Performance Management - Small Cap Special Values Fund |
Nov. 30, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | The following Risk/Return Bar Chart and Table illustrate the risks of investing in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and comparing the Fund’s average annual returns to those of the Russell 3000® Index (a broad-based securities market index), the Russell 2000® Index, and the Russell 2000® Value Index. Effective April 30, 2026, the Fund changed its benchmark index from the Russell 2000® Value Index to the Russell 2000® Index, which is relevant to the Fund because it has characteristics similar to the Fund’s investment strategies. Fund management believes that the Russell 2000® Index is more representative of the securities in which the Fund invests. The Fund’s returns prior to April 30, 2026, as reflected in the bar chart and table, are the returns of the Fund when it followed a different investment objective and different investment strategies under the name, “Small Cap Special Values Fund.” Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown. Of course, past performance of the Fund is not necessarily an indication of how the Fund will perform in the future. Since the Fund’s inception, Wells Capital Management Incorporated (“WellsCap”) served as the Fund’s subadviser. In the fourth quarter of 2021, WellsCap changed its name to Allspring Global Investments, LLC (“Allspring”). From inception through September 11, 2009, Putnam Investment Management, LLC (“Putnam”) acted as co‑subadviser. Dreman Value Management, LLC succeeded Putnam as co‑subadviser from September 11, 2009, until December 7, 2015. Beginning December 7, 2015, Allspring (formerly WellsCap) served as the Fund’s sole subadviser. Effective April 30, 2026, Invesco Advisers, Inc. (“Invesco”) replaced Allspring as the Fund’s subadviser.
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| Performance Past Does Not Indicate Future [Text] | Of course, past performance of the Fund is not necessarily an indication of how the Fund will perform in the future. |
| Performance Information Illustrates Variability of Returns [Text] | The following Risk/Return Bar Chart and Table illustrate the risks of investing in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and comparing the Fund’s average annual returns to those of the Russell 3000® Index (a broad-based securities market index), the Russell 2000® Index, and the Russell 2000® Value Index. Effective April 30, 2026, the Fund changed its benchmark index from the Russell 2000® Value Index to the Russell 2000® Index, which is relevant to the Fund because it has characteristics similar to the Fund’s investment strategies. |
| Performance Additional Market Index [Text] | Effective April 30, 2026, the Fund changed its benchmark index from the Russell 2000® Value Index to the Russell 2000® Index, which is relevant to the Fund because it has characteristics similar to the Fund’s investment strategies. Fund management believes that the Russell 2000® Index is more representative of the securities in which the Fund invests. |
| Bar Chart Does Not Reflect Sales Loads [Text] | Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown. |
| Bar Chart Closing [Text Block] | During the period shown in the bar chart: Highest Quarterly Return: December 31, 2020 28.56% Lowest Quarterly Return: March 31, 2020 -33.63% Year to Date Most Recent Quarter: March 31, 2026 -0.07%
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| Performance Table Heading | Average Annual Total Returns (For the periods ended December 31, 2025) |
| Performance Table Market Index Changed | Effective April 30, 2026, the Fund changed its benchmark index from the Russell 2000® Value Index to the Russell 2000® Index, which is relevant to the Fund because it has characteristics similar to the Fund’s investment strategies. Fund management believes that the Russell 2000® Index is more representative of the securities in which the Fund invests. |
| Small Cap Special Values Fund | |
| Prospectus [Line Items] | |
| Year to Date Return, Label [Optional Text] | Year to Date Most Recent Quarter: |
| Bar Chart, Year to Date Return | (0.07%) |
| Bar Chart, Year to Date Return, Date | Mar. 31, 2026 |
| Highest Quarterly Return, Label [Optional Text] | Highest Quarterly Return: |
| Highest Quarterly Return | 28.56% |
| Highest Quarterly Return, Date | Dec. 31, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | Lowest Quarterly Return: |
| Lowest Quarterly Return | (33.63%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |