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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Period End Date dei_DocumentPeriodEndDate Dec. 31, 2013
Registrant Name dei_EntityRegistrantName WILSHIRE VARIABLE INSURANCE TRUST
CIK dei_EntityCentralIndexKey 0001026708
Amendment dei_AmendmentFlag false
Creation Date dei_DocumentCreationDate Apr. 29, 2014
Effective Date dei_DocumentEffectiveDate May 01, 2014
Prospectus Date rr_ProspectusDate May 01, 2014
Wilshire VIT Equity Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return rr_RiskReturnHeading

FUND SUMMARIES

 

Equity Fund
Investment objective: rr_ObjectiveHeading

Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Equity Fund (the “Fund”) seeks long-term capital growth.
Secondary objectives rr_ObjectiveSecondaryTextBlock

As a secondary objective, the Fund seeks conservation of principal and production of income.
Fees and expenses of the fund: rr_ExpenseHeading

Fees and Expenses of the Fund
Fees and expenses of the fund, narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. The table below does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher.
Annual fund operating expenses, heading rr_OperatingExpensesCaption

Annual Fund Operating Expenses* (expenses that you pay each year as a percentage of the value of your investment):
Portfolio turnover, heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio turnover, narrative 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 241% of the average value of its portfolio.
Portfolio Turnover Rate rr_PortfolioTurnoverRate 241.00%
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

Example: This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The example does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Strategy, Narrative rr_StrategyNarrativeTextBlock

The Fund invests, under normal circumstances, at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities. The Fund ordinarily invests in common stocks of domestic companies and in other affiliated and non-affiliated equity investment companies, including the Large Company Growth Portfolio and the Large Company Value Portfolio. As a matter of investment policy, the Fund expects to invest 0% to 50% of its assets in the Large Company Value Portfolio and 0% to 50% of its assets in the Large Company Growth Portfolio, but no more than 70% in both funds on a combined basis. The operating companies in which the Fund invests vary in size and operating history, they may or may not be listed on a stock exchange and they may be in any industry.

 

Included within the definition of “domestic companies” are companies that are not incorporated in the U.S. but have one or more of the following attributes: principal place of business in the U.S.; substantial portion of income derived from activities in the U.S.; equity securities traded on a major U.S. stock exchange or included in a recognized index of U.S. stocks; or financial statements that comply with U.S. accounting standards. Thus, securities of these issuers are not subject to the 10% limitation on securities of foreign issuers. The Fund may, at times, have minimal exposure to non-domestic companies which do not satisfy these criteria.

 

The Fund uses a multi-manager strategy with subadvisers who may employ different strategies. Santa Barbara Asset Management, LLC (“Santa Barbara”) and TWIN Capital Management, Inc. (“TWIN”) each manage a portion of the Fund’s portfolio. Santa Barbara employs a Dividend Growth strategy in managing its portion of the Fund’s portfolio which takes a long-term investment approach, seeking to invest in companies that have sustainable business models selling at attractive valuations. TWIN employs a quantitative multi-factor stock selection model in managing its portion of the portfolio to purchase large and middle capitalization equity securities that TWIN believes are undervalued, have rising expected earnings, display recent price gains and exhibit more stable and sustainable earnings relative to peer group stocks.

 

The following describes the types of securities in which the Large Company Growth Portfolio is permitted to invest:

 

• The Large Company Growth Portfolio focuses on the large company growth segment of the U.S. equity market.

 

• The Large Company Growth Portfolio invests substantially all of its assets in common stock of companies with large market capitalizations—generally greater than $10 billion at the time of purchase.

 

• The Large Company Growth Portfolio invests in companies that historically have above average earnings or sales growth and retention of earnings, often such companies have above average price to earnings ratios.

 

• The Large Company Growth Portfolio uses a multi-manager strategy with multiple subadvisers who employ different strategies.

 

The following describes the types of securities in which the Large Company Value Portfolio is permitted to invest:

 

• The Large Company Value Portfolio focuses on the large company value segment of the U.S. equity market.

 

• The Large Company Value Portfolio invests substantially all of its assets in the common stock companies with large market capitalizations—generally greater than $10 billion at the time of purchase.

 

• The Large Company Value Portfolio invests, generally, in companies with relatively low price to book value ratios, low price to earnings ratios and higher than average dividend yields (which means that their prices are low relative to the size of their dividends).

 

• The Large Company Value Portfolio uses a multi-manager strategy with multiple subadvisers who employ different strategies.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

You may lose money by investing in the Fund. By investing in the Fund, an investor also assumes the same types of risks, either indirectly or directly, as investing in the Large Company Growth Portfolio and the Large Company Value Portfolio. Investing in the Fund involves the following principal risks:

 

Equity Risk. The principal risk of investing in the Fund, the Large Company Growth Portfolio and the Large Company Value Portfolio is equity risk. This is the risk that the prices of stocks held by the Fund, the Large Company Growth Portfolio and the Large Company Value Portfolio will change due to general market and economic conditions, perceptions regarding the industries in which the companies participate, and each company’s particular circumstances. Equity investments, including common stocks, tend to be more volatile than bonds and money market instruments. The value of the Fund’s shares will go up and down due to movement in the collective returns of the individual securities held by the Fund. Because common stocks are subordinate to preferred stocks in a company’s capital structure, in a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

 

Market Risk. For equity securities, stock market movements will affect the Fund’s, the Large Company Growth Portfolio’s and the Large Company Value Portfolio’s share price on a daily basis. Declines in value are possible because of declines in the stock market in general or because of a decline in the specific securities held by the Fund, the Large Company Growth Portfolio or the Large Company Value Portfolio. There is also the possibility that the price of the security will fall because the market perceives that there is or will be a deterioration in the fundamental value of the issuer or poor earnings performance by the issuer. Market risk may affect a single company, industry, sector or the market as a whole. For debt securities, the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole.

 

Style Risk. The risk of investing in the Large Company Growth Portfolio or the Large Company Value Portfolio is the risk that the portfolios’ growth or value styles will perform poorly or fall out of favor with investors. For example, at times the market may favor large capitalization stocks over small capitalization stocks, value stocks over growth stocks, or vice versa.

 

Recent Market Events Risk. Over the past several years, the global financial crisis has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets.

 

Governmental and non-governmental issuers (notably in Europe) have defaulted on, or been forced to restructure their debts; and many other issuers have faced difficulties obtaining credit or refinancing existing obligations. These market conditions may continue, worsen or spread, including in the United States, Europe and elsewhere. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as reduce the value and liquidity of certain securities.

 

Multi-Managed Fund Risk. The Fund, the Large Company Growth Portfolio and the Large Company Value Portfolio are multi-managed funds with multiple subadvisers who employ different strategies. As a result, the Equity Fund, the Large Company Growth Portfolio and the Large Company Value Portfolio may have buy and sell transactions in the same security on the same day.

 

Asset Allocation Risk. Although asset allocation among different asset categories and investment strategies generally reduces risk and exposure to any one category or strategy, the risk remains that the Adviser may favor an asset category or investment strategy that performs poorly relative to other asset categories and investment strategies.

 

Foreign Investment Risk. Foreign investments often involve risks such as political instability, differences in financial reporting standards and less stringent regulation of securities markets. These risks are magnified in less-established, emerging markets.

 

Preferred Stock Risk. Preferred stocks are typically subordinated to bonds and other debt instruments in a company’s capital structure, in terms of priority to corporate income, and therefore will be subject to greater credit risk than payments on debt securities. Unlike interest payments on debt securities, preferred stock dividends are payable only if declared by the issuer’s board of directors. Preferred stock also may be subject to optional or mandatory redemption provisions.

 

Portfolio Turnover Risk. A fund that trades aggressively will experience high portfolio turnover and relatively high brokerage and other transaction costs. Such transaction costs may lower a fund’s effective investment return.
May Lose Money rr_RiskLoseMoney You may lose money by investing in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The information below provides an illustration of how the Fund’s performance has varied over time. The bar chart and table provide some indication of the risks of investing in the Fund by showing the changes in the Fund’s investment performance from year to year during the periods indicated and by showing how the average annual total returns for the one-, five- and ten-year periods compare with a broad-based securities market index. The total return figures do not reflect expenses that apply to the separate account or related annuity contracts. The inclusion of these charges would reduce the total return figures for all periods shown. The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The information below provides an illustration of how the Fund’s performance has varied over time.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Calendar Year Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 15.12% (quarter ended 9/30/09) and the lowest return for a quarter was (22.46)% (quarter ended 12/31/08).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.12%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.46%)
Performance Table: rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2013)
Wilshire VIT Equity Fund | S&P 500 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 32.39%
5 Years rr_AverageAnnualReturnYear05 17.94%
10 Years rr_AverageAnnualReturnYear10 7.40%
Wilshire VIT Equity Fund | Wilshire VIT Equity Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol HORMX
Management Fees rr_ManagementFeesOverAssets 0.23% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [1]
Other Expenses rr_OtherExpensesOverAssets 0.23% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.69% [1],[2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.40% [1]
Expense Example, 1 YEAR rr_ExpenseExampleYear01 $ 143
Expense Example, 3 YEARS rr_ExpenseExampleYear03 443
Expense Example, 5 YEARS rr_ExpenseExampleYear05 766
Expense Example, 10 YEARS rr_ExpenseExampleYear10 1,680
2004 rr_AnnualReturn2004 10.15%
2005 rr_AnnualReturn2005 5.90%
2006 rr_AnnualReturn2006 16.92%
2007 rr_AnnualReturn2007 2.20%
2008 rr_AnnualReturn2008 (40.19%)
2009 rr_AnnualReturn2009 23.57%
2010 rr_AnnualReturn2010 11.58%
2011 rr_AnnualReturn2011 (2.87%)
2012 rr_AnnualReturn2012 14.66%
2013 rr_AnnualReturn2013 30.36%
1 Year rr_AverageAnnualReturnYear01 30.36%
5 Years rr_AverageAnnualReturnYear05 14.89%
10 Years rr_AverageAnnualReturnYear10 5.25%
Wilshire VIT Balanced Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return rr_RiskReturnHeading

Balanced Fund
Investment objective: rr_ObjectiveHeading

Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Balanced Fund (the “Fund”) seeks to realize a high long-term total rate of return consistent with prudent investment risks. Total rate of return consists of current income, which includes dividends, interest, discount accruals and capital appreciation.
Fees and expenses of the fund: rr_ExpenseHeading

Fees and Expenses of the Fund
Fees and expenses of the fund, narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. The table below does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher.
Annual fund operating expenses, heading rr_OperatingExpensesCaption

Annual Fund Operating Expenses* (expenses that you pay each year as a percentage of the value of your investment):
Portfolio turnover, heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio turnover, narrative 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. 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 151% of the average value of its portfolio.
Portfolio Turnover Rate rr_PortfolioTurnoverRate 151.00%
Acquired Fund Fees and Expenses, Based on Estimates rr_AcquiredFundFeesAndExpensesBasedOnEstimates Acquired Fund Fees and Expenses are estimated based upon the Fund’s current allocations to underlying fund investments.
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

Example: This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The example does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Strategy, Narrative rr_StrategyNarrativeTextBlock

The Fund will invest in underlying affiliated funds (the “Underlying Funds”) and may invest in direct investments, including but not limited to exchange-traded products (“ETPs”), which include both exchange-traded funds and exchange-traded notes.

 

Underlying Funds include mutual funds advised by Wilshire Associates, Inc., the Fund's investment adviser (the “Adviser”), and currently include the Income Fund, the Large Company Growth Portfolio, the Large Company Value Portfolio, the Small Company Growth Portfolio, the Small Company Value Portfolio and the Wilshire International Equity Fund. Under normal circumstances, the Fund’s target asset mix is 65% equity securities and 35% fixed income securities, with a range of 50% to 75% in equity securities and a range of 25% to 50% in fixed income securities.

 

Under normal market conditions, the Fund invests in a diversified portfolio of global debt and equity securities of which at least 40% of the Fund’s net assets will be invested in non-U.S. investments and in at least three different countries. The Fund normally invests at least 25% of its assets in fixed income securities and at least 25% of its assets in equity securities. The Fund seeks income by investing in a combination of corporate, agency and government bonds and other debt securities of any maturity issued in numerous countries, including emerging markets countries. The Fund may also invest in high-yield bonds rated below investment grade credit quality. The Fund seeks capital appreciation by investing in equity securities of companies from a variety of industries located anywhere in the world, including emerging markets.

 

The following describes the types of securities in which the Income Fund is permitted to invest:

 

Principal Investment Strategies

 

The Income Fund invests, under normal circumstances, at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in fixed income securities. These securities are primarily investment grade fixed income securities, including government and corporate securities, mortgage and asset-backed securities, which are generally pass-through securities.

 

The Income Fund invests at least 75% of its total assets in:

 

• investment grade, publicly offered debt securities, including mortgage-backed and other asset-backed securities (within the four highest ratings as determined by Moody’s Investors Service (“Moody’s”), Standard & Poor’s (“S&P”) or an equivalent rating at the time of purchase)

 

• securities issued or guaranteed by the U.S. government or its agencies, including obligations issued or guaranteed by U.S., local, city and state government and agencies

 

• high quality commercial paper (within the two highest grades as determined by both Moody’s and S&P or an equivalent rating), certificates of deposit, bankers’ acceptances, repurchase and reverse repurchase agreements, time deposits with maturities less than seven days and cash or cash equivalents

 

• high grade U.S. dollar-denominated debt obligations of foreign governments, foreign corporations, foreign branches of U.S. banks and foreign banks (limited to the four highest ratings as determined by Moody’s, S&P or an equivalent rating at the time of purchase and to 15% of the Fund’s total assets)

 

• highest quality non-U.S. dollar-denominated debt obligations of foreign issuers (limited to the four highest ratings as determined by Moody’s, S&P or an equivalent rating at the time of purchase) and do not exceed 20% of the Fund’s total assets and up to 10% of the Income Fund’s total assets may be invested in non-U.S. denominated investments via foreign currency transactions and unhedged foreign currency denominated bonds.

 

Generally, the average duration of the U.S. portion of the Income Fund will range within 25% of the Barclays U.S. Aggregate Bond Index’s duration. There are no maximum maturity limits on individual securities. For defensive purposes, the duration and maturity of the Income Fund may be shortened. The Income Fund will maintain a high grade average quality for the portfolio (third highest rating as determined by Moody’s, S&P or an equivalent rating).

 

Up to 25% of the Income Fund’s total assets may be invested in securities not described above, including preferred stock, convertible securities, securities carrying warrants to purchase equity securities, U.S. dollar denominated and non-U.S. dollar denominated debt obligations of U.S. and non-U.S. issuers, including emerging market issuers, rated below BBB (by Moody’s, S&P or an equivalent rating) and derivatives.

 

The following describes the types of securities in which the Large Company Growth Portfolio is permitted to invest:

 

• The Large Company Growth Portfolio focuses on the large company growth segment of the U.S. equity market.

 

• The Large Company Growth Portfolio invests substantially all of its assets in common stock of companies with large market capitalizations—generally greater than $10 billion at the time of purchase.

 

• The Large Company Growth Portfolio invests in companies that historically have above average earnings or sales growth and retention of earnings, often such companies have above average price to earnings ratios.

 

• The Large Company Growth Portfolio uses a multi-manager strategy with multiple subadvisers who employ different strategies.

 

The following describes the types of securities in which the Large Company Value Portfolio is permitted to invest:

 

• The Large Company Value Portfolio focuses on the large company value segment of the U.S. equity market.

 

• The Large Company Value Portfolio invests substantially all of its assets in the common stock companies with large market capitalizations—generally greater than $10 billion at the time of purchase.

 

• The Large Company Value Portfolio invests, generally, in companies with relatively low price to book value ratios, low price to earnings ratios and higher than average dividend yields (which means that their prices are low relative to the size of their dividends).

 

• The Large Company Value Portfolio uses a multi-manager strategy with multiple subadvisers who employ different strategies.

 

The following describes the types of securities in which the Small Company Growth Portfolio is permitted to invest:

 

• The Small Company Growth Portfolio focuses on the small company growth segment of the U.S. equity market.

 

• The Small Company Growth Portfolio invests substantially all of its assets in the common stock of companies with smaller market capitalizations—which is generally less than $3 billion at the time of purchase.

 

• The Small Company Growth Portfolio invests in companies that historically have above average earnings or sales growth and retention of earnings, often such companies have above average price to earnings ratios.

 

• The Small Company Growth Portfolio invests in small-cap companies that may still further develop.

 

• The Small Company Growth Portfolio uses a multi-manager strategy with multiple subadvisers who employ different strategies.

 

The following describes the types of securities in which the Small Company Value Portfolio is permitted to invest:

 

• The Small Company Value Portfolio focuses on the small company value segment of the U.S. equity market.

 

• The Small Company Value Portfolio invests substantially all of its assets in the common stock of companies with smaller market capitalizations—which is generally less than $3 billion at the time of purchase.

 

• The Small Company Value Portfolio invests, generally, in companies with relatively low price to book value ratios, low price to earnings ratios and relatively high dividend yields.

 

• The Small Company Value Portfolio invests in small-cap companies that may still further develop.

 

• The Small Company Value Portfolio uses a multi-manager strategy with multiple subadvisers who employ different strategies.

 

The following describes the types of securities in which the Wilshire International Equity Fund is permitted to invest:

 

The Wilshire International Equity Fund invests, under normal circumstances, at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities. The Wilshire International Equity Fund invests in companies organized outside the United States. Since the Wilshire International Equity Fund invests in companies of any size, it may at times invest in small-cap companies. The Wilshire International Equity Fund intends to diversify investments among several countries and to have represented in its holdings business activities in not less than three different countries. The Wilshire International Equity Fund invests primarily in equity securities of established companies that the subadvisers believe have favorable characteristics and that are listed on foreign exchanges. The Wilshire International Equity Fund may invest up to 35% of its net assets in emerging market securities, including ETFs. The Wilshire International Equity Fund may also invest in fixed-income securities of foreign governments and companies. The Wilshire International Equity Fund uses a multi-manager strategy with subadvisers who may employ different strategies.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

You may lose money by investing in the Fund. By investing in the Fund, an investor also assumes the same types of risks, either directly, or indirectly, as investing in the Income Fund, the Large Company Growth Portfolio, the Large Company Value Portfolio, the Small Company Growth Portfolio, the Small Company Value Portfolio and the Wilshire International Equity Fund. Investing in the Fund involves the following principal risks:

 

Asset Allocation Risk. Although asset allocation among different asset categories and investment strategies generally reduces risk and exposure to any one category or strategy, the risk remains that the Adviser may favor an asset category or investment strategy that performs poorly relative to other asset categories and investment strategies.

 

Equity Risk. The principal risk of investing in the Large Company Growth Portfolio, the Large Company Value Portfolio, the Small Company Growth Portfolio, the Small Company Value Portfolio and the Wilshire International Equity Fund is equity risk. This is the risk that the prices of stocks held by the Fund will change due to general market and economic conditions, perceptions regarding the industries in which the companies participate, and each company’s particular circumstances. Equity investments, including common stocks, tend to be more volatile than bonds and money market instruments. The value of the Fund’s shares will go up and down due to movement in the collective returns of the individual securities held by Fund. Because common stocks are subordinate to preferred stocks in a company’s capital structure, in a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

 

Credit Risk. For debt securities, credit risk is the possibility that an issuer or counterparty to a contract will fail to make timely payments of interest or principal to a fund. The credit risk of the Income Fund depends on the credit quality of its underlying securities. In general, for debt securities, the lower the credit quality of a fund’s securities, the higher a fund’s risk, all other factors such as maturity being equal.

 

Interest Rate Risk. For debt securities, interest rate risk is the possibility that the price will fall because of changing interest rates. In general, debt securities’ prices rise or fall inversely to changes in interest rates. If interest rates rise, bond prices generally fall; if interest rates fall, bond prices generally rise. In addition, for a given change in interest rates, longer-maturity bonds fluctuate more in price (gaining or losing more in value) than shorter-maturity bonds. There may be less governmental intervention in the securities markets in the near future. If so, it could cause an increase in interest rates, which would have a negative impact on fixed income securities and could negatively affect a fund's net asset value.

 

Prepayment Risk. Mortgage-backed securities are subject to the risk of unanticipated prepayments of principal with respect to mortgages in the security’s underlying pool of assets. While principal prepayments are passed through to the holders of the securities, prepayments also reduce the future payments on such securities and may reduce their value. Mortgage-backed securities are subject to the risk that an unexpected rise in interest rates will extend the life of a mortgage-backed security beyond the expected prepayment time, typically reducing the security’s value. Mortgage-backed securities are subject to the risk that an unexpected decline in interest rates will contract the life of a mortgage-backed security, thereby affecting its prepayment schedule, which may affect the value of the security.

 

Reinvestment Risk. During periods of falling interest rates, a debt security with a high stated interest rate may be prepaid (or “called”) prior to its expected maturity date. If, during periods of falling interest rates, a debt security with a high stated interest rate is called, the unanticipated proceeds would likely be invested at lower interest rates, and a fund’s income or yield may decline. Call provisions, which may lead to reinvestment risk, are most common for intermediate- and long-term municipal, corporate and mortgage-backed securities. To the extent securities subject to call were acquired at a premium, the potential for appreciation in the event of a decline in interest rates may be limited and may even result in losses.

 

Recent Market Events Risk. Over the past several years, the global financial crisis has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets.

 

Governmental and non-governmental issuers (notably in Europe) have defaulted on, or been forced to restructure their debts; and many other issuers have faced difficulties obtaining credit or refinancing existing obligations. These market conditions may continue, worsen or spread, including in the United States, Europe and elsewhere. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as reduce the value and liquidity of certain securities.

 

This environment could make identifying investment risks and opportunities especially difficult for a subadviser, and whether or not a fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of a fund’s investments may be negatively affected. In addition, policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

 

Portfolio Turnover Risk. A fund that trades aggressively will experience high portfolio turnover and relatively high brokerage and other transaction costs. Such transaction costs may lower a fund’s effective investment return.

 

Portfolio Strategy Risk. The investment performance of a fund is in part dependent upon a subadviser’s skill in making appropriate investments. To the extent that a fund’s investments differ from the portfolio represented by the benchmark, there exists the potential for volatility of the return of a fund relative to its index. As the industry and sector composition of the market or index changes over time, the implementation of a fund’s strategy can lead to substantial differences in the sector or industry allocation of a fund relative to the market or index.

 

Liquidity Risk. A fund may invest in certain securities that may be difficult or impossible to sell at a certain time and at a price that the Fund finds to be favorable. A fund may have to accept an unfavorable price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on portfolio management or investment performance.

 

Currency Risk. Non U.S. dollar-denominated securities are subject to fluctuations in the exchange rates between the U.S. dollar and foreign currencies which may negatively affect an investment. Adverse changes in exchange rates may erode or reverse any gains produced by foreign currency denominated investments, and may widen any losses.

 

Derivatives Risk. When a fund uses derivatives (securities whose value is based upon the value of another security or an index) to hedge positions in the portfolio, any loss generated by the derivative security should be substantially offset by gains on the hedged investment and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. To the extent that a derivative is not used as a hedge (i.e., for speculation), a fund is directly exposed to the potential gains and losses of that derivative. Gains and losses from non hedging derivative positions may be substantially greater than the derivative’s original cost. To the extent a fund uses derivatives, a fund will (to the extent required by applicable law) either segregate cash or liquid assets in the prescribed amounts or “cover” its future obligations under the transaction, such as by holding an offsetting investment.

 

Valuation Risk. A fund may invest in securities that are difficult to value and may inadvertently value certain of its securities at a higher price than the market will bear.

 

Foreign Investment Risk. Foreign investments often involve risks such as political instability, differences in financial reporting standards and less stringent regulation of securities markets. These risks are magnified in less-established, emerging markets.

 

Style Risk. The risk of investing in the Large Company Growth Portfolio, the Large Company Value Portfolio, the Small Company Growth Portfolio and the Small Company Value Portfolio is the risk that the portfolios’ growth or value styles will perform poorly or fall out of favor with investors. For example, at times the market may favor large capitalization stocks over small capitalization stocks, value stocks over growth stocks, or vice versa.

 

Multi-Managed Fund Risk. The Income Fund, the Large Company Growth Portfolio, the Large Company Value Portfolio, the Small Company Growth Portfolio, the Small Company Value Portfolio and the Wilshire International Equity Fund are multi-managed funds with multiple subadvisers who employ different strategies. As a result, the Income Fund, the Large Company Growth Portfolio, the Large Company Value Portfolio, the Small Company Growth Portfolio, the Small Company Value Portfolio and the Wilshire International Equity Fund may have buy and sell transactions in the same security on the same day.

 

ETF Risk. ETFs involve certain inherent risks generally associated with investments in a portfolio of common stocks, including the risk that the general level of stock prices may decline, thereby adversely affecting the value of each unit of the ETF. Moreover, an ETF may not fully replicate the performance of its benchmark index because of the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of stocks held. Investing in ETFs, which are investment companies, involves duplication of advisory fees and certain other expenses.

 

Emerging Market Risk. Foreign investment risk may be particularly high to the extent the Wilshire International Equity Fund invests in securities of issuers based in countries with developing economies (i.e., emerging markets). These securities may present market, credit, currency, liquidity, legal, political and other risks different from, or greater than, the risks of investing in developed foreign (non-U.S.) countries.

 

Small Cap Risk. Small-cap companies may lack the management experience, financial resources, product diversity and competitive strengths of larger companies, and may be traded less frequently. These companies may be in the developmental stage or may be older companies undergoing significant changes. Small-cap companies may also be subject to greater business risks and more sensitive to changes in economic conditions than larger more established companies. As a result, the prices of small-cap companies may rise and fall more sharply than larger capitalized companies.

 

Market Risk. For equity securities, stock market movements may affect a fund's share price on a daily basis. Declines in value are possible because of declines in the stock market in general or because of a decline in the specific securities held by a fund. There is also the possibility that the price of the security will fall because the market perceives that there is or will be a deterioration in the fundamental value of the issuer or poor earnings performance by the issuer. Market risk may affect a single company, industry, sector or the market as a whole. For debt securities, the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole.

 

Large-Cap Company Risk. Larger, more established companies may be unable to attain the high growth rates of successful, smaller companies during periods of economic expansion.
May Lose Money rr_RiskLoseMoney You may lose money by investing in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The information below provides an illustration of how the Fund’s performance has varied over time. The bar chart and table provide some indication of the risks of investing in the Fund by showing the changes in the Fund’s investment performance from year to year during the periods indicated and by showing how the average annual total returns for the one-, five- and ten-year periods compare with a broad-based securities market index and additional indexes with characteristics relevant to the Fund. The total return figures do not reflect expenses that apply to the separate account or related annuity contracts. The inclusion of these charges would reduce the total return figures for all periods shown. The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The information below provides an illustration of how the Fund’s performance has varied over time
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Calendar Year Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 11.23% (quarter ended 9/30/09) and the lowest return for a quarter was (12.16)% (quarter ended 12/31/08).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.23%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.16%)
Performance Table: rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2013)
Wilshire VIT Balanced Fund | S&P 500 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 32.39%
5 Years rr_AverageAnnualReturnYear05 17.94%
10 Years rr_AverageAnnualReturnYear10 7.40%
Wilshire VIT Balanced Fund | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.02%)
5 Years rr_AverageAnnualReturnYear05 4.44%
10 Years rr_AverageAnnualReturnYear10 4.55%
Wilshire VIT Balanced Fund | MSCI EAFE Index (reflects no deductions for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.78%
5 Years rr_AverageAnnualReturnYear05 12.44%
10 Years rr_AverageAnnualReturnYear10 6.91%
Wilshire VIT Balanced Fund | Stock/Bond Composite (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.02% [3]
5 Years rr_AverageAnnualReturnYear05 12.63% [3]
10 Years rr_AverageAnnualReturnYear10 6.65% [3]
Wilshire VIT Balanced Fund | Wilshire VIT Balanced Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets none [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.16% [4]
Other Expenses rr_OtherExpensesOverAssets 0.18% [4]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 1.16% [4],[5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.50% [4]
Expense Example, 1 YEAR rr_ExpenseExampleYear01 153
Expense Example, 3 YEARS rr_ExpenseExampleYear03 474
Expense Example, 5 YEARS rr_ExpenseExampleYear05 818
Expense Example, 10 YEARS rr_ExpenseExampleYear10 1,791
2004 rr_AnnualReturn2004 8.19%
2005 rr_AnnualReturn2005 4.29%
2006 rr_AnnualReturn2006 11.59%
2007 rr_AnnualReturn2007 3.08%
2008 rr_AnnualReturn2008 (26.68%)
2009 rr_AnnualReturn2009 18.03%
2010 rr_AnnualReturn2010 10.92%
2011 rr_AnnualReturn2011 (0.65%)
2012 rr_AnnualReturn2012 12.11%
2013 rr_AnnualReturn2013 18.31%
1 Year rr_AverageAnnualReturnYear01 18.31%
5 Years rr_AverageAnnualReturnYear05 11.52%
10 Years rr_AverageAnnualReturnYear10 5.08%
Wilshire VIT Income Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return rr_RiskReturnHeading

Income Fund
Investment objective: rr_ObjectiveHeading

Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Income Fund (the “Fund”) seeks to achieve a long-term total rate of return in excess of the U.S. bond market over a full market cycle.
Fees and expenses of the fund: rr_ExpenseHeading

Fees and Expenses of the Fund
Fees and expenses of the fund, narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. The table below does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher.
Annual fund operating expenses, heading rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment):
Portfolio turnover, heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio turnover, narrative 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. 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 330% of the average value of its portfolio.
Portfolio Turnover Rate rr_PortfolioTurnoverRate 330.00%
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

Example: This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The example does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Strategy, Narrative rr_StrategyNarrativeTextBlock

The Income Fund invests, under normal circumstances, at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in fixed income securities. These securities are primarily investment grade fixed income securities, including government and corporate securities, mortgage and asset-backed securities, which are generally pass-through securities.

 

The Income Fund invests at least 75% of its total assets in:

 

• investment grade, publicly offered debt securities, including mortgage-backed and other asset-backed securities (within the four highest ratings as determined by Moody’s Investors Service (“Moody’s”), Standard & Poor’s (“S&P”) or an equivalent rating at the time of purchase)

 

• securities issued or guaranteed by the U.S. government or its agencies, including obligations issued or guaranteed by U.S., local, city and state government and agencies

 

• high quality commercial paper (within the two highest grades as determined by both Moody’s and S&P or an equivalent rating), certificates of deposit, bankers’ acceptances, repurchase and reverse repurchase agreements, time deposits with maturities less than seven days and cash or cash equivalents

 

• high grade U.S. dollar-denominated debt obligations of foreign governments, foreign corporations, foreign branches of U.S. banks and foreign banks (limited to the four highest ratings as determined by Moody’s, S&P or an equivalent rating at the time of purchase and to 15% of the Fund’s total assets)

 

• highest quality non-U.S. dollar-denominated debt obligations of foreign issuers (limited to the four highest ratings as determined by Moody’s, S&P or an equivalent rating at the time of purchase) and do not exceed 20% of the Fund’s total assets and up to 10% of the Income Fund’s total assets may be invested in non-U.S. denominated investments via foreign currency transactions and unhedged foreign currency denominated bonds.

 

Generally, the average duration of the U.S. portion of the Income Fund will range within 25% of the Barclays U.S. Aggregate Bond Index’s duration. There are no maximum maturity limits on individual securities. For defensive purposes, the duration and maturity of the Income Fund may be shortened. The Income Fund will maintain a high grade average quality for the portfolio (third highest rating as determined by Moody’s, S&P or an equivalent rating).

 

Up to 25% of the Income Fund’s total assets may be invested in securities not described above, including preferred stock, convertible securities, securities carrying warrants to purchase equity securities, U.S. dollar denominated and non-U.S. dollar denominated debt obligations of U.S. and non-U.S. issuers, including emerging market issuers, rated below BBB (by Moody’s, S&P or an equivalent rating) and derivatives.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

You may lose money by investing in the Fund. In addition, investing in the Fund involves the following principal risks:

 

Credit Risk. For debt securities, credit risk is the possibility that an issuer or counterparty to a contract will fail to make timely payments of interest or principal to a fund. The credit risk of the Fund depends on the credit quality of its underlying securities. In general, for debt securities, the lower the credit quality of a fund’s securities, the higher a fund’s risk, all other factors such as maturity being equal.

 

Interest Rate Risk. For debt securities, interest rate risk is the possibility that the price will fall because of changing interest rates. In general, debt securities’ prices rise or fall inversely to changes in interest rates. If interest rates rise, bond prices generally fall; if interest rates fall, bond prices generally rise. In addition, for a given change in interest rates, longer-maturity bonds fluctuate more in price (gaining or losing more in value) than shorter-maturity bonds. There may be less governmental intervention in the securities markets in the near future. If so, it could cause an increase in interest rates, which would have a negative impact on fixed income securities and could negatively affect the Fund’s net asset value.

 

Market Risk. For debt securities, market risk is the risk that the fixed income markets may become volatile and less liquid, and the market value of an investment may move up or down, sometimes quickly or unpredictably.

 

Prepayment Risk. Mortgage-backed securities are subject to the risk of unanticipated prepayments of principal with respect to mortgages in the security’s underlying pool of assets. While principal prepayments are passed through to the holders of the securities, prepayments also reduce the future payments on such securities and may reduce their value. Mortgage-backed securities are subject to the risk that an unexpected rise in interest rates will extend the life of a mortgage-backed security beyond the expected prepayment time, typically reducing the

 

security’s value. Mortgage-backed securities are subject to the risk that an unexpected decline in interest rates will contract the life of a mortgage-backed security, thereby affecting its prepayment schedule, which may affect the value of the security.

 

Reinvestment Risk. During periods of falling interest rates, a debt security with a high stated interest rate may be prepaid (or “called”) prior to its expected maturity date. If, during periods of falling interest rates, a debt security with a high stated interest rate is called, the unanticipated proceeds would likely be invested at lower interest rates, and a fund’s income or yield may decline. Call provisions, which may lead to reinvestment risk, are most common for intermediate- and long-term municipal, corporate and mortgage-backed securities. To the extent securities subject to call were acquired at a premium, the potential for appreciation in the event of a decline in interest rates may be limited and may even result in losses.

 

Portfolio Turnover Risk. A fund that trades aggressively will experience high portfolio turnover and relatively high brokerage and other transaction costs. Such transaction costs may lower a fund’s effective investment return.

 

Portfolio Strategy Risk. The investment performance of the Fund is in part dependent upon a subadviser’s skill in making appropriate investments. To the extent that a fund’s investments differ from the portfolio represented by the benchmark, there exists the potential for volatility of the return of a fund relative to its index. As the industry and sector composition of the market or index changes over time, the implementation of a fund’s strategy can lead to substantial differences in the sector or industry allocation of a fund relative to the market or index.

 

Liquidity Risk. The Fund may invest in certain securities that may be difficult or impossible to sell at a certain time and at a price that the Fund finds to be favorable. The Fund may have to accept an unfavorable price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on portfolio management or investment performance.

 

Currency Risk. Non U.S. dollar-denominated securities are subject to fluctuations in the exchange rates between the U.S. dollar and foreign currencies which may negatively affect an investment. Adverse changes in exchange rates may erode or reverse any gains produced by foreign currency denominated investments, and may widen any losses.

 

Derivatives Risk. When a fund uses derivatives (securities whose value is based upon the value of another security or an index) to hedge positions in the portfolio, any loss generated by the derivative security should be substantially offset by gains on the hedged investment and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. To the extent that a derivative is not used as a hedge (i.e., for speculation), a fund is directly exposed to the potential gains and losses of that derivative. Gains and losses from non hedging derivative positions may be substantially greater than the derivative’s original cost. To the extent a fund uses derivatives, a fund will (to the extent required by applicable law) either segregate cash or liquid assets in the prescribed amounts or “cover” its future obligations under the transaction, such as by holding an offsetting investment.

 

Valuation Risk. A fund may invest in securities that are difficult to value and may inadvertently value certain of its securities at a higher price than the market will bear.

 

Foreign Investment Risk. Foreign investments often involve risks such as political instability, differences in financial reporting standards and less stringent regulation of securities markets. These risks are magnified in less-established, emerging markets.

 

Recent Market Events Risk. Over the past several years, the global financial crisis has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets.

 

Governmental and non-governmental issuers (notably in Europe) have defaulted on, or been forced to restructure their debts; and many other issuers have faced difficulties obtaining credit or refinancing existing obligations. These market conditions may continue, worsen or spread, including in the United States, Europe and elsewhere. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as reduce the value and liquidity of certain securities.

 

Certain Wilshire funds are permitted to invest in the Fund. As a result, the Fund may have large inflows or outflows of cash from time to time. This could have adverse effects on the Fund’s performance if the Fund were required to sell securities or invest cash at times when it otherwise would not do so. This activity could also accelerate the realization of capital gains and increase the Fund’s transaction costs.
May Lose Money rr_RiskLoseMoney You may lose money by investing in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The information below provides an illustration of how the Fund’s performance has varied over time. The bar chart and table provide some indication of the risks of investing in the Fund by showing the changes in the Fund’s investment performance from year to year during the periods indicated and by showing how the average annual total returns for the one-, five- and ten-year periods compare with a broad-based securities market index. The total return figures do not reflect expenses that apply to the separate account or related annuity contracts. The inclusion of these charges would reduce the total return figures for all periods shown. The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The information below provides an illustration of how the Fund’s performance has varied over time.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Calendar Year Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 6.35% (quarter ended 9/30/09) and the lowest return for a quarter was (4.48)% (quarter ended 9/30/08).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.35%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.48%)
Performance Table: rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2013)
Wilshire VIT Income Fund | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.02%)
5 Years rr_AverageAnnualReturnYear05 4.44%
10 Years rr_AverageAnnualReturnYear10 4.55%
Wilshire VIT Income Fund | Wilshire VIT Income Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.42%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.24%
Expense Example, 1 YEAR rr_ExpenseExampleYear01 126
Expense Example, 3 YEARS rr_ExpenseExampleYear03 393
Expense Example, 5 YEARS rr_ExpenseExampleYear05 681
Expense Example, 10 YEARS rr_ExpenseExampleYear10 1,500
2004 rr_AnnualReturn2004 4.94%
2005 rr_AnnualReturn2005 1.97%
2006 rr_AnnualReturn2006 3.99%
2007 rr_AnnualReturn2007 4.21%
2008 rr_AnnualReturn2008 (6.44%)
2009 rr_AnnualReturn2009 13.29%
2010 rr_AnnualReturn2010 9.11%
2011 rr_AnnualReturn2011 6.92%
2012 rr_AnnualReturn2012 7.31%
2013 rr_AnnualReturn2013 (2.16%)
1 Year rr_AverageAnnualReturnYear01 (2.16%)
5 Years rr_AverageAnnualReturnYear05 6.77%
10 Years rr_AverageAnnualReturnYear10 4.18%
Wilshire VIT Small Cap Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return rr_RiskReturnHeading

Small Cap Fund
Investment objective: rr_ObjectiveHeading

Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Small Cap Fund (the “Fund”) seeks long-term capital appreciation.
Fees and expenses of the fund: rr_ExpenseHeading

Fees and Expenses of the Fund
Fees and expenses of the fund, narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. The table below does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher.
Annual fund operating expenses, heading rr_OperatingExpensesCaption

Annual Fund Operating Expenses* (expenses that you pay each year as a percentage of the value of your investment):
Date Of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2015-04-30
Portfolio turnover, heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio turnover, narrative 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. 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 257% of the average value of its portfolio.
Portfolio Turnover Rate rr_PortfolioTurnoverRate 257.00%
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

Example: This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes one year of waived fees, that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The example does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Strategy, Narrative rr_StrategyNarrativeTextBlock

The Fund invests, under normal circumstances, at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in securities of small cap companies. Small cap companies are companies with smaller market capitalizations, which are generally less than $3 billion at the time of purchase. The Fund ordinarily invests in the small cap companies and in other affiliated investment companies, including the Small Company Growth Portfolio and the Small Company Value Portfolio. As a matter of investment policy, the Fund expects to invest 0% to 50% of its assets in the Small Company Value Portfolio and 0% to 50% of its assets in the Small Company Growth Portfolio, but no more than 70% in both funds on a combined basis.

 

The Fund uses a multi-manager strategy with subadvisers who may employ different strategies. Los Angeles Capital Management and Equity Research, Inc. (“Los Angeles Capital”) and Ranger Investment Management, L.P. (“Ranger”) each manage a portion of the Fund’s portfolio.

 

For the Small Company Growth Portfolio, the following describes the types of securities in which the Small Company Growth Portfolio is permitted to invest:

 

• The Small Company Growth Portfolio focuses on the small company growth segment of the U.S. equity market.

 

• The Small Company Growth Portfolio invests substantially all of its assets in the common stock of companies with smaller market capitalizations—which is generally less than $3 billion at the time of purchase.

 

• The Small Company Growth Portfolio invests in companies that historically have above average earnings or sales growth and retention of earnings, often such companies have above average price to earnings ratios.

 

• The Small Company Growth Portfolio invests in small-cap companies that may still further develop.

 

• The Small Company Growth Portfolio uses a multi-manager strategy with multiple subadvisers who employ different strategies.

 

For the Small Company Value Portfolio, the following describes the types of securities in which the Small Company Value Portfolio is permitted to invest:

 

• The Small Company Value Portfolio focuses on the small company value segment of the U.S. equity market.

 

• The Small Company Value Portfolio invests substantially all of its assets in the common stock of companies with smaller market capitalizations—which is generally less than $3 billion at the time of purchase.

 

• The Small Company Value Portfolio invests, generally, in companies with relatively low price to book value ratios, low price to earnings ratios and relatively high dividend yields.

 

• The Portfolio invests in small-cap companies that may still further develop.

 

• The Portfolio uses a multi-manager strategy with multiple subadvisers who employ different strategies.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

You may lose money by investing in the Fund. By investing in the Fund, an investor also assumes the same types of risks, either directly, or indirectly, as investing in the Small Company Growth Portfolio and the Small Company Value Portfolio. Investing in the Fund involves the following principal risks:

 

Small Cap Risk. Small-cap companies may lack the management experience, financial resources, product diversity and competitive strengths of larger companies, and may be traded less frequently. These companies may be in the developmental stage or may be older companies undergoing significant changes. Small-cap companies may also be subject to greater business risks and more sensitive to changes in economic conditions than larger more established companies. As a result, the prices of small-cap companies may rise and fall more sharply.

 

Style Risk. The risk of investing in the Small Company Growth Portfolio and the Small Company Value Portfolio is the risk that the portfolios’ growth or value styles will perform poorly or fall out of favor with investors. For example, at times the market may favor large capitalization stocks over small capitalization stocks, value stocks over growth stocks, or vice versa.

 

Equity Risk. A principal risk of investing in the Fund, the Small Company Growth Portfolio and the Small Company Value Portfolio is equity risk. This is the risk that the prices of stocks held by the Fund, the Small Company Growth Portfolio and the Small Company Value Portfolio will change due to general market and economic conditions, perceptions regarding the industries in which the companies participate, and each company’s particular circumstances. Equity investments, including common stocks, tend to be more volatile than bonds and money market instruments. The value of the Fund’s shares will go up and down due to movement in the collective returns of the individual securities held by the Fund. Because common stocks are subordinate to preferred stocks in a company’s capital structure, in a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

 

ETF Risk. ETFs in which the Fund may invest involve certain inherent risks generally associated with investments in a portfolio of common stocks, including the risk that the general level of stock prices may decline, thereby adversely affecting the value of each unit of the ETF. Moreover, an ETF may not fully replicate the performance of its benchmark index because of the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of stocks held. Investing in ETFs, which are investment companies, involve duplication of advisory fees and certain other expenses.

 

Investment Style Risk. During certain market conditions, a fund with a more specific investment style (such as value or growth) may perform less well than a fund that allows greater flexibility in the investment of assets.

 

Market Risk. For equity securities, stock market movements will affect the Fund’s, the Small Company Growth Portfolio’s and the Small Company Value Portfolio’s share price on a daily basis. Declines in value are possible because of declines in the stock market in general or because of a decline in the specific securities held by the Fund, the Small Company Growth Portfolio and the Small Company Value Portfolio. There is also the possibility that the price of a security will fall because the market perceives that there is or will be a deterioration in the fundamental value of the issuer or poor earnings performance by the issuer. Market risk may affect a single company, industry, sector or the market as a whole. For debt securities, the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole.

 

Recent Market Events Risk. Over the past several years, the global financial crisis has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets.

 

Governmental and non-governmental issuers (notably in Europe) have defaulted on, or been forced to restructure their debts; and many other issuers have faced difficulties obtaining credit or refinancing existing obligations. These market conditions may continue, worsen or spread, including in the United States, Europe and elsewhere. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as reduce the value and liquidity of certain securities.

 

Portfolio Strategy Risk. The investment performance of the Fund is in part dependent upon a subadviser’s skill in making appropriate investments. To the extent that the Fund’s investments differ from the portfolio represented by the benchmark, there exists the potential for volatility of the return of the Fund relative to its index. As the industry and sector composition of the market or index changes over time, the implementation of the Fund’s strategy can lead to substantial differences in the sector or industry allocation of the Fund relative to the market or index.

 

Portfolio Turnover Risk. A fund that trades aggressively will experience high portfolio turnover and relatively high brokerage and other transaction costs. Such transaction costs may lower a fund’s effective investment return.

 

Multi-Managed Fund Risk. The Small Cap Fund, the Small Company Growth Portfolio and the Small Company Value Portfolio are multi-managed funds with multiple subadvisers who employ different strategies. As a result, the Small Cap Fund, the Small Company Growth Portfolio and the Small Company Value Portfolio may have buy and sell transactions in the same security on the same day.

 

Asset Allocation Risk. Although asset allocation among different asset categories and investment strategies generally reduces risk and exposure to any one category or strategy, the risk remains that the Adviser may favor an asset category or investment strategy that performs poorly relative to other asset categories and investment strategies.
May Lose Money rr_RiskLoseMoney You may lose money by investing in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The information below provides an illustration of how the Fund’s performance has varied over time. The bar chart and table provide some indication of the risks of investing in the Fund by showing the changes in the Fund’s investment performance from year to year during the periods indicated and by showing how the average annual total returns for the one-, five- and ten-year periods compare with a broad-based securities market index. The total return figures do not reflect expenses that apply to the separate account or related annuity contracts. The inclusion of these charges would reduce the total return figures for all periods shown. The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The information below provides an illustration of how the Fund’s performance has varied over time.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Calendar Year Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 19.32% (quarter ended 6/30/09) and the lowest return for a quarter was (27.01)% (quarter ended 12/31/08).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.32%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (27.01%)
Performance Table: rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2013)
Wilshire VIT Small Cap Fund | Russell 2000 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 38.82%
5 Years rr_AverageAnnualReturnYear05 20.08%
10 Years rr_AverageAnnualReturnYear10 9.07%
Wilshire VIT Small Cap Fund | Wilshire VIT Small Cap Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.40% [6]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [6]
Other Expenses rr_OtherExpensesOverAssets 0.25% [6]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.79% [6],[7]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.69% [6]
Less Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.20%) [6],[8]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.49% [6]
Expense Example, 1 YEAR rr_ExpenseExampleYear01 152
Expense Example, 3 YEARS rr_ExpenseExampleYear03 513
Expense Example, 5 YEARS rr_ExpenseExampleYear05 899
Expense Example, 10 YEARS rr_ExpenseExampleYear10 1,981
2004 rr_AnnualReturn2004 4.40%
2005 rr_AnnualReturn2005 3.65%
2006 rr_AnnualReturn2006 11.42%
2007 rr_AnnualReturn2007 13.90%
2008 rr_AnnualReturn2008 (46.36%)
2009 rr_AnnualReturn2009 28.39%
2010 rr_AnnualReturn2010 26.23%
2011 rr_AnnualReturn2011 (0.64%)
2012 rr_AnnualReturn2012 6.85%
2013 rr_AnnualReturn2013 40.28%
1 Year rr_AverageAnnualReturnYear01 40.28%
5 Years rr_AverageAnnualReturnYear05 19.27%
10 Years rr_AverageAnnualReturnYear10 5.92%
Wilshire VIT International Equity Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return rr_RiskReturnHeading

International Equity Fund
Investment objective: rr_ObjectiveHeading

Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The International Equity Fund (the “Fund”) seeks long-term growth of capital primarily through diversified holdings of marketable foreign equity investments.
Fees and expenses of the fund: rr_ExpenseHeading

Fees and Expenses of the Fund
Fees and expenses of the fund, narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. The table below does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher.
Annual fund operating expenses, heading rr_OperatingExpensesCaption

Annual Fund Operating Expenses* (expenses that you pay each year as a percentage of the value of your investment):
Date Of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2015-04-30
Portfolio turnover, heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio turnover, narrative 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. 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 194% of the average value of its portfolio.
Portfolio Turnover Rate rr_PortfolioTurnoverRate 194.00%
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

Example: This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes one year of waived fees, that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The example does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Strategy, Narrative rr_StrategyNarrativeTextBlock

The Fund invests, under normal circumstances, at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities. The Fund invests in companies, wherever organized, which do business primarily outside the United States and in other affiliated international companies, including the Wilshire International Equity Fund. As a matter of investment policy, the Fund expects to invest 0% to 55% of its assets in the Wilshire International Equity Fund. The Fund intends to diversify its investments in operating companies among several countries and to have represented in its holdings business activities in not less than three different countries. The operating companies in which the Fund primarily invests are equity securities of established companies that the subadvisers believe have favorable characteristics and that are listed on foreign exchanges. The Fund may invest up to 35% of its net assets in emerging market securities, including ETFs. The Fund may also invest in fixed-income securities of foreign governments and companies.

 

The Fund uses a multi-manager strategy with subadvisers who may employ different strategies. Thomas White International Ltd. (“Thomas White”) and WCM Investment Management (“WCM”) each manage a portion of the Fund’s portfolio. Thomas White employs a value strategy with respect to its portion of the Fund. WCM’s international equity strategy employs a bottom-up approach that seeks to identify companies with attractive fundamentals, such as long-term growth in revenue and earnings, and show a strong probability for superior future growth.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

You may lose money by investing in the Fund. By investing in the Fund, an investor also assumes the same types of risks, either directly, or indirectly, as investing in the Wilshire International Equity Fund. Investing in the Fund involves the following principal risks:

 

Foreign Investment Risk. Foreign investments often involve risks such as political instability, differences in financial reporting standards and less stringent regulation of securities markets.

 

Emerging Market Risk. Foreign investment risk may be particularly high to the extent the Fund or the Wilshire International Equity Fund invests in securities of issuers based in countries with developing economies (i.e., emerging markets). These securities may present market, credit, currency, liquidity, legal, political and other risks different from, or greater than, the risks of investing in developed foreign (non-U.S.) countries.

 

Equity Risk. A principal risk of investing in the Fund and the Wilshire International Equity Fund is equity risk. This is the risk that the prices of stocks held by the Fund and the Wilshire International Equity Fund will change due to general market and economic conditions, perceptions regarding the industries in which the companies participate, and each company’s particular circumstances. Equity investments, including common stocks, tend to be more volatile than bonds and money market instruments. The value of the Fund’s shares will go up and down due to movement in the collective returns of the individual securities held by the Fund. Because common stocks are subordinate to preferred stocks in a company’s capital structure, in a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

 

ETF Risk. ETFs in which the Fund and the Wilshire International Equity Fund may invest involve certain inherent risks generally associated with investments in a portfolio of common stocks, including the risk that the general level of stock prices may decline, thereby adversely affecting the value of each unit of the ETF. Moreover, an ETF may not fully replicate the performance of its benchmark index because of the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weightings of securities of the number of stocks held. Investing in ETFs, which are investment companies, may involve duplication of advisory fees and certain other expenses.

 

Currency Risk. Non-U.S. dollar-denominated securities are subject to fluctuations in the exchange rates between the U.S. dollar and foreign currencies which may negatively affect an investment. Adverse changes in exchange rates may erode or reverse any gains produced by foreign currency denominated investments, and may widen any losses.

 

Small Cap Risk. Small-cap companies may lack the management experience, financial resources, product diversity and competitive strengths of larger companies, and may be traded less frequently. These companies may be in the developmental stage or may be older companies undergoing significant changes. Small-cap companies may also be subject to greater business risks and more sensitive to changes in economic conditions than larger more established companies. As a result, the prices of small-cap companies may rise and fall more sharply.

 

Large-Cap Company Risk. Larger, more established companies may be unable to attain the high growth rates of successful, smaller companies during periods of economic expansion.

 

Market Risk. For equity securities, stock market movements will affect the Fund’s or the Wilshire International Equity Fund’s share price on a daily basis. Declines in value are possible because of declines in the stock market in general or because of a decline in the specific securities held by the Wilshire International Equity Fund. There is also the possibility that the price of the security will fall because the market perceives that there is or will be a deterioration in the fundamental value of the issuer or poor earnings performance by the issuer. Market risk may affect a single company, industry, sector or the market as a whole. For debt securities, the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole.

 

Recent Market Events Risk. Over the past several years, the global financial crisis has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets.

 

Governmental and non-governmental issuers (notably in Europe) have defaulted on, or been forced to restructure their debts; and many other issuers have faced difficulties obtaining credit or refinancing existing obligations. These market conditions may continue, worsen or spread, including in the United States, Europe and elsewhere. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as reduce the value and liquidity of certain securities.

 

This environment could make identifying investment risks and opportunities especially difficult for a subadviser, and whether or not a fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of a fund’s investments may be negatively affected. In addition, policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

 

Portfolio Strategy Risk. The investment performance of the Fund and the Wilshire International Equity Fund is in part dependent upon a subadviser’s skill in making appropriate investments. To the extent that the Fund’s and the Wilshire International Equity Fund’s investments differ from the portfolio represented by the benchmark, there exists the potential for volatility of the return of the Fund relative to its index. As the industry and sector composition of the market or index changes over time, the implementation of the Fund’s and the Wilshire International Equity Fund’s strategy can lead to substantial differences in the sector or industry allocation of the Fund relative to the market or index.

 

Multi-Managed Fund Risk. The Fund and the Wilshire International Equity Fund are multi-managed funds with multiple subadvisers who employ different strategies. As a result, the Fund and the Wilshire International Equity Fund may have buy and sell transactions in the same security on the same day.

 

Asset Allocation Risk. Although asset allocation among different asset categories and investment strategies generally reduces risk and exposure to any one category or strategy, the risk remains that the Adviser may favor an asset category or investment strategy that performs poorly relative to other asset categories and investment strategies.

 

Investment Style Risk. During certain market conditions, a fund with a more specific investment style (such as value or growth) may perform less well than a fund that allows greater flexibility in the investment of assets.

 

Portfolio Turnover Risk. The Fund and the Wilshire International Equity Fund may experience high rates of portfolio turnover, which results in above average transaction costs and the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes.

 

Certain Wilshire funds are permitted to invest in the Fund. As a result, the Fund may have large inflows or outflows of cash from time to time. This could have adverse effects on the Fund’s performance if the Fund were required to sell securities or invest cash at times when it otherwise would not do so. This activity could also accelerate the realization of capital gains and increase the Fund’s transaction costs.
May Lose Money rr_RiskLoseMoney You may lose money by investing in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The information below provides an illustration of how the Fund’s performance has varied over time. The bar chart and table provide some indication of the risks of investing in the Fund by showing the changes in the Fund’s investment performance from year to year during the periods indicated and by showing how the average annual total returns for the one-, five- and ten-year periods compare with a broad-based securities market index. The total return figures do not reflect expenses that apply to the separate account or related annuity contracts. The inclusion of these charges would reduce the total return figures for all periods shown. The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The information below provides an illustration of how the Fund’s performance has varied over time.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Calendar Year Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 24.58% (quarter ended 6/30/09) and the lowest return for a quarter was (21.43)% (quarter ended 9/30/11).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 24.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.43%)
Performance Table: rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2013)
Wilshire VIT International Equity Fund | MSCI EAFE Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.78%
5 Years rr_AverageAnnualReturnYear05 12.44%
10 Years rr_AverageAnnualReturnYear10 6.91%
Wilshire VIT International Equity Fund | Wilshire VIT International Equity Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.49% [9]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [9]
Other Expenses rr_OtherExpensesOverAssets 0.49% [9]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66% [7],[9]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.89% [9]
Less Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.20%) [10],[9]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.69% [9]
Expense Example, 1 YEAR rr_ExpenseExampleYear01 172
Expense Example, 3 YEARS rr_ExpenseExampleYear03 575
Expense Example, 5 YEARS rr_ExpenseExampleYear05 1,003
Expense Example, 10 YEARS rr_ExpenseExampleYear10 2,195
2004 rr_AnnualReturn2004 10.61%
2005 rr_AnnualReturn2005 10.12%
2006 rr_AnnualReturn2006 23.76%
2007 rr_AnnualReturn2007 8.73%
2008 rr_AnnualReturn2008 (43.75%)
2009 rr_AnnualReturn2009 31.02%
2010 rr_AnnualReturn2010 10.04%
2011 rr_AnnualReturn2011 (13.74%)
2012 rr_AnnualReturn2012 18.33%
2013 rr_AnnualReturn2013 13.12%
1 Year rr_AverageAnnualReturnYear01 13.12%
5 Years rr_AverageAnnualReturnYear05 10.73%
10 Years rr_AverageAnnualReturnYear10 4.38%
Wilshire VIT Socially Responsible Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return rr_RiskReturnHeading

Socially Responsible Fund
Investment objective: rr_ObjectiveHeading

Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Socially Responsible Fund (the “Fund”) seeks long-term growth of capital, current income and growth of income.
Fees and expenses of the fund: rr_ExpenseHeading

Fees and Expenses of the Fund
Fees and expenses of the fund, narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. The table below does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher.
Annual fund operating expenses, heading rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Portfolio turnover, heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio turnover, narrative 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. 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 21% of the average value of its portfolio.
Portfolio Turnover Rate rr_PortfolioTurnoverRate 21.00%
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

Example: This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The example does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Strategy, Narrative rr_StrategyNarrativeTextBlock

The Fund pursues its objective through a diversified portfolio composed primarily of marketable equity securities (including common stocks, preferred stocks and debt securities convertible into common stocks of seasoned U.S.-traded companies). The Fund seeks to achieve its objective by investing in issuers that meet certain investment and socially responsible criteria. Investments in equity securities are limited to issuers which, in the subadviser’s judgment, meet the following criteria:

 

Socially responsible areas of focus for inclusion:

 

• Companies with strong environmental management systems, eco-efficiency programs, health and safety procedures, and an overall commitment to continuously improve on environmental matters

 

• Companies with competitive employee benefit initiatives, workplace programs and non-discrimination policies

 

• Companies with good transparency and shareholder engagement

 

Socially responsible areas of exclusion based on revenues:

 

• Major tobacco, alcohol and gaming device manufacturers

 

• Major weapons manufacturers

 

• Major nuclear power generators

 

• Major pornographic content manufacturers

 

The Adviser allocates the Fund’s assets between two investment strategies: an appreciation strategy and a large cap core strategy.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

You may lose money by investing in the Fund. In addition, investing in the Fund involves the following principal risks:

 

Socially Responsible Risk. The Fund only invests in companies that meet its criteria for socially responsible investing. Because of this restriction, the investments that the subadviser may choose from may be more limited than those of a fund that is not restricted to investing in companies that meet social criteria. As a result, the subadviser may pass up opportunities to buy certain securities when it is otherwise advantageous to do so or may sell certain securities when it is disadvantageous to do so. In addition, investing in socially responsible companies may result in the Fund investing more or less in a specific sector of the economy relative to its benchmark.

 

Equity Risk. A principal risk of investing in the Fund is equity risk. This is the risk that the prices of stocks held by the Fund will change due to general market and economic conditions, perceptions regarding the industries in which the companies participate, and each company’s particular circumstances. Equity investments, including common stocks, tend to be more volatile than bonds and money market instruments. The value of the Fund’s shares will go up and down due to movement in the collective returns of the individual securities held by the Fund. Because common stocks are subordinate to preferred stocks in a company’s capital structure, in a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

 

Market Risk. For equity securities, stock market movements will affect the Fund’s share price on a daily basis. Declines in value are possible because of declines in the stock market in general or because of a decline in the specific securities held by the Fund. There is also the possibility that the price of the security will fall because the market perceives that there is or will be a deterioration in the fundamental value of the issuer or poor earnings performance by the issuer. Market risk may affect a single company, industry, sector or the market as a whole. For debt securities, the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole.

 

Recent Market Events Risk. Over the past several years, the global financial crisis has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets.

 

Governmental and non-governmental issuers (notably in Europe) have defaulted on, or been forced to restructure their debts; and many other issuers have faced difficulties obtaining credit or refinancing existing obligations. These market conditions may continue, worsen or spread, including in the United States, Europe and elsewhere. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as reduce the value and liquidity of certain securities.

 

Portfolio Strategy Risk. The investment performance of the Fund is in part dependent upon the subadviser’s skill in making appropriate investments. To the extent that the Fund’s investments differ from the portfolio represented by the benchmark, there exists the potential for volatility of the return of the Fund relative to its index. As the industry and sector composition of the market or index changes over time, the implementation of the Fund’s strategy can lead to substantial differences in the sector or industry allocation of the Fund relative to the market or index.

 

Preferred Stock Risk. Preferred stocks are typically subordinated to bonds and other debt instruments in a company’s capital structure, in terms of priority to corporate income, and therefore will be subject to greater credit risk than payments on debt securities. Unlike interest payments on debt securities, preferred stock dividends are payable only if declared by the issuer’s board of directors. Preferred stock also may be subject to optional or mandatory redemption provisions.

 

Convertible Securities Risk. Convertible securities are fixed income securities that may be converted at a stated price within a specific period of time into a certain quantity of common stock of the same or a different issuer. As with all fixed income securities, the market values of convertible securities tend to decline as interest rates increase and increase as interest rates declines. Convertible securities are senior to common stocks in an issuer’s capital structure, but are usually subordinated to similar non-convertible securities.
May Lose Money rr_RiskLoseMoney You may lose money by investing in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The information below provides an illustration of how the Fund’s performance has varied over time. The bar chart and table provide some indication of the risks of investing in the Fund by showing the changes in the Fund’s investment performance from year to year during the periods indicated and by showing how the average annual total returns for the one-, five- and ten-year periods compare with a broad-based securities market index. The total return figures do not reflect expenses that apply to the separate account or related annuity contracts. The inclusion of these charges would reduce the total return figures for all periods shown. The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The information below provides an illustration of how the Fund’s performance has varied over time.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Calendar Year Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 15.30% (quarter ended 6/30/09) and the lowest return for a quarter was (23.64)% (quarter ended 12/31/08).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.30%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.64%)
Performance Table: rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2013)
Wilshire VIT Socially Responsible Fund | S&P 500 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 32.39%
5 Years rr_AverageAnnualReturnYear05 17.94%
10 Years rr_AverageAnnualReturnYear10 7.40%
Wilshire VIT Socially Responsible Fund | Wilshire VIT Socially Responsible Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.33%
Expense Example, 1 YEAR rr_ExpenseExampleYear01 135
Expense Example, 3 YEARS rr_ExpenseExampleYear03 421
Expense Example, 5 YEARS rr_ExpenseExampleYear05 729
Expense Example, 10 YEARS rr_ExpenseExampleYear10 1,601
2004 rr_AnnualReturn2004 13.30%
2005 rr_AnnualReturn2005 5.13%
2006 rr_AnnualReturn2006 20.52%
2007 rr_AnnualReturn2007 (2.63%)
2008 rr_AnnualReturn2008 (40.39%)
2009 rr_AnnualReturn2009 21.51%
2010 rr_AnnualReturn2010 11.76%
2011 rr_AnnualReturn2011 (1.45%)
2012 rr_AnnualReturn2012 15.61%
2013 rr_AnnualReturn2013 29.01%
1 Year rr_AverageAnnualReturnYear01 29.01%
5 Years rr_AverageAnnualReturnYear05 14.82%
10 Years rr_AverageAnnualReturnYear10 5.22%
Wilshire 2015 ETF Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return rr_RiskReturnHeading

Wilshire 2015 ETF Fund
Investment objective: rr_ObjectiveHeading

Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Wilshire 2015 ETF Fund’s (“2015 ETF Fund” or “Fund”) investment objective is to provide high total return until its target retirement date. Thereafter the 2015 ETF Fund’s objective will be to seek high current income and,
Secondary objectives rr_ObjectiveSecondaryTextBlock

as a secondary objective, capital appreciation.
Fees and expenses of the fund: rr_ExpenseHeading

Fees and Expenses of the 2015 ETF Fund
Fees and expenses of the fund, narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the 2015 ETF Fund. The table below does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher.
Annual fund operating expenses, heading rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Date Of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2015-04-30
Portfolio turnover, heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio turnover, narrative rr_PortfolioTurnoverTextBlock

The 2015 ETF Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). These costs, which are not reflected in annual fund operating expenses or in the example, affect the 2015 ETF Fund’s performance. During the most recent fiscal year, the 2015 ETF Fund’s portfolio turnover rate was 23% of the average value of its portfolio.
Portfolio Turnover Rate rr_PortfolioTurnoverRate 23.00%
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

Example: This example is intended to help you compare the cost of investing in the 2015 ETF Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes one year of capped expenses, that your investment has a 5% return each year and that the 2015 ETF Fund’s operating expenses remain the same. The example does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Strategy, Narrative rr_StrategyNarrativeTextBlock

The 2015 ETF Fund operates under a fund of funds structure. The 2015 ETF Fund seeks to achieve its investment objective by investing primarily in a portfolio of unaffiliated exchange traded funds (“ETFs”), which are funds traded on national securities exchanges with listed securities, in accordance with weightings determined by Wilshire Associates Incorporated (“Wilshire”). The ETFs, in turn, in an attempt to approximate the investment performance of their respective benchmarks, invest in a variety of U.S. and foreign equity, debt, commodities, money market securities, futures and other instruments in accordance with their own investment policies and strategies.

 

In managing the 2015 ETF Fund, Wilshire focuses on four key principles: asset allocation, portfolio structure, investment time horizon and fund management. Asset allocation across appropriate asset classes is the central theme of Wilshire’s investment philosophy. The 2015 ETF Fund invests in the ETFs according to a moderate asset allocation strategy designed for investors planning to retire in 2015, plus or minus two to three years. Wilshire seeks to reduce risk by investing in ETFs that are diversified within each asset class. The amounts invested in each of the ETFs will vary from time to time depending on the investment time horizon and Wilshire’s assessment of business, economic and market conditions, including any potential advantage of price shifts between the equity markets and the fixed income markets. The 2015 ETF Fund’s asset allocation will become more conservative over time. In general, however, Wilshire does not anticipate making frequent changes in asset allocation and will not attempt to time the market. As of the date of this Prospectus, the target asset allocation for the 2015 ETF Fund is 49% invested in ETFs which invest in fixed income securities and 51% invested in ETFs which invest in equity securities. Approximately 15 years after 2015, the 2015 ETF Fund’s target asset allocation will be approximately 73% invested in ETFs which invest in fixed income securities and 27% in ETFs which invest in equity securities.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

You may lose money by investing in the 2015 ETF Fund. In addition, by investing in the Fund, an investor assumes the same types of risks, either directly or indirectly, as investing in the ETFs. For the 2015 ETF Fund, the risks are as follows:

 

ETF Risk. ETFs in which the 2015 ETF Fund may invest involve certain inherent risks generally associated with investments in a portfolio of common stocks, including the risk that the general level of stock prices may decline, thereby adversely affecting the value of each unit of the ETF. Moreover, an ETF may not fully replicate the performance of its benchmark index because of the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of stocks held. Investing in ETFs, which are investment companies, involve duplication of advisory fees and certain other expenses.

 

Fund of Funds Risk. The Fund invests in ETFs. Shareholders of the Fund bear their proportionate share of the ETFs’ fees and expenses, as well as their share of the Fund’s fees and expenses. As a result, your cost of investing will be higher than the cost of investing directly in ETFs and may be higher than mutual funds that invest directly in stocks and bonds. Also, the Fund may be prevented from fully allocating assets to certain ETFs due to fund of funds investment limitations.

 

Future Developments. An ETF may take advantage of other investment practices that are not currently contemplated for use by ETFs, or are not available but may yet be developed, to the extent such investment practices are consistent with an ETF’s investment objective and legally permissible for the ETF. Such investment practices, if they arise, may involve risks that exceed those involved in the activities described above.

 

Market Risk. For equity securities, stock market movements will affect an ETF’s share price on a daily basis. Declines in value are possible because of declines in the stock market in general or because of a decline in the specific securities held by an ETF. There is also the possibility that the price of the security will fall because the market perceives that there is or will be a deterioration in the fundamental value of the issuer or poor earnings performance by the issuer. Market risk may affect a single company, industry, sector or the market as a whole. For debt securities, the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole.

 

Recent Market Events Risk. Over the past several years, the global financial crisis has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets.

 

Governmental and non-governmental issuers (notably in Europe) have defaulted on, or been forced to restructure their debts; and many other issuers have faced difficulties obtaining credit or refinancing existing obligations. These market conditions may continue, worsen or spread, including in the United States, Europe and elsewhere. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as reduce the value and liquidity of certain securities.

 

Portfolio Strategy Risk. The performance of an ETF is in part dependent upon an ETF’s investment adviser’s skill in making appropriate investments. To the extent that an ETF’s investments differ from the portfolio represented by the benchmark, there exists the potential for volatility of the return of the ETF relative to its index. As the industry and sector composition of the market or index changes over time, the implementation of an ETF’s strategy can lead to substantial differences in the sector or industry allocation of the ETF relative to the market or index.

 

Capitalization Risk. This is the risk of investments in small-capitalization companies. Investments in small-cap companies tend to be more volatile than investments in large-cap companies. An ETF’s investments in smaller capitalization companies may have additional risks because these companies often have limited product lines, markets or financial resources. This risk is greater for those ETFs with higher asset allocations to small-cap equities.

 

Credit Risk. For debt securities, credit risk is the possibility that an issuer or counterparty to a contract will fail to make timely payments of interest or principal to an ETF. The credit risk of an ETF depends on the credit quality of its underlying securities. In general, for debt securities, the lower the credit quality of an ETF’s securities, the higher the ETF’s risk, all other factors such as maturity being equal.

 

Currency Risk. Non-U.S. dollar-denominated securities are subject to fluctuations in the exchange rates between the U.S. dollar and foreign currencies which may negatively affect an investment. Adverse changes in exchange rates may erode or reverse any gains produced by foreign currency denominated investments, and may widen any losses.

 

Derivatives Risk. When an ETF uses derivatives (securities whose value is based upon the value of another security or an index) to hedge positions in the portfolio, any loss generated by the derivative security should be substantially offset by gains on the hedged investment and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. To the extent that a derivative is not used as a hedge (i.e., for speculation), an ETF is directly exposed to the potential gains and losses of that derivative. Gains and losses from non-hedging derivative positions may be substantially greater than the derivative’s original cost.

 

Equity Securities Risk. Equity investments, including common stocks, tend to be more volatile than bonds or money market instruments. To the extent an ETF is invested in equity securities, the value of the ETF’s shares will go up and down due to movement in the collective returns of the individual securities held by the ETF. Common stocks are subordinate to preferred stocks in a company’s capital structure, and if a company is liquidated, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of those who own common stocks.

 

Emerging Market Risk. Foreign investment risk may be particularly high to the extent an ETF invests in emerging market securities of issuers based in countries with developing economies. These securities may present market, credit, currency, liquidity, legal, political and other risks different from, or greater than, the risks of investing in developed foreign (non-U.S.) countries.

 

Foreign (Non-U.S.) Risk. An ETF’s investments in securities of non-U.S. issuers may experience more rapid and extreme changes in value than investments in securities of U.S. companies. The securities markets of many non-U.S. countries are relatively small, with a limited number of companies typically representing a small number of industries. Non-U.S. issuers usually are not subject to the same degree of regulation as U.S. issuers. Reporting, accounting and auditing standards of non-U.S. countries differ, in some cases significantly, from U.S. standards. Nationalization, expropriation or confiscatory taxation, currency blockage, or political changes or diplomatic developments could adversely affect an ETF’s investments in a country other than the United States. To the extent an ETF invests in a particular country or geographic region, the ETF may have more significant risk due to market changes or other factors affecting that country or region, including political instability and unpredictable economic conditions. This risk is greater for those ETFs with higher asset allocations to non-U.S. equities.

 

Inflation Risk. This is the risk that the value of assets or income from an ETF’s investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the ETF’s assets can decline as can the value of distributions.

 

Interest Rate Risk. For debt securities, interest rate risk is the possibility that the price will fall because of changing interest rates. In general, debt security prices move inversely to changes in interest rates. If interest rates rise, bond prices generally fall; if interest rates fall, bond prices generally rise. In addition, for a given change in interest rates, longer-maturity bonds fluctuate more in price (gaining or losing more in value) than shorter-maturity bonds.

 

Investment Style Risk. During certain market conditions, an ETF with a more specific investment style (such as value or growth) may perform less well than an ETF that allows greater flexibility in the investment of assets.

 

Liquidity Risk. An ETF may invest in certain securities that may be difficult or impossible to sell at a certain time and at a price that the ETF finds to be favorable. An ETF may have to accept an unfavorable price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on portfolio management or investment performance.

 

Prepayment Risk. Mortgage-backed securities are subject to the risk of unanticipated prepayments of principal with respect to mortgages in the security’s underlying pool of assets. While principal prepayments are passed through to the holders of the securities, prepayments also reduce the future payments on such securities and may reduce their value. Mortgage-backed securities are subject to the risk that an unexpected rise in interest rates will extend the life of a mortgage-backed security beyond the expected prepayment time, typically reducing the security’s value. Mortgage-backed securities are subject to the risk that an unexpected decline in interest rates will contract the life of a mortgage-backed security, thereby affecting its prepayment schedule, which may affect the value of the security.

 

Real Estate Investment Trust (“REIT”) Risk. REITs are subject to a variety of factors affecting the real estate market generally, such as economic conditions, overbuilding, mortgage rates and availability. In addition, REITs have additional risks because REITs are dependent on the capability of their managers, may have limited diversification, and could be significantly affected by changes in tax laws.

 

Reinvestment Risk. During periods of falling interest rates, a debt security with a high stated interest rate may be prepaid (or “called”) prior to its expected maturity date. If, during periods of falling interest rates, a debt security with a high stated interest rate is called, the unanticipated proceeds would likely be invested at lower interest rates, and an ETF’s income or yield may decline. Call provisions, which may lead to reinvestment risk, are most common for intermediate- and long-term municipal, corporate and mortgage-backed securities. To the extent securities subject to call were acquired at a premium, the potential for appreciation in the event of a decline in interest rates may be limited and may even result in losses.
May Lose Money rr_RiskLoseMoney You may lose money by investing in the 2015 ETF Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The information below provides an illustration of how the 2015 ETF Fund’s performance has varied over time. The bar chart and table provide some indication of the risks of investing in the 2015 ETF Fund by showing the changes in the 2015 ETF Fund’s investment performance from year to year during the periods indicated and by showing how the average annual total returns for the one-, five-year and since inception periods compare with a broad-based securities market index and an additional index with characteristics relevant to the Fund. The total return figures do not reflect expenses that apply to the separate account or related annuity contracts. The inclusion of these charges would reduce the total return figures for all periods shown. The 2015 ETF Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The information below provides an illustration of how the 2015 ETF Fund’s performance has varied over time.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The 2015 ETF Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Calendar Year Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 12.34% (quarter ended 9/30/09) and the lowest return for a quarter was (11.00)% (quarter ended 12/31/08).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.34%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.00%)
Performance Table: rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2013)
Wilshire 2015 ETF Fund | Wilshire 5000 IndexSM (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 33.09%
5 Years rr_AverageAnnualReturnYear05 18.59%
Since Inception rr_AverageAnnualReturnSinceInception 7.06%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
Wilshire 2015 ETF Fund | S&P Target Date 2015 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.16%
5 Years rr_AverageAnnualReturnYear05 10.54%
Since Inception rr_AverageAnnualReturnSinceInception 5.26%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
Wilshire 2015 ETF Fund | Wilshire 2015 ETF Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.14%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.88%
Less Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.14%) [11]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 0.74%
Expense Example, 1 YEAR rr_ExpenseExampleYear01 76
Expense Example, 3 YEARS rr_ExpenseExampleYear03 267
Expense Example, 5 YEARS rr_ExpenseExampleYear05 474
Expense Example, 10 YEARS rr_ExpenseExampleYear10 1,071
2007 rr_AnnualReturn2007 4.57%
2008 rr_AnnualReturn2008 (24.18%)
2009 rr_AnnualReturn2009 20.49%
2010 rr_AnnualReturn2010 11.41%
2011 rr_AnnualReturn2011 1.56%
2012 rr_AnnualReturn2012 12.48%
2013 rr_AnnualReturn2013 10.38%
1 Year rr_AverageAnnualReturnYear01 10.38%
5 Years rr_AverageAnnualReturnYear05 11.10%
Since Inception rr_AverageAnnualReturnSinceInception 4.63%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
Wilshire 2025 ETF Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return rr_RiskReturnHeading

Wilshire 2025 ETF Fund
Investment objective: rr_ObjectiveHeading

Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Wilshire 2025 ETF Fund’s (“2025 ETF Fund” or “Fund”) investment objective is to provide high total return until its target retirement date. Thereafter the 2025 ETF Fund’s objective will be to seek high current income and,
Secondary objectives rr_ObjectiveSecondaryTextBlock

as a secondary objective, capital appreciation.
Fees and expenses of the fund: rr_ExpenseHeading

Fees and Expenses of the 2025 ETF Fund
Fees and expenses of the fund, narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the 2025 ETF Fund. The table below does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher.
Annual fund operating expenses, heading rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Date Of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2015-04-30
Portfolio turnover, heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio turnover, narrative rr_PortfolioTurnoverTextBlock

The 2025 ETF Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). These costs, which are not reflected in annual fund operating expenses or in the example, affect the 2025 ETF Fund’s performance. During the most recent fiscal year, the 2025 ETF Fund’s portfolio turnover rate was 12% of the average value of its portfolio.
Portfolio Turnover Rate rr_PortfolioTurnoverRate 12.00%
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

Example: This example is intended to help you compare the cost of investing in the 2025 ETF Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes one year of capped expenses, that your investment has a 5% return each year and that the 2025 ETF Fund’s operating expenses remain the same. The example does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Strategy, Narrative rr_StrategyNarrativeTextBlock

The 2025 ETF Fund operates under a fund of funds structure. The 2025 ETF Fund seeks to achieve its investment objective by investing primarily in a portfolio of unaffiliated exchange traded funds (“ETFs”), which are funds traded on national securities exchanges with listed securities, in accordance with weightings determined by Wilshire Associates Incorporated (“Wilshire”). The ETFs, in turn, in an attempt to approximate the investment performance of their respective benchmarks, invest in a variety of U.S. and foreign equity, debt, commodities, money market securities, futures and other instruments in accordance with their own investment policies and strategies.

 

In managing the 2025 ETF Fund, Wilshire focuses on four key principles: asset allocation, portfolio structure, investment time horizon and fund management. Asset allocation across appropriate asset classes is the central theme of Wilshire’s investment philosophy. The 2025 ETF Fund invests in the ETFs according to a moderate asset allocation strategy designed for investors planning to retire in 2025, plus or minus two to three years. Wilshire seeks to reduce risk by investing in ETFs that are diversified within each asset class. The amounts invested in each of the ETFs will vary from time to time depending on the investment time horizon and Wilshire’s assessment of business, economic and market conditions, including any potential advantage of price shifts between the equity markets and the fixed income markets. The 2025 ETF Fund’s asset allocation will become more conservative over time. In general, however, Wilshire does not anticipate making frequent changes in asset allocation and will not attempt to time the market. As of the date of this Prospectus, the target asset allocation for the 2025 ETF Fund is 38% invested in ETFs which invest in fixed income securities and 62% invested in ETFs which invest in equity securities. Approximately 15 years after 2025, the 2025 ETF Fund’s target asset allocation will be approximately 73% invested in ETFs which invest in fixed income securities and 27% in ETFs which invest in equity securities.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

You may lose money by investing in the 2025 ETF Fund. In addition, by investing in the Fund, an investor assumes the same types of risks, either directly or indirectly, as investing in the ETFs. For the 2025 ETF Fund, the risks are as follows:

 

ETF Risk. ETFs in which the 2025 ETF Fund may invest involve certain inherent risks generally associated with investments in a portfolio of common stocks, including the risk that the general level of stock prices may decline, thereby adversely affecting the value of each unit of the ETF. Moreover, an ETF may not fully replicate the performance of its benchmark index because of the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of stocks held. Investing in ETFs, which are investment companies, involve duplication of advisory fees and certain other expenses.

 

Fund of Funds Risk. The Fund invests in ETFs. Shareholders of the Fund bear their proportionate share of the ETFs’ fees and expenses, as well as their share of the Fund’s fees and expenses. As a result, your cost of investing will be higher than the cost of investing directly in ETFs and may be higher than mutual funds that invest directly in stocks and bonds. Also, the Fund may be prevented from fully allocating assets to certain ETFs due to fund of funds investment limitations.

 

Future Developments. An ETF may take advantage of other investment practices that are not currently contemplated for use by ETFs, or are not available but may yet be developed, to the extent such investment practices are consistent with an ETF’s investment objective and legally permissible for the ETF. Such investment practices, if they arise, may involve risks that exceed those involved in the activities described above.

 

Market Risk. For equity securities, stock market movements will affect an ETF’s share price on a daily basis. Declines in value are possible because of declines in the stock market in general or because of a decline in the specific securities held by an ETF. There is also the possibility that the price of the security will fall because the market perceives that there is or will be a deterioration in the fundamental value of the issuer or poor earnings performance by the issuer. Market risk may affect a single company, industry, sector or the market as a whole. For debt securities, the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole.

 

Recent Market Events Risk. Over the past several years, the global financial crisis has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets.

 

Governmental and non-governmental issuers (notably in Europe) have defaulted on, or been forced to restructure their debts; and many other issuers have faced difficulties obtaining credit or refinancing existing obligations. These market conditions may continue, worsen or spread, including in the United States, Europe and elsewhere. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as reduce the value and liquidity of certain securities.

 

Portfolio Strategy Risk. The performance of an ETF is in part dependent upon an ETF’s investment adviser’s skill in making appropriate investments. To the extent that an ETF’s investments differ from the portfolio represented by the benchmark, there exists the potential for volatility of the return of the ETF relative to its index. As the industry and sector composition of the market or index changes over time, the implementation of an ETF’s strategy can lead to substantial differences in the sector or industry allocation of the ETF relative to the market or index.

 

Capitalization Risk. This is the risk of investments in small-capitalization companies. Investments in small-cap companies tend to be more volatile than investments in large-cap companies. An ETF’s investments in smaller capitalization companies may have additional risks because these companies often have limited product lines, markets or financial resources. This risk is greater for those ETFs with higher asset allocations to small-cap equities.

 

Credit Risk. For debt securities, credit risk is the possibility that an issuer or counterparty to a contract will fail to make timely payments of interest or principal to an ETF. The credit risk of an ETF depends on the credit quality of its underlying securities. In general, for debt securities, the lower the credit quality of an ETF’s securities, the higher the ETF’s risk, all other factors such as maturity being equal.

 

Currency Risk. Non-U.S. dollar-denominated securities are subject to fluctuations in the exchange rates between the U.S. dollar and foreign currencies which may negatively affect an investment. Adverse changes in exchange rates may erode or reverse any gains produced by foreign currency denominated investments, and may widen any losses.

 

Derivatives Risk. When an ETF uses derivatives (securities whose value is based upon the value of another security or an index) to hedge positions in the portfolio, any loss generated by the derivative security should be substantially offset by gains on the hedged investment and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. To the extent that a derivative is not used as a hedge (i.e., for speculation), an ETF is directly exposed to the potential gains and losses of that derivative. Gains and losses from non-hedging derivative positions may be substantially greater than the derivative’s original cost. To the extent that an ETF uses derivatives, an ETF will (to the extent required by applicable law) either(1) segregate cash or liquid assets in the prescribed amount or (2) otherwise “cover” its future obligations under the transaction, such as by holding an offsetting investment.

 

Equity Securities Risk. Equity investments, including common stocks, tend to be more volatile than bonds or money market instruments. To the extent an ETF is invested in equity securities, the value of the ETF’s shares will go up and down due to movement in the collective returns of the individual securities held by the

 

ETF. Common stocks are subordinate to preferred stocks in a company’s capital structure, and if a company is liquidated, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of those who own common stocks.

 

Emerging Market Risk. Foreign investment risk may be particularly high to the extent an ETF invests in emerging market securities of issuers based in countries with developing economies. These securities may present market, credit, currency, liquidity, legal, political and other risks different from, or greater than, the risks of investing in developed foreign (non-U.S.) countries.

 

Foreign (Non-U.S.) Risk. An ETF’s investments in securities of non-U.S. issuers may experience more rapid and extreme changes in value than investments in securities of U.S. companies. The securities markets of many non-U.S. countries are relatively small, with a limited number of companies typically representing a small number of industries. Non-U.S. issuers usually are not subject to the same degree of regulation as U.S. issuers. Reporting, accounting and auditing standards of non-U.S. countries differ, in some cases significantly, from U.S. standards. Nationalization, expropriation or confiscatory taxation, currency blockage, or political changes or diplomatic developments could adversely affect an ETF’s investments in a country other than the United States. To the extent an ETF invests in a particular country or geographic region, the ETF may have more significant risk due to market changes or other factors affecting that country or region, including political instability and unpredictable economic conditions. This risk is greater for those ETFs with higher asset allocations to non-U.S. equities.

 

Inflation Risk. This is the risk that the value of assets or income from an ETF’s investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the ETF’s assets can decline as can the value of distributions.

 

Interest Rate Risk. For debt securities, interest rate risk is the possibility that the price will fall because of changing interest rates. In general, debt security prices move inversely to changes in interest rates. If interest rates rise, bond prices generally fall; if interest rates fall, bond prices generally rise. In addition, for a given change in interest rates, longer-maturity bonds fluctuate more in price (gaining or losing more in value) than shorter-maturity bonds.

 

Investment Style Risk. During certain market conditions, an ETF with a more specific investment style (such as value or growth) may perform less well than an ETF that allows greater flexibility in the investment of assets.

 

Liquidity Risk. An ETF may invest in certain securities that may be difficult or impossible to sell at a certain time and at a price that the ETF finds to be favorable. An ETF may have to accept an unfavorable price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on portfolio management or investment performance.

 

Prepayment Risk. Mortgage-backed securities are subject to the risk of unanticipated prepayments of principal with respect to mortgages in the security’s underlying pool of assets. While principal prepayments are passed through to the holders of the securities, prepayments also reduce the future payments on such securities and may reduce their value. Mortgage-backed securities are subject to the risk that an unexpected rise in interest rates will extend the life of a mortgage-backed security beyond the expected prepayment time, typically reducing the security’s value. Mortgage-backed securities are subject to the risk that an unexpected decline in interest rates will contract the life of a mortgage-backed security, thereby affecting its prepayment schedule, which may affect the value of the security.

 

Real Estate Investment Trust (“REIT”) Risk. REITs are subject to a variety of factors affecting the real estate market generally, such as economic conditions, overbuilding, mortgage rates and availability. In addition, REITs have additional risks because REITs are dependent on the capability of their managers, may have limited diversification, and could be significantly affected by changes in tax laws.

 

Reinvestment Risk. During periods of falling interest rates, a debt security with a high stated interest rate may be prepaid (or “called”) prior to its expected maturity date. If, during periods of falling interest rates, a debt security with a high stated interest rate is called, the unanticipated proceeds would likely be invested at lower interest rates, and an ETF’s income or yield may decline. Call provisions, which may lead to reinvestment risk, are most common for intermediate- and long-term municipal, corporate and mortgage-backed securities. To the extent securities subject to call were acquired at a premium, the potential for appreciation in the event of a decline in interest rates may be limited and may even result in losses.
May Lose Money rr_RiskLoseMoney You may lose money by investing in the 2025 ETF Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The information below provides an illustration of how the 2025 ETF Fund’s performance has varied over time. The bar chart and table provide some indication of the risks of investing in the 2025 ETF Fund by showing the changes in the 2025 ETF Fund’s investment performance from year to year during the periods indicated and by showing how the average annual total returns for the one-, five-year and since inception periods compare with a broad-based securities market index and an additional index with characteristics relevant to the Fund. The total return figures do not reflect expenses that apply to the separate account or related annuity contracts. The inclusion of these charges would reduce the total return figures for all periods shown. The 2025 ETF Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The information below provides an illustration of how the 2025 ETF Fund’s performance has varied over time.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The 2025 ETF Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Calendar Year Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 13.11% (quarter ended 9/30/09) and the lowest return for a quarter was (13.38)% (quarter ended 12/31/08).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.11%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.38%)
Performance Table: rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2013)
Wilshire 2025 ETF Fund | Wilshire 5000 IndexSM (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 33.09%
5 Years rr_AverageAnnualReturnYear05 18.59%
Since Inception rr_AverageAnnualReturnSinceInception 7.06%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
Wilshire 2025 ETF Fund | S&P Target Date 2025 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.03%
5 Years rr_AverageAnnualReturnYear05 12.77%
Since Inception rr_AverageAnnualReturnSinceInception 5.56%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
Wilshire 2025 ETF Fund | Wilshire 2025 ETF Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.21%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.13%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84%
Less Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%) [12]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 0.73%
Expense Example, 1 YEAR rr_ExpenseExampleYear01 75
Expense Example, 3 YEARS rr_ExpenseExampleYear03 257
Expense Example, 5 YEARS rr_ExpenseExampleYear05 455
Expense Example, 10 YEARS rr_ExpenseExampleYear10 1,027
2007 rr_AnnualReturn2007 4.36%
2008 rr_AnnualReturn2008 (28.11%)
2009 rr_AnnualReturn2009 20.60%
2010 rr_AnnualReturn2010 11.77%
2011 rr_AnnualReturn2011 0.26%
2012 rr_AnnualReturn2012 12.73%
2013 rr_AnnualReturn2013 12.22%
1 Year rr_AverageAnnualReturnYear01 12.22%
5 Years rr_AverageAnnualReturnYear05 11.32%
Since Inception rr_AverageAnnualReturnSinceInception 4.09%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
Wilshire 2035 ETF Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return rr_RiskReturnHeading

Wilshire 2035 ETF Fund
Investment objective: rr_ObjectiveHeading

Investment Objective
Investment objective rr_ObjectivePrimaryTextBlock

The Wilshire 2035 ETF Fund’s (“2035 ETF Fund” or “Fund”) investment objective is to provide high total return until its target retirement date. Thereafter the 2035 ETF Fund’s objective will be to seek high current income and,
Secondary objectives rr_ObjectiveSecondaryTextBlock

as a secondary objective, capital appreciation.
Fees and expenses of the fund: rr_ExpenseHeading

Fees and Expenses of the 2035 ETF Fund
Fees and expenses of the fund, narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the 2035 ETF Fund. The table below does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher.
Annual fund operating expenses, heading rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Date Of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2015-04-30
Portfolio turnover, heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio turnover, narrative rr_PortfolioTurnoverTextBlock

The 2035 ETF Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). These costs, which are not reflected in annual fund operating expenses or in the example, affect the 2035 ETF Fund’s performance. During the most recent fiscal year, the 2035 ETF Fund’s portfolio turnover rate was 7% of the average value of its portfolio.
Portfolio Turnover Rate rr_PortfolioTurnoverRate 7.00%
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

Example: This example is intended to help you compare the cost of investing in the 2035 ETF Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes one year of capped expenses, that your investment has a 5% return each year and that the 2035 ETF Fund’s operating expenses remain the same. The example does not reflect expenses that apply to separate accounts or related annuity contracts, and if such expenses were reflected, fees would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Strategy, Narrative rr_StrategyNarrativeTextBlock

The 2035 ETF Fund operates under a fund of funds structure. The 2035 ETF Fund seeks to achieve its investment objective by investing primarily in a portfolio of unaffiliated exchange traded funds (“ETFs”), which are funds traded on national securities exchanges with listed securities, in accordance with weightings determined by Wilshire Associates Incorporated (“Wilshire”). The ETFs, in turn, in an attempt to approximate the investment performance of their respective benchmarks, invest in a variety of U.S. and foreign equity, debt, commodities, money market securities, futures and other instruments in accordance with their own investment policies and strategies.

 

In managing the 2035 ETF Fund, Wilshire focuses on four key principles: asset allocation, portfolio structure, investment time horizon and fund management. Asset allocation across appropriate asset classes is the central theme of Wilshire’s investment philosophy. The 2035 ETF Fund invests in the ETFs according to a moderate asset allocation strategy designed for investors planning to retire in 2035, plus or minus two to three years. Wilshire seeks to reduce risk by investing in ETFs that are diversified within each asset class. The amounts invested in each of the ETFs will vary from time to time depending on the investment time horizon and Wilshire’s assessment of business, economic and market conditions, including any potential advantage of price shifts between the equity markets and the fixed income markets. The 2035 ETF Fund’s asset allocation will become more conservative over time. In general, however, Wilshire does not anticipate making frequent changes in asset allocation and will not attempt to time the market. As of the date of this Prospectus, the target asset allocation for the 2035 ETF Fund is 27% invested in ETFs which invest in fixed income securities and 73% invested in ETFs which invest in equity securities. Approximately 15 years after 2035, the 2035 ETF Fund’s target asset allocation will be approximately 73% invested in ETFs which invest in fixed income securities and 27% in ETFs which invest in equity securities.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

You may lose money by investing in the 2035 ETF Fund. In addition, by investing in the Fund, an investor assumes the same types of risks, either directly or indirectly, as investing in the ETFs. For the 2035 ETF Fund, the risks are as follows:

 

ETF Risk. ETFs in which the 2035 ETF Fund may invest involve certain inherent risks generally associated with investments in a portfolio of common stocks, including the risk that the general level of stock prices may decline, thereby adversely affecting the value of each unit of the ETF. Moreover, an ETF may not fully replicate the performance of its benchmark index because of the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of stocks held. Investing in ETFs, which are investment companies, involve duplication of advisory fees and certain other expenses.

 

Fund of Funds Risk. The Fund invest in ETFs. Shareholders of the Fund bear their proportionate share of the ETFs’ fees and expenses, as well as their share of the Fund’s fees and expenses. As a result, your cost of investing will be higher than the cost of investing directly in ETFs and may be higher than mutual funds that invest directly in stocks and bonds. Also, the Fund may be prevented from fully allocating assets to certain ETFs due to fund of funds investment limitations.

 

Future Developments. An ETF may take advantage of other investment practices that are not currently contemplated for use by ETFs, or are not available but may yet be developed, to the extent such investment practices are consistent with an ETF’s investment objective and legally permissible for the ETF. Such investment practices, if they arise, may involve risks that exceed those involved in the activities described above.

 

Market Risk. For equity securities, stock market movements will affect an ETF’s share price on a daily basis. Declines in value are possible because of declines in the stock market in general or because of a decline in the specific securities held by an ETF. There is also the possibility that the price of the security will fall because the market perceives that there is or will be a deterioration in the fundamental value of the issuer or poor earnings performance by the issuer. Market risk may affect a single company, industry, sector or the market as a whole. For debt securities, the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole.

 

Recent Market Events Risk. Over the past several years, the global financial crisis has caused a significant decline in the value and liquidity of many securities and unprecedented volatility in the markets.

 

Governmental and non-governmental issuers (notably in Europe) have defaulted on, or been forced to restructure their debts; and many other issuers have faced difficulties obtaining credit or refinancing existing obligations. These market conditions may continue, worsen or spread, including in the United States, Europe and elsewhere. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In response to the crisis, the U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including by keeping interest rates low. The withdrawal of this support, failure of efforts in response to the crisis, or investor perception that such efforts are not succeeding could negatively affect financial markets generally as well as reduce the value and liquidity of certain securities.

 

Portfolio Strategy Risk. The performance of an ETF is in part dependent upon an ETF’s investment adviser’s skill in making appropriate investments. To the extent that an ETF’s investments differ from the portfolio represented by the benchmark, there exists the potential for volatility of the return of the ETF relative to its index. As the industry and sector composition of the market or index changes over time, the implementation of an ETF’s strategy can lead to substantial differences in the sector or industry allocation of the ETF relative to the market or index.

 

Capitalization Risk. This is the risk of investments in small-capitalization companies. Investments in small-cap companies tend to be more volatile than investments in large-cap companies. An ETF’s investments in smaller capitalization companies may have additional risks because these companies often have limited product lines, markets or financial resources. This risk is greater for those ETFs with higher asset allocations to small-cap equities.

 

Credit Risk. For debt securities, credit risk is the possibility that an issuer or counterparty to a contract will fail to make timely payments of interest or principal to an ETF. The credit risk of an ETF depends on the credit quality of its underlying securities. In general, for debt securities, the lower the credit quality of an ETF’s securities, the higher the ETF’s risk, all other factors such as maturity being equal.

 

Currency Risk. Non-U.S. dollar-denominated securities are subject to fluctuations in the exchange rates between the U.S. dollar and foreign currencies which may negatively affect an investment. Adverse changes in exchange rates may erode or reverse any gains produced by foreign currency denominated investments, and may widen any losses.

 

Derivatives Risk. When an ETF uses derivatives (securities whose value is based upon the value of another security or an index) to hedge positions in the portfolio, any loss generated by the derivative security should be substantially offset by gains on the hedged investment and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. To the extent that a derivative is not used as a hedge (i.e., for speculation), an ETF is directly exposed to the potential gains and losses of that derivative. Gains and losses from non-hedging derivative positions may be substantially greater than the derivative’s original cost. To the extent that an ETF uses derivatives, an ETF will (to the extent required by applicable law) either(1) segregate cash or liquid assets in the prescribed amount or (2) otherwise “cover” its future obligations under the transaction, such as by holding an offsetting investment.

 

Equity Securities Risk. Equity investments, including common stocks, tend to be more volatile than bonds or money market instruments. To the extent an ETF is invested in equity securities, the value of the ETF’s shares will go up and down due to movement in the collective returns of the individual securities held by the ETF. Common stocks are subordinate to preferred stocks in a company’s capital structure, and if a company is liquidated, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of those who own common stocks.

 

Emerging Market Risk. Foreign investment risk may be particularly high to the extent an ETF invests in emerging market securities of issuers based in countries with developing economies. These securities may present market, credit, currency, liquidity, legal, political and other risks different from, or greater than, the risks of investing in developed foreign (non-U.S.) countries.

 

Foreign (Non-U.S.) Risk. An ETF’s investments in securities of non-U.S. issuers may experience more rapid and extreme changes in value than investments in securities of U.S. companies. The securities markets of many non-U.S. countries are relatively small, with a limited number of companies typically representing a small number of industries. Non-U.S. issuers usually are not subject to the same degree of regulation as U.S. issuers. Reporting, accounting and auditing standards of non-U.S. countries differ, in some cases significantly, from U.S. standards. Nationalization, expropriation or confiscatory taxation, currency blockage, or political changes or diplomatic developments could adversely affect an ETF’s investments in a country other than the United States. To the extent an ETF invests in a particular country or geographic region, the ETF may have more significant risk due to market changes or other factors affecting that country or region, including political instability and unpredictable economic conditions. This risk is greater for those ETFs with higher asset allocations to non-U.S. equities.

 

Inflation Risk. This is the risk that the value of assets or income from an ETF’s investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the ETF’s assets can decline as can the value of distributions.

 

Interest Rate Risk. For debt securities, interest rate risk is the possibility that the price will fall because of changing interest rates. In general, debt security prices move inversely to changes in interest rates. If interest rates rise, bond prices generally fall; if interest rates fall, bond prices generally rise. In addition, for a given change in interest rates, longer-maturity bonds fluctuate more in price (gaining or losing more in value) than shorter-maturity bonds.

 

Investment Style Risk. During certain market conditions, an ETF with a more specific investment style (such as value or growth) may perform less well than an ETF that allows greater flexibility in the investment of assets.

 

Liquidity Risk. An ETF may invest in certain securities that may be difficult or impossible to sell at a certain time and at a price that the ETF finds to be favorable. An ETF may have to accept an unfavorable price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on portfolio management or investment performance.

 

Prepayment Risk. Mortgage-backed securities are subject to the risk of unanticipated prepayments of principal with respect to mortgages in the security’s underlying pool of assets. While principal prepayments are passed through to the holders of the securities, prepayments also reduce the future payments on such securities and may reduce their value. Mortgage-backed securities are subject to the risk that an unexpected rise in interest rates will extend the life of a mortgage-backed security beyond the expected prepayment time, typically reducing the security’s value. Mortgage-backed securities are subject to the risk that an unexpected decline in interest rates will contract the life of a mortgage-backed security, thereby affecting its prepayment schedule, which may affect the value of the security.

 

Real Estate Investment Trust (“REIT”) Risk. REITs are subject to a variety of factors affecting the real estate market generally, such as economic conditions, overbuilding, mortgage rates and availability. In addition, REITs have additional risks because REITs are dependent on the capability of their managers, may have limited diversification, and could be significantly affected by changes in tax laws.

 

Reinvestment Risk. During periods of falling interest rates, a debt security with a high stated interest rate may be prepaid (or “called”) prior to its expected maturity date. If, during periods of falling interest rates, a debt security with a high stated interest rate is called, the unanticipated proceeds would likely be invested at lower interest rates, and an ETF’s income or yield may decline. Call provisions, which may lead to reinvestment risk, are most common for intermediate- and long-term municipal, corporate and mortgage-backed securities. To the extent securities subject to call were acquired at a premium, the potential for appreciation in the event of a decline in interest rates may be limited and may even result in losses.
May Lose Money rr_RiskLoseMoney You may lose money by investing in the 2035 ETF Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The information below provides an illustration of how the 2035 ETF Fund’s performance has varied over time. The bar chart and table provide some indication of the risks of investing in the 2035 ETF Fund by showing the changes in the 2035 ETF Fund’s investment performance from year to year during the periods indicated and by showing how the average annual total returns for the one-, five-year and since inception periods compare with a broad-based securities market index and an additional index with characteristics relevant to the Fund. The total return figures do not reflect expenses that apply to the separate account or related annuity contracts. The inclusion of these charges would reduce the total return figures for all periods shown. The 2035 ETF Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The information below provides an illustration of how the 2035 ETF Fund’s performance has varied over time.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The 2035 ETF Fund’s past investment performance does not necessarily indicate how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Calendar Year Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 14.72% (quarter ended 9/30/09) and the lowest return for a quarter was (16.13)% (quarter ended 12/31/08).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.72%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.13%)
Performance Table: rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2013)
Wilshire 2035 ETF Fund | Wilshire 5000 IndexSM (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 33.09%
5 Years rr_AverageAnnualReturnYear05 18.59%
Since Inception rr_AverageAnnualReturnSinceInception 7.06%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
Wilshire 2035 ETF Fund | S&P Target Date 2035 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 20.84%
5 Years rr_AverageAnnualReturnYear05 14.27%
Since Inception rr_AverageAnnualReturnSinceInception 5.61%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
Wilshire 2035 ETF Fund | Wilshire 2035 ETF Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.21%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.12%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.83%
Less Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%) [13]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 0.72%
Expense Example, 1 YEAR rr_ExpenseExampleYear01 74
Expense Example, 3 YEARS rr_ExpenseExampleYear03 254
Expense Example, 5 YEARS rr_ExpenseExampleYear05 450
Expense Example, 10 YEARS rr_ExpenseExampleYear10 $ 1,015
2007 rr_AnnualReturn2007 4.61%
2008 rr_AnnualReturn2008 (33.00%)
2009 rr_AnnualReturn2009 21.03%
2010 rr_AnnualReturn2010 12.52%
2011 rr_AnnualReturn2011 (1.68%)
2012 rr_AnnualReturn2012 14.09%
2013 rr_AnnualReturn2013 14.97%
1 Year rr_AverageAnnualReturnYear01 14.97%
5 Years rr_AverageAnnualReturnYear05 11.92%
Since Inception rr_AverageAnnualReturnSinceInception 3.49%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
[1] The Fund's shareholders indirectly bear, pro rata, the expenses of the Fund's assets invested in the Large Company Growth Portfolio and the Large Company Value Portfolio. These indirect expenses are based on actual expense ratios for the Large Company Growth Portfolio and the Large Company Value Portfolio. The Management Fee charged to the Fund (0.70%) is based on the average daily net assets of the Fund that are not invested in the Large Company Growth Portfolio and the Large Company Value Portfolio. The Fund's investments in the Large Company Growth Portfolio and the Large Company Value Portfolio are not reflected in the Fund's expense ratio as shown in the Financial Highlights table of this Prospectus. In addition, the Management Fee shown above is restated based upon the Fund's current allocation of the Fund's underlying fund investments in accordance with its change in investment strategy effective April 2, 2013. Future reallocation of the Fund's investments in underlying funds could change the Management Fee.
[2] Acquired Fund Fees and Expenses are restated to reflect the Fund's current allocations to underlying fund investments in accordance with its change in investment strategy effective April 2, 2013. Future reallocation of such investments could change Acquired Fund Fees and Expenses .
[3] The Stock/Bond Composite shown above consists of 50% of the S&P 500 Index, 35% of the Barclays U.S. Aggregate Bond Index and 15% of the MSCI EAFE Index.
[4] The Fund's shareholders indirectly bear, pro rata, the expenses of the Income Fund, the Large Company Growth Portfolio, the Large Company Value Portfolio, the Small Company Growth Portfolio, the Small Company Value Portfolio and the Wilshire International Equity Fund. These indirect expenses are based on actual expense ratios for the Income Fund, the Large Company Growth Portfolio, the Large Company Value Portfolio, the Small Company Growth Portfolio, the Small Company Value Portfolio and the Wilshire International Equity Fund. The Income Fund, the Large Company Growth Portfolio, the Large Company Value Portfolio, the Small Company Growth Portfolio, the Small Company Value Portfolio and the Wilshire International Equity Fund fees and expenses are not reflected in the Fund's expense ratio as shown in the Financial Highlights table of this Prospectus. In addition, the Management Fee shown above is restated based upon the Fund's current allocation of the Fund's underlying fund investments in accordance with its change in investment strategy effective April 2, 2013. Future reallocation of the Fund's investments in underlying funds could change the Management Fee.
[5] Acquired Fund Fees and Expenses are estimated based upon the Fund's current allocations to underlying fund investments. Future reallocation of such investments could change Acquired Fund Fees and Expenses.
[6] The Fund's shareholders indirectly bear, pro rata, the expenses of the Fund's assets invested in the Small Company Growth Portfolio and the Small Company Value Portfolio. These indirect expenses are based on actual expense ratios for the Small Company Growth Portfolio and the Small Company Value Portfolio. The Management Fee charged to the Fund (1.15%) is based on the average daily net assets of the Fund that are not invested in the Small Company Growth Portfolio and the Small Company Value Portfolio. The Fund's investments in the Small Company Growth Portfolio and the Small Company Value Portfolio are not reflected in the Fund's expense ratio as shown in the Financial Highlights table of this Prospectus. In addition, the Management Fee shown above is restated based upon the Fund's current allocation of the Fund's underlying fund investments in accordance with its change in investment strategy effective April 2, 2013. Future reallocation of the Fund's investments in underlying funds could change the Management Fee.
[7] Acquired Fund Fees and Expenses are restated to reflect the Fund's current allocations to underlying fund investments in accordance with its change in investment strategy effective April 2, 2013. Future reallocation of such investments could change Acquired Fund Fees and Expenses.
[8] Wilshire Associates Incorporated ("Wilshire") has entered into a contractual management fee waiver agreement with Wilshire Variable Insurance Trust (the "Trust") on behalf of the Small Cap Fund to waive 0.20% of its management fee, based on the average net daily assets of the Fund that are not invested in the Small Company Growth Portfolio and the Small Company Value Portfolio, to limit expenses of the Small Cap Fund. This agreement to waive a portion of the management fee continues through at least April 30, 2015 or upon the termination of the Advisory Agreement.
[9] The Fund's shareholders indirectly bear, pro rata, the expenses of the Fund's assets invested in the Wilshire International Equity Fund. These indirect expenses are based on actual expense ratios for the Wilshire International Equity Fund. The Management Fee charged to the Fund (1.00%) is based on the average daily net assets of the Fund that are not invested in the Wilshire International Equity Fund. The Fund's investment in the Wilshire International Equity Fund is not reflected in the Fund's expense ratio as shown in the Financial Highlights table of this Prospectus. In addition, the Management Fee shown above is restated based upon the Fund's current allocation of the Fund's underlying fund investments in accordance with its change in investment strategy effective April 2, 2013. Future reallocation of the Fund's investments in underlying funds could change the Management Fee.
[10] Wilshire Associates Incorporated ("Wilshire") has entered into a contractual management fee waiver agreement with Wilshire Variable Insurance Trust (the "Trust") on behalf of the International Equity Fund to waive 0.20% of its management fee, based on the average daily net assets of the Fund that are not invested in the Wilshire International Equity Fund, to limit expenses of the International Equity Fund. This agreement to waive a portion of the management fee continues through at least April 30, 2015 or upon the termination of the Advisory Agreement.
[11] Wilshire has contractually agreed to waive Management Fees and/or reimburse expenses for the Fund through April 30, 2015, so that the Total Annual Operating Expenses for the Fund, excluding the fees and expenses of the ETFs, will not exceed 0.60% (the "Expense Limitation" ). Wilshire may recoup the amount of any management fee waived/ or expenses reimbursed within three years after the year in which Wilshire incurred the expense if the recoupment does not exceed the existing Expense Limitation.
[12] Wilshire has contractually agreed to waive Management Fees and/or reimburse expenses for the Fund through April 30, 2015, so that the Total Annual Operating Expenses for the Fund, excluding the fees and expenses of the ETFs, will not exceed 0.60% (the "Expense Limitation" ). Total Annual Operating Expenses are the sum of the Fund's direct annual operating expenses and of the Fund's indirect ETF fees and expenses. Wilshire may recoup the amount of any management fee waived or expenses reimbursed within three years after the year in which Wilshire incurred the expense if the recoupment does not exceed the existing Expense Limitation.
[13] Wilshire has contractually agreed to waive Management Fees and/or reimburse expenses for the Fund through April 30, 2015, so that the Total Annual Operating Expenses for the Fund, excluding the fees and expenses of the ETFs, will not exceed 0.60% (the "Expense Limitation"). Total Annual Operating Expenses are the sum of the Fund's direct annual operating expenses and of the Fund's indirect ETF fees and expenses. Wilshire may recoup the amount of any management fee waived or expenses reimbursed within three years after the year in which Wilshire incurred the expense if the recoupment does not exceed the existing Expense Limitation.