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Risk Return [Abstract] rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Aug. 01, 2012
Strengthening Dollar 2x Strategy Fund (First Prospectus Summary) | Strengthening Dollar 2x Strategy Fund
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Strengthening Dollar 2x Strategy Fund
Risk/Return, Supplement Text Block ck0000899148_SupplementTextBlock IMPORTANT INFORMATION ABOUT THE FUND

The Strengthening Dollar 2x Strategy Fund (the "Fund") is very different from
most other mutual funds in that it seeks daily leveraged investment results. As
a result, the Fund may be riskier than alternatives that do not use leverage
because the performance of an investment in the Fund is magnified.

The effect of leverage on the Fund will generally cause the Fund's performance
to not match the performance of the Fund's benchmark (as described 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
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,
and (c) 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.
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide investment results that match the performance of a
specific benchmark, before fees and expenses, on a daily basis. The Fund's
current benchmark is 200% of the performance of the U.S. Dollar Index® (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 [Text Block] 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 [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment) N/A
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
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 [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.

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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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 employs as its investment strategy a program of investing in derivative
instruments, which primarily consist of equity index swaps, futures contracts,
and options on securities, securities indices, and futures contracts. Investing
in derivative instruments enables the Fund to pursue its investment objective
without investing directly in the securities included in the underlying index or
in the same proportion that those securities are represented in the underlying
index. The Fund's use of derivatives and the leveraged investment exposure
created by such use is expected to be significant. Certain of the Fund's
derivative investments may be traded in the over-the-counter ("OTC") market. The
U.S. Dollar Index® measures the performance of the U.S. dollar against a basket
of foreign currencies that include the Euro, Japanese Yen, British Pound,
Canadian Dollar, Swedish Krona and Swiss Franc. On a day-to-day basis, the Fund
may hold U.S. government securities or cash equivalents to collateralize its
derivative 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 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 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 daily
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, the
Fund's performance for periods greater than one day 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 performance of the underlying index; conversely,
areas shaded darker represent those scenarios where the Fund can be expected to
return less than twice the performance of the underlying index.

               Index Performance                      Annualized Volatility                 
                1x            2x         10%        25%        50%        75%        100%   
                  -60%        -120%       -84%       -85%       -88%       -91%       -94%  
                  -50%        -100%       -75%       -77%       -81%       -86%       -91%  
                  -40%         -80%       -65%       -66%       -72%       -80%       -87%  
                  -30%         -60%       -52%       -54%       -62%       -72%       -82%  
                  -20%         -40%       -37%       -41%       -49%       -64%       -78%  
                  -10%         -20%       -20%       -24%       -37%       -55%       -71%  
                    0%           0%        -1%        -5%       -22%       -43%       -65%  
                   10%          20%        19%        14%        -5%       -31%       -58%  
                   20%          40%        42%        36%        11%       -15%       -47%  
                   30%          60%        67%        59%        32%        -3%       -38%  
                   40%          80%        93%        84%        52%        11%       -28%  
                   50%         100%       122%       111%        76%        28%       -20%  
                   60%         120%       154%       140%       100%        44%       -10%  

The underlying index's annualized historical volatility rate for the five year
period ended June 30, 2012 is 10.55%. The underlying index's highest one-year
volatility rate during the five year period is 15.67%. The underlying index's
annualized performance for the five year period ended June 30, 2012 is -0.07%.

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 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, 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.

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. When used to generate leveraged exposure,
the Fund's investments in derivatives may expose the Fund to potentially
dramatic losses (or gains) in the value of the derivative instruments. The Fund
could lose more than the principal amount invested.

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.

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. While the Fund only intends to invest in liquid futures, options,
forwards and swap contracts, under certain market conditions, such as when the
market makes a "limit move," 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.

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.

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.

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 match 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 [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 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 [Text Block] 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
average annual total returns of the H-Class Shares of the Fund 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 Guggenheim Investments Client Services at
800.820.0888.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The variability of performance over time provides an indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.820.0888
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.rydex-sgi.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 H-Class Shares is based on a
calendar year. The year-to-date return for the period from January 1, 2012
through June 30, 2012 is -0.14%.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock        Highest Quarter Return                         Lowest Quarter Return
       (quarter ended 9/30/2008) 17.18%   (quarter ended 9/30/2010) -17.58%
Index No Deduction for Fees, Expenses, Taxes [Text] 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.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURN (for periods ended December 31, 2011)
Strengthening Dollar 2x Strategy Fund (First Prospectus Summary) | Strengthening Dollar 2x Strategy Fund | U.S. Dollar Index®
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel U.S. Dollar Index® (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 1.45%
5 Years rr_AverageAnnualReturnYear05 (0.84%)
Since Inception rr_AverageAnnualReturnSinceInception (1.12%)
Inception Date rr_AverageAnnualReturnInceptionDate May 25, 2005
Strengthening Dollar 2x Strategy Fund (First Prospectus Summary) | Strengthening Dollar 2x Strategy Fund | H-Class
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.54%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 172
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 533
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 918
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,998
Annual Return 2006 rr_AnnualReturn2006 (10.43%)
Annual Return 2007 rr_AnnualReturn2007 (10.82%)
Annual Return 2008 rr_AnnualReturn2008 7.21%
Annual Return 2009 rr_AnnualReturn2009 (16.30%)
Annual Return 2010 rr_AnnualReturn2010 (4.23%)
Annual Return 2011 rr_AnnualReturn2011 (4.08%)
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, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.14%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2008
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.18%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.58%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (4.08%)
5 Years rr_AverageAnnualReturnYear05 (5.97%)
Since Inception rr_AverageAnnualReturnSinceInception (4.30%)
Inception Date rr_AverageAnnualReturnInceptionDate May 25, 2005
Strengthening Dollar 2x Strategy Fund (First Prospectus Summary) | Strengthening Dollar 2x Strategy Fund | H-Class | After Taxes on Distributions
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (4.08%)
5 Years rr_AverageAnnualReturnYear05 (7.21%)
Since Inception rr_AverageAnnualReturnSinceInception (5.28%)
Inception Date rr_AverageAnnualReturnInceptionDate May 25, 2005
Strengthening Dollar 2x Strategy Fund (First Prospectus Summary) | Strengthening Dollar 2x Strategy Fund | H-Class | After Taxes on Distributions and Sales
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (2.65%)
5 Years rr_AverageAnnualReturnYear05 (5.24%)
Since Inception rr_AverageAnnualReturnSinceInception (3.79%)
Inception Date rr_AverageAnnualReturnInceptionDate May 25, 2005