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Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Aug. 01, 2011
Russell 2000 Fund (Second Prospectus Summary) | Russell 2000 Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading RUSSELL 2000® FUND
Investment Objective, Heading rr_ObjectiveHeading INVESTMENT OBJECTIVE -
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The Russell 2000® Fund (the "Fund") seeks to provide investment results that match,
before fees and expenses, the performance of a specific benchmark on a daily basis.
The Fund's current benchmark is the Russell 2000® Index (the "underlying index").
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 306 of theProspectus 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 284% 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 284.00%
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
Expenses, Not Correlated to Ratio Due to Acquired Fund Fees rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses in this fee table 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 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 investing in the
common stock of companies that are generally within the capitalization range
of the underlying index and derivative instruments, which primarily consist
of equity index swaps, futures contracts, and options on securities, futures
contracts, and stock indices. Equity index swaps and futures and options
contracts enable the Fund to pursue its 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. Under normal
circumstances, the Fund will invest at least 80% of its net assets, plus any
borrowings for investment purposes, in securities of companies in the underlying
index and derivatives and other instruments whose performance is expected to
correspond to that of the underlying index. The Russell 2000® Index is composed
of the 2,000 smallest companies in the Russell 3000® Index, representing
approximately 10% of the Russell 3000® total market capitalization and consisting
of capitalizations ranging from $21.38 million to $3.12 billion as of June 30,
2011. The Russell 3000® Index is composed of the 3,000 largestU.S. companies
ranked by total market capitalization, representing approximately 98% of the U.S.
investable equity market. 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 short-term U.S. government securities or cash equivalents to
collateralize its 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 Fund's 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.

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.

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.

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.

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,
and high portfolio turnover rate 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 
The following bar chart shows the performance of the C-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 A-Class Shares and C-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 but do not reflect sales charges. If they did, returns
would be lower. 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 C-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 5.13%.
Bar Chart, Closing rr_BarChartClosingTextBlock 
Highest Quarter Return                          Lowest Quarter Return
(quarter ended 6/30/2009) 20.43%   (quarter ended 12/31/2008) -27.03%
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)
Russell 2000 Fund (Second Prospectus Summary) | Russell 2000 Fund | C-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 5.13%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.43%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (27.03%)
Russell 2000 Fund | Russell 2000® Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Russell 2000® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 26.85%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.24%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
Russell 2000 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 (12b-1) and/or Shareholder Service Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.56%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.58% [1]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 628
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 950
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,295
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,264
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 19.31%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.49%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
Russell 2000 Fund | A-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 19.31%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.40%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
Russell 2000 Fund | A-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 12.55%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.36%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
Russell 2000 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 (12b-1) and/or Shareholder Service Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.56%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.33% [1]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 336
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 727
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,245
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,666
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 236
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 727
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,245
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,666
Annual Return 2007 rr_AnnualReturn2007 (3.66%)
Annual Return 2008 rr_AnnualReturn2008 (35.69%)
Annual Return 2009 rr_AnnualReturn2009 23.75%
Annual Return 2010 rr_AnnualReturn2010 24.20%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 23.20%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.77%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
Russell 2000 Fund | C-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 23.20%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.67%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
Russell 2000 Fund | C-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 15.08%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.60%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
[1] The Total Annual Fund Operating Expenses in this fee table 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.