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Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Mar. 31, 2018
Entity Registrant Name dei_EntityRegistrantName RYDEX SERIES FUNDS
Central Index Key dei_EntityCentralIndexKey 0000899148
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jul. 30, 2018
Document Effective Date dei_DocumentEffectiveDate Aug. 01, 2018
Prospectus Date rr_ProspectusDate Aug. 01, 2018
RYDEX SERIES FUND CLASS P | Guggenheim Long Short Equity Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading GUGGENHEIM LONG SHORT EQUITY FUND
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Guggenheim Long Short Equity Fund (the “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold Class P shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES(expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The 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 Fund shares are held in a taxable account. These costs, which are not reflected in the Total Annual Fund Operating Expenses or the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 328% of the average value of its portfolio. The Fund’s portfolio turnover rate is calculated without regard to cash instruments and most derivatives. If such instruments were included, the Fund’s portfolio turnover rate might be significantly higher.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 328.00%
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund 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 Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund pursues its objective by investing, under normal market conditions, at least 80% of its assets (net assets plus the amount of borrowings for investment purposes) in long and short positions of domestic equity securities or equity-related instruments, including swaps and other derivatives that provide long or short exposure to domestic equity securities. For purposes of determining compliance with the Fund’s 80% investment policy, equity-related derivatives generally will be valued based on their notional value.

The Fund seeks to achieve its investment objective by constructing portfolios that maintain long positions in instruments that provide exposure to risk factors the Advisor considers to be undervalued by the equity markets and sells short instruments that provide exposure to risk factors the Advisor considers to be overvalued by the equity markets. The Advisor considers both market risk factors generally and risks specific to the companies in which the Fund invests. To construct the portfolios, the Advisor uses fundamentally-based, forward-looking forecasts of equity cash flows to generate return expectations for individual companies. 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 company-specific risks. Finally, the Advisor applies its proprietary evaluation process to buy long those stocks (or derivatives that give exposure to the stocks) that give the portfolio both the broad risk characteristics and company-specific risks that are perceived to be undervalued and sell short those stocks (or derivatives that give exposure to the stocks) with characteristics that are perceived to be overvalued.

The Fund will ordinarily hold simultaneous long and short positions in equity securities or securities markets that provide exposure up to a level equal to 300% of the Fund’s net assets for both the long and short positions. That level of exposure is obtained through derivatives, including swap agreements. At any point in time, the Fund’s portfolio may be significantly net long or net short. The Fund’s overall net exposure will change as market opportunities change.

The Fund invests in equity securities, including small-, mid-, and large-capitalization securities, such as U.S. traded common stocks, American Depositary Receipts (“ADRs”) and other investment companies, but also may invest in derivative instruments which primarily consist of swaps on baskets of selected equity securities, futures contracts, and options on securities, futures contracts, and stock indices. The Fund’s investments in derivatives enable the Fund to pursue its investment objective without investing directly in the securities of companies to which the Fund is seeking exposure. The Fund also may invest in derivatives to hedge or gain leveraged exposure to a particular industry, style or company depending on market conditions.

Investments in derivative instruments, such as futures, options and swap agreements, have the economic effect of creating financial leverage in the Fund’s portfolio because such investments may give rise to losses that exceed the amount the Fund has invested in those instruments. Financial leverage will magnify, sometimes significantly, the Fund’s exposure to any increase or decrease in prices associated with a particular reference asset resulting in increased volatility in the value of the Fund’s portfolio. The value of the Fund’s portfolio is likely to experience greater volatility over short-term periods. While such financial leverage has the potential to produce greater gains, it also may result in greater losses, which in some cases may cause the Fund to liquidate other portfolio investments at a loss to comply with limits on leverage and asset segregation requirements imposed by the Investment Company Act of 1940 or to meet redemption requests. The Fund’s use of derivatives and the leveraged investment exposure created by such use are expected to be significant.

Certain of the Fund’s derivatives investments may be traded in the over-the-counter (“OTC”) market. The Fund also may enter into short sales of broad-based stock indices for hedging purposes in an effort to reduce portfolio risk or volatility. While the Fund anticipates investing in these instruments to seek to achieve its investment objective, the extent of the Fund’s investment in these 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 Fund may hold U.S. government securities, short-term, high quality (rated AA or higher) fixed income securities, money market instruments, overnight and fixed-term repurchase agreements, cash and other cash equivalents with maturities of one year or less to collateralize its derivatives positions or for defensive purposes to seek to avoid losses during adverse market conditions. The Fund also may enter into repurchase agreements with counterparties that are deemed to present acceptable credit risks. In an effort to ensure that the Fund is fully invested on a day-to-day basis, the Fund may conduct significant trading activity at or just prior to the close of the U.S. financial markets.

Because the Fund seeks to gain exposure to different industries and sectors in the economy, from time to time, the Fund may invest a significant percentage of its assets in issuers in one or more groups of industries or sectors of the economy. While the Fund’s sector and industry exposure is expected to vary over time, as of June 30, 2018, the Fund has significant exposure to the Consumer Discretionary Sector, Consumer Staples Sector, Energy Sector, Financials Sector, Health Care Sector, Industrials Sector, Information and Technology Sector, Materials Sector, Real Estate Sector and Utilities Sector, as each sector is defined by the Global Industry Classification Standard, a widely recognized industry classification methodology developed by MSCI, Inc. and Standard & Poor’s Financial Services LLC. Also, as of June 30, 2018, the Fund's investments are concentrated (i.e., more than 25% of its assets) in securities issued by companies in the Equity Real Estate Investment Trusts Industry, a separate industry within the Real Estate Sector. The Fund is non-diversified and, therefore, may invest a greater percentage of its assets in a particular issuer in comparison to a diversified fund.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money. In addition to this risk, the Fund is subject to the principal risks described below.

COUNTERPARTY CREDIT RISK—The Fund may invest in financial instruments involving counterparties that attempt to gain exposure to a particular group of securities, index or asset class without actually purchasing those securities or investments, or to hedge a position. The Fund’s use of such financial instruments, including swap agreements, involves risks that are different from those associated with ordinary portfolio securities transactions. For example, the Fund is exposed to the risk that the counterparty may be unwilling or unable to make timely payments to meet its contractual obligations or may fail to return holdings that are subject to the agreement with the counterparty. If the counterparty becomes bankrupt or defaults on its payment obligations to the Fund, the Fund may not receive the full amount that it is entitled to receive. If this occurs, the value of your shares in the Fund will decrease.

DEPOSITARY RECEIPT RISK—The Fund may hold the securities of non-U.S. companies in the form of ADRs. The underlying securities of the ADRs in the Fund’s portfolio are subject to fluctuations in foreign currency exchange rates that may affect the value of the Fund’s portfolio. In addition, the value of the securities underlying the ADRs may change materially when the U.S. markets are not open for trading. Investments in the underlying foreign securities also involve political and economic risks distinct from those associated with investing in the securities of U.S. issuers.

DERIVATIVES RISK—The Fund’s investments in derivatives may pose risks in addition to and greater than those associated with investing directly in securities or other investments, including risks relating to leverage, imperfect correlations with underlying investments or the Fund’s 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. If the Advisor 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. Certain risks are specific to the derivatives in which the Fund invests.

SWAP AGREEMENTS RISK—Swap agreements are contracts among the Fund 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 transacted through a futures commission merchant and 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 central clearing. Central clearing is expected to reduce counterparty credit risk and increase liquidity, but central clearing does not make swap transactions risk-free.

FUTURES CONTRACTS RISK—Futures contracts are typically 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 securities. In addition, there is the risk that the Fund 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 Fund or the Advisor, thus limiting the ability to implement the Fund’s strategies. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s net asset value (“NAV”). Futures also are 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 to buy (or to sell) a position in a security or in a contract to the writer of the option, at a certain price. They are subject to correlation risk because there may be an imperfect correlation between the options and the securities markets that cause a given transaction to fail to achieve its objectives. The successful use of options depends on the Advisor’s ability to correctly predict future price fluctuations and the degree of correlation between the options and securities markets. Exchanges can limit the number of positions that can be held or controlled by the Fund or the Advisor, thus limiting the ability to implement the Fund’s strategies. Options also are particularly subject to leverage risk and can be subject to liquidity risk.

EARLY CLOSING RISK—The Fund is subject to the risk that unanticipated early closings of securities exchanges and other financial markets may result in the Fund’s inability to buy or sell securities or other financial instruments on that day and may cause the Fund to incur substantial trading losses.

EQUITY RISK—The Fund is subject to the risk that the value of the equity securities and equity-based derivatives in the Fund’s portfolio will decline due to volatility in the equity market caused by general market and economic conditions, perceptions regarding particular industries represented in the equity market, or factors relating to specific companies to which the Fund has investment exposure.

INDUSTRY CONCENTRATION RISK—The Fund expects to concentrate (i.e., invest more than 25% of its net assets) its investments in a limited number of issuers conducting business in the same industry or group of related industries. To the extent the Fund does so, the Fund is more vulnerable to adverse market, economic, regulatory, political or other developments affecting that industry or group of related industries than a fund that invests its assets more broadly. As of June 30, 2018, the Fund's investments are concentrated in securities issued by companies in the Equity Real Estate Investment Trusts (REITs) Industry. As a result of the Fund's concentration in the Equity Real Estate Investment Trusts (REITs) Industry, the Fund is subject to the risks associated with that industry. The Equity Real Estate Investment Trusts (REITs) Industry is a separate industry within the Real Estate Sector that includes companies or trusts engaged in the acquisition, development, ownership, leasing, management and operation of: hotel and resort properties (hotel & resort REITs); office properties (office REITs); properties serving the health care industry, including hospitals, nursing homes and and assisted living properties (health care REITs); residential properties, including multi-family homes, apartments, manufactured homes and student housing properties (residential REITs); shopping malls, outlet malls and neighborhood and community shopping centers (retail REITs); and other specialized properties including storage and other properties that do not generate a majority of their revenues and income from real estate rental and leasing operations (specialized REITS). For information regarding the Fund's investments in the Equity Real Estate Investment Trusts (REITs) Industry and real estate investment trusts, see "Sector Risk" and "Real Estate Investment Trust (REIT) Risk” below.
 
INVESTMENT IN INVESTMENT VEHICLES RISK—Investing in other investment vehicles, including exchange-traded funds (“ETFs”), closed-end funds and other mutual funds, subjects the Fund 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 Fund and its shareholders will incur its pro rata share of the underlying vehicles’ expenses, which will reduce the Fund’s 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 Fund is subject to the risk that large-capitalization stocks 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.

LEVERAGING RISK—The Fund’s investment in derivative instruments generally requires a small investment relative to the amount of investment exposure assumed. As a result, such investments may give rise to losses that exceed the amount invested in those instruments. The cost of investing in such instruments generally increases as interest rates increase, which will lower the Fund’s return.
 
LIQUIDITY AND VALUATION RISK—In certain circumstances, it may be difficult for the Fund to purchase and sell a particular investment within a reasonable time at a fair price, or the price at which it has been valued by the Advisor for purposes of the Fund’s NAV, causing the Fund to be less liquid. While the Fund intends to invest in liquid securities and financial instruments, under certain market conditions, such as when trading in a particular investment has been halted temporarily by an exchange because the maximum price change of that investment has been realized, it may be difficult or impossible for the Fund to liquidate such investments. In addition, the ability of the Fund to assign an accurate daily value to certain investments may be difficult, and the Advisor may be required to fair value the investments.

MANAGEMENT RISK—The Fund 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 Fund to fail to meet its investment objective or underperform its benchmark index or funds with similar investment objectives and strategies. Furthermore, active trading that can accompany active management, also called “high turnover,” may have a negative impact on performance. Active trading may result in higher brokerage costs or mark-up charges, which are ultimately passed on to shareholders of the Fund. Active trading also may result in adverse tax consequences.

MARKET RISK—The market value of the securities and derivatives held by the Fund may fluctuate over time in response to factors affecting individual companies or other factors such as changing economic, political or financial markets.

MID-CAPITALIZATION SECURITIES RISK—The Fund is subject to the risk that medium-capitalization stocks may underperform other segments of the equity market or the equity market as a whole. Securities of medium-capitalization companies may experience more price volatility, greater spreads between their bid and ask prices, lower trading volumes, and cyclical or static growth prospects. Medium-capitalization companies often have limited product lines, markets or financial resources, and may therefore be more vulnerable to adverse developments than larger capitalization companies.

NON-DIVERSIFICATION RISK—The Fund is considered non-diversified and can invest a greater portion of its assets in securities of individual issuers than a diversified fund. As a result, changes in the market value of a single issuer's securities could cause greater fluctuations in the value of Fund shares than would occur in a diversified fund.

OTC TRADING RISK—Certain of the derivatives in which the Fund may invest may be traded (and privately negotiated) in the OTC market. While the OTC derivatives market is the primary trading venue for many derivatives, it is largely unregulated and provides for less transparency than a national exchange. As a result and similar to other privately negotiated contracts, the Fund is subject to counterparty credit risk with respect to such derivatives contracts.

PORTFOLIO TURNOVER RISK—The Fund’s strategy may frequently involve buying and selling portfolio securities, which may lead to increased costs to the Fund. Portfolio turnover risk may cause the Fund’s performance to be less than you expect.

REAL ESTATE INVESTMENT TRUST ("REIT") RISK—REITs are securities that invest substantially all of their assets in real estate, trade like stocks and may qualify for special tax considerations. Investments in REITs subject the Fund to risks associated with the direct ownership of real estate. Market conditions or events affecting the overall real estate and REIT markets, such as declining property values or rising interest rates, could have a negative impact on the real estate market and the value of REITs in general. REITs may be affected by changes in the value of the underlying property owned by the trusts, economic downturns which may have a material effect on the real estate in which the REITs invest and their underlying portfolio securities. Further, REITs are dependent upon specialized management skills and may have their investments in relatively few properties, or in a small geographic area or a single property type. Failure of a company to qualify as a REIT under federal tax law may have adverse consequences to the Fund. In addition, REITs have their own expenses, and the Fund will bear a proportionate share of those expenses.

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 Fund or, in the case of a reverse repurchase agreement, the securities sold by the Fund, 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 Fund 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 Fund’s yield.

SECTOR RISK—The Fund is subject to the Sector Risks described below.

Consumer Discretionary Sector Risk. The Fund’s investments are exposed to issuers conducting business in the Consumer Discretionary Sector. The manufacturing segment of the Consumer Discretionary Sector includes automotive, household durable goods, leisure equipment and textiles and apparel. The services segment includes hotels, restaurants and other leisure facilities, media production and services, and consumer retailing and services. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Consumer Discretionary Sector.  The performance of companies operating in the Consumer Discretionary Sector has historically been closely tied to the performance of the overall economy, and also is affected by economic growth, consumer confidence, attitudes and spending. Changes in demographics and consumer tastes also can affect the demand for, and success of, consumer products and services in the marketplace. Moreover, the Consumer Discretionary Sector encompasses those businesses that tend to be the most sensitive to economic cycles.

Consumer Staples Sector Risk. The Fund’s investments are exposed to issuers conducting business in the Consumer Staples Sector. The Consumer Staples Sector includes manufacturers and distributors of food, beverages and tobacco and producers of non-durable household goods and personal products. It also includes food and drug retailing companies as well as hypermarkets and consumer super centers. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Consumer Staples Sector. The performance of companies operating in the Consumer Staples Sector has historically been closely tied to the performance of the overall economy, and also is affected by consumer confidence, demands and preferences, and spending. In addition, companies in the Consumer Staples Sector may be subject to risks pertaining to the supply of, demand for, and prices of raw materials.

Energy Sector Risk. The Fund's investments are exposed to issuers conducting business in the Energy Sector. The Energy Sector includes companies operating in the exploration and production, refining and marketing, and storage and transportation of oil and gas and coal and consumable fuels. It also includes companies that offer oil and gas equipment and services. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Energy Sector. The performance of companies operating in the Energy Sector is closely tied to the price and supply of energy fuels and international political events.

Financials Sector Risk. The Fund's investments are exposed to issuers conducting business in the Financials Sector. The Financials Sector includes companies involved in banking, thrifts and mortgage finance, specialized finance, consumer finance, asset management and custody banks, investment banking and brokerage and insurance. It also includes the Financial Exchanges & Data and Mortgage Real Estate Investment Trusts ("REITs") sub-industries. Certain financial sector companies serve as counterparties with which the Fund may enter into derivatives agreements or other similar contractual arrangements. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Financials Sector, which may adversely affect a company's ability to fulfill its obligation as a financial counterparty. Companies operating in the Financials Sector are subject to extensive government regulation, which may limit the financial commitments they can make and the interest rates and fees they can charge. Profitability is largely dependent on the availability and cost of capital funds, and can fluctuate significantly when interest rates change or due to increased competition.

Health Care Sector Risk.  The Fund's investments are exposed to issuers conducting business in the Health Care Sector. The Health Care Sector includes health care providers and services, companies that manufacture and distribute health care equipment and supplies, and health care technology companies. It also includes companies involved in the research, development, production and marketing of pharmaceuticals and biotechnology products. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Health Care Sector. The prices of the securities of companies operating in the Health Care Sector are closely tied to government regulation and approval of their products and services, which can have a significant effect on the price and availability of those products and services.

Industrials Sector Risk. The Fund's investments are exposed to issuers conducting business in the Industrials Sector. The Industrials Sector includes manufacturers and distributors of capital goods such as aerospace and defense, building projects, electrical equipment and machinery and companies that offer construction and engineering services. It also includes providers of commercial and professional services including printing, environmental and facilities services, office services and supplies, security and alarm services, human resource and employment services, research and consulting services. It also includes companies that provide transportation services. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Industrials Sector. The prices of the securities of companies operating in the Industrials Sector may fluctuate due to the level and volatility of commodity prices, the exchange value of the dollar, import controls, worldwide competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control devices.

Information Technology Sector Risk. The Fund's investments are exposed to issuers conducting business in the Information Technology Sector. The Information Technology Sector includes companies that offer software and information technology services, manufacturers and distributors of technology hardware and equipment such as communications equipment, cellular phones, computers and peripherals, electronic equipment and related instruments and semiconductors. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Information Technology Sector. The prices of the securities of companies operating in the Information Technology Sector are closely tied to market competition, increased sensitivity to short product cycles and aggressive pricing, and problems with bringing products to market.

Materials Sector Risk. The Fund's investments are exposed to issuers conducting business in the Materials Sector. The Materials Sector includes companies that manufacture chemicals, construction materials, glass, paper, forest products and related packaging products, and metals, minerals and mining companies, including producers of steel. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Materials Sector. The prices of the securities of companies operating in the Materials Sector may fluctuate widely due to the level and volatility of commodity prices, the exchange value of the U.S. dollar, import controls, worldwide competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control devices.

Real Estate Sector Risk. The Fund's investments are exposed to issuers conducting business in the Real Estate Sector. The Real Estate Sector contains companies operating in real estate development and operation. It also includes companies offering real estate related services and REITs. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Real Estate Sector. The performance of companies operating in the Real Estate Sector has historically been cyclical and particularly sensitive to the overall economy and market changes, including declines in the value of real estate or, conversely, saturation of the real estate market, economic downturns and defaults by borrowers or tenants during such periods, increases in competition, possible lack of mortgage funds or other limits to accessing the credit or capital markets, and changes in interest rates.

Utilities Sector Risk. The Fund's investments are exposed to issuers conducting business in the Utilities Sector. The Utilities Sector comprises utility companies such as electric, gas and water utilities. It also includes independent power producers and energy traders and companies that engage in generation and distribution of electricity using renewable sources. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Utilities Sector. The prices of the securities of companies operating in the Utilities Sector are closely tied to government regulation and market competition.

SHORT SALES 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 Fund 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 Fund’s ability to engage in short selling.

SMALL-CAPITALIZATION SECURITIES RISK—The Fund is subject to the risk that small-capitalization stocks may underperform other segments of the equity market or the equity market as a whole. Small-capitalization companies may be more vulnerable than larger, more established organizations to adverse business or economic developments. Securities of small-capitalization companies may experience much more price volatility, greater spreads between their bid and ask prices, significantly lower trading volumes, and cyclical or static growth prospects. Small-capitalization companies often have limited product lines, markets or financial resources, and may therefore be more vulnerable to adverse developments than larger capitalization companies.

TRADING HALT RISK—The Fund typically will hold short-term options and futures contracts. The major exchanges on which these contracts are traded, such as the Chicago Mercantile Exchange, have established limits on how much the trading price of an option or futures contract may decline over various time periods within a day, and may halt trading in a contract that exceeds such limits. If a trading halt occurs, the Fund may temporarily be unable to purchase or sell certain securities, options or futures contracts. Such a trading halt near the time the Fund prices its shares may prevent the Fund from achieving its investment objective.

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] rr_RiskLoseMoney As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund is considered non-diversified and can invest a greater portion of its assets in securities of individual issuers than a diversified fund. As a result, changes in the market value of a single issuer's securities could cause greater fluctuations in the value of Fund shares than would occur in a diversified fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart shows the performance of the Class P shares of the Fund from year to year. The variability of performance over time provides an indication of the risks of investing in the Fund. The following table shows the performance of the Class P shares of the Fund as an average over different periods of time in comparison to the performance of a broad-based market index, the S&P 500® Index, and other comparative benchmark, the Morningstar Long/Short Equity Category Average. Effective upon the close of business on April 30, 2015, the Fund converted its existing Class H shares to Class P shares. For periods prior to May 1, 2015, the performance shown reflects the performance of Class H shares. The returns shown have not been adjusted to reflect any differences in expenses between Class H shares and Class P shares. However, the Fund's Class P shares would have had annual returns substantially similar to those of the Fund's former Class H shares because they are invested in the same portfolio of securities and have a similar, if not identical, expense structure to that of Class H shares. The figures in the bar chart and table assume the reinvestment of dividends and capital gains distributions. Of course, this past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. On May 31, 2017, the Fund’s principal investment strategies were revised; therefore, the performance and average annual total returns shown for periods prior to May 31, 2017 may have differed had the Fund’s current principal investment strategies been in effect during those periods.

Updated performance information is available on the Fund’s website at www.guggenheiminvestments.com or by calling 800.820.0888.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the performance of the Class P shares of the Fund from year to year. The variability of performance over time provides an indication of the risks of investing in the Fund. The following table shows the performance of the Class P shares of the Fund as an average over different periods of time in comparison to the performance of a broad-based market index, the S&P 500® Index, and other comparative benchmark, the Morningstar Long/Short Equity Category Average.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.820.0888
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.guggenheiminvestments.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Of course, this past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
The performance information shown below for Class P shares is based on a calendar year. The year-to-date return for the period from January 1, 2018 through June 30, 2018 is -7.77%.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest Quarter Return
 
Lowest Quarter Return
 
Q3 2009
15.91%
 
Q4 2008
-21.78
 %
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURN (for periods ended December 31, 2017)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
RYDEX SERIES FUND CLASS P | Guggenheim Long Short Equity Fund | S&P 500 Index  
Prospectus: rr_ProspectusTable  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel S&P 500® Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 15.79%
10 Years rr_AverageAnnualReturnYear10 8.50%
RYDEX SERIES FUND CLASS P | Guggenheim Long Short Equity Fund | Morningstar Long/Short Equity Category Average  
Prospectus: rr_ProspectusTable  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel Morningstar Long/Short Equity Category Average (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 10.58%
5 Years rr_AverageAnnualReturnYear05 5.52%
10 Years rr_AverageAnnualReturnYear10 4.23%
RYDEX SERIES FUND CLASS P | Guggenheim Long Short Equity Fund | Class P  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol RYSRX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Component1 Other Expenses rr_Component1OtherExpensesOverAssets 0.06%
Component2 Other Expenses rr_Component2OtherExpensesOverAssets 0.55%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.61% [1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.76%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 179
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 554
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 954
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,073
Annual Return 2008 rr_AnnualReturn2008 (40.23%)
Annual Return 2009 rr_AnnualReturn2009 27.32%
Annual Return 2010 rr_AnnualReturn2010 10.77%
Annual Return 2011 rr_AnnualReturn2011 (6.88%)
Annual Return 2012 rr_AnnualReturn2012 4.00%
Annual Return 2013 rr_AnnualReturn2013 18.22%
Annual Return 2014 rr_AnnualReturn2014 2.82%
Annual Return 2015 rr_AnnualReturn2015 1.15%
Annual Return 2016 rr_AnnualReturn2016 0.38%
Annual Return 2017 rr_AnnualReturn2017 14.82%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (7.77%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.91%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.78%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.82%
5 Years rr_AverageAnnualReturnYear05 7.22%
10 Years rr_AverageAnnualReturnYear10 1.47%
RYDEX SERIES FUND CLASS P | Guggenheim Long Short Equity Fund | Class P | After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 14.82%
5 Years rr_AverageAnnualReturnYear05 7.22%
10 Years rr_AverageAnnualReturnYear10 1.45%
RYDEX SERIES FUND CLASS P | Guggenheim Long Short Equity Fund | Class P | After Taxes on Distributions and Sales  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 8.39%
5 Years rr_AverageAnnualReturnYear05 5.67%
10 Years rr_AverageAnnualReturnYear10 1.13%
RYDEX SERIES FUND CLASS P | Guggenheim Event Driven and Distressed Strategies Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading GUGGENHEIM EVENT DRIVEN AND DISTRESSED STRATEGIES FUND
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Guggenheim Event Driven and Distressed Strategies Fund (the “Fund”) seeks to achieve capital growth.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold Class P shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination This Agreement may be terminated only with the approval of the Fund’s Board of Trustees. In any event, this undertaking will continue for at least twelve months from the date of this Prospectus.
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The 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 Fund shares are held in a taxable account. These costs, which are not reflected in the Total Annual Fund Operating Expenses or the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 69% of the average value of its portfolio. The Fund’s portfolio turnover rate is calculated without regard to cash instruments and most derivatives. If such instruments were included, the Fund’s portfolio turnover rate might be significantly higher.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 69.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses in this fee table (before and after any fee waivers and/or expense reimbursements) may not correlate to the expense ratios in the Fund’s financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund 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 Fund’s operating expenses (including one year of capped expenses each period) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund’s investment methodology is based on a systematic algorithm developed through extensive quantitative research that is designed to select and weight a basket of six liquid, investable factors: small cap and distressed equities, high yield (or “junk”) bonds and credit, merger arbitrage and an illiquidity premium. In combination, these six factors seek to target return characteristics similar to those of the universe of event driven hedge funds. Event driven hedge funds seek to profit from potential mispricings of the securities and the pricing spreads created by the risks related to a specific corporate transaction or market event. Such events can include: mergers, bankruptcies, financial or operational stress, restructurings, asset sales, recapitalizations, spin-offs, litigation, regulatory and legislative changes as well as other types of corporate events. Small cap equities, high yield bonds, and the equities of distressed companies combined with credit derivatives are a proxy for the primary instruments and exposures traded by distressed and opportunistic credit funds. A merger arbitrage index offers exposure to a liquid, diversified and broadly representative set of arbitrage positions on announced American and Western European merger and acquisition deals. The illiquidity factor seeks to represent the risk premium that may be achieved by holding illiquid securities. The factors and weights of those factors identified by the algorithm may change over time and may be long or short at any given time.

The Fund primarily seeks to obtain these exposures through swap agreements, but it also may invest in a combination of: domestic and foreign common stock; American Depositary Receipts (“ADRs”); credit or equity-linked instruments, primarily consisting of exchange-traded notes (“ETNs”); exchange-traded funds (“ETFs”); other pooled investment vehicles; and other derivatives, primarily consisting of futures and options on securities, futures and securities indices. Swaps and futures and options contracts enable the Fund to purse its investment objective without investing directly in the securities underlying such contracts. While the Fund may write (sell) and purchase swaps, it expects primarily to purchase swaps. While the Fund anticipates investing in these instruments to seek to achieve its investment objective, the extent of the Fund’s investment in these instruments may vary from day to day depending on a number of different factors, including price, availability, and general market conditions.

From time to time, the Fund also may enter into short sales and invest in short positions of certain of its portfolio investments. The Fund may invest in derivatives to hedge or gain leveraged exposure to the components of a particular investable factor. On a day-to-day basis, the Fund may hold U.S. government securities, short-term, high quality (rated AA or higher) fixed income securities, money market instruments, overnight and fixed-term repurchase agreements, cash, and other cash equivalents with maturities of one year or less to collateralize its derivatives positions. The Fund also may enter into repurchase agreements with counterparties that are deemed to present acceptable credit risks.

In an effort to ensure that the Fund is fully invested on a day-to-day basis, the Fund may conduct any necessary trading activity at or just prior to the close of the U.S. financial markets. The Fund also may engage in frequent and active trading or portfolio investments to achieve its investment objective. Because the Fund seeks to gain exposure to different industries and sectors in the economy, from time to time, the Fund may invest a significant percentage of its assets in issuers in one or more groups of industries or sectors of the economy. The Fund is non-diversified and, therefore, may invest a greater percentage of its assets in a particular issuer in comparison to a diversified fund.

Investments in derivative instruments, such as futures, options and swap agreements, have the economic effect of creating financial leverage in the Fund’s portfolio because such investments may give rise to losses that exceed the amount the Fund has invested in those instruments. Financial leverage will magnify, sometimes significantly, the Fund’s exposure to any increase or decrease in prices associated with a particular reference asset resulting in increased volatility in the value of the Fund’s portfolio. The value of the Fund’s portfolio is likely to experience greater volatility over short-term periods. While such financial leverage has the potential to produce greater gains, it also may result in greater losses, which in some cases may cause the Fund to liquidate other portfolio investments at a loss to comply with limits on leverage and asset segregation requirements imposed by the Investment Company Act of 1940 or to meet redemption requests. The Fund’s use of derivatives and the leveraged investment exposure created by such use are expected to be significant.

Certain of the Fund’s derivatives investments may be traded in the over-the-counter (“OTC”) market. The Fund also may enter into short sales of broad-based stock indices for hedging purposes in an effort to reduce portfolio risk or volatility. While the Fund anticipates investing in these instruments to seek to achieve its investment objective, the extent of the Fund’s investment in these 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 Fund may hold U.S. government securities, short-term, high quality (rated AA or higher) fixed income securities, money market instruments, overnight and fixed-term repurchase agreements, cash and other cash equivalents with maturities of one year or less to collateralize its derivatives positions or for defensive purposes to seek to avoid losses during adverse market conditions. The Fund also may enter into repurchase agreements with counterparties that are deemed to present acceptable credit risks.

The Fund may invest a portion of its assets, and at times, a substantial portion of its assets, in other short-term fixed-income investment companies advised by the Advisor, or an affiliate of the Advisor, for various purposes, including for liquidity management purposes (e.g., to increase yield on liquid investments used to collateralize derivatives positions) or when such investment companies present a more cost-effective investment option than direct investments in the underlying securities. Investments in these investment companies will significantly increase the portfolio’s exposure to certain other asset categories, including: (i) a broad range of high yield, high risk debt securities rated below the top four long-term rating categories by a nationally recognized statistical rating organization or, if unrated, determined by the Advisor to be of comparable quality (also known as “junk bonds”); (ii) securities issued by the U.S. government or its agencies and instrumentalities; (iii) collateralized loan obligations (“CLOs”), other asset-backed securities (including mortgage-backed securities) and similarly structured debt investments; and (iv) other short-term fixed income securities. Such investments will expose the Fund to the risks of these asset categories and increases or decreases in the value of these investments may cause the Fund to deviate from its investment objective.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money. In addition to this risk, the Fund is subject to the principal risks described below.

ASSET-BACKED AND MORTGAGE-BACKED SECURITIES RISK—Through its investments in other investment companies, the Fund may have exposure to asset-backed securities, including mortgage-backed securities and structured finance investments. Investors in these securities generally receive payments that are part interest and part return of principal. These payments may vary based on the rate at which the underlying borrowers pay off their loans. Some asset-backed securities, including mortgage-backed securities, may have structures that make their reaction to interest rates and other factors difficult to predict, making their prices very volatile and they are subject to liquidity risk.

CLO RISK—Through its investments in other investment companies, the Fund may have exposure to CLOs. A CLO is a trust typically collateralized by a pool of loans, which may include, among others, domestic and foreign senior secured loans, senior unsecured loans, and subordinate corporate loans, including loans that may be rated below investment grade or equivalent unrated loans. The cash flows from the trust are split into two or more portions, called tranches, varying in risk and yield. CLO tranches can experience substantial losses due to actual defaults, increased sensitivity to defaults due to collateral default and disappearance of protecting tranches, market anticipation of defaults, as well as aversion to CLO securities as a class. The risks of an investment in a CLO depend largely on the type of the collateral securities and the class of the CLO in which the Fund invests.

COUNTERPARTY CREDIT RISK—The Fund may invest in financial instruments involving counterparties that attempt to gain exposure to a particular group of securities, index or asset class without actually purchasing those securities or investments, or to hedge a position. The Fund’s use of such financial instruments, including swap agreements, involves risks that are different from those associated with ordinary portfolio securities transactions. For example, the Fund is exposed to the risk that the counterparty may be unwilling or unable to make timely payments to meet its contractual obligations or may fail to return holdings that are subject to the agreement with the counterparty. If the counterparty becomes bankrupt or defaults on its payment obligations to the Fund, the Fund may not receive the full amount that it is entitled to receive. If this occurs, the value of your shares in the Fund will decrease.

CREDIT RISK—The Fund could lose money if the debt securities or other instruments in which it invests decline in price, or the issuer or guarantor of such instrument fails to pay interest or principal when due because the issuer or guarantor of the instrument experiences an actual or perceived decline in its financial status. Generally, credit risk is increased when a portfolio security is downgraded or the perceived creditworthiness of the issuer or guarantor deteriorates, though the effect of any credit rating downgrade can be uncertain. To the extent the Fund invests in below investment grade instruments, it will be exposed to a greater amount of credit risk than a fund which only invests in investment grade securities. In addition, to the extent the Fund uses credit derivatives, such use will expose it to additional risk in the event that the bonds underlying the derivatives default. The degree of credit risk depends on the issuer’s or guarantor’s financial condition and on the terms of the instruments.

DEPOSITARY RECEIPT RISK—The Fund may hold the securities of non-U.S. companies in the form of ADRs. The underlying securities of the ADRs in the Fund’s portfolio are subject to fluctuations in foreign currency exchange rates that may affect the value of the Fund’s portfolio. In addition, the value of the securities underlying the ADRs may change materially when the U.S. markets are not open for trading. Investments in the underlying foreign securities also involve political and economic risks distinct from those associated with investing in the securities of U.S. issuers.

DERIVATIVES RISK—The Fund’s investments in derivatives may pose risks in addition to and greater than those associated with investing directly in securities or other investments, including risks relating to leverage, imperfect correlations with underlying investments or the Fund’s 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. If the Advisor 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. Certain risks are specific to the derivatives in which the Fund invests.

SWAP AGREEMENTS RISK—Swap agreements are contracts among the Fund 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 transacted through a futures commission merchant and 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 central clearing. Central clearing is expected to reduce counterparty credit risk and increase liquidity, but central clearing does not make swap transactions risk-free.

FUTURES CONTRACTS RISK—Futures contracts are typically 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 securities. In addition, there is the risk that the Fund 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 Fund or the Advisor, thus limiting the ability to implement the Fund’s strategies. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s net asset value ("NAV"). Futures also are 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 to buy (or to sell) a position in a security or in a contract to the writer of the option, at a certain price. They are subject to correlation risk because there may be an imperfect correlation between the options and the securities markets that cause a given transaction to fail to achieve its objectives. The successful use of options depends on the Advisor’s ability to correctly predict future price fluctuations and the degree of correlation between the options and securities markets. Exchanges can limit the number of positions that can be held or controlled by the Fund or the Advisor, thus limiting the ability to implement the Fund’s strategies. Options also are particularly subject to leverage risk and can be subject to liquidity risk.

DISTRESSED SECURITIES RISK—The Fund may purchase or seek exposure to distressed securities of business enterprises involved in workouts, liquidations, reorganizations, bankruptcies and similar situations. Because there is typically substantial uncertainty concerning the outcome of transactions involving business enterprises in these situations, there is a high degree of risk of loss, including loss of the entire investment. In addition, distressed securities may be subject to periods of abrupt and erratic market movements and above-average price volatility. The market for distressed securities tends to be illiquid and as a result, distressed securities can be difficult to value.

EARLY CLOSING RISK—The Fund is subject to the risk that unanticipated early closings of securities exchanges and other financial markets may result in the Fund’s inability to buy or sell securities or other financial instruments on that day and may cause the Fund to incur substantial trading losses.

EQUITY RISK—The Fund is subject to the risk that the value of the equity securities and equity-based derivatives in the Fund’s portfolio will decline due to volatility in the equity market caused by general market and economic conditions, perceptions regarding particular industries represented in the equity market, or factors relating to specific companies to which the Fund has investment exposure.

EVENT DRIVEN STRATEGIES RISK—Generally, the success of event driven strategies depends on the successful prediction of whether various corporate events will occur or be consummated. Investing in companies in anticipation of an event carries the risk that the event may not happen or may take considerable time to unfold, it may happen in modified or conditional form, or the market may react differently than expected to the event, in which case the Fund may experience losses.

EXCHANGE-TRADED NOTES (ETNs) RISK—The value of an ETN may be influenced by time to maturity, level of supply and demand for the ETN, volatility and lack of liquidity in underlying commodities or securities markets, changes in the applicable interest rates, changes in the issuer's credit rating and economic, legal, political or geographic events that affect the referenced commodity or security. The Fund’s decision to sell its ETN holdings also may be limited by the availability of a secondary market. If the Fund must sell some or all of its ETN holdings and the secondary market is weak, it may have to sell such holdings at a discount. ETNs also are subject to counterparty credit risk and fixed income risk.

FOREIGN ISSUER EXPOSURE RISK—The Fund may invest in securities of foreign companies directly, or in financial instruments that are indirectly linked to the performance of foreign issuers. The Fund’s investments in foreign securities and foreign issuers are subject to additional risks in comparison to U.S. securities and U.S. issuers, including currency fluctuations, adverse political and economic developments, unreliable or untimely information, less liquidity, limited legal recourse and higher transactional costs.

HIGH YIELD AND UNRATED SECURITIES RISK—The Fund’s exposure to higher yielding, below investment grade and unrated high risk debt securities (commonly known as “junk bonds”) may present additional risk because these securities may be less liquid and present greater credit risk than investment grade bonds. The price of high yield securities tends to be subject to greater volatility due to issuer-specific operating results and outlook and to real or perceived adverse economic and competitive industry conditions. This exposure may be obtained through investments in other investment companies.

INTEREST RATE RISK—The market value of fixed income investments and related financial instruments will change in response to interest rate changes. During periods of falling interest rates, the values of fixed income securities generally rise. Conversely, during periods of rising interest rates, the values of such securities generally decline. Securities with greater interest rate sensitivity and longer maturities generally are subject to greater fluctuations in value. The Fund may invest in variable and floating rate securities. Although these instruments are generally less sensitive to interest rate changes than fixed rate instruments, the value of floating rate and variable securities may decline if their interest rates do not rise as quickly, or as much, as general interest rates. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates and the effect of potential government fiscal policy initiatives and resulting market reaction to those initiatives.

INVESTMENT IN INVESTMENT VEHICLES RISK—Investing in other investment vehicles, including ETFs, closed-end funds, affiliated short-term fixed income funds and other mutual funds, subjects the Fund 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 Fund and its shareholders will incur its pro rata share of the underlying vehicles’ expenses, which will reduce the Fund’s 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.

INVESTMENT IN LOANS RISK—Investing in loans involves special types of risks, including credit risk, interest rate risk, counterparty risk and prepayment risk. Loans may offer a fixed or floating interest rate. Loans are often generally below investment grade and may be unrated. Loans may be difficult to value and some can be subject to liquidity risk.

INVESTMENT TECHNIQUE RISK—Some investment techniques of the Fund, such as its use of derivatives and other financial instruments to seek to achieve its investment objective, may be considered aggressive.  These instruments may increase the volatility of the Fund and may involve a small investment of cash relative to the magnitude of the risk assumed. Such investment techniques may not consistently produce desired results and may be limited by legislative, regulatory, or tax developments.

LARGE-CAPITALIZATION SECURITIES RISK—The Fund is subject to the risk that large-capitalization stocks 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.

LEVERAGING RISK—The Fund’s investment in derivative instruments generally requires a small investment relative to the amount of investment exposure assumed.  As a result, such investments may give rise to losses that exceed the amount invested in those instruments. The cost of investing in such instruments generally increases as interest rates increase, which will lower the Fund’s return.

LIQUIDITY AND VALUATION RISK—In certain circumstances, it may be difficult for the Fund to purchase and sell a particular investment within a reasonable time at a fair price, or the price at which it has been valued by the Advisor for purposes of the Fund's NAV, causing the Fund to be less liquid. While the Fund intends to invest in liquid securities and financial instruments, under certain market conditions, such as when trading in a particular investment has been halted temporarily by an exchange because the maximum price change of that investment has been realized, it may be difficult or impossible for the Fund to liquidate such investments. In addition, the ability of the Fund to assign an accurate daily value to certain investments may be difficult, and the Advisor may be required to fair value the investments.

MANAGEMENT RISK—The Fund 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 Fund to fail to meet its investment objective or underperform its benchmark index or funds with similar investment objectives and strategies. Furthermore, active trading that can accompany active management, also called “high turnover,” may have a negative impact on performance. Active trading may result in higher brokerage costs or mark-up charges, which are ultimately passed on to shareholders of the Fund. Active trading also may result in adverse tax consequences.

MARKET RISK—The market value of the securities and derivatives held by the Fund may fluctuate over time in response to factors affecting individual companies or other factors such as changing economic, political or financial markets.

MID-CAPITALIZATION SECURITIES RISK—The Fund is subject to the risk that medium-capitalization stocks may underperform other segments of the equity market or the equity market as a whole. Securities of medium-capitalization companies may experience more price volatility, greater spreads between their bid and ask prices, lower trading volumes, and cyclical or static growth prospects. Medium-capitalization companies often have limited product lines, markets or financial resources, and may therefore be more vulnerable to adverse developments than larger capitalization companies.

NON-DIVERSIFICATION RISK—The Fund is considered non-diversified and can invest a greater portion of its assets in securities of individual issuers than a diversified fund. As a result, changes in the market value of a single issuer's securities could cause greater fluctuations in the value of Fund shares than would occur in a diversified fund.

OTC TRADING RISK—Certain of the derivatives in which the Fund may invest may be traded (and privately negotiated) in the OTC market. While the OTC derivatives market is the primary trading venue for many derivatives, it is largely unregulated and provides for less transparency than a national exchange. As a result and similar to other privately negotiated contracts, the Fund is subject to counterparty credit risk with respect to such derivatives contracts.

PORTFOLIO TURNOVER RISK—The Fund’s strategy may frequently involve buying and selling portfolio securities, which may lead to increased costs to the Fund. Portfolio turnover risk may cause the Fund’s performance to be less than you expect.

PREPAYMENT AND EXTENSION RISK—Prepayment risk is the risk that the principal on mortgage-backed securities, other asset-backed securities or any debt security with an embedded call option may be prepaid at any time, which could reduce the security’s yield and market value. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio manager may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. The rate of prepayments tends to increase as interest rates fall, which could cause the average maturity of the portfolio to shorten. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio manager may be unable to capitalize on securities with higher interest rates or wider spreads.

REPURCHASE AGREEMENT RISK—The Fund’s investment in repurchase agreements may be subject to market and credit risk with respect to the collateral securing the repurchase agreements. Investments in repurchase agreements also may be subject to the risk that the market value of the underlying obligations may decline prior to the expiration of the repurchase agreement term.

SHORT SALES 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 Fund 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 Fund’s ability to engage in short selling.

SMALL-CAPITALIZATION SECURITIES RISK—The Fund is subject to the risk that small-capitalization stocks may underperform other segments of the equity market or the equity market as a whole. Small-capitalization companies may be more vulnerable than larger, more established organizations to adverse business or economic developments. Securities of small-capitalization companies may experience much more price volatility, greater spreads between their bid and ask prices, significantly lower trading volumes, and cyclical or static growth prospects. Small-capitalization companies often have limited product lines, markets or financial resources, and may therefore be more vulnerable to adverse developments than larger capitalization companies.

TRADING HALT RISK—The Fund typically will hold short-term options and futures contracts. The major exchanges on which these contracts are traded, such as the Chicago Mercantile Exchange, have established limits on how much the trading price of an option or futures contract may decline over various time periods within a day, and may halt trading in a contract that exceeds such limits. If a trading halt occurs, the Fund may temporarily be unable to purchase or sell certain securities, options or futures contracts. Such a trading halt near the time the Fund prices its shares may prevent the Fund from achieving its investment objective.

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] rr_RiskLoseMoney As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund is considered non-diversified and can invest a greater portion of its assets in securities of individual issuers than a diversified fund. As a result, changes in the market value of a single issuer's securities could cause greater fluctuations in the value of Fund shares than would occur in a diversified fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart shows the performance of the Class P shares of the Fund from year to year. The variability of performance over time provides an indication of the risks of investing in the Fund. The following table shows the performance of the Class P shares of the Fund as an average over different periods of time in comparison to the performance of a broad-based market index and the Credit Suisse Event Driven Liquid Index. Effective upon the close of business on April 30, 2015, the Fund converted its existing Class H shares to Class P shares. For periods prior to May 1, 2015, the performance shown reflects the performance of Class H shares. The returns shown have not been adjusted to reflect any differences in expenses between Class H shares and Class P shares. However, the Fund's Class P shares would have had annual returns substantially similar to those of the Fund's former Class H shares because they are invested in the same portfolio of securities and have a similar, if not identical, expense structure to that of Class H shares. The figures in the bar chart and table assume the reinvestment of dividends and capital gains distributions. Of course, this past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

Updated performance information is available on the Fund’s website at www.guggenheiminvestments.com or by calling 800.820.0888.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the performance of the Class P shares of the Fund from year to year. The variability of performance over time provides an indication of the risks of investing in the Fund. The following table shows the performance of the Class P shares of the Fund as an average over different periods of time in comparison to the performance of a broad-based market index and the Credit Suisse Event Driven Liquid Index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.820.0888
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.guggenheiminvestments.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Of course, this past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
The performance information shown below for Class P shares is based on a calendar year. The year-to-date return for the period from January 1, 2018 through June 30, 2018 is -1.41%.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest Quarter Return
 
Lowest Quarter Return
 
Q4 2011
7.95%
 
Q3 2011
-10.94
 %
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURN (for periods ended December 31, 2017)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
RYDEX SERIES FUND CLASS P | Guggenheim Event Driven and Distressed Strategies Fund | S&P 500 Index  
Prospectus: rr_ProspectusTable  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses or taxes
Label rr_AverageAnnualReturnLabel S&P 500® Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 15.79%
Since Inception rr_AverageAnnualReturnSinceInception 15.97%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2010
RYDEX SERIES FUND CLASS P | Guggenheim Event Driven and Distressed Strategies Fund | Credit Suisse Event Driven Liquid Index  
Prospectus: rr_ProspectusTable  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses or taxes
Label rr_AverageAnnualReturnLabel Credit Suisse Event Driven Liquid Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 6.11%
5 Years rr_AverageAnnualReturnYear05 3.48%
Since Inception rr_AverageAnnualReturnSinceInception 5.39%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2010
RYDEX SERIES FUND CLASS P | Guggenheim Event Driven and Distressed Strategies Fund | Class P  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol RYDSX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.88% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.07%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.10% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.98% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 201
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 646
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,118
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,422
Annual Return 2011 rr_AnnualReturn2011 (1.04%)
Annual Return 2012 rr_AnnualReturn2012 8.35%
Annual Return 2013 rr_AnnualReturn2013 11.48%
Annual Return 2014 rr_AnnualReturn2014 (3.13%)
Annual Return 2015 rr_AnnualReturn2015 (3.06%)
Annual Return 2016 rr_AnnualReturn2016 8.44%
Annual Return 2017 rr_AnnualReturn2017 5.99%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (1.41%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.95%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.94%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.99%
5 Years rr_AverageAnnualReturnYear05 3.77%
Since Inception rr_AverageAnnualReturnSinceInception 5.00%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2010
RYDEX SERIES FUND CLASS P | Guggenheim Event Driven and Distressed Strategies Fund | Class P | After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 4.65%
5 Years rr_AverageAnnualReturnYear05 2.25%
Since Inception rr_AverageAnnualReturnSinceInception 3.46%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2010
RYDEX SERIES FUND CLASS P | Guggenheim Event Driven and Distressed Strategies Fund | Class P | After Taxes on Distributions and Sales  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.38%
5 Years rr_AverageAnnualReturnYear05 2.24%
Since Inception rr_AverageAnnualReturnSinceInception 3.25%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2010
[1] "Other Expenses” does not include fees paid to the Fund’s swap contract counterparties, or the management fees, performance fees, and expenses of the reference assets or trading vehicles underlying such swap contracts. These fees and expenses, which are not reflected in this Annual Fund Operating Expenses table, are embedded in the return of the swap contracts (i.e., the fees and expenses reduce the investment return of the swap contract) and represent an indirect cost of investing in the Fund.
[2] "Other Expenses” does not include fees paid to the Fund’s swap contract counterparties, or the management fees, performance fees, and expenses of the reference assets or trading vehicles underlying such swap contracts. These fees and expenses, which are not reflected in this Annual Fund Operating Expenses table, are embedded in the return of the swap contracts (i.e., the fees and expenses reduce the investment return of the swap contract) and represent an indirect cost of investing in the Fund.
[3] The Total Annual Fund Operating Expenses in this fee table (before and after any fee waivers and/or expense reimbursements) may not correlate to the expense ratios in the Fund’s financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.
[4] The Advisor has contractually agreed to reduce fees and/or reimburse expenses to the extent necessary to keep net operating expenses for Class P shares (including Rule 12b-1 fees (if any), but exclusive of brokerage costs, dividends on securities sold short, expenses of other investment companies in which the Fund invests, interest, taxes, litigation, indemnification, and extraordinary expenses (as determined under generally accepted accounting principles) (“Excluded Expenses”)) from exceeding 1.90% of the Fund’s Class P shares average daily net assets. The Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement includes Excluded Expenses and, thus, from time to time may be higher than 1.90%. This Agreement may be terminated only with the approval of the Fund’s Board of Trustees. In any event, this undertaking will continue for at least twelve months from the date of this Prospectus.