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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName WASATCH FUNDS TRUST
Prospectus Date rr_ProspectusDate Jan. 31, 2016
Wasatch-Hoisington U.S. Treasury Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading WASATCH-HOISINGTON U.S. TREASURY FUND® — SUMMARY
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund’s investment objective is to provide a rate of return that exceeds the rate of inflation over a business cycle by investing in U.S. Treasury securities with an emphasis on both income and capital appreciation.
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, 2017
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 131% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 131.00%
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 operating expenses (as a percentage of net assets) of the Fund’s Investor Class remained the same. This example reflects contractual fee waivers and reimbursements through January 31, 2017. 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 In pursuit of the Fund’s investment objective, Hoisington Investment Management Company (HIMCO), the Fund’s Sub-Advisor, will:
  • Typically invest at least 90% of the Fund’s total assets in U.S. Treasury securities and in repurchase agreements collateralized by such securities.
  • Adjust the average maturity and effective duration of the Fund’s portfolio based on HIMCO’s assessment of multi-year trends in national and international economic conditions.
  • Invest in long-term U.S. Treasury bonds, including U.S. Treasury Strips (zero coupon Treasury securities), when HIMCO determines that economic conditions suggest lower inflation and the multi-year trend is toward decreasing interest rates.
  • Invest in U.S. Treasury bills or notes, TIPS, and FRNs (maturities less than five years) when HIMCO determines that economic conditions suggest rising inflation and the multi-year trend is toward increasing interest rates.
Over the course of a business cycle, under normal market conditions:
  • The effective duration of the Fund’s holdings is expected to vary from less than a year to a maximum of 25 years.
  • The Fund’s holdings will range in maturity from less than a year to a maximum of the longest maturity Treasury bonds available. As of September 30, 2015, the effective duration of the Fund’s holdings was 20.42 years, and the average maturity of the Fund’s holdings was 28.51 years.
  • When the Fund is invested in securities with longer weighted average maturities it will be more sensitive to changes in market interest rates and its share price may be subject to greater volatility.
  • The Fund’s portfolio turnover rate will vary substantially from year to year. During some periods, turnover will be well below 50%. At other times, turnover could exceed 200% annually. At these times, increased portfolio turnover may result in higher transaction costs and may also result in taxable capital gains.
  • Portfolio adjustments may require the sale of securities prior to their maturity date. The goal of these transactions will be to increase income and/or change the duration of the overall portfolio.
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:
Credit Risk. Credit risk is the risk that the issuer of a debt security will fail to repay principal and interest on the security when due. HIMCO seeks to limit credit risk by investing in U.S. Treasury securities backed by the full faith and credit of the U.S. government which are viewed as carrying minimal credit risk.
Interest Rate Risk. Interest rate risk is the risk that a debt security’s value will decline due to an increase in market interest rates. Even though U.S. Treasury securities offer a stable stream of income, their prices will still fluctuate with changes in interest rates. The Fund may be subject to greater risk of rising interest rates than would normally be the case due to the current period of historically low rates and the effect of potential government fiscal policy initiatives and resulting market reaction to those initiatives. When interest rates change, the values of longer duration debt securities usually change more than the values of shorter-duration debt securities.
Income Risk. Income risk is the potential for a decline in the Fund’s income due to falling interest rates.
Effective Duration. Effective duration is a measure of the responsiveness of a bond’s price to market interest rate changes. For example, if the interest rate increased 1%, a bond with an effective duration of five years would experience a decline in price of approximately 5%. Similarly, if the interest rate increased 1%, the price of a bond with an effective duration of 15 years would decline approximately 15%. The effective duration of the longest maturity U.S. zero coupon bond is 30 years. If the interest rate increased 1%, the value of the longest maturity zero coupon bond would decline approximately 30%. Similarly, if the interest rate decreased 1%, the value of the longest maturity zero coupon bond would increase approximately 30%.
Repurchase Agreements Risk. The main risk of a repurchase agreement is that the original seller might default on its obligation to repurchase the securities. If the seller defaults, the Fund will seek to recover its investment by selling the collateral and could encounter restrictions, costs or delays. The Fund will suffer a loss if it sells the collateral for less than the repurchase price.
Risks of Zero Coupon Treasury Securities. The market prices of zero coupon securities, which do not entitle the holder to periodic interest payments, are generally more volatile than the market prices of securities of comparable quality and similar maturity that do pay interest periodically. Zero coupon securities are more sensitive to fluctuations in interest rates than coupon securities of the same maturity.
Volatility Risk. Longer-term bonds are more sensitive to interest rate changes than shorter-term notes and bills. Prices of debt securities move inversely to interest rates. As a result, when the Fund is invested in longer-term securities, it may experience significant negative returns when long-term interest rates increase.
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 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 bond market index. 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 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 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 bond market index.
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-HOISINGTON U.S. TREASURY FUND — INVESTOR CLASS
Year by Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best and Worst Quarterly Returns
Best — 9/30/2011      36.15%   
Worst — 12/31/2010      -11.47%   
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns — (as of 12/31/15)
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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The Fund’s returns after taxes on distributions and sale of Fund shares may be higher than returns before taxes and after taxes on distributions because they include the effect of a tax benefit an investor may receive from the capital losses that would have been incurred.
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.

The Fund’s returns after taxes on distributions and sale of Fund shares may be higher than returns before taxes and after taxes on distributions because they include the effect of a tax benefit an investor may receive from the capital losses that would have been incurred.
Wasatch-Hoisington U.S. Treasury 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 0.50%
Distribution/Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.17%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.67% [1]
1 Year rr_ExpenseExampleYear01 $ 68
3 Years rr_ExpenseExampleYear03 214
5 Years rr_ExpenseExampleYear05 373
10 Years rr_ExpenseExampleYear10 $ 834
2006 rr_AnnualReturn2006 (0.18%)
2007 rr_AnnualReturn2007 10.00%
2008 rr_AnnualReturn2008 37.77%
2009 rr_AnnualReturn2009 (22.56%)
2010 rr_AnnualReturn2010 10.18%
2011 rr_AnnualReturn2011 41.23%
2012 rr_AnnualReturn2012 2.78%
2013 rr_AnnualReturn2013 (16.71%)
2014 rr_AnnualReturn2014 32.58%
2015 rr_AnnualReturn2015 (2.48%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 36.15%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.47%)
1 Year rr_AverageAnnualReturnYear01 (2.84%)
5 Years rr_AverageAnnualReturnYear05 9.27%
10 Years rr_AverageAnnualReturnYear10 7.23%
Wasatch-Hoisington U.S. Treasury Fund | Return After Taxes on Distributions | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.83%)
5 Years rr_AverageAnnualReturnYear05 7.69%
10 Years rr_AverageAnnualReturnYear10 5.58%
Wasatch-Hoisington U.S. Treasury Fund | Return After Taxes on Distributions and Sale of Fund Shares | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.70%)
5 Years rr_AverageAnnualReturnYear05 6.90%
10 Years rr_AverageAnnualReturnYear10 5.26%
Wasatch-Hoisington U.S. Treasury Fund | Barclays Capital U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.55%
5 Years rr_AverageAnnualReturnYear05 3.25%
10 Years rr_AverageAnnualReturnYear10 4.51%
[1] Wasatch Advisors, Inc. (Advisor), the Fund's investment advisor, has contractually agreed to reimburse the Investor Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 0.75% of average daily net assets until at least January 31, 2017 (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 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.