatory index has changed from the Russell 1000® Growth Index to the S&P 500® Index. The S&P 500® Index provides a broad measure of market performance. The Russell 1000® Growth Index is the fund’s additional index and is more representative of the fund’s investment universe than the regulatory index. | |||||
| Shareholder Report, Holdings (Details) - Schwab Select Large Cap Growth Fund [Member] | Sep. 30, 2024 | |
| NVIDIA Corp [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 11.10% | |
| Apple Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 9.20% | |
| Microsoft Crop [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 8.60% | |
| Amazon Com Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.10% | |
| Meta Platforms Inc Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.30% | |
| Alphabet Inc Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5% | |
| Eli Lilly And Co [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.70% | |
| Mastercard Inc Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.30% | |
| Netflix Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.50% | |
| Tesla Inc [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.30% | |
| Information Technology [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 43.60% | [1] |
| Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13.60% | [1] |
| Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13.40% | [1] |
| Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10% | [1] |
| Financials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.30% | [1] |
| Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 5.20% | [1] |
| Short Term Investment [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 3% | [1],[2] |
| Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.40% | [1] |
| Energy Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.90% | [1] |
| Materials Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [1] |
| [1]Excludes derivatives.[2]Includes the fund’s position(s) in money market mutual funds registered under the Investment Company Act of 1940, as amended. | ||
