v3.26.1
Fees and Expenses
Apr. 30, 2026
Large Company Growth Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses of the Large Company Growth Portfolio
Expense Narrative [Text Block]
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Portfolio. You may pay other fees, such as brokerage commissions and other fees to financials intermediaries, which are not reflected in the tables and examples below.
Operating Expenses Caption [Optional Text] Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] This example is intended to help you compare the cost of investing in the Portfolio 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 Portfolio’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]
The Portfolio 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Portfolio’s performance. For the fiscal year ended December 31, 2025, the Portfolio’s portfolio turnover rate was 104% of the average value of its portfolio.
Portfolio Turnover, Rate 104.00%
Large Company Value Portfolio Series  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses of the Large Company Value Portfolio
Expense Narrative [Text Block] This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Portfolio. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Operating Expenses Caption [Optional Text] Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] This example is intended to help you compare the cost of investing in the Portfolio 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 Portfolio’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]
The Portfolio 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Portfolio’s performance. For the fiscal year ended December 31, 2025, the Portfolio’s portfolio turnover rate was 51% of the average value of its portfolio.
Portfolio Turnover, Rate 51.00%
Small Company Growth Portfolio Series  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses of the Small Company Growth Portfolio
Expense Narrative [Text Block]
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Portfolio. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Operating Expenses Caption [Optional Text] Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] This example is intended to help you compare the cost of investing in the Portfolio 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 Portfolio’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]
The Portfolio 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Portfolio’s performance. For the fiscal year ended December 31, 2025, the Portfolio’s portfolio turnover rate was 121% of the average value of its portfolio.
Portfolio Turnover, Rate 121.00%
Small Company Value Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses of the Small Company Value Portfolio
Expense Narrative [Text Block]
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Portfolio. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Operating Expenses Caption [Optional Text] Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] This example is intended to help you compare the cost of investing in the Portfolio 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 Portfolio’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]
The Portfolio 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Portfolio’s performance. For the fiscal year ended December 31, 2025, the Portfolio’s portfolio turnover rate was 63% of the average value of its portfolio.
Portfolio Turnover, Rate 63.00%
Wilshire 5000 IndexSM Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses of the Wilshire 5000 IndexSM Fund
Expense Narrative [Text Block]
This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Index Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total Annual Fund Operating Expenses for the Portfolio will not correlate to the Ratio of Expenses to Average Net Assets shown in the Portfolio’s most recent Annual Report and in the Financial Highlights section of the Prospectus, which reflects the operating expenses of the Portfolio and does not include acquired fund fees and expenses.
Operating Expenses Caption [Optional Text] Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] This example is intended to help you compare the cost of investing in the Index 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 Index Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]
The Index 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 the Index 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 Index Fund’s performance. For the fiscal year ended December 31, 2025, the Index Fund’s portfolio turnover rate was 5% of the average value of its portfolio.
Portfolio Turnover, Rate 5.00%
Wilshire International Equity Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses of the International Fund
Expense Narrative [Text Block]
This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the International Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Optional Text] Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] This example is intended to help you compare the cost of investing in the International 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 International Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]
The International 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 International 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 International Fund’s performance. For the fiscal year ended December 31, 2025, the International Fund’s portfolio turnover rate was 54% of the average value of its portfolio.
Portfolio Turnover, Rate 54.00%
Wilshire Income Opportunities Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Income Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] This example is intended to help you compare the cost of investing in the Income 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 Income Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]
The Income 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 Income 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 Income Fund’s performance. For the fiscal year ended December 31, 2025, the Income Fund’s portfolio turnover rate was 67% of the average value of its portfolio.
Portfolio Turnover, Rate 67.00%