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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName WASATCH FUNDS TRUST
Prospectus Date rr_ProspectusDate Jan. 31, 2020
Wasatch Ultra Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading WASATCH ULTRA GROWTH FUND® — SUMMARY
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVES
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund’s primary investment objective is long-term growth of capital.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock Income is a secondary objective, but only when consistent with long-term growth of capital. Currently, we do not expect the Fund’s investments to generate substantial 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 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, 2021
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 17% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 17.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Institutional Class shares were newly offered on January 31, 2020. Accordingly, Other Expenses for such class are estimated for the current fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses may not equal the expense ratio stated in the Fund’s most recent Annual Report and Financial Highlights. The expense ratio reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
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 Fund with the cost of investing in other mutual funds. The example assumes that you invested $10,000 in the applicable 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 operating expenses (as a percentage of net assets) of the Fund remained the same. This example reflects contractual fee waivers and reimbursements through January 31, 2021. 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 smaller high growth companies.

Under normal market conditions, we will invest the Fund’s assets in the equity securities of companies we consider to be rapidly growing. These companies are usually small to mid-size with market capitalizations of less than $5 billion at the time of purchase.

The Fund may invest up to 30% of its total assets at the time of purchase in securities issued by foreign companies in developed markets, emerging markets, or frontier markets. Securities issued by companies incorporated outside the United States whose securities are principally traded in the United States are not defined as foreign companies and are not subject to this limitation.

We use a process of “bottom-up” fundamental analysis to look for individual companies that we believe have above average potential for rapid earnings growth and stock price appreciation. Our analysis may include studying a company’s financial statements, visiting company facilities, and meeting with executive management, suppliers and customers.

The Fund may invest a large percentage of its assets in a particular region or market, including Europe and the United Kingdom.

The Fund may invest a large percentage of its assets in a few sectors, including health care, information technology, industrials, consumer discretionary, and financials. 

The Fund may invest in initial public offerings (IPOs).
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund may invest a large percentage of its assets in a few sectors, including health care, information technology, industrials, consumer discretionary, and financials.
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 investment techniques and risk analysis employed by the Advisor may not produce the desired results. This could cause the Fund to lose value even when the overall stock market is not in a general decline, or could cause the Fund’s investment results to lag its performance benchmark or other funds with similar benchmarks.

Equity Securities Risk. Equity securities represent ownership in a company. They may be traded (bought or sold) on a securities exchange or stock market. Stock markets are volatile. The price of equity securities will fluctuate and can decline and reduce the value of a portfolio investing in equity securities. The value of equity securities purchased by the Fund could decline if the financial condition of the companies in which the Fund invests declines or if overall market and economic conditions deteriorate. The value of equity securities may also decline due to factors that affect a particular industry or industries such as labor shortages, an increase in production costs and changes in competitive conditions within an industry. In addition, the value of equity securities may decline due to general market conditions not specifically related to a company or industry such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates, changes in government regulations, or generally adverse investor sentiment. Certain equity securities may be less liquid, meaning that they may be difficult to sell at a time or price that is desirable, than other types of securities, or they may be illiquid. Some securities exchanges or stock markets may also be less liquid or illiquid due to low trading volume.

Smaller Company Stock Risk. Small- and mid-cap stocks may be very sensitive to changing economic conditions and market downturns. In particular, the issuers of small company stocks have more narrow markets for their products and services, fewer product lines, and more limited managerial and financial resources than larger issuers. The stocks of small companies may therefore be more volatile and the ability to sell these stocks at a desirable time or price may be more limited.

Growth Stock Risk. Growth stock prices may be more sensitive to changes in companies’ current or expected earnings than the prices of other stocks, and growth stock prices may fall or may not appreciate in step with the broader securities markets.

Liquidity Risk. The trading market for a particular security or type of security in which the Fund invests may be significantly less liquid than developed or even emerging markets, and there may be little or no trading volume for a period of time for a particular security. Reduced liquidity will have an adverse impact on the Fund’s ability to sell such securities quickly at a desired price when necessary to meet the Fund’s liquidity needs or in response to a specific economic event. It may be difficult at times to sell such securities at any price, which could impact not only the daily net asset value (NAV) of the Fund, but also the composition of the portfolio if other securities must be sold to meet the Fund’s liquidity needs. Additionally, market quotations for such securities may be volatile affecting the daily NAV of the Fund.

Initial Public Offerings (IPOs) Risk. IPOs involve a higher degree of risk because companies involved in IPOs generally have limited operating histories and their prospects for future profitability are uncertain. Prices of IPOs may also be unstable due to the absence of a prior public market, the small number of shares available for trading and limited investor information.

Foreign Securities Risk. Foreign securities are generally more volatile and less liquid than U.S. securities. Further, foreign securities may be subject to additional risks not associated with investments in U.S. securities. Differences in the economic and political environment, the amount of available public information, the amount of taxation, limitations on the use or transfer of Fund assets, the degree of market regulation, settlement practices, the potential for permanent or temporary termination of trading, and financial reporting, accounting and auditing standards, and, in the case of foreign currency-denominated securities, fluctuations in currency exchange rates, can have a significant effect on the value of a foreign security. Additionally, certain countries may utilize formal or informal currency-exchange controls or “capital controls.” Capital controls may impose restrictions on the Fund’s ability to repatriate investments or income. Such capital controls can also have a significant effect on the value of the Fund’s holdings.

Europe and United Kingdom Risk. The value of the Fund’s assets may be adversely affected by, among other things, the social, political, regulatory, economic and other events or conditions affecting Europe and the United Kingdom (“U.K.”). Many countries in Europe are member states of the European Union (“EU”) and will be significantly affected by the fiscal and monetary controls of the EU. Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the Euro and recessions or defaults or threats of defaults among European countries may have a significant adverse effect on the economies of other European countries. The European financial markets have experienced significant volatility, and several European countries have been adversely affected by unemployment, budget deficits and economic downturns. In addition, one or more countries may abandon the Euro and/or withdraw from the EU creating continuing uncertainty in the currency and financial markets generally. In this regard, the U.K. has commenced the official withdrawal process from the EU commonly referred to as “Brexit.” The uncertainty of Brexit could have a significant impact on the business and financial results of companies in the U.K. and other European countries. For example, Brexit could cause market and currency volatility, economic uncertainty, labor disruptions, political instability and uncertainty, and regulatory uncertainty for companies operating in the U.K. but that rely on cross-border labor and trade. During this period of political, legal and commercial uncertainty, the negative impact on not only the U.K. and European economies, but the broader global economy, could be significant, especially if the U.K. leaves the EU without agreements on trade, finance and other key elements, often called a “hard Brexit.” These uncertainties could potentially result in increased market volatility and illiquidity and lower economic growth for companies that rely significantly on the U.K. or on Europe for their business activities and revenues.

Emerging Markets Risk. In addition to the risks of investing in foreign securities in general, the risks of investing in the securities of companies domiciled in emerging market countries include increased political or social instability, economies based on only a few industries, unstable currencies, runaway inflation, highly volatile and less liquid securities markets, unpredictable shifts in policies relating to foreign investments, lack of protection for investors against parties that fail to complete transactions, and the potential for government seizure of assets or nationalization of companies or other government interference in which case the Fund could lose all or a significant portion of its investment in that country.

Frontier Markets Risk. In addition to the risks of investing in foreign securities in developed and emerging markets, frontier market securities involve unique risks, such as exposure to economies less diverse and mature than those of the U.S. or more established foreign markets. Economic or political instability may cause larger price changes in frontier market securities than in securities of issuers based in more developed foreign countries, including securities of issuers in larger emerging markets. Frontier markets generally receive less investor attention than developed markets or larger emerging markets. These risks can result in the potential for extreme stock price volatility and illiquidity.

Sector and Industry 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 securities in those sectors. The Fund may also from time to time make significant investments in an industry or industries within a particular sector. The industries that constitute a sector may all react in the same way to economic, political or regulatory events. Adverse conditions in such industry or industries could have a correspondingly adverse effect on the financial condition of issuers. These conditions may cause the value of the Fund’s shares to fluctuate more than the values of shares of funds that invest in a greater variety of investments.

Consumer Discretionary Sector Risk. The consumer discretionary sector includes companies in industries such as consumer services, household durables, leisure products, textiles, apparel and luxury goods, hotels, restaurants, retailing, e-commerce, and automobiles. Companies in the consumer discretionary sector may be significantly impacted by the performance of the overall domestic and global economy and interest rates. The consumer discretionary sector relies heavily on disposable household income and spending. Companies in this sector may be subject to severe competition, which may have an adverse impact on their respective profitability. The retail industry can be significantly affected by changes in demographics and consumer tastes, which can also affect the demand for, and success of, consumer products and services in the marketplace. The automotive industry is highly cyclical and can be significantly affected by labor relations and fluctuating component prices.

Financials Sector Risk. The financials sector includes companies in the banks, diversified financials, and insurance industry groups. Companies in the financials sector are 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. Banking companies, including thrifts and mortgage finance and consumer finance companies, may be affected by extensive government regulation, which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds, and can fluctuate significantly when interest rates change. Credit losses resulting from financial difficulties of borrowers can negatively affect banking companies. Banking companies may also be subject to severe price competition. Competition is high among banking companies and failure to maintain or increase market share may result in lost market value. Capital markets, a sub-industry of diversified financials, may be affected by extensive government regulation as well as economic and other financial events that could cause fluctuations in the stock market, impacting the overall value of investments. The insurance industry may be affected by extensive government regulation and can be significantly affected by interest rates, general economic conditions, and price and marketing competition. Different segments of the insurance industry can be significantly affected by natural disasters, mortality and morbidity rates, and environmental clean-up.

Health Care Sector Risk. The health care sector includes companies in the health care equipment and services, and pharmaceuticals, biotechnology and life sciences industry groups. 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. Companies in the pharmaceuticals, biotechnology and life sciences industry group in particular are heavily dependent on patent protection, and the expiration of patents may adversely affect the profitability of such companies. These companies are also subject to extensive litigation based on product liability and other similar claims. Many new products are subject to government approval and the process of obtaining government approval can be long and costly, and even approved products are susceptible to obsolescence. These companies are also subject to competitive forces that may make it difficult to increase prices, or that may lead to price reductions.

Industrials Sector Risk. The industrials sector includes companies in the capital goods, commercial and professional services and transportation industry groups, including companies engaged in the business of human capital management, business research and consulting, air freight and logistics, airlines, maritime shipping and transportation, railroads and trucking, transportation infrastructure, and aerospace and defense. Companies in the industrials sector 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. Changes in the economy, fuel prices, labor agreements, and insurance costs may result in occasional sharp price movements in transportation securities. Aerospace and defense companies rely, to a significant extent, on government demand for their products and services. The financial condition of, and investor interest in, aerospace and defense companies are heavily influenced by government defense spending policies.

Information Technology Sector Risk. The information technology sector includes companies in the software and services, technology hardware and equipment, and semiconductors and semiconductor equipment industry groups. Companies in the information technology sector are subject to rapid obsolescence of existing technology, short product cycles, falling prices and profits, competition from new market entrants, and general economic conditions. Stocks of companies in the information technology sector, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Technological developments, fixed rate pricing, and the ability to retain skilled employees can significantly affect the industries in the information technology sector. Additionally, success in the internet services and infrastructure industry is subject to continued demand for internet services.
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 following tables provide information on how the Fund has performed over time. Performance in this section represents past performance (before and after taxes) which is not necessarily indicative of how the Fund will perform in the future. Performance for the Fund's Investor Class shares would be substantially similar to that for Institutional Class shares because the shares are invested in the same portfolio of securities and would differ only to the extent that Institutional Class shares have different expenses. The bar chart below is intended to provide you with an indication of the risks of investing in the Fund by showing 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 of the Fund's Investor Class for the calendar years shown in the bar chart. The average annual total returns table below allows you to compare the performance of the Fund over the time periods indicated to that of a broad-based market index. After-tax returns are shown for Investor Class only. After-tax returns for the Institutional Class will vary. However, as the Institutional Class was recently offered as of the date of this prospectus, no past performance for such class is available. Performance information is updated regularly and is available on the Fund's website wasatchglobal.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart below is intended to provide you with an indication of the risks of investing in the Fund by showing the Fund’s performance from year to year, as represented by the Investor Class of the Fund. The average annual total returns table below allows you to compare the performance of the Fund over the time periods indicated to that of a broad-based market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress wasatchglobal.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance in this section represents past performance (before and after taxes) which is not necessarily indicative of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading WASATCH ULTRA GROWTH FUND — INVESTOR CLASS Year by Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best and Worst Quarterly Returns
Best — 3/31/2019 18.90%
Worst — 12/31/2018 -18.08%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns — (as of 12/31/19)
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 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 One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Class only. After-tax returns for the Institutional Class will vary.
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. 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 Ultra Growth 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 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.24% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.25% [3]
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.25%
1 Year rr_ExpenseExampleYear01 $ 127
3 Years rr_ExpenseExampleYear03 397
5 Years rr_ExpenseExampleYear05 686
10 Years rr_ExpenseExampleYear10 $ 1,511
2010 rr_AnnualReturn2010 35.85%
2011 rr_AnnualReturn2011 (5.37%)
2012 rr_AnnualReturn2012 12.45%
2013 rr_AnnualReturn2013 35.67%
2014 rr_AnnualReturn2014 3.44%
2015 rr_AnnualReturn2015 2.85%
2016 rr_AnnualReturn2016 8.03%
2017 rr_AnnualReturn2017 31.56%
2018 rr_AnnualReturn2018 10.56%
2019 rr_AnnualReturn2019 38.06%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.90%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.08%)
1 Year rr_AverageAnnualReturnYear01 38.06%
5 Years rr_AverageAnnualReturnYear05 17.41%
10 Years rr_AverageAnnualReturnYear10 16.30%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 16, 1992
Wasatch Ultra Growth Fund | Institutional 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 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.09% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.10% [3]
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%)
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.06%
1 Year rr_ExpenseExampleYear01 $ 107
3 Years rr_ExpenseExampleYear03 343
5 Years rr_ExpenseExampleYear05 597
10 Years rr_ExpenseExampleYear10 $ 1,325
Wasatch Ultra Growth Fund | Return After Taxes on Distributions | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 37.41%
5 Years rr_AverageAnnualReturnYear05 15.11%
10 Years rr_AverageAnnualReturnYear10 13.90%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 16, 1992
Wasatch Ultra Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.97%
5 Years rr_AverageAnnualReturnYear05 13.28%
10 Years rr_AverageAnnualReturnYear10 12.90%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 16, 1992
Wasatch Ultra Growth Fund | Russell 2000® Growth Index (reflects no deductions for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 28.48% [4]
5 Years rr_AverageAnnualReturnYear05 9.34% [4]
10 Years rr_AverageAnnualReturnYear10 13.01% [4]
[1] Institutional Class shares were newly offered on January 31, 2020. Accordingly, Other Expenses for such class are estimated for the current fiscal year.
[2] The Total Annual Fund Operating Expenses may not equal the expense ratio stated in the Fund’s most recent Annual Report and Financial Highlights. The expense ratio reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
[3] Wasatch Advisors, Inc., doing business as Wasatch Global Investors (Advisor), the Fund’s investment advisor, has contractually agreed to reimburse the Investor Class and Institutional Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 1.50% and 1.05%, respectively, of average daily net assets until at least January 31, 2021 (excluding interest, dividend expense on short sales/interest expense, taxes, brokerage commissions, other investment related costs, acquired fund fees and expenses, and extraordinary expenses, such as litigation and other expenses not incurred in the ordinary course of business). The Fund may only make repayments to the Advisor for amounts reimbursed if such repayment does not cause the Fund’s expense ratio, after the repayment is taken into account, to exceed both (i) the expense cap in place at the time such amounts were waived; and (ii) the Fund’s current expense cap. 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. Shareholder expenses will increase if the Advisor does not renew the contractual expense cap after its expiration date.
[4] All rights in the Russell 2000® Growth Index vest in the relevant LSE Group company, which owns this index. Russell® is a trademark of the relevant LSE Group company and is used by any other LSE Group company under license. This index is calculated by or on behalf of FTSE International Limited or its affiliate, agent or partner. The LSE Group does not accept any liability whatsoever to any person arising out of (a) the use of, reliance on or any error in this index or (b) investment in or operation of the Fund or the suitability of this index for the purpose they are being used herein.