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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName WASATCH FUNDS TRUST
Prospectus Date rr_ProspectusDate Jan. 31, 2016
Wasatch-1st Source Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading WASATCH-1ST SOURCE INCOME FUND® — SUMMARY
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund’s investment objective is to seek current income consistent with the preservation of capital.
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)
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 44% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.00%
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 operating expenses (as a percentage of net assets) of the Fund’s Investor Class remained the same. 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 normally invests at least 65% of its total assets in debt securities of all types, including corporate bonds, U.S. government bonds, and variable and floating rate securities.
Consistent with the Wasatch-1st Source Income Fund’s (Income Fund) investment objective, 1st Source Corporation Investment Advisors, Inc. (1st Source), the Fund’s Sub-Advisor, expects the Fund to:
  • Invest substantially all, but in no event less than 65%, of the Fund’s total assets at the time of purchase in debt securities.
  • Invest in fixed income securities consisting of bonds, fixed income preferred stocks, debentures, notes, zero-coupon securities, mortgage-related and other asset-backed securities, state, municipal or industrial revenue bonds, obligations issued or guaranteed by agencies or instrumentalities of the U.S. government, debt securities convertible into or exchangeable for common stocks, foreign debt securities, income participation loans, guaranteed investment contracts, first mortgage loans and participation certificates in pools of mortgages issued or guaranteed by agencies or instrumentalities of the U.S. government.
  • Typically invest in debt securities rated at the time of purchase within the four highest rating categories assigned by one or more nationally recognized statistical rating organizations (NRSROs) or, if unrated, those which 1st Source deems to be of comparable quality. The Fund may also invest up to 10% of its total assets in non-investment grade debt securities.
The Fund may engage in repurchase transactions, credit default swaps, forward contracts, and may also engage in futures transactions solely for hedging purposes, and may invest in options on futures. The Fund may also invest in other investment companies.
The Fund may purchase securities on a when-issued or delayed delivery basis, in which a security’s price and yield are fixed on a specific date, but payment and delivery are scheduled for a future date beyond the standard settlement period.
It is anticipated that the Fund will have an average maturity of 3-1/2 years to 5 years and an effective duration of 2-1/2 years to 4-1/2 years.
The Fund may invest a large percentage of its assets in a few sectors, including financials and heath care.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund may invest a large percentage of its assets in a few sectors, including financials and heath care.
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:
Interest Rate Risk. Interest rate risk is the risk that a debt security’s value will decline due to changes in market interest rates. Even though some interest-bearing 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.
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. Credit risk is affected by the issuer’s credit status, and is generally higher for non-investment grade securities.
Income Risk. Income risk is the potential for a decline in the Fund’s income due to falling interest rates.
Non-Investment Grade Securities Risk. Non-investment grade securities (also known as “high yield” or “junk bonds”), those rated below investment grade by the primary rating agencies (e.g., below BB/Ba by S&P/Moody’s) tend to have more volatile prices and increased price sensitivity to changing interest rates and adverse economic and business developments than investment grade securities. In addition, compared to investments in investment grade securities, investments in non-investment grade securities are subject to greater risk of loss due to default by the issuer or decline in the issuer’s credit quality. There is a greater likelihood that adverse economic or company-specific events will make the issuer unable to make interest and/or principal payments, and more susceptible to negative market sentiment, leading to depressed prices and decreased liquidity for the non-investment grade securities.
Convertible Securities Risk. The Fund may invest in convertible securities, which are preferred stocks or debt obligations that are convertible into common stock. Generally, convertible securities offer lower interest or dividend yields than non-convertible securities of similar quality, and have less potential for gains or capital appreciation in a rising stock market than other equity securities. They tend to be more volatile than other fixed income securities, and the markets for convertible securities may be less liquid than the markets for common stocks or bonds. Convertible securities have both equity and fixed income risk characteristics. Like all fixed income securities, the value of convertible securities is susceptible to the risk of market losses attributable to changes in interest rates. The market value of convertible securities tends to decline as interest rates increase. If, however, the market price of the common stock underlying a convertible security approaches or exceeds the conversion price of the convertible security then the convertible security tends to reflect the market price of the underlying common stock. In such a case, a convertible security may lose much or all of its value if the value of the underlying common stock then falls below the conversion price of the security. As the market price of the underlying common stock declines, the convertible security tends to trade increasingly based on its fixed income characteristics, and thus, may not necessarily decline in price as much as the underlying common stock. Additionally, an issuer may have the right to buy back a convertible security at a time and price that is unfavorable to the Fund.
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.
Ratings Agency Risk. Credit quality in the high yield securities market can change suddenly and unexpectedly, and even recently issued credit ratings may not fully reflect the actual risks posed by a particular high yield security. For these reasons, it is generally the policy of 1st Source not to rely exclusively on ratings issued by established NRSROs, but to supplement such ratings with its own independent and ongoing review of credit quality. The achievement of the Fund’s investment objective by investments in such securities may be more dependent on 1st Source’s credit analysis than is the case for higher quality bonds. Should the rating of a portfolio security be downgraded, 1st Source will determine whether it is in the best interests of the Fund to retain or dispose of such security.
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.
When-Issued Securities Risk. The Fund may purchase securities on a “when-issued” basis (i.e., for delivery beyond the normal settlement date at a stated price and yield). When the Fund engages in “when-issued” transactions, it relies on the seller to consummate the trade. Failure of the seller to do so may result in the Fund incurring a loss or missing the opportunity to obtain a price considered to be advantageous. The Fund will engage in “when-issued” delivery transactions only for the purpose of acquiring portfolio securities consistent with the Fund’s investment objective and strategies and not for investment leverage.
Investment Companies Risk. The Fund may invest in the shares of other investment companies, including foreign and domestic registered and unregistered open-end funds, closed-end funds, unit investment trusts and exchange-traded funds. Investing in another investment company subjects the Fund to the same risks associated with investing in the securities held by the applicable investment company and the investment strategies employed by such funds (such as the use of leverage). In addition, the benefit of investing in another investment company is largely dependent on the skill of the investment advisor of the underlying company and whether the associated fees and costs involved with investing in such company are offset by the potential gains. As a shareholder in an investment company, the Fund will bear its ratable share of that investment company’s expenses including advisory and administrative fees. Fund shareholders would therefore be subject to duplicative expenses to the extent that the Fund invests in other investment companies.
Derivatives Risk. The Fund may suffer a loss from its use of put and call options and futures contracts, which are forms of derivatives. Derivatives can amplify a gain or loss, potentially earning or losing substantially more money than the actual cost of the derivative instrument, with the potential for unlimited losses on certain instruments. Derivatives may be difficult to value, may become illiquid, and may affect the timing and character of taxes payable by shareholders.
Credit Default Swaps Risk. The Fund may enter into credit default swaps, interest rate swaps and currency swaps. Swap agreements will tend to shift a fund’s investment exposure from one type of investment to another. Depending on how they are used, swap agreements may increase or decrease the overall volatility of the Fund’s portfolio and its share price and yield. Swaps are subject to counterparty risk. The Fund bears the loss of the amount expected to be received under a swap agreement in the event of the default or bankruptcy of a swap agreement counterparty. For this reason, the Fund will enter into swap agreements only with counterparties that meet certain standards of creditworthiness.
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.
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 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 information on how the Investor Class of the Fund (and Predecessor Fund for periods prior to December 15, 2008) 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 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 bond market index. In addition, the Predecessor Fund was advised by a different investment advisor and subject to different expenses, which may have produced different investment results. The portfolio manager of the Fund, however, was also the portfolio manager of the Predecessor 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 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 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 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-1ST SOURCE INCOME FUND — INVESTOR CLASS
Year by Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best and Worst Quarterly Returns
Best — 9/30/2006      2.85%   
Worst — 6/30/2013      -2.01%   
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-1st Source Income 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 0.55%
Distribution/Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.17%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.73% [1]
1 Year rr_ExpenseExampleYear01 $ 75
3 Years rr_ExpenseExampleYear03 234
5 Years rr_ExpenseExampleYear05 407
10 Years rr_ExpenseExampleYear10 $ 908
2006 rr_AnnualReturn2006 3.72%
2007 rr_AnnualReturn2007 5.61%
2008 rr_AnnualReturn2008 3.54%
2009 rr_AnnualReturn2009 5.98%
2010 rr_AnnualReturn2010 4.22%
2011 rr_AnnualReturn2011 3.86%
2012 rr_AnnualReturn2012 2.81%
2013 rr_AnnualReturn2013 (1.49%)
2014 rr_AnnualReturn2014 2.66%
2015 rr_AnnualReturn2015 0.75%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2006
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.85%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.01%)
1 Year rr_AverageAnnualReturnYear01 0.75%
5 Years rr_AverageAnnualReturnYear05 1.70%
10 Years rr_AverageAnnualReturnYear10 3.14%
Wasatch-1st Source Income Fund | Return After Taxes on Distributions | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.04%
5 Years rr_AverageAnnualReturnYear05 0.98%
10 Years rr_AverageAnnualReturnYear10 2.12%
Wasatch-1st Source Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | Investor Class Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.43%
5 Years rr_AverageAnnualReturnYear05 1.02%
10 Years rr_AverageAnnualReturnYear10 2.05%
Wasatch-1st Source Income Fund | Barclays Capital U.S. Intermediate Government/Credit Bond Index (reflects no deductions for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.07%
5 Years rr_AverageAnnualReturnYear05 2.58%
10 Years rr_AverageAnnualReturnYear10 4.04%
[1] 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.