Performance Management - Rational Premium Income Fund |
Dec. 31, 2025 |
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| Bar Chart and Performance Table [Heading] | Performance: | ||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The bar chart and accompanying table shown below provide an indication of the risks of investing in the Fund by showing the total return of its Institutional shares for each full calendar year, and by showing how its average annual returns compare over time with those of a broad-based market index. How the Fund has performed in the past (before and after taxes) is not necessarily an indication of how it will perform in the future. Updated performance information is available at no cost by calling 1-800-253-0412. Prior to December 31, 2025, the Fund was managed by a different sub-advisor with different investment strategies and policies. The performance data below for periods prior to December 31, 2025 reflects a different investment strategy. Consequently, the performance record may be less pertinent for investors considering whether to purchase shares of the Fund. The Funds performance may have been different if the Funds portfolio was managed under the current investment objective, strategies and policies.
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| Performance Past Does Not Indicate Future [Text] | How the Fund has performed in the past (before and after taxes) is not necessarily an indication of how it will perform in the future. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart and accompanying table shown below provide an indication of the risks of investing in the Fund by showing the total return of its Institutional shares for each full calendar year, and by showing how its average annual returns compare over time with those of a broad-based market index. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Returns | ||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] | During the period shown in the bar chart, the highest return for a quarter was 12.07% (quarter ended September 30, 2017), and the lowest return for a quarter was (11.56)% (quarter ended September 30, 2015).
The Funds Institutional shares year-to-date return as of September 30, 2025, was 2.69%.
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| Year to Date Return, Label [Optional Text] | The Funds Institutional shares year-to-date return | ||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 2.69% | ||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Sep. 30, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | the highest return for a quarter | ||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 12.07% | ||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Sep. 30, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | the lowest return for a quarter | ||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (11.56%) | ||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Sep. 30, 2015 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns (For periods ended December 31, 2024) | ||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the highest historical individual federal marginal income tax rate and do not reflect the impact of state and local taxes. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. After-tax returns are not relevant for shareholders who hold Fund shares in tax-advantaged accounts or to shares held by non-taxable entities. After-tax returns are only shown for Institutional shares. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Performance [Table] |
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| Performance Table One Class of after Tax Shown [Text] | After-tax returns for other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | reflects no deduction for fees, expenses or taxes | ||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Closing [Text Block] | After-tax returns are calculated using the highest historical individual federal marginal income tax rate and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. After-tax returns are not relevant for shareholders who hold Fund shares in tax-advantaged accounts or to shares held by non-taxable entities. After-tax returns are only shown for Institutional shares. After-tax returns for other share classes will vary. |
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| Performance Availability Phone [Text] | 1-800-253-0412 |