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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName WASATCH FUNDS TRUST
Prospectus Date rr_ProspectusDate Aug. 29, 2013
Wasatch Small Cap Growth Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading WASATCH SMALL CAP GROWTH FUND — Summary
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
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 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, 2015
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 20% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.00%
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, which 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 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, 2015. 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 small growth companies.
Under normal market conditions, we will invest at least 80% of the Fund’s net assets in the equity securities of small-capitalization companies. The Fund considers a company to be a small-capitalization company if its market capitalization, at the time of purchase, is less than the larger of $3 billion or the market capitalization of the largest company in the Russell 2000 Index as of its most recent reconstitution date.
The Fund may invest up to 20% of its total assets at the time of purchase in securities issued by foreign companies in developed or emerging markets. Securities issued by companies incorporated outside the United States whose securities are publicly traded in the United States are not defined as foreign companies and are not subject to this limitation.
Within the Fund’s portfolio, we seek to create a blend of “core” companies that we believe have the potential to grow steadily over long periods of time at faster rates than average large companies, and “high growth” companies that we believe have the potential to grow faster and more aggressively than core companies. The secondary objective of income is achieved when fast growing portfolio companies pay dividends, generated by cash flow, typically after achieving growth targets.
We use a “bottom up” process of fundamental analysis to look for individual companies that we believe have superior growth prospects. Our analysis may include studying a company’s financial statements, building proprietary financial models, visiting company facilities, and meeting with executive management, suppliers and customers.
The Fund may invest a large percentage of its assets in a few sectors, including information technology, industrials, consumer discretionary, health care, energy and financials.
The Fund may invest in initial public offerings (IPOs).
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.
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 invests primarily in equity securities (including common stock, preferred stock and securities convertible into common stock, warrants and rights, and other securities with equity characteristics). The Fund’s investments may decline in value even when the overall stock market is not in a general decline.
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 investment in U.S. securities due to differences in the economic and political environment, the amount of available public information, the degree of market regulation, and financial reporting, accounting and auditing standards, and, in the case of foreign currency-denominated securities, fluctuations in currency exchange rates.
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 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.
Small Company Stock Risk. Small cap stocks may be very sensitive to changing economic conditions and market downturns because the issuers often have narrow markets, fewer product lines, and limited managerial and financial resources, resulting in volatile stock prices and a limited ability to sell them at a desirable time or price.
Growth Stock Risk. Growth stock prices may be more sensitive to changes in current or expected earnings than the prices of other stocks, and they may fall or not appreciate in step with the broader securities markets.
Sector Weightings Risk. 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.
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.
Consumer discretionary sector risk. To the extent the Fund emphasizes, from time to time, investments in a market segment, the Fund will be subject to a greater degree to the risks particular to that segment, and may experience greater market fluctuation, than a fund without the same focus. Industries in the consumer discretionary segment, 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. To the extent the Fund emphasizes, from time to time, investments in a market segment, the Fund will be subject to a greater degree to the risks particular to that segment, and may experience greater market fluctuation, than a fund without the same focus. 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. To the extent the Fund emphasizes, from time to time, investments in a market segment, the Fund will be subject to a greater degree to the risks particular to that segment, and may experience greater market fluctuation, than a fund without the same focus. Industries in the financial segment, such as banks, insurance companies, broker-dealers and real estate investment trusts, may be sensitive to changes in interest rates and general economic activity and are generally subject to extensive government regulation.
Health Care Stock Risk. To the extent the Fund emphasizes, from time to time, investments in a market segment, the Fund will be subject to a greater degree to the risks particular to that segment, and may experience greater market fluctuation, than a fund without the same focus. 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. To the extent the Fund emphasizes, from time to time, investments in a market segment, the Fund will be subject to a greater degree to the risks particular to that segment, and may experience greater market fluctuation, than a fund without the same focus. Industries in the industrial segment, 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 Risk. To the extent the Fund emphasizes, from time to time, investments in a market segment, the Fund will be subject to a greater degree to the risks particular to that segment, and may experience greater market fluctuation, than a fund without the same focus. 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading HISTORICAL PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following tables provide information on how the Investor Class of the Fund has performed over time. The past performance, before and after taxes, of the Fund’s Investor Class is not necessarily an indication of how these shares will perform in the future. 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 of the Fund’s Investor Class for the years shown in the bar chart. The average annual total return table below allows you to compare the Fund’s performance over the time periods indicated to that of a broad-based market index and an additional index composed of securities similar to those held by the Fund. 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 information on how the Investor Class of the Fund has performed over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.WasatchFunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The past performance, before and after taxes, of the Fund’s Investor Class is not necessarily an indication of how these shares will perform in the future.
Bar Chart [Heading] rr_BarChartHeading WASATCH SMALL CAP GROWTH FUND — INVESTOR CLASS
Year by Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best and Worst Quarterly Returns
Best — 6/30/03                         25.79%
Worst — 12/31/08                         -22.04%
Year-to-date return through 6/30/13 was 13.39%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns — (as of 12/31/12)
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 Small Cap 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%
Distribution/Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.26% [1]
1 Year rr_ExpenseExampleYear01 $ 128
3 Years rr_ExpenseExampleYear03 399
5 Years rr_ExpenseExampleYear05 691
10 Years rr_ExpenseExampleYear10 $ 1,522
2003 rr_AnnualReturn2003 37.43%
2004 rr_AnnualReturn2004 13.36%
2005 rr_AnnualReturn2005 5.14%
2006 rr_AnnualReturn2006 8.40%
2007 rr_AnnualReturn2007 8.36%
2008 rr_AnnualReturn2008 (41.66%)
2009 rr_AnnualReturn2009 48.74%
2010 rr_AnnualReturn2010 28.92%
2011 rr_AnnualReturn2011 (0.06%)
2012 rr_AnnualReturn2012 16.95%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 13.39%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2003
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.79%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.04%)
1 Year rr_AverageAnnualReturnYear01 16.95%
5 Years rr_AverageAnnualReturnYear05 5.51%
10 Years rr_AverageAnnualReturnYear10 9.66%
Wasatch Small Cap Growth Fund | Return after taxes on distributions | Investor Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.79%
5 Years rr_AverageAnnualReturnYear05 5.16%
10 Years rr_AverageAnnualReturnYear10 8.93%
Wasatch Small Cap Growth Fund | Return after taxes on distributions and sale of Fund shares | Investor Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.54%
5 Years rr_AverageAnnualReturnYear05 4.73%
10 Years rr_AverageAnnualReturnYear10 8.46%
Wasatch Small Cap Growth Fund | Russell 2000® Growth Index (reflects no deductions for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.59%
5 Years rr_AverageAnnualReturnYear05 3.49%
10 Years rr_AverageAnnualReturnYear10 9.80%
Wasatch Small Cap Growth Fund | Russell 2000® Index (reflects no deductions for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.35%
5 Years rr_AverageAnnualReturnYear05 3.56%
10 Years rr_AverageAnnualReturnYear10 9.72%
[1] The Advisor has contractually agreed to reimburse the Investor Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 1.50% until at least January 31, 2015 (excluding interest, dividend expense on short sales/interest expense, taxes, brokerage commissions, other investment related costs and extraordinary expenses). Acquired Fund Fees and Expenses are not included in the expense limitation. The Board of Trustees is the only party that may terminate the contractual limitation prior to the contract's expiration. The Advisor may rescind the contractual limitation on expenses at any time after its expiration date. There were no reimbursements for the Investor Class shares of the Fund during 2012. The Total Annual Fund Operating Expenses may not equal the expense ratio stated in the Fund's most recent Annual Report and Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.