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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName WASATCH FUNDS TRUST
Prospectus Date rr_ProspectusDate Jun. 04, 2014
Wasatch Large Cap Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading WASATCH LARGE CAP VALUE FUND — Summary
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVES
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund’s investment objectives are to seek capital appreciation and income.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The tables below describe the fees and expenses that you may pay if you buy, sell or hold Investor Class 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 January 31, 2016
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). 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 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 47% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 47.00%
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 Investor Class of the Fund with the cost of investing in other mutual funds. The example assumes that you invested $10,000 in the Investor Class of the Fund for the time periods indicated and then redeemed all of your shares at the end of those periods. The example also assumes that your investment had a 5% return each year and that the operating expenses (as a percentage of net assets) of the Fund’s Investor Class remained the same. The example reflects contractual fee waivers and reimbursements through January 31, 2016. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund invests primarily in equity securities.
Under normal market conditions, we will invest at least 80% of the Fund’s net assets (plus borrowings for investment purposes) in equity securities of companies with market capitalizations of over $5 billion at the time of purchase. Equity securities include common stock, preferred stock and securities convertible into common stock, warrants and rights, and other securities with equity characteristics (for example, participatory notes or derivatives linked to a basket of underlying equity securities, certain options on common stock, and exchange traded funds).
To achieve the Fund’s investment objectives, the Fund typically invests in the securities of companies that we believe will pay above average dividends or interest, but which remain appropriately valued based on our valuation analysis.
When evaluating a potential investment for the Fund, we employ a comprehensive valuation analysis intended to establish a range for fair valuation or intrinsic company value, with a particular emphasis on company fundamentals. The initial valuation review may include:
  • Calculating and reviewing standard ratios, such as price-to-sales, price-to-book, price-to-earnings, and price/earnings-to-growth.
  • Modified discounted cash flow models with sensitivity analysis for changes to revenue growth rates, operating margins, outstanding share counts, earnings multiples, and tangible book value.
  • Changing sector and company specific outlooks due to subjective factors, including globalization of capital, labor and process knowledge, as well as increasing information and price transparency.
The Fund may invest a large percentage of its assets in a few sectors, including energy, financials, information technology, consumer discretionary, consumer staples, health care and industrials.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock All investments carry some degree of risk that will affect the value of the Fund, its investment performance and the price of its shares. As a result, you may lose money if you invest in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
The Fund is subject to the following principal investment risks:
Stock Market Risk. The Fund’s investments may decline in value due to movements in the overall stock market.
Stock Selection Risk. The Fund’s investments may decline in value even when the overall stock market is not in a general decline.
Value Investing Risk. A value investing strategy attempts to identify strong companies with stocks which are selling at a discount from their perceived true worth. It is subject to the risk that the stocks’ intrinsic values may never be fully recognized or realized by the market, their prices may go down, or that stocks judged to be undervalued may actually be appropriately priced.
Sector Weightings Risk. To the extent the Fund emphasizes, from time to time, investments in a particular sector, the Fund will be subject to a greater degree to the risks particular to that sector, including the sectors described below. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect all the securities in a single sector. If the Fund invests in a few sectors, it may have increased exposure to the price movements of those sectors.
Consumer Staples Sector Risk. The consumer staples sector may be affected by marketing campaigns, changes in consumer demands, government regulations and changes in commodity prices.
Consumer Discretionary Sector Risk. Industries in the consumer discretionary sector, such as consumer durables, hotels, restaurants, media, retailing and automobiles, may be significantly impacted by the performance of the overall economy, interest rates, competition, consumer confidence and spending, and changes in demographics and consumer tastes.
Energy Sector Risk. The value of energy companies is particularly vulnerable to developments in the energy sector, fluctuations in price and supply of energy fuels, energy conservation, supply of and demand for specific energy-related products or services, and tax policy and other government regulation.
Financials Sector Risk. The financials sector is subject to extensive government regulation, can be subject to relatively rapid change due to increasingly blurred distinctions between service segments, and can be significantly affected by the availability and cost of capital funds, changes in interest rates, the rate of corporate and consumer debt defaults, and price competition.
Health Care Sector Risk. Health care companies are strongly affected by worldwide scientific or technological developments. Their products may rapidly become obsolete. Many health care companies are also subject to significant government regulation and may be affected by changes in government policies.
Industrials Sector Risk. Industries in the industrials sector, such as companies engaged in the production, distribution or service of products or equipment for manufacturing, agriculture, forestry, mining and construction, can be significantly affected by general economic trends, including such factors as employment and economic growth, interest rate changes, changes in consumer spending, legislative and government regulation and spending, import controls, commodity prices, and worldwide competition.
Information Technology Sector Risk. Stocks of information technology companies may be volatile because issuers are sensitive to rapid obsolescence of existing technology, short product cycles, falling prices and profits, competition from new market entrants, and general economic conditions. Information technology stocks, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market.
Risk Lose Money [Text] rr_RiskLoseMoney All investments carry some degree of risk that will affect the value of the Fund, its investment performance and the price of its shares. As a result, you may lose money if you invest in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading HISTORICAL PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The Fund commenced operations on December 15, 2008 upon the reorganization of the 1st Source Monogram Income Equity Fund, the Fund’s predecessor fund (the “Predecessor Fund”), into the Fund. With the reorganization, the Fund assumed the financial and performance history of the Predecessor Fund. The following tables provide an indication of the historical risk of an investment in the Fund (and Predecessor Fund for periods prior to December 15, 2008). The bar chart below is intended to provide you with an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, as represented by the Investor Class of the Fund. The table below is designed to help you evaluate your risk tolerance by showing the best and worst quarterly performance for the years shown in the bar chart. The average annual total returns table allows you to compare the Fund’s (and Predecessor Fund’s for periods prior to December 15, 2008) performance over the time periods indicated to that of a broad-based market index. Past performance, before and after taxes, is not necessarily an indication of how the Investor Class of the Fund will perform in the future. In addition, the Predecessor Fund was advised by a different investment advisor and subject to different expenses, which may have produced different investment results. Performance information is updated regularly and is available on the Fund’s website www.WasatchFunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following tables provide an indication of the historical risk of an investment in the Fund (and Predecessor Fund for periods prior to December 15, 2008). The bar chart below is intended to provide you with an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, as represented by the Investor Class of the Fund. The table below is designed to help you evaluate your risk tolerance by showing the best and worst quarterly performance for the years shown in the bar chart. The average annual total returns table allows you to compare the Fund’s (and Predecessor Fund’s for periods prior to December 15, 2008) performance over the time periods indicated to that of a broad-based market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.WasatchFunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance, before and after taxes, is not necessarily an indication of how the Investor Class of the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading WASATCH LARGE CAP VALUE FUND — INVESTOR CLASS
Year by Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Year-to-date return as of March 31, 2014:    1.29%

Best and Worst Quarterly Returns
Best — 6/30/09      14.66%   
Worst — 12/31/08      -19.38%   
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns — (as of 12/31/13)
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 The after-tax returns are not relevant to investors who hold Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
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 the investor’s tax situation and may differ from those shown. The after-tax returns are not relevant to investors who hold Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Wasatch Large Cap Value Fund | Investor Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee (as a % of amount redeemed on shares held 60 days or less) rr_RedemptionFeeOverRedemption 2.00%
Exchange Fee rr_ExchangeFeeOverRedemption none
Maximum Account Fee rr_MaximumAccountFeeOverAssets none
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution/Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.26%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.16% [1]
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.06%)
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.10%
1 Year rr_ExpenseExampleYear01 $ 112
3 Years rr_ExpenseExampleYear03 357
5 Years rr_ExpenseExampleYear05 628
10 Years rr_ExpenseExampleYear10 $ 1,399
2004 rr_AnnualReturn2004 17.01%
2005 rr_AnnualReturn2005 9.94%
2006 rr_AnnualReturn2006 20.02%
2007 rr_AnnualReturn2007 12.36%
2008 rr_AnnualReturn2008 (31.14%)
2009 rr_AnnualReturn2009 24.37%
2010 rr_AnnualReturn2010 11.11%
2011 rr_AnnualReturn2011 (3.92%)
2012 rr_AnnualReturn2012 10.55%
2013 rr_AnnualReturn2013 25.78%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2014
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.29%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.66%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.38%)
1 Year rr_AverageAnnualReturnYear01 25.78%
5 Years rr_AverageAnnualReturnYear05 13.05%
10 Years rr_AverageAnnualReturnYear10 8.23%
Wasatch Large Cap Value Fund | Return after taxes on distributions | Investor Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.35%
5 Years rr_AverageAnnualReturnYear05 11.01%
10 Years rr_AverageAnnualReturnYear10 6.54%
Wasatch Large Cap Value Fund | Return after taxes on distributions and sale of Fund shares | Investor Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.30%
5 Years rr_AverageAnnualReturnYear05 10.43%
10 Years rr_AverageAnnualReturnYear10 6.58%
Wasatch Large Cap Value Fund | Russell 1000® Value Index (reflects no deductions for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 32.53%
5 Years rr_AverageAnnualReturnYear05 16.67%
10 Years rr_AverageAnnualReturnYear10 7.58%
[1] The Advisor has contractually agreed to reimburse the Investor Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 1.10% of average daily net assets until at least January 31, 2016 (excluding interest, dividend expense on short sales/interest expense, taxes, brokerage commissions, other investment related costs and extraordinary expenses). The Board of Trustees is the only party that can terminate the contractual limitation prior to the contract's expiration. The Advisor can rescind the contractual limitation on expenses at any time after its expiration date.