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Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Aug. 01, 2011
Inverse Europe 2x Strategy Fund (Second Prospectus Summary) | Inverse Europe 2x Strategy Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading INVERSE EUROPE 2x STRATEGY FUND
Risk/Return, Supplement Text Block ck0000899148_SupplementTextBlock 
IMPORTANT INFORMATION ABOUT THE FUND - The Inverse Europe 2x Strategy Fund (the
"Fund") is very different from most other mutual funds in that it seeks to
provide daily leveraged investment results that correlate to the opposite of the
performance of a specific benchmark on a daily basis, a result opposite of most
mutual funds. As a result, the Fund may be riskier than alternatives that do not
use leverage because the performance of an investment is magnified.

The effect of leverage on the Fund will generally cause the Fund's performance
to not correlate to the performance of the Fund's benchmark (as defined below)
over a period of time greater than one day. This means that the return of the
Fund for a period of longer than a single trading day will be the result of each
day's compounded returns over the period, which will very likely differ from
twice the inverse return of the Fund's underlying index (as defined below) for
that period. As a consequence, especially in periods of market volatility, the
path or trend of the benchmark during the longer period may be at least as
important to the Fund's cumulative return for the longer period as the
cumulative return of the benchmark for the relevant longer period. Further, the
return for investors who invest for a period longer than a single trading day
will not be the product of the return of the Fund's stated investment goal
(e.g., -2x) and the cumulative performance of the underlying index (as defined
below).

The Fund is not suitable for all investors. The Fund should be utilized only by
investors who (a) understand the risks associated with the use of leverage,
(b) understand the consequences of seeking daily leveraged investment results,
(c) understand the risk of shorting and (d) intend to actively monitor and
manage their investments. Investors who do not meet these criteria should not
buy shares of the Fund. An investment in the Fund is not a complete investment
program.
Investment Objective, Heading rr_ObjectiveHeading INVESTMENT OBJECTIVE -
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The Fund seeks to provide investment results that correlate, before fees and expenses,
to the performance of a specific benchmark. The Fund's current benchmark is 200% of the
inverse (opposite) of the fair value of the Dow Jones STOXX 50 IndexSM (the "underlying
index"). The Fund does not seek to achieve its investment objective over a period of
time greater than one day.
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 or C-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 ___ of this Prospectus and in the
"A-Class Shares - Initial Sales Charges, Reductions, and Waivers" section
beginning on page ___ 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. 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. The Fund is new, and
therefore, does not have a historical portfolio turnover rate.
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
Other Expenses, New Fund, Based on Estimates rr_OtherExpensesNewFundBasedOnEstimates Because the Fund is new, "Other Expenses" are based on estimated amounts for the current fiscal year.
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 employs as its investment strategy a program of engaging in short sales
of securities generally included in the underlying index and investing in leveraged
derivatives instruments, which primarily consist of equity index swaps, futures
contracts, and options on securities, futures contracts, and stock indices. Equity
index swaps, short sales, and futures and options contracts enable the Fund to
pursue its objective without selling short each of the securities included in the
underlying index. The Fund may also invest in exchange-traded funds ("ETFs") that
provide exposure to emerging market countries and in American Depositary Receipts
("ADRs") to gain exposure to the underlying index. 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. Under normal circumstances, the Fund will invest at least 80% of its
net assets, plus any borrowings for investment purposes, in financial
instruments with economic characteristics that should perform opposite to the
securities of companies included in the underlying index. The Dow Jones Stoxx 50
IndexSMis a capitalization-weighted index composed of 50 European blue chip
stocks. Index members are chosen by Stoxx Ltd. from 16 countries under criteria
designed to identify highly liquid companies that are leaders in their sectors.
As of [date], the Dow Jones Stoxx 50 IndexSM included companies with a capitalization
range of $___ billion to $___ billion. Certain of the Fund's derivative investments
may be traded in the over-the-counter ("OTC") market. On a day-to-day basis, the Fund
may hold U.S. government securities or cash equivalents to collateralize its short
sales and derivative positions. . 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. To the extent the
underlying index is concentrated in a particular industry the Fund will
necessarily be concentrated in that industry. 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 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:

ACTIVE TRADING RISK - Active trading, also called "high portfolio turnover," may
result in higher brokerage costs or mark-up charges, which may negatively affect
Fund performance and result in short-term capital gains, which have a negative
tax effect. Large movements of assets into and out of the Fund due to active
trading also may adversely affect the Fund's ability to achieve its investment
objective.

CORRELATION AND COMPOUNDING RISK - A number of factors may affect the Fund's
ability to achieve a high degree of correlation with its benchmark, and there
can be no guarantee that the Fund will achieve a high degree of correlation.
Failure to achieve a high degree of correlation may prevent the Fund from
achieving its investment objective. The risk of the Fund not achieving its
investment objective will be more acute when the underlying index has an extreme
one-day movement approaching 50%. In addition, as a result of compounding and
the times at which the Fund and the underlying index calculate their respective
NAVs, the Fund's performance is likely to be either greater than or less than
the performance of the underlying index times the stated multiple in the Fund's
investment objective, before accounting for fees and fund expenses.

Compounding affects all investments, but has a more significant impact on a
leveraged index fund. In general, particularly during periods of higher index
volatility, compounding will cause longer-term results to be more or less than
the return of the Fund's benchmark. This effect becomes more pronounced as
volatility increases.

Fund performance for periods greater than one day can be estimated given any set
of assumptions for the following factors: (a) underlying index performance;
(b) underlying index volatility; (c) financing rates associated with leverage;
(d) other Fund expenses; (e) dividends paid by companies in the underlying
index; and (f) period of time. The chart below illustrates the impact of two
principal factors - volatility and index performance - on Fund performance. The
chart shows estimated Fund returns for a number of combinations of performance
and volatility over a one-year period. Performance shown in the chart assumes:
(a) no dividends paid by the companies included in the underlying index; (b) no
Fund expenses; and (c) a cost of leverage of zero percent. If Fund expenses were
included, the Fund's performance would be lower than shown.

Areas shaded lighter represent those scenarios where the Fund can be expected to
return more than twice the inverse performance of the underlying index;
conversely, areas shaded darker represent those scenarios where the Fund can be
expected to return the same or less than twice the performance of the underlying
index.

Index Performance                    Annualized Volatility
1x           -2x        1x        -2x        1x        -2x        1x
-60 %        120 %     -60 %      120 %     -60 %      120 %     -60 %
-50 %        100 %     -50 %      100 %     -50 %      100 %     -50 %
-40 %         80 %     -40 %       80 %     -40 %       80 %     -40 %
-30 %         60 %     -30 %       60 %     -30 %       60 %     -30 %
-20 %         40 %     -20 %       40 %     -20 %       40 %     -20 %
-10 %         20 %     -10 %       20 %     -10 %       20 %     -10 %
 0 %          0 %       0 %        0 %       0 %        0 %       0 %
 10 %        -20 %      10 %      -20 %      10 %      -20 %      10 %
 20 %        -40 %      20 %      -40 %      20 %      -40 %      20 %
 30 %        -60 %      30 %      -60 %      30 %      -60 %      30 %
 40 %        -80 %      40 %      -80 %      40 %      -80 %      40 %
 50 %       -100 %      50 %     -100 %      50 %     -100 %      50 %
 60 %       -120 %      60 %     -120 %      60 %     -120 %      60 %

The underlying index's annualized historical volatility rate for the five year
period ended June 30, 2011 is ___%. The underlying index's highest one-year
volatility rate during the five year period is ____%. The underlying index's
annualized performance for the five year period ended June 30, 2011 is ____%.
Historical underlying index volatility and performance are not indications of
what the underlying index volatility and performance will be in the future.

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.

CURRENCY RISK - The Fund's indirect and direct exposure to foreign currencies
subjects the Fund to the risk that those currencies will decline in value
relative to the U.S. Dollar, or, in the case of short positions, that the U.S.
Dollar will decline in value relative to the currency being hedged. The Fund
also may incur transaction costs in connection with conversions between various
currencies.

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 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.

EMERGING MARKETS RISK - The Fund's investments may have exposure to emerging
markets. Emerging markets can be subject to greater social, economic,
regulatory, and political uncertainties and can be extremely volatile because
they are countries or markets with low- to middle-income economies as classified
by the World Bank, and other countries or markets with similar characteristics
as determined by the Advisor.

FOREIGN ISSUER EXPOSURE RISK - The Fund may invest in securities of foreign
companies directly, or in financial instruments, such as ADRs, that are
indirectly linked to the performance of foreign issuers. Foreign securities
markets generally have less trading volume and less liquidity than U.S. markets,
and prices in some foreign markets may fluctuate more than those of securities
traded on U.S. markets.

GEOGRAPHIC CONCENTRATION IN EUROPE RISK - Because a significant portion of the
assets of the Fund are invested in a specific geographical region, the value of
its investments and the net asset value of the Fund could decline more
dramatically as a result of adverse events affecting Europe. In addition,
countries in Europe may be significantly affected by the tight fiscal and
monetary controls of the European Economic and Monetary Union (EMU).

INVESTMENT IN INVESTMENT COMPANIES RISK - Investing in other investment
companies 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.

LEVERAGING RISK -The Fund achieves leveraged exposure to the underlying index
through the use of derivative instruments. The more the Fund invests in
leveraged instruments, the more this leverage will magnify any losses on those
investments. The Fund's investment in these 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. Since the Fund's investment strategy involves consistently
applied leverage, the value of the Fund's shares will tend to increase or
decrease more than the value of any increase or decrease in the underlying
index. Leverage also will have the effect of magnifying tracking error.

LIQUIDITY RISK - In certain circumstances, it may be difficult for the Fund to
purchase and sell particular investments within a reasonable time at a fair
price. 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.

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.

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 security
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. As a result and similar to other privately negotiated
contracts, the Fund is subject to counterparty credit risk with respect to such
derivative contracts.

PASSIVE INVESTMENT RISK - The Fund is not actively managed and the Advisor does
not attempt to take defensive positions in declining markets. Therefore, the
Fund may be subject to greater losses in a declining market than a fund that is
actively managed.

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.

SHORT SALES RISK - Short selling a security involves selling a borrowed security
with the expectation that the value of the security will decline, so that the
security may be purchased at a lower price when returning the borrowed security.
The risk for loss on short selling is greater than the original value of the
securities sold short because the price of the borrowed security may rise,
thereby increasing the price at which the security must be purchased. Government
actions also may affect the Fund's ability to engage in short selling.

STATUS AS A REGULATED INVESTMENT COMPANY RISK - The Fund may realize gains from
the sale or other disposition of foreign currencies and other income (including
gains from options, futures or forward contracts) derived from investing in
stock, securities, or foreign currencies. The Secretary of the Treasury is
authorized to issue regulations that might cause the Fund, as a result of its
realization of such foreign currency gains, to fail to qualify as a regulated
investment company. As of the date of this Prospectus, no regulations have been
issued pursuant to this authorization, but such regulations may be issued in the
future.

TRACKING ERROR RISK - The Advisor may not be able to cause the Fund's
performance to correlate to that of the Fund's benchmark, either on a daily or
aggregate basis. Factors such as Fund expenses, imperfect correlation between
the Fund's investments and those of the underlying index, rounding of share
prices, changes to the composition of the underlying index, regulatory policies,
high portfolio turnover rate, and the use of leverage all contribute to tracking
error. Tracking error 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.
Risk, Nondiversified Status 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 security 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 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 has not yet commenced operations and, therefore, does not have
any performance history. Of course, once the Fund has performance for a full
calendar year, this past performance (before and after taxes) does not necessarily
indicate how the Fund will perform in the future.
Performance, One Year or Less rr_PerformanceOneYearOrLess 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 has not yet commenced operations and, therefore, does not have any performance history.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture Of course, once the Fund has performance for a full calendar year, this past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Inverse Europe 2x 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  
Distribution (12b-1) and/or Shareholder Service Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets   [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets  
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01  
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03  
Inverse Europe 2x 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  
Distribution (12b-1) and/or Shareholder Service Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets   [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets  
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01  
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03  
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01  
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03  
[1] Because the Fund is new, "Other Expenses" are based on estimated amounts for the current fiscal year.