This table describes the fees and expenses that you may pay if you buy and hold shares of the Series. The table below does not take into account any of the fees, expenses or charges associated with variable annuity contracts or variable life insurance policies offered by participating insurance companies. If such fees, expenses or charges were reflected, the overall expenses would be higher. For more information on these fees, expenses and charges, please refer to your contract or policy prospectus.

Operating Expenses Caption [Text]

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ANNUAL OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

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PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

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The Series 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 operating expenses or in the example, affect the Series’ performance. During the most recent fiscal year, the Series’ portfolio turnover rate was 172% of the average value of its portfolio.

Portfolio Turnover, Rate

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172.00%

Expense Example [Heading]

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EXAMPLE

Expense Example Narrative [Text Block]

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This Example is intended to help you compare the cost of investing in the Series with the cost of investing in other mutual funds. It does not reflect fees, expenses or charges of any variable annuity contract or variable life insurance policy, which, if reflected, would increase expenses.

Expense Example by, Year, Caption [Text]

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The Example assumes that you invest $10,000 in the Series for the time periods indicated and reflects expenses whether or not you 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 Series’ operating expenses remain the same. Although the actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Closing [Text Block]

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The above Example reflects applicable contractual fee waiver/expense reimbursement arrangements for the duration of the arrangements only.

Strategy [Heading]

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PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block]

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Series Z pursues its objective by investing, under normal market conditions, in long and short positions of domestic equity and equity-related securities (including swaps and other derivative investments giving long or short exposure to domestic equity securities).

The Investment Manager uses a proprietary evaluation process to generate an expected return for individual stocks that considers market risk factors generally and risks specific to the companies in which the Series invests. Market risk factors include, among other factors, company size, enterprise value, and sector. The Investment Manager seeks to construct portfolios of equity-related investments that maintain long positions in instruments that provide exposure to risk factors that the Investment Manager considers to be undervalued by the equity markets and sells short instruments that provide exposure to risk factors that the Investment Manager considers to be overvalued by the equity markets. The process uses fundamentally-based, forward-looking forecasts of equity cash flows to generate return expectations for individual stocks. Then, the expected returns for the universe of stocks is further evaluated using quantitative techniques to estimate the market’s implied valuation of broad market risk factors as well as the company-specific risks. Finally, a portfolio is constructed within guidelines that buys long the stocks (or derivatives that give exposure to stocks) that give the portfolio both the broad risk characteristics and company-specific risks that are perceived to be undervalued and sells short stocks (or derivatives that give exposure to stocks) for which those characteristics are perceived to be overpriced. These guidelines contain risk controls that seek to: limit industry and sector concentration; promote portfolio issuer diversification; and avoid making portfolio investments contrary to the Investment Manager’s macroeconomic views. “Alpha” in the Series’ name refers to the potential for the Series’ portfolio to achieve returns that are favorable relative to the amount of risk taken. Of course, there is no guarantee that the Series will achieve its objective of long-term growth of capital, and an investment in the Series involves significant risk.

The Series will ordinarily hold simultaneous long and short positions in equity securities or securities markets that provide exposure up to a level equal to 150% of the Series' net assets for both the long and short positions. That level of exposure is obtained through derivatives, including swap agreements (which include, but are not limited to, total return swap agreements). The Investment Manager intends to maintain a low overall net exposure (the difference between the notional value of long positions and the notional value of short positions) for the portfolio, typically varying between 50% net long and 30% net short to seek to maintain low correlation to traditional equity markets, lower than market volatility and seek to provide consistent absolute return. The overall net exposure will change as market opportunities change, and may, based on the Investment Manager’s view of current market conditions, be outside this range.

The Series may invest in domestic equity securities, including small-, mid-, and large-capitalization securities. The Series also may invest in derivative instruments, including swaps on selected baskets of equity securities, to enable the Series to pursue its investment objective without investing directly in the securities of companies to which the Series is seeking exposure. The Series may also invest in derivatives, such as options and futures contracts, to hedge or gain leveraged exposure to a particular sector, industry, market risk factor, or company and/or to obtain or replicate market exposure depending on market conditions. The Series will often invest in instruments traded in the over the-counter (“OTC”) market, which generally provides for less transparency than exchange-traded instruments. The Series also may enter into long positions or short sales of broad-based stock indices for hedging purposes in an effort to reduce the Series’ risk or volatility through, among other instruments, exchange-traded funds ("ETFs") and closed-end funds. The use of derivatives may create a leveraging effect on the Series which will force the Series to take offsetting positions or earmark or segregate assets to be used as collateral. The Series actively trades its investments, which can result in significant fluctuations in the Series' portfolio turnover rate.

While the Series anticipates investing in these securities and instruments to seek to achieve its investment objective, the extent of the Series’ investment in these securities and instruments may vary from day-to-day depending on a number of different factors, including price, availability, and general market conditions. On a day-to-day basis, the Series may hold U.S. government securities, short-term, high quality (rated AA or higher) fixed-income instruments, money market instruments, overnight and fixed-term repurchase agreements, cash and other cash equivalents with maturities of one year or less to collateralize its derivative positions. The Series also may enter into repurchase agreements with counterparties that are deemed to present acceptable credit risks.

Under adverse or unstable market conditions or abnormal circumstances, the Series could invest some or all of its assets in cash, derivatives, fixed-income instruments, government bonds, money market instruments, repurchase agreements or securities of other investment companies. The Series may be unable to pursue or achieve its investment objective during that time and temporary investments could reduce the benefit from any upswing in the market.

Risk [Heading]

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PRINCIPAL RISKS

Risk Narrative [Text Block]

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The value of an investment in the Series will fluctuate and is subject to investment risks, which means investors could lose money. An investment in the Series is not a bank deposit and is not insured or guaranteed by the FDIC or any governmental agency. There is no assurance that the Series will achieve its investment objective. The principal risks of investing in the Series are summarized below.

Counterparty Credit Risk—The Series makes investments in financial instruments and OTC-traded derivatives involving counterparties to gain exposure to a particular group of securities, index, asset class or other reference asset without actually purchasing those securities or investments, to hedge a position or for other investment purposes. Through these investments and related arrangements (e.g., prime brokerage or securities lending arrangements or derivatives transactions), the Series is exposed to credit risks that the counterparty may be unwilling or unable to make timely payments or otherwise to meet its contractual obligations. If the counterparty becomes bankrupt or defaults on (or otherwise becomes unable or unwilling to perform) its payment or other obligations to the Series, the Series may not receive the full amount that it is entitled to receive or may experience delays in recovering the collateral or other assets held by, or on behalf of, the counterparty. If this occurs, the value of your shares in the Series will decrease.

Credit Risk—The Series could lose money if the issuer or guarantor of a fixed-income instrument or a counterparty to a derivatives transaction or other transaction is unable or unwilling, or perceived to be unable or unwilling, to pay interest or repay principal on time or defaults. The issuer, guarantor or counterparty could also suffer a rapid decrease in credit quality rating, which would adversely affect the volatility of the value and liquidity of the instrument. Credit ratings may not be an accurate assessment of liquidity or credit risk.

Derivatives Risk—Derivatives may pose risks in addition to and greater than those associated with investing directly in securities, currencies or other investments, including risks relating to leverage, imperfect correlations with underlying investments or the Series’ other portfolio holdings, high price volatility, lack of availability, counterparty credit, liquidity, valuation and legal restrictions. Their use is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The Series' use of derivatives to obtain short exposure may result in greater volatility of the Series' net asset value per share. If the Investment Manager is incorrect about its expectations of market conditions, the use of derivatives could also result in a loss, which in some cases may be unlimited. Some of the derivatives in which the Series invests may be traded (and privately negotiated) in the OTC market. OTC derivatives are subject to heightened counterparty, credit, liquidity and valuation risks. Certain risks also are specific to the derivatives in which the Series invests.

Futures Contracts Risk—Futures contracts are exchange-traded contracts that call for the future delivery of an asset at a certain price and date, or cash settlement of the terms of the contract. Risks of futures contracts may be caused by an imperfect correlation between movements in the price of the instruments and the price of the underlying assets. In addition, there is a risk that the Series may not be able to enter into a closing transaction because of an illiquid market. Exchanges can limit the number of positions that can be held or controlled by the Series or the Investment Manager, thus limiting the ability to implement the Series’ strategies. Futures markets are highly volatile and the use of futures may increase the volatility of the Series’ net asset value ("NAV"). Futures are also subject to leverage risks and to liquidity risk.

Options Contracts Risk—Options or options on futures contracts give the holder of the option the right, but not the obligation, to buy (or to sell) a position in a security or in a contract to the writer of the option, at a certain price. Options are subject to correlation risk because there may be an imperfect correlation between the options and the markets for underlying instruments that could cause a given transaction to fail to achieve its objectives. The successful use of options depends on the Investment Manager’s ability to predict correctly future price fluctuations and the degree of correlation between the markets for options and the underlying instruments. Exchanges can limit the number of positions that can be held or controlled by the Series or the Investment Manager, thus limiting the ability to implement the Series’ strategies. Options are also particularly subject to leverage risk and can be subject to liquidity risk.

Swap Agreements Risk—Swap agreements are contracts among the Series and a counterparty to exchange the return of the pre-determined underlying investment (such as the rate of return of the underlying index). Swap agreements may be negotiated bilaterally and traded OTC between two parties or, in some instances, must be exchange-traded through a futures commission merchant and/or cleared through a clearinghouse that serves as a central counterparty. Risks associated with the use of swap agreements are different from those associated with ordinary portfolio securities transactions, due in part to the fact they could be considered illiquid and many swaps trade on the OTC market. Swaps are particularly subject to counterparty credit, correlation, valuation, liquidity and leveraging risks. Certain standardized swaps are subject to mandatory exchange trading and central clearing. Exchange trading and central clearing are intended to reduce counterparty credit risk and increase liquidity but exchange trading and central clearing do not make swap transactions risk-free. Additionally, applicable regulators have adopted rules imposing certain margin requirements, including minimums, on OTC swaps, which may result in the Series and its counterparties posting higher margin amounts for OTC swaps, which could increase the cost of swap transactions to the Series and impose added operational complexity.

Equity Securities Risk—Equity securities include common stocks and other equity and equity-related securities (and securities convertible into stocks). The prices of equity securities generally fluctuate in value more than fixed-income investments, may rise or fall rapidly or unpredictably and may reflect real or perceived changes in the issuing company’s financial condition and changes in the overall market or economy. A decline in the value of equity securities held by the Series will adversely affect the value of your investment in the Series. Common stocks generally represent the riskiest investment in a company and dividend payments (if declared) to preferred stockholders generally rank junior to payments due to a company's debtholders. The Series may lose a substantial part, or even all, of its investment in a company’s stock.

Interest Rate Risk—Fixed-income and other debt instruments are subject to the possibility that interest rates could change. Changes in interest rates may adversely affect the Series' investments in these instruments, such as the value or liquidity of, and income generated by, the investments. Interest rates may change as a result of a variety of factors, and the change may be sudden and significant, with unpredictable impacts on the financial markets and the Series' investments. Fixed-income and other debt instruments with longer durations are more sensitive to changes in interest rates and, thus, subject to more volatility than similar instruments with shorter durations. Generally, when interest rates increase, the values of fixed-income and other debt instruments decline and when interest rates decrease, the values of fixed-income and other debt instruments rise. During periods of rising interest rates, because changes in interest rates on adjustable rate securities may lag behind changes in market rates, the value of such securities may decline until their interest rates reset to market rates. During periods of declining interest rates, because the interest rates on adjustable rate securities generally reset downward, their market value is unlikely to rise to the same extent as the value of comparable fixed rate securities. The risks associated with rising interest rates are heightened given the recent low interest rate environment.

Investments by Investing Funds and Other Large Shareholders—The Series is subject to the risk that a large investor, including certain other investment companies, purchases or redeems a large percentage of Series shares at any time. As a result, the Series’ performance or liquidity may be adversely affected as the Series tends to hold a large proportion of its assets in cash and may have to sell investments at disadvantageous times or prices to meet large redemption requests.

Investment in Investment Vehicles Risk—Investing in other investment vehicles, including ETFs, closed-end funds and other mutual funds, subjects the Series to those risks affecting the investment vehicle, including the possibility that the value of the underlying securities held by the investment vehicle could decrease or the portfolio becomes illiquid. Moreover, the Series and its shareholders will incur its pro rata share of the underlying vehicles’ expenses, which will reduce the Series' performance. In addition, investments in an ETF are subject to, among other risks, the risk that the ETF's shares may trade at a discount or premium relative to the net asset value of the shares and the listing exchange may halt trading of the ETF's shares.

Large-Capitalization Securities Risk—The Series is subject to the risk that large-capitalization securities may underperform other segments of the equity market or the equity market as a whole. Larger, more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and may not be able to attain the high growth rate of smaller companies, especially during extended periods of economic expansion.

Leverage Risk—The Series’ use of leverage, through borrowings or instruments such as derivatives and reverse repurchase agreements, may cause the Series to be more volatile and riskier than if it had not been leveraged.

Liquidity and Valuation Risk—It may be difficult for the Series to purchase and sell particular investments within a reasonable time at a fair price, or the price at which it has been valued by the Investment Manager for purposes of the Series’ net asset value, causing the Series to be less liquid and unable to realize what the Investment Manager believes should be the price of the investment. Valuation of portfolio investments may be difficult, such as during periods of market turmoil or reduced liquidity, and for investments that may, for example, trade infrequently or irregularly. In these and other circumstances, an investment may be valued using fair value methodologies, which are inherently subjective, reflect good faith judgments based on available information and may not accurately estimate the price at which the Series could sell the investment at that time. These risks may be heightened for fixed-income instruments because of the near historically low interest rate environment as of the date of this prospectus.

Management Risk—The Series is actively managed, which means that investment decisions are made based on investment views. There is no guarantee that the investment views will produce the desired results or expected returns, causing the Series to fail to meet its investment objective or underperform its benchmark index or funds with similar investment objectives and strategies. Furthermore, active and frequent trading that can accompany active management, also called “high turnover,” may have a negative impact on performance. Active and frequent trading may result in higher brokerage costs or mark-up charges, which are ultimately passed on to shareholders of the Series.

Market Risk—The value of, or income generated by, the securities held by the Series may fluctuate rapidly and unpredictably as a result of factors affecting individual companies or changing economic, political, social or financial market conditions throughout the world. The performance of these investments may underperform the general securities markets or other types of securities.

Mid-Capitalization Securities Risk—The Series is subject to the risk that mid-capitalization securities may underperform other segments of the equity market or the equity market as a whole. Securities of mid-capitalization companies may be more speculative, volatile and less liquid than securities of large companies. Mid-capitalization companies tend to have inexperienced management as well as limited product and market diversification and financial resources, and may be more vulnerable to adverse developments than large capitalization companies.

Quantitative Investing Risk—There is no guarantee that a quantitative model or algorithm used by the Investment Manager, and the investments selected based on the model or algorithm, will produce the desired results. The Series may be adversely affected by imperfections, errors or limitations in the construction and implementation of the model or algorithm and the Investment Manager's ability to properly analyze or timely adjust the metrics or update the data underlying the model or features of the algorithm. Other quantitative methods and techniques used by the Investment Manager, and the investments selected based on these methods and techniques, are also subject to these types of risks.

Regulatory and Legal Risk—U.S. and non-U.S. governmental agencies and other regulators regularly implement additional regulations and legislators pass new laws that affect the investments held by the Series, the strategies used by the Series or the level of regulation applying to the Series (such as regulations related to investments in derivatives and other transactions). These regulations and laws impact the investment strategies, performance, costs and operations of the Series.

Repurchase Agreements and Reverse Repurchase Agreements Risk—In the event of the insolvency of the counterparty to a repurchase agreement or reverse repurchase agreement, recovery of the repurchase price owed to the Series or, in the case of a reverse repurchase agreement, the securities or other assets sold by the Series, may be delayed. Because reverse repurchase agreements may be considered to be the practical equivalent of borrowing funds, they constitute a form of leverage. If the Series reinvests the proceeds of a reverse repurchase agreement at a rate lower than the cost of the agreement, entering into the agreement will lower the Series’ yield.

Short Sale and Short Exposure Risk—Short selling a security involves selling a borrowed security with the expectation that the value of that security will decline, so that the security may be purchased at a lower price when returning the borrowed security. A short exposure through a derivative exposes the Series to counterparty credit risk and leverage risk. The risk for loss on a short sale or other short exposure is greater than a direct investment in the security itself because the price of the borrowed security may rise, thereby increasing the price at which the security must be purchased. The risk of loss through a short sale or other short exposure may in some cases be theoretically unlimited. Government actions also may affect the Series’ ability to engage in short selling.

Small-Capitalization Securities Risk—The Series is subject to the risk that small-capitalization securities may underperform other segments of the equity market or the equity market as a whole. Securities of small-capitalization companies may be more speculative, volatile and less liquid than securities of larger companies. Small-capitalization companies tend to have inexperienced management as well as limited product and market diversification and financial resources, and may be more vulnerable to adverse developments than mid- or large-capitalization companies.

U.S. Government Securities Risk—U.S. government securities may or may not be backed by the full faith and credit of the U.S. government. U.S. government securities are subject to the risks associated with fixed-income and debt securities, particularly interest rate risk and credit risk.

Risk Lose Money [Text]

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The value of an investment in the Series will fluctuate and is subject to investment risks, which means investors could lose money.

Risk Not Insured Depository Institution [Text]

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An investment in the Series is not a bank deposit and is not insured or guaranteed by the FDIC or any governmental agency.

Bar Chart and Performance Table [Heading]

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PERFORMANCE INFORMATION

Performance Narrative [Text Block]

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The following chart and table provide some indication of the risks of investing in the Series by showing the Series’ calendar year performance from year to year and average annual returns for the one, five and ten year periods compared to those of a broad measure of market performance. The information also shows how the Series’ performance compares with the returns of a Morningstar category average consistent with the Series’ investment strategy. As with all mutual funds, past performance is not necessarily an indication of how the Series will perform in the future.

The performance figures do not reflect fees, expenses or charges associated with variable annuity contracts and variable life insurance policies that offer the Series as an underlying investment option, and, if such fees, expenses or charges were reflected, the performance figures would be lower.

Important Note: Effective January 28, 2015, significant changes to the Series’ principal investment strategies and portfolio managers were made. In connection with these changes, the Series also added a second benchmark, the Morningstar Long/Short Equity Category Average. Please note that the Series’ performance track record prior to January 28, 2015 related only to the Series’ former investments, which were materially different from those currently pursued by the Series, and is not indicative of the Series’ future performance.

Performance Information Illustrates Variability of Returns [Text]

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Performance Past Does Not Indicate Future [Text]

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As with all mutual funds, past performance is not necessarily an indication of how the Series will perform in the future.

Bar Chart Closing [Text Block]

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Highest Quarter Return		Lowest Quarter Return
Q3 2010	15.79%	Q3 2011	-16.98	%

Performance Table Heading

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AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2019)

SERIES Z (ALPHA OPPORTUNITY SERIES) | ICE BofAML 3 Month US Treasury Bill Index

Prospectus:

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Index No Deduction for Fees, Expenses, Taxes [Text]

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(reflects no deductions for fees, expenses or taxes)

Label

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ICE BofAML 3-Month U.S. Treasury Bill Index (reflects no deductions for fees, expenses or taxes)

1 Year

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2.28%

5 Years

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1.07%

10 Years

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0.58%

SERIES Z (ALPHA OPPORTUNITY SERIES) | Morningstar Long/Short Equity Category Average

Prospectus:

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Index No Deduction for Fees, Expenses, Taxes [Text]

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(reflects no deductions for fees, expenses or taxes)

Label

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Morningstar Long/Short Equity Category Average (reflects no deductions for fees, expenses or taxes)

1 Year

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9.79%

5 Years

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2.42%

10 Years

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4.43%

SERIES Z (ALPHA OPPORTUNITY SERIES) | A

Prospectus:

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Management Fees (as a percentage of Assets)

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0.90%

Distribution and Service (12b-1) Fees

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0.25%

Other Expenses (as a percentage of Assets):

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2.37%

Acquired Fund Fees and Expenses

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3.52%

Fee Waiver or Reimbursement

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(1.52%)

^[1]

Net Expenses (as a percentage of Assets)

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2.00%

Fee Waiver or Reimbursement over Assets, Date of Termination

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May 1, 2022

Expense Example, with Redemption, 1 Year

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$ 203

Expense Example, with Redemption, 3 Years

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788

Expense Example, with Redemption, 5 Years

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1,557

Expense Example, with Redemption, 10 Years

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$ 3,582

Annual Return 2010

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20.74%

Annual Return 2011

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1.77%

Annual Return 2012

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13.40%

Annual Return 2013

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27.83%

Annual Return 2014

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9.36%

Annual Return 2015

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(4.69%)

Annual Return 2016

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12.79%

Annual Return 2017

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7.22%

Annual Return 2018

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(11.57%)

Annual Return 2019

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(2.45%)

Highest Quarterly Return, Label

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Highest Quarter Return

Highest Quarterly Return, Date

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Sep. 30, 2010

Highest Quarterly Return

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15.79%

Lowest Quarterly Return, Label

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Lowest Quarter Return

Lowest Quarterly Return, Date

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Sep. 30, 2011

Lowest Quarterly Return

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(16.98%)

Label

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Series Z (Alpha Opportunity Series)

1 Year

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(2.45%)

5 Years

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(0.12%)

10 Years

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6.83%

[1]

1 Security Investors, LLC, also known as Guggenheim Investments (the “Investment Manager”), has contractually agreed through May 1, 2022 to waive fees and/or reimburse expenses to the extent necessary to limit the ordinary operating expenses (including distribution (12b-1) fees, but exclusive of brokerage costs, dividends on securities sold short, acquired fund fees and expenses, interest, taxes, litigation, indemnification, and extraordinary expenses) (“Operating Expenses”) of the Series to the annual percentage of average daily net assets for the Series to 2.00%. The Investment Manager is entitled to reimbursement by the Series of fees waived or expenses reimbursed during any of the previous 36 months beginning on the date of the expense limitation agreement, provided that the Operating Expenses do not exceed the then-applicable expense cap. The agreement will expire when it reaches its termination or when the Investment Manager ceases to serve as such and it can be terminated by the Series’ Board of Trustees, with certain waived fees and reimbursed expenses subject to the recoupment rights of the Investment Manager.