v3.26.1
Expense Example
Apr. 30, 2026
USD ($)
Large Company Growth Portfolio | Large Company Growth Portfolio - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 132
Expense Example, with Redemption, 3 Years 416
Expense Example, with Redemption, 5 Years 722
Expense Example, with Redemption, 10 Years 1,588
Large Company Growth Portfolio | Large Company Growth Portfolio - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 102
Expense Example, with Redemption, 3 Years 318
Expense Example, with Redemption, 5 Years 522
Expense Example, with Redemption, 10 Years 1,225
Large Company Value Portfolio Series | Large Company Value Portfolio - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 132
Expense Example, with Redemption, 3 Years 412
Expense Example, with Redemption, 5 Years 713
Expense Example, with Redemption, 10 Years 1,568
Large Company Value Portfolio Series | Large Company Value Portfolio - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 102
Expense Example, with Redemption, 3 Years 325
Expense Example, with Redemption, 5 Years 566
Expense Example, with Redemption, 10 Years 1,257
Small Company Growth Portfolio Series | Small Company Growth Portfolio - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 137
Expense Example, with Redemption, 3 Years 556
Expense Example, with Redemption, 5 Years 1,001
Expense Example, with Redemption, 10 Years 2,236
Small Company Growth Portfolio Series | Small Company Growth Portfolio - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 112
Expense Example, with Redemption, 3 Years 492
Expense Example, with Redemption, 5 Years 897
Expense Example, with Redemption, 10 Years 2,028
Small Company Value Portfolio | Small Company Value Portfolio - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 137
Expense Example, with Redemption, 3 Years 567
Expense Example, with Redemption, 5 Years 1,022
Expense Example, with Redemption, 10 Years 2,285
Small Company Value Portfolio | Small Company Value Portfolio - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 112
Expense Example, with Redemption, 3 Years 492
Expense Example, with Redemption, 5 Years 897
Expense Example, with Redemption, 10 Years 2,028
Wilshire 5000 IndexSM Fund | Wilshire 5000 IndexSM Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 57
Expense Example, with Redemption, 3 Years 179
Expense Example, with Redemption, 5 Years 313
Expense Example, with Redemption, 10 Years 701
Wilshire 5000 IndexSM Fund | Wilshire 5000 IndexSM Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 35
Expense Example, with Redemption, 3 Years 109
Expense Example, with Redemption, 5 Years 191
Expense Example, with Redemption, 10 Years 431
Wilshire International Equity Fund | Wilshire International Equity Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 153
Expense Example, with Redemption, 3 Years 529
Expense Example, with Redemption, 5 Years 930
Expense Example, with Redemption, 10 Years 2,052
Wilshire International Equity Fund | Wilshire International Equity Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 127
Expense Example, with Redemption, 3 Years 431
Expense Example, with Redemption, 5 Years 756
Expense Example, with Redemption, 10 Years 1,677
Wilshire Income Opportunities Fund | Wilshire Income Opportunities Fund - Investment Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 117
Expense Example, with Redemption, 3 Years 414
Expense Example, with Redemption, 5 Years 733
Expense Example, with Redemption, 10 Years 1,637
Wilshire Income Opportunities Fund | Wilshire Income Opportunities Fund - Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 319
Expense Example, with Redemption, 5 Years 565
Expense Example, with Redemption, 10 Years $ 1,269