485BPOS

As filed with the Securities and Exchange Commission on September 20, 2013

Securities Act Registration No. 33-10451

Investment Company Act Registration No. 811-4920

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933                             X

Post-Effective Amendment No. 80                         X

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940     X

Amendment No. 82                                                  X

(Check appropriate box or boxes)

WASATCH FUNDS TRUST

(Exact Name of Registrant as Specified in Charter)

505 Wakara Way, Suite 300

Salt Lake City, UT 84108

(Address of Principal Executive Offices)

Registrant’s Telephone Number, including Area Code: (801) 533-0777

(Name and Address of Agent for Service)	Copy to:
Samuel S. Stewart, Jr. Wasatch Advisors, Inc. 505 Wakara Way, Suite 300 Salt Lake City, UT 84108	Eric F. Fess Chapman and Cutler LLP 111 West Monroe Street Chicago, IL 60603

Approximate Date of Proposed Public Offering: As soon as practicable following effectiveness.

It is proposed that this filing will become effective:

( X ) immediately upon filing pursuant to paragraph (b)

(    ) on              pursuant to paragraph (b)

(    ) 60 days after filing pursuant to paragraph (a)(1)

(    ) on              pursuant to paragraph (a)(1)

(    ) 75 days after filing pursuant to paragraph (a)(2)

(    ) on              pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

(    ) this Post-Effective Amendment designates a new effective date for a previously filed Post-Effective Amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended and the Investment Company Act of 1940, as amended, the Registrant certifies that this Post-Effective Amendment No. 80 to the Registration Statement meets all the requirements for effectiveness pursuant to Rule 485(b) of the Securities Act of 1933, as amended, and the Registrant has duly caused this Post-Effective Amendment No. 80 under the Securities Act of 1933, as amended and Post-Effective Amendment No. 82 under the Investment Company Act of 1940, as amended to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Salt Lake City, and the State of Utah on the 20^th day of September 2013.

WASATCH FUNDS TRUST

By	/s/ Samuel S. Stewart, Jr.
	Samuel S. Stewart, Jr., Ph.D., President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

Signature	Title	Date
/s/ Samuel S. Stewart, Jr. Samuel S. Stewart, Jr., Ph.D.	President and Trustee (principal executive officer)	September 20, 2013
/s/ Cindy B. Firestone Cindy B. Firestone	Treasurer (principal financial and accounting officer)	September 20, 2013
James U. Jensen* James U. Jensen, Esquire	Trustee	September 20, 2013
William R. Swinyard* William R. Swinyard	Trustee	September 20, 2013
D. James Croft* D. James Croft	Trustee	September 20, 2013
Miriam M. Allison* Miriam M. Allison	Trustee	September 20, 2013
Heikki Rinne* Heikki Rinne	Trustee	September 20, 2013
/s/ Russell L. Biles

Russell L. Biles

*Attorney-in-Fact

September 20, 2013

*Signed pursuant to powers of attorney are incorporated herein by reference to Exhibit (q) in Post-Effective Amendment No. 50 to the Registrant’s Registration Statement on Form N-1A filed with the Commission on March 31, 2010 and a power of attorney incorporated herein by reference to Exhibit q-1 in Post-Effective Amendment No. 65 to the Registrant’s Registration Statement on Form N-1A filed with the Commission on October 2, 2012.

Exhibit Index

Exhibit No.
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

WASATCH FUNDS TRUST

Prospectus Date

rr_ProspectusDate

Aug. 29, 2013

Wasatch Emerging Markets Small Cap Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

WASATCH EMERGING MARKETS SMALL CAP FUND — Summary

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is long-term growth 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)

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 39% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

39.00%

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, 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 companies tied economically to emerging markets.
Under normal market conditions, we will invest at least 80% of the Fund’s assets in the equity securities (including common stock, preferred stock and securities convertible into common stock) of companies that are tied economically to emerging market countries. 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 Morgan Stanley Capital International (MSCI) Emerging Markets Small Cap Index during the most recent 12 month period.
Emerging market countries are those currently included in the MSCI Emerging Markets Index. We will generally consider qualifying investments to be in companies that are listed on an exchange in an emerging market country, that have at least 50% of their assets in an emerging market country, or that derive at least 50% of their revenues or profits from goods produced or sold, investments made, or services performed in an emerging market country.
We travel extensively outside of the U.S. to visit companies and expect to meet with senior management. We use a process of quantitative screening followed by “bottom up” fundamental analysis to identify individual companies that we believe have above average revenue and earnings growth potential.
We do not use allocation models to restrict the Fund’s investments to certain regions, countries or industries.
The Fund may invest a large percentage of its assets in a few sectors, including consumer discretionary, financials, industrials, consumer staples, materials, energy, information technology and health 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.
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.
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.
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.

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]

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WASATCH EMERGING MARKETS SMALL CAP FUND — INVESTOR CLASS
Year by Year Total Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best and Worst Quarterly Returns

Best — 6/30/09	56.10%
Worst — 12/31/08	-32.16%

Year-to-date return through 6/30/13 was -2.49%.

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 Emerging Markets Small Cap 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

1.75%

Distribution/Service (12b-1) Fee

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.38%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.13%

^[1]

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

1.95%

1 Year

rr_ExpenseExampleYear01

$ 198

3 Years

rr_ExpenseExampleYear03

650

5 Years

rr_ExpenseExampleYear05

1,128

10 Years

rr_ExpenseExampleYear10

$ 2,447

2008

rr_AnnualReturn2008

(57.08%)

2009

rr_AnnualReturn2009

117.72%

2010

rr_AnnualReturn2010

41.22%

2011

rr_AnnualReturn2011

(14.01%)

2012

rr_AnnualReturn2012

27.75%

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

(2.49%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

56.10%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(32.16%)

1 Year

rr_AverageAnnualReturnYear01

27.75%

5 Years

rr_AverageAnnualReturnYear05

7.71%

Since Inception

rr_AverageAnnualReturnSinceInception

6.96%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 01, 2007

Wasatch Emerging Markets Small Cap Fund | Return after taxes on distributions | Investor Class Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

27.66%

5 Years

rr_AverageAnnualReturnYear05

7.65%

Since Inception

rr_AverageAnnualReturnSinceInception

6.88%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 01, 2007

Wasatch Emerging Markets Small Cap Fund | Return after taxes on distributions and sale of Fund shares | Investor Class Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

18.16%

5 Years

rr_AverageAnnualReturnYear05

6.65%

Since Inception

rr_AverageAnnualReturnSinceInception

5.99%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 01, 2007

Wasatch Emerging Markets Small Cap Fund | MSCI Emerging Markets Small Cap Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

22.22%

^[2]

5 Years

rr_AverageAnnualReturnYear05

0.21%

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

(0.05%)

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 01, 2007

^[2]

Wasatch Emerging Markets Small Cap Fund | MSCI Emerging Markets Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

18.22%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(0.92%)

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

(0.19%)

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 01, 2007

^[2]

[1] The Advisor has contractually agreed to reimburse the Investor Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 1.95% 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). 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.

[2] Source: MSCI. MSCI makes no express or implied warranties or representations and shall have no liability whatsoever with respect to any MSCI data contained herein. The MSCI data may not be further redistributed or used to create indices or financial products. This report is not approved or produced by MSCI.

XML

Wasatch Small Cap Growth Fund

WASATCH SMALL CAP GROWTH FUND — Summary

INVESTMENT OBJECTIVE

The Fund’s primary investment objective is long-term growth of capital.

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.

FEES AND EXPENSES OF THE FUND

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 (fees paid directly from your investment)

Shareholder Fees	Wasatch Small Cap Growth Fund Investor Class Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)	none
Redemption Fee (as a % of amount redeemed on shares held 60 days or less)	2.00%
Exchange Fee	none
Maximum Account Fee	none

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		Wasatch Small Cap Growth Fund Investor Class Shares
Management Fee		1.00%
Distribution/Service (12b-1) Fee		none
Other Expenses		0.24%
Acquired Fund Fees and Expenses		0.02%
Total Annual Fund Operating Expenses	[1]	1.26%

EXAMPLE

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:

Expense Example (USD $)	1 Year	3 Years	5 Years	10 Years
Wasatch Small Cap Growth Fund Investor Class	128	399	691	1,522

PORTFOLIO TURNOVER

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.

PRINCIPAL STRATEGIES

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).

PRINCIPAL RISKS

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.

HISTORICAL PERFORMANCE

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.

WASATCH SMALL CAP GROWTH FUND — INVESTOR CLASS
Year by Year Total Returns

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%.

Average Annual Total Returns — (as of 12/31/12)

Average Annual Total Returns Wasatch Small Cap Growth Fund	1 Year	5 Years	10 Years
Investor Class	16.95%	5.51%	9.66%
Investor Class Return after taxes on distributions	15.79%	5.16%	8.93%
Investor Class Return after taxes on distributions and sale of Fund shares	12.54%	4.73%	8.46%
Russell 2000® Growth Index (reflects no deductions for fees, expenses or taxes)	14.59%	3.49%	9.80%
Russell 2000® Index (reflects no deductions for fees, expenses or taxes)	16.35%	3.56%	9.72%

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.

[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.

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Wasatch Emerging Markets Small Cap Fund

WASATCH EMERGING MARKETS SMALL CAP FUND — Summary

INVESTMENT OBJECTIVE

The Fund’s investment objective is long-term growth of capital.

FEES AND EXPENSES OF THE FUND

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 (fees paid directly from your investment)

Shareholder Fees	Wasatch Emerging Markets Small Cap Fund Investor Class Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)	none
Redemption Fee (as a % of amount redeemed on shares held 60 days or less)	2.00%
Exchange Fee	none
Maximum Account Fee	none

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		Wasatch Emerging Markets Small Cap Fund Investor Class Shares
Management Fee		1.75%
Distribution/Service (12b-1) Fee		none
Other Expenses		0.38%
Total Annual Fund Operating Expenses	[1]	2.13%
Expense Reimbursement		(0.18%)
Total Annual Fund Operating Expenses After Expense Reimbursement		1.95%

EXAMPLE

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:

Expense Example (USD $)	1 Year	3 Years	5 Years	10 Years
Wasatch Emerging Markets Small Cap Fund Investor Class	198	650	1,128	2,447

PORTFOLIO TURNOVER

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 39% of the average value of its portfolio.

PRINCIPAL STRATEGIES

The Fund invests primarily in small companies tied economically to emerging markets.
Under normal market conditions, we will invest at least 80% of the Fund’s assets in the equity securities (including common stock, preferred stock and securities convertible into common stock) of companies that are tied economically to emerging market countries. 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 Morgan Stanley Capital International (MSCI) Emerging Markets Small Cap Index during the most recent 12 month period.
Emerging market countries are those currently included in the MSCI Emerging Markets Index. We will generally consider qualifying investments to be in companies that are listed on an exchange in an emerging market country, that have at least 50% of their assets in an emerging market country, or that derive at least 50% of their revenues or profits from goods produced or sold, investments made, or services performed in an emerging market country.
We travel extensively outside of the U.S. to visit companies and expect to meet with senior management. We use a process of quantitative screening followed by “bottom up” fundamental analysis to identify individual companies that we believe have above average revenue and earnings growth potential.
We do not use allocation models to restrict the Fund’s investments to certain regions, countries or industries.
The Fund may invest a large percentage of its assets in a few sectors, including consumer discretionary, financials, industrials, consumer staples, materials, energy, information technology and health care.

PRINCIPAL RISKS

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.
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.
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.

HISTORICAL PERFORMANCE

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.

WASATCH EMERGING MARKETS SMALL CAP FUND — INVESTOR CLASS
Year by Year Total Returns

Best and Worst Quarterly Returns

Best — 6/30/09	56.10%
Worst — 12/31/08	-32.16%

Year-to-date return through 6/30/13 was -2.49%.

Average Annual Total Returns — (as of 12/31/12)

Average Annual Total Returns Wasatch Emerging Markets Small Cap Fund		1 Year	5 Years	Since Inception	Inception Date
Investor Class		27.75%	7.71%	6.96%	Oct. 01, 2007
Investor Class Return after taxes on distributions		27.66%	7.65%	6.88%	Oct. 01, 2007
Investor Class Return after taxes on distributions and sale of Fund shares		18.16%	6.65%	5.99%	Oct. 01, 2007
MSCI Emerging Markets Small Cap Index (reflects no deductions for fees, expenses or taxes)	[1]	22.22%	0.21%	(0.05%)	Oct. 01, 2007
MSCI Emerging Markets Index (reflects no deductions for fees, expenses or taxes)	[1]	18.22%	(0.92%)	(0.19%)	Oct. 01, 2007

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.

[1] The Advisor has contractually agreed to reimburse the Investor Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 1.95% 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). 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.

[1] Source: MSCI. MSCI makes no express or implied warranties or representations and shall have no liability whatsoever with respect to any MSCI data contained herein. The MSCI data may not be further redistributed or used to create indices or financial products. This report is not approved or produced by MSCI.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

WASATCH FUNDS TRUST

Prospectus Date

rr_ProspectusDate

Aug. 29, 2013

Institutional Class | Wasatch Small Cap Value Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

WASATCH SMALL CAP VALUE FUND — Summary

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s 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, 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). A higher portfolio turnover rate 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 55% of the average of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

55.00%

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

The Fund’s operating expenses have been restated to reflect a reduction in the management fee, effective January 31, 2012, as if such changes had been in effect during the fiscal year ended September 30, 2012. The information has been restated to better reflect anticipated expenses of the Fund.

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 Institutional Class of the Fund with the cost of investing in other mutual funds. The example assumes that you invested $10,000 in the Institutional 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 Fund’s operating expenses (as a percentage of net assets) 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 companies.
Under normal market conditions, we will invest at least 80% of the Fund’s net assets in the equity securities (including common stock, preferred stock and securities convertible into common stock, warrants and rights, and other securities with equity securities which includes any instrument tied to a specific security or basket of securities, such as equity-linked derivatives and notes, certain options on common stock, and exchange traded funds) 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.
The Fund may also invest in growth companies if the Advisor believes that current valuation is at a sufficient discount to the projected long-term earnings growth rate. 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 are temporarily under- valued but have significant potential for stock price appreciation. Our analysis may include studying a company’s financial state- ments, visiting company facilities, and meeting with executive management, suppliers and customers.
We typically look for companies that we believe fall into one of these three categories at the time of purchase:

• Undiscovered Gems — Companies with good growth potential which have yet to be broadly discovered by Wall Street analysts, thus leaving them attractively undervalued relative to their expected growth.
• Fallen Angels — High quality growth companies that have experienced a temporary setback and therefore have appealing valu ations relative to their long term growth potential.
• Quality Value — Quality companies with earnings potential that is not fully reflected in their stock prices.

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

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 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.
Value Investing Risk. Value investing attempts to identify strong companies whose stocks 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 mar ket, their prices may go down, or that stocks judged to be undervalued may actually be appropriately priced.
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.
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.
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.
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 Fund has performed over time. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund 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 Fund’s best and worst quarterly performance 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. The Fund’s Institutional Class commenced operations on January 31, 2012. The calendar year returns in the bar chart, the best and worst quarterly returns and the average annual total returns table are based on the Fund’s Investor Class shares. Investor Class shares are not offered in this Prospectus. Performance for Investor Class shares would be similar 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. 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 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 Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

WASATCH SMALL CAP VALUE FUND — INVESTOR CLASS
Year by Year Total Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best and Worst Quarterly Returns

Best — 6/30/09	33.91%
Worst — 12/31/08	-34.04%

Year-to-Date through 6/30/13 was 17.62%.

Bar Chart, Returns for Class Not Offered in Prospectus [Text]

rr_BarChartReturnsForClassNotOfferedInProspectus

The Fund’s Institutional Class commenced operations on January 31, 2012. The calendar year returns in the bar chart, the best and worst quarterly returns and the average annual total returns table are based on the Fund’s Investor Class shares. Investor Class shares are not offered in this Prospectus. Performance for Investor Class shares would be similar 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.

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.

Institutional Class | Wasatch Small Cap Value 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%

^[1]

Distribution/Service (12b-1) Fee

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

0.66%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.66%

^[1],[2]

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.51%)

^[1]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

1.15%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 117

3 Years

rr_ExpenseExampleYear03

473

5 Years

rr_ExpenseExampleYear05

853

10 Years

rr_ExpenseExampleYear10

$ 1,922

Institutional Class | Wasatch Small Cap Value Fund | Investor Class

Risk/Return:

rr_RiskReturnAbstract

2003

rr_AnnualReturn2003

54.57%

2004

rr_AnnualReturn2004

21.58%

2005

rr_AnnualReturn2005

4.76%

2006

rr_AnnualReturn2006

14.84%

2007

rr_AnnualReturn2007

(3.00%)

2008

rr_AnnualReturn2008

(47.75%)

2009

rr_AnnualReturn2009

55.91%

2010

rr_AnnualReturn2010

25.52%

2011

rr_AnnualReturn2011

(5.22%)

2012

rr_AnnualReturn2012

16.52%

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

17.62%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

33.91%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(34.04%)

1 Year

rr_AverageAnnualReturnYear01

16.52%

5 Years

rr_AverageAnnualReturnYear05

2.46%

10 Years

rr_AverageAnnualReturnYear10

9.49%

Institutional Class | Wasatch Small Cap Value Fund | Return after taxes on distributions | Investor Class

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.52%

5 Years

rr_AverageAnnualReturnYear05

2.46%

10 Years

rr_AverageAnnualReturnYear10

8.05%

Institutional Class | Wasatch Small Cap Value Fund | Return after taxes on distributions and sale of Fund shares | Investor Class

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.74%

5 Years

rr_AverageAnnualReturnYear05

2.11%

10 Years

rr_AverageAnnualReturnYear10

7.96%

Institutional Class | Wasatch Small Cap Value Fund | Russell 2000® Value Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

18.05%

5 Years

rr_AverageAnnualReturnYear05

3.55%

10 Years

rr_AverageAnnualReturnYear10

9.50%

Institutional Class | Wasatch Small Cap Value 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 Fund's operating expenses have been restated to reflect a reduction in the management fee, effective January 31, 2012, as if such changes had been in effect during the fiscal year ended September 30, 2012. The information has been restated to better reflect anticipated expenses of the Fund.

[2] Wasatch Advisors, Inc., the Fund's investment advisor, has contractually agreed to reimburse the Institutional Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 1.15% until at least January 31, 2015 (excluding dividend expense on short sales/interest expense, interest, taxes, brokerage commissions, other investment related costs and extraordinary expenses). The Board of Trustees is the only party that may terminate the contractual limitation prior to the contract's expiration date. The Advisor may rescind the contractual limitation on expenses at any time after its expiration date.

XML

Institutional Class | Wasatch Small Cap Value Fund

WASATCH SMALL CAP VALUE FUND — Summary

INVESTMENT OBJECTIVE

The Fund’s investment objective is long-term growth of capital.

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.

FEES AND EXPENSES OF THE FUND

The tables below describe the fees and expenses that you may pay if you buy, sell or hold shares of the Fund.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	Institutional Class Wasatch Small Cap Value Fund Institutional Class Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)	none
Redemption Fee (as a % of amount redeemed on shares held 60 days or less)	2.00%
Exchange Fee	none
Maximum Account Fee	none

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		Institutional Class Wasatch Small Cap Value Fund Institutional Class Shares
Management Fee	[1]	1.00%
Distribution/Service (12b-1) Fee	[1]	none
Other Expenses	[1]	0.66%
Total Annual Fund Operating Expenses	[1][2]	1.66%
Expense Reimbursement	[1]	(0.51%)
Total Annual Fund Operating Expenses After Expense Reimbursement	[1]	1.15%

EXAMPLE

This example is intended to help you compare the cost of investing in the Institutional Class of the Fund with the cost of investing in other mutual funds. The example assumes that you invested $10,000 in the Institutional 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 Fund’s operating expenses (as a percentage of net assets) 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:

Expense Example (USD $)	1 Year	3 Years	5 Years	10 Years
Institutional Class Wasatch Small Cap Value Fund	117	473	853	1,922

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate 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 55% of the average of its portfolio.

PRINCIPAL STRATEGIES

The Fund invests primarily in small companies.
Under normal market conditions, we will invest at least 80% of the Fund’s net assets in the equity securities (including common stock, preferred stock and securities convertible into common stock, warrants and rights, and other securities with equity securities which includes any instrument tied to a specific security or basket of securities, such as equity-linked derivatives and notes, certain options on common stock, and exchange traded funds) 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.
The Fund may also invest in growth companies if the Advisor believes that current valuation is at a sufficient discount to the projected long-term earnings growth rate. 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 are temporarily under- valued but have significant potential for stock price appreciation. Our analysis may include studying a company’s financial state- ments, visiting company facilities, and meeting with executive management, suppliers and customers.
We typically look for companies that we believe fall into one of these three categories at the time of purchase:

• Undiscovered Gems — Companies with good growth potential which have yet to be broadly discovered by Wall Street analysts, thus leaving them attractively undervalued relative to their expected growth.
• Fallen Angels — High quality growth companies that have experienced a temporary setback and therefore have appealing valu ations relative to their long term growth potential.
• Quality Value — Quality companies with earnings potential that is not fully reflected in their stock prices.

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

PRINCIPAL RISKS

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 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.
Value Investing Risk. Value investing attempts to identify strong companies whose stocks 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 mar ket, their prices may go down, or that stocks judged to be undervalued may actually be appropriately priced.
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.
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.
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.
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.

HISTORICAL PERFORMANCE

The following tables provide information on how the Fund has performed over time. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund 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 Fund’s best and worst quarterly performance 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. The Fund’s Institutional Class commenced operations on January 31, 2012. The calendar year returns in the bar chart, the best and worst quarterly returns and the average annual total returns table are based on the Fund’s Investor Class shares. Investor Class shares are not offered in this Prospectus. Performance for Investor Class shares would be similar 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. Performance information is updated regularly and is available on the Fund’s website www.WasatchFunds.com.

WASATCH SMALL CAP VALUE FUND — INVESTOR CLASS
Year by Year Total Returns

Best and Worst Quarterly Returns

Best — 6/30/09	33.91%
Worst — 12/31/08	-34.04%

Year-to-Date through 6/30/13 was 17.62%.

Average Annual Total Returns — (as of 12/31/12)

Average Annual Total Returns Institutional Class Wasatch Small Cap Value Fund	1 Year	5 Years	10 Years
Investor Class	16.52%	2.46%	9.49%
Investor Class Return after taxes on distributions	16.52%	2.46%	8.05%
Investor Class Return after taxes on distributions and sale of Fund shares	10.74%	2.11%	7.96%
Russell 2000® Value Index (reflects no deductions for fees, expenses or taxes)	18.05%	3.55%	9.50%
Russell 2000® Index (reflects no deductions for fees, expenses or taxes)	16.35%	3.56%	9.72%

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.

[1] The Fund's operating expenses have been restated to reflect a reduction in the management fee, effective January 31, 2012, as if such changes had been in effect during the fiscal year ended September 30, 2012. The information has been restated to better reflect anticipated expenses of the Fund.

[2] Wasatch Advisors, Inc., the Fund's investment advisor, has contractually agreed to reimburse the Institutional Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 1.15% until at least January 31, 2015 (excluding dividend expense on short sales/interest expense, interest, taxes, brokerage commissions, other investment related costs and extraordinary expenses). The Board of Trustees is the only party that may terminate the contractual limitation prior to the contract's expiration date. The Advisor may rescind the contractual limitation on expenses at any time after its expiration date.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	WASATCH FUNDS TRUST
Prospectus Date	rr_ProspectusDate	Aug. 29, 2013
Document Creation Date	dei_DocumentCreationDate	Aug. 29, 2013

XML

Investor Class | Wasatch Small Cap Value Fund

WASATCH SMALL CAP VALUE FUND — Summary

INVESTMENT OBJECTIVE

The Fund’s investment objective is long-term growth of capital.

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.

FEES AND EXPENSES OF THE FUND

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 (fees paid directly from your investment)

Shareholder Fees	Investor Class Wasatch Small Cap Value Fund Investor Class Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)	none
Redemption Fee (as a % of amount redeemed on shares held 60 days or less)	2.00%
Exchange Fee	none
Maximum Account Fee	none

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		Investor Class Wasatch Small Cap Value Fund Investor Class Shares
Management Fee	[1]	1.00%
Distribution/Service (12b-1) Fee	[1]	none
Other Expenses	[1]	0.29%
Total Annual Fund Operating Expenses	[1][2]	1.29%

EXAMPLE

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:

Expense Example (USD $)	1 Year	3 Years	5 Years	10 Years
Investor Class Wasatch Small Cap Value Fund	131	408	707	1,556

PORTFOLIO TURNOVER

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 55% of the average value of its portfolio.

PRINCIPAL STRATEGIES

The Fund invests primarily in small companies.
Under normal market conditions, we will invest at least 80% of the Fund’s net assets in the equity securities (including common stock, preferred stock and securities convertible into common stock, warrants and rights, and other securities with equity securities which includes any instrument tied to a specific security or basket of securities, such as equity-linked derivatives and notes, certain options on common stock, and exchange traded funds) 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.
The Fund may also invest in growth companies if the Advisor believes that current valuation is at a sufficient discount to the projected long-term earnings growth rate. 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 are temporarily undervalued but have significant potential for stock price appreciation. Our analysis may include studying a company’s financial statements, visiting company facilities, and meeting with executive management, suppliers and customers.
We typically look for companies that we believe fall into one of these three categories at the time of purchase:

• Undiscovered Gems — Companies with good growth potential which have yet to be broadly discovered by Wall Street analysts, thus leaving them attractively undervalued relative to their expected growth.
• Fallen Angels — High quality growth companies that have experienced a temporary setback and therefore have appealing valuations relative to their long term growth potential.
• Quality Value — Quality companies with earnings potential that is not fully reflected in their stock prices.

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

PRINCIPAL RISKS

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.
Value Investing Risk. Value investing attempts to identify strong companies whose stocks 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. 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.
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.
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.
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.

HISTORICAL PERFORMANCE

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.

WASATCH SMALL CAP VALUE FUND — INVESTOR CLASS
Year by Year Total Returns

Best and Worst Quarterly Returns

Best — 6/30/09	33.91%
Worst — 12/31/08	-34.04%

Year-to-date through 6/30/13 was 17.41%.

Average Annual Total Returns — (as of 12/31/12)

Average Annual Total Returns Investor Class	1 Year	5 Years	10 Years
Wasatch Small Cap Value Fund	16.52%	2.46%	9.49%
Wasatch Small Cap Value Fund Return after taxes on distributions	16.52%	2.46%	8.05%
Wasatch Small Cap Value Fund Return after taxes on distributions and sale of Fund shares	10.74%	2.11%	7.96%
Wasatch Small Cap Value Fund Russell 2000® Value Index (reflects no deductions for fees, expenses or taxes)	18.05%	3.55%	9.50%
Wasatch Small Cap Value Fund Russell 2000® Index (reflects no deductions for fees, expenses or taxes)	16.35%	3.56%	9.72%

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.

[1] The Fund's operating expenses have been restated to reflect a reduction in the management fee, effective January 31, 2012, as if such changes had been in effect during the fiscal year ended September 30, 2012. The information has been restated to better reflect anticipated expenses of the Fund.

[2] 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). 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.

XML

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Value

Risk/Return:

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Registrant Name

dei_EntityRegistrantName

WASATCH FUNDS TRUST

Prospectus Date

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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.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

WASATCH FUNDS TRUST

Prospectus Date

rr_ProspectusDate

Aug. 29, 2013

Investor Class | Wasatch Small Cap Value Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

WASATCH SMALL CAP VALUE FUND — Summary

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s 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 55% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

55.00%

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

The Fund’s operating expenses have been restated to reflect a reduction in the management fee, effective January 31, 2012, as if such changes had been in effect during the fiscal year ended September 30, 2012. The information has been restated to better reflect anticipated expenses of the Fund.

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 companies.
Under normal market conditions, we will invest at least 80% of the Fund’s net assets in the equity securities (including common stock, preferred stock and securities convertible into common stock, warrants and rights, and other securities with equity securities which includes any instrument tied to a specific security or basket of securities, such as equity-linked derivatives and notes, certain options on common stock, and exchange traded funds) 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.
The Fund may also invest in growth companies if the Advisor believes that current valuation is at a sufficient discount to the projected long-term earnings growth rate. 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 are temporarily undervalued but have significant potential for stock price appreciation. Our analysis may include studying a company’s financial statements, visiting company facilities, and meeting with executive management, suppliers and customers.
We typically look for companies that we believe fall into one of these three categories at the time of purchase:

• Undiscovered Gems — Companies with good growth potential which have yet to be broadly discovered by Wall Street analysts, thus leaving them attractively undervalued relative to their expected growth.
• Fallen Angels — High quality growth companies that have experienced a temporary setback and therefore have appealing valuations relative to their long term growth potential.
• Quality Value — Quality companies with earnings potential that is not fully reflected in their stock prices.

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

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.
Value Investing Risk. Value investing attempts to identify strong companies whose stocks 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. 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.
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.
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.
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 VALUE FUND — INVESTOR CLASS
Year by Year Total Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best and Worst Quarterly Returns

Best — 6/30/09	33.91%
Worst — 12/31/08	-34.04%

Year-to-date through 6/30/13 was 17.41%.

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.

Investor Class | Wasatch Small 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

1.00%

^[1]

Distribution/Service (12b-1) Fee

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

0.29%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.29%

^[1],[2]

1 Year

rr_ExpenseExampleYear01

$ 131

3 Years

rr_ExpenseExampleYear03

408

5 Years

rr_ExpenseExampleYear05

707

10 Years

rr_ExpenseExampleYear10

$ 1,556

2003

rr_AnnualReturn2003

54.57%

2004

rr_AnnualReturn2004

21.58%

2005

rr_AnnualReturn2005

4.76%

2006

rr_AnnualReturn2006

14.84%

2007

rr_AnnualReturn2007

(3.00%)

2008

rr_AnnualReturn2008

(47.75%)

2009

rr_AnnualReturn2009

55.91%

2010

rr_AnnualReturn2010

25.52%

2011

rr_AnnualReturn2011

(5.22%)

2012

rr_AnnualReturn2012

16.52%

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

17.41%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

33.91%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(34.04%)

1 Year

rr_AverageAnnualReturnYear01

16.52%

5 Years

rr_AverageAnnualReturnYear05

2.46%

10 Years

rr_AverageAnnualReturnYear10

9.49%

Investor Class | Wasatch Small Cap Value Fund | Return after taxes on distributions | Investor Class Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.52%

5 Years

rr_AverageAnnualReturnYear05

2.46%

10 Years

rr_AverageAnnualReturnYear10

8.05%

Investor Class | Wasatch Small Cap Value Fund | Return after taxes on distributions and sale of Fund shares | Investor Class Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.74%

5 Years

rr_AverageAnnualReturnYear05

2.11%

10 Years

rr_AverageAnnualReturnYear10

7.96%

Investor Class | Wasatch Small Cap Value Fund | Russell 2000® Value Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

18.05%

5 Years

rr_AverageAnnualReturnYear05

3.55%

10 Years

rr_AverageAnnualReturnYear10

9.50%

Investor Class | Wasatch Small Cap Value 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 Fund's operating expenses have been restated to reflect a reduction in the management fee, effective January 31, 2012, as if such changes had been in effect during the fiscal year ended September 30, 2012. The information has been restated to better reflect anticipated expenses of the Fund.

[2] 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). 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.

XML

Document and Entity Information	12 Months Ended
	Aug. 29, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Mar. 31, 2013
Registrant Name	WASATCH FUNDS TRUST
Central Index Key	0000806633
Amendment Flag	false
Document Creation Date	Aug. 29, 2013
Document Effective Date	Aug. 29, 2013
Prospectus Date	Aug. 29, 2013