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Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Aug. 01, 2011
Inverse High Yield Strategy Fund (First Prospectus Summary) | Inverse High Yield Strategy Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading INVERSE HIGH YIELD STRATEGY FUND
Risk/Return, Supplement Text Block ck0000899148_SupplementTextBlock 
IMPORTANT INFORMATION ABOUT THE FUND - The Inverse High Yield Strategy Fund (the
"Fund") is very different from most other mutual funds in that it seeks to
provide investment results that correlate to the opposite of the performance of
the high yield bond market, a result opposite of most mutual funds. The Fund may
be riskier than alternatives that do not rely on the use of derivatives to
achieve their investment objectives.

Because the Fund seeks daily inverse investment results, 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 the
inverse of the return of the high yield bond market for that period. As a
consequence, especially in periods of market volatility, the path or trend of
the high yield bond market during the longer period may be at least as important
to the Fund's return for the longer period as the cumulative return of the high
yield bond market 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., -1x) and
the cumulative performance of the high yield bond market.

The Fund is not suitable for all investors. The Fund should be utilized only by
investors who (a) understand the risk of shorting and (b) 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 inversely correlate, before fees
and expenses, to the performance of the high yield 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
H-Class Shares of the Fund.
Shareholder Fees, Caption rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment) N/A
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 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:
Investment Strategy, Heading rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock 
The Fund seeks to gain inverse exposure to the performance of the high yield bond
market by investing in credit default swaps, futures and other financial instruments
with economic characteristics opposite to that of the high yield bond market as
represented by U.S. and Canadian high yield bonds. Generally, high yield bonds,
which are also commonly referred to as "junk bonds," are those bonds rated BB+
and lower by Standard & Poor's Rating Service or Ba1 and lower by Moody's
Investor Services, Inc., but may include unrated bonds that the Advisor determines
are of similar quality. The Advisor  will consider the liquidity, transaction
costs and relative value of available investments in seeking to meet the Fund's
objective.

The Fund will primarily invest in credit default swaps to gain inverse exposure
to the high yield bond market. Credit default swaps are instruments which allow
for the full or partial transfer of third party credit risk, with respect to a
particular entity or entities, from one counterparty to the other. A buyer of
credit default swaps is buying credit protection or mitigating credit risk. A
seller of credit default swaps is selling credit protection or assuming credit
risk. The Fund will normally be a buyer of credit protection as it seeks to gain
inverse exposure to the high yield bond market, but may also sell credit
protection (assuming credit risk) from time to time in order to maintain the
appropriate level of exposure to the high yield bond market, such as during
times of heavy redemption activity.

In addition, the Fund may invest in bond futures for the purpose of managing
duration risk. For cash management purposes, the Fund may invest in other fixed
income securities and money market instruments. The Fund may also invest in
other financial instruments including corporate notes, convertible debt
securities, preferred securities and derivatives thereof, as well as other
investment companies, including exchange-traded funds, unit investment trusts,
and closed-end funds, that provide inverse exposure to the high yield debt
market. 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. Certain of the
Fund's derivative investments may be traded in the over-the-counter ("OTC")
market. 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 is non-diversified and,
therefore, may invest a greater percentage of its assets in a particular issuer
in comparison to a diversified fund.

Under normal circumstances, the Fund will invest at least 80% of its net assets,
plus any borrowings for investment purposes, in financial instruments that in
combination should provide inverse exposure to the U.S. and Canadian high yield
bond markets.
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 high yield bond market
experiences extreme volatility. In addition, as a result of compounding, the
Fund's performance is likely to be either greater than or less than the inverse
performance of the high yield bond market, before accounting for fees and fund
expenses.

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.
Similarly, if the credit quality of an issuer or guarantor of a debt instrument
improves, this change may adversely affect the value of the Fund's investment.

Credit Risk - Changes in an issuer's financial strength or in an issuer's or
debt security's credit rating may affect a Security's value and thus have an
impact on Fund performance.

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.

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.

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. 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.

High Yield Risk - The Fund may invest in high yield securities and unrated
securities of similar credit quality (commonly known as "junk bonds"), which may
be subject to greater levels of interest rate, credit and liquidity risk than
funds that do not invest in such securities.

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 - The Advisor does not engage in temporary defensive
investing, keeping the Fund fully invested in all market environments. This
means that, based on market and economic conditions, the Fund's performance
could be lower than other types of mutual funds that may actively shift their
portfolio assets to lessen the impact of a market decline.

Issuer Specific Risk - The value of a security may increase or decrease for a
number of reasons which directly relate to the issuer. For example, with respect
to the Fund, perceived poor management performance, financial leverage or
reduced demand of the issuer's goods or services may contribute to a decrease in
the value of a security. A decrease in the value of the securities of an issuer
or guarantor of a debt instrument may cause the value of your investment in the
Fund to decrease.

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.

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.

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 
The following bar chart shows the performance of the H-Class 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 H-Class Shares of the Fund as an average over different periods of time in
comparison to the performance of a broad-based market index. 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.rydex-sgi.com or by calling Rydex|SGI Client Services at 800-820-0888.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The variability of performance over time provides an indication of the risks of investing in the Fund.
Performance, Availability Phone Number rr_PerformanceAvailabilityPhone 800-820-0888
Performance, Availability Website Address rr_PerformanceAvailabilityWebSiteAddress www.rydex-sgi.com
Performance, Past Does Not Indicate Future 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 rr_BarChartNarrativeTextBlock 
The performance information shown below for H-Class Shares is based on a calendar year.
The year-to-date return for the period from January 1, 2011 through June 30, 2011 is -6.38%.
Bar Chart, Closing rr_BarChartClosingTextBlock 
Highest Quarter Return                      Lowest Quarter Return
(quarter ended 3/31/2009) 10.37%   (quarter ended 9/30/2009) -10.88%
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses or taxes
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.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURN (for periods ended December 31, 2010)
Inverse High Yield Strategy Fund (First Prospectus Summary) | Inverse High Yield Strategy Fund | H-Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return for the period
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (6.38%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.88%)
Inverse High Yield Strategy Fund | Barclays Capital U.S. Corporate High Yield Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Barclays Capital U.S. Corporate High Yield Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.12%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.95%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Apr. 16, 2007
Inverse High Yield Strategy Fund | H-Class Shares
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) and/or Shareholder Service Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.53%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.53%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 156
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 483
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 834
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,824
Annual Return 2008 rr_AnnualReturn2008 2.97%
Annual Return 2009 rr_AnnualReturn2009 (19.17%)
Annual Return 2010 rr_AnnualReturn2010 (18.24%)
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (18.24%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (9.95%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Apr. 16, 2007
Inverse High Yield Strategy Fund | H-Class Shares | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (18.24%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (10.23%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Apr. 16, 2007
Inverse High Yield Strategy Fund | H-Class Shares | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (11.86%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (8.38%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Apr. 16, 2007