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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Aug. 01, 2011
Long Short Interest Rate Strategy Fund (Second Prospectus Summary) | Long Short Interest Rate Strategy Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading LONG SHORT INTEREST RATE STRATEGY FUND
Investment Objective, Heading rr_ObjectiveHeading INVESTMENT OBJECTIVE -
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The Long Short Interest Rate Strategy Fund (the "Fund") seeks to maximize total
return by taking advantage of price movements in the U.S. Treasury bond market.
Expense, Heading rr_ExpenseHeading FEES AND EXPENSES OF THE FUND -
Expense, Narrative rr_ExpenseNarrativeTextBlock 
This table describes the fees and expenses that you may pay if you buy and hold
A-Class Shares, C-Class Shares or Institutional Class Shares of the Fund. You
may qualify for sales charge discounts if you and your family invest, or agree
to invest in the future, at least $100,000 in certain Rydex|SGI Funds. More
information about these and other discounts is available from your financial
professional and under the "Sales Charges" section on page 306 of the Prospectus
and in the "A-Class Shares - Initial Sales Charges, Reductions, and Waivers"
section beginning on page 108 of the Fund's Statement of Additional Information
(the "SAI").
Shareholder Fees, Caption rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses, Caption 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 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
Total Annual Fund Operating Expenses or in the Example, affect the Fund's
performance. During the most recent fiscal year, the Fund's portfolio turnover
rate was 0% of the average value of its portfolio. However, the Fund's
portfolio turnover rate is calculated without regard to cash instruments
or derivatives. If such instruments were included, the Fund's portfolio
turnover rate might be significantly higher.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 0.00%
Expense Breakpoint, Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in certain Rydex|SGI Funds.
Expense Breakpoint, Minimum Investment Required Amount rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example, Heading rr_ExpenseExampleHeading EXAMPLE -
Expense Example, Narrative 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.

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:
Expense Example, No Redemption, By Year, Caption rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Investment Strategy, Heading rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES -
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock 
The Fund seeks to achieve its investment objective by investing in accordance
with a highly quantitative investment model that is designed to identify a
short-term interest rate outlook expressed in terms of exposure to the U.S.
Treasury bond market. It is expected that the model will enable the Fund to
potentially benefit from interest rate trends while also enabling it to
take advantage of short-term deviations in such trends.

In executing this strategy, the Fund's Sub-Advisor manages the investment model
to determine an interest rate outlook. The model evaluates and ranks factors in
3 primary categories: (1) economic outlook based on various macro-economic factors;
(2) inflationary expectations based on such factors as
precious metals, commodities and other price movements; and (3) investor
psychology as demonstrated by the level of market reaction not explained by the
economic outlook and inflationary expectations. The interest rate outlook
generated by the model determines the portfolio's target duration ranging from
fully bullish, with a target duration of 11 years, to fully bearish, with a
target duration of negative 11 years. If the outlook is indeterminate, the
Advisor will target a neutral portfolio duration of approximately 5.5 years. A
neutral portfolio seeks to generate a return that is representative of the
return of the overall Treasury market. Intermediate levels also may be
established based on the interest rate outlook. The Sub-Advisor sends the
model's signals to the Advisor and the Advisor reviews the rate outlook
determined by the model monthly to both manage risk and to seek to take
advantage of short-term deviations in the general business cycle trend in
interest rates.

On a day-to-day basis, the Fund invests substantially all of its net assets in
cash, U.S. Treasury Bills, Notes, and Bonds as well as futures linked to those
instruments, and exchange-traded funds ("ETFs"). The Fund also may invest in
options, futures and swap agreements for hedging and non-hedging purposes, such
as to manage the effective duration of the portfolio or as a substitute for
direct investment. By focusing primarily on U.S. Treasury securities and
Treasury-related futures and ETFs, the strategy minimizes or eliminates the
risks (prepayment, currency, liquidity, etc.) inherent in many other fixed
income management approaches. 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. 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.
Risk, Heading rr_RiskHeading PRINCIPAL RISKS -
Risk, Narrative 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
a number of additional risks that may affect the value of its shares, including:

Counterparty Credit Risk - The Fund may make investments 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, if a swap agreement counterparty defaults on its payment
obligations to the Fund, this default will cause the value of your investment in
the Fund to decrease. Swap agreements also may be considered to be illiquid.

Derivatives Risk - The Fund's investments in derivatives may pose risks in
addition to those associated with investing directly in securities or other
investments, including illiquidity of the derivatives, imperfect correlations
with underlying investments or the Fund's other portfolio holdings, lack of
availability and counterparty 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.

Fixed Income Risk - The Fund's investments in fixed income securities will
change in value in response to interest rate changes and other factors, such as
the perception of the issuer's creditworthiness. For example, the value of fixed
income securities will generally decrease when interest rates rise, which may
cause the value of the Fund to decrease. In addition, the Fund's investments in
fixed income securities with longer maturities will fluctuate more in response
to interest rate changes.

Investment in Investment Companies Risk - Investing in other investment
companies, including ETFs, subjects the Fund to those risks affecting the
investment company, including the possibility that the value of the underlying
securities held by the investment company could decrease. Moreover, the Fund
will incur its pro rata share of the expenses of the underlying investment
companies' expenses.

Investment Technique Risk - Some investment techniques of the Fund may be
considered aggressive. Risks associated with the use of futures contracts,
options, structured notes, and swap agreements include potentially dramatic
price changes (losses) in the value of the instruments and imperfect
correlations between the price of the contract and the underlying security or
index. 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.

Market Risk - The Fund's investments in securities and derivatives, in general,
are subject to market risks that may cause their prices, and therefore the
Fund's value, to fluctuate over time. An investment in the Fund may lose money.

Portfolio Turnover Risk - The Fund's strategy may frequently involve buying and
selling portfolio securities to rebalance the Fund's exposure to various market
sectors. Higher portfolio turnover may result in the Fund paying higher levels
of transaction costs and generating greater tax liabilities for shareholders.
Portfolio turnover risk may cause the Fund's performance to be less than you
expect.

Trading Halt Risk - If a trading halt occurs, the Fund may temporarily be unable
to purchase or sell securities, options or futures contracts. Such a trading
halt near the time the Fund prices its shares may limit the Fund's ability to
use leverage and may prevent the Fund from achieving its investment objective.
Risk, Lose Money rr_RiskLoseMoney As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading PERFORMANCE INFORMATION -
Performance, Narrative rr_PerformanceNarrativeTextBlock 
A comparison of the Fund's performance with that of a broad measure of market
performance may give some indication of the risks of an investment in the Fund;
however, the Fund is new and, therefore, does not have a performance history
for a full calendar year. Of course, once the Fund has performance, 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
rydex-sgi.com or by calling Rydex|SGI Client Services at 800-820-0888.
Performance, One Year or Less rr_PerformanceOneYearOrLess however, the Fund is new and, therefore, does not have a performance history for a full calendar year.
Performance, Availability Phone Number rr_PerformanceAvailabilityPhone 800-820-0888
Performance, Availability Website Address rr_PerformanceAvailabilityWebSiteAddress rydex-sgi.com
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture Of course, once the Fund has performance, this past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Long Short Interest Rate Strategy Fund | A-Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum Deferred Sales Charge (Load) (as a percentage of initial purchase price or current market value, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution or Shareholder Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.54%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.54%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 624
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 938
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,275
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,222
Long Short Interest Rate Strategy Fund | C-Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of initial purchase price or current market value, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution or Shareholder Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.55%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.30%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 333
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 718
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,230
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,636
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 233
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 718
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,230
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,636
Long Short Interest Rate Strategy Fund | Institutional Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of initial purchase price or current market value, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution or Shareholder Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.55%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.30%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 132
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 713
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,568