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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Aug. 01, 2011
Banking Fund (Second Prospectus Summary) | Banking Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading BANKING FUND
Investment Objective, Heading rr_ObjectiveHeading INVESTMENT OBJECTIVE -
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The Banking Fund (the "Fund") seeks to provide capital appreciation by investing in
companies that are involved in the banking sector, including commercial banks (and
their holding companies) and savings and loan institutions ("Banking Companies").
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 the Prospectus and in the "A-Class Shares - Initial
Sales Charges, Reductions, and Waivers" section beginning on page 108 of the Fund's
Statement of Additional Information (the "SAI").
Shareholder Fees, Caption rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER -
Portfolio Turnover rr_PortfolioTurnoverTextBlock 
The Fund pays transaction costs, such as commissions, when
it buys and sells securities (or "turns over" its portfolio). A higher portfolio
turnover rate may indicate higher transaction costs and may result in higher
taxes when Fund shares are held in a taxable account. These costs, which are not
reflected in Total Annual Fund Operating Expenses or in the Example, affect the
Fund's performance. During the most recent fiscal year, the Fund's portfolio
turnover rate was 1,130% 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 1130.00%
Expense Breakpoint, Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in certain Rydex|SGI Funds.
Expense Breakpoint, Minimum Investment Required Amount rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example, Heading rr_ExpenseExampleHeading EXAMPLE -
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock 
This Example is intended to help you compare the cost of investing in the
Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Fund for the time periods
indicated, and then redeem all of your shares at the end of those periods. The
Example also assumes that your investment has a 5% return each year and that the
Fund's operating expenses remain the same. Although your actual costs may be
higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Investment Strategy, Heading rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES -
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock 
Under normal circumstances, the Fund invests substantially all (at least 80%) of
its net assets in equity securities of Banking Companies that are traded in the
United States and in derivatives which primarily consist of futures contracts and
options on securities, futures contracts, and stock indices. In addition, the Fund
will invest to a significant extent in the securities of Banking Companies that have
small to mid-sized capitalizations. Banking Companies are engaged in accepting
deposits and makingcommercial and consumer loans and include state chartered banks,
savings and loan institutions, and banks that are members of the Federal Reserve
System. The Fund may also purchase American Depositary Receipts ("ADRs") to gain
exposure to foreign Banking Companies and U.S. government securities. Under U.S.
Securities and Exchange Commission regulations, the Fund may not invest more than 5%
of its total assets in the equity securities of any company that derives more than
15% of its revenues from brokerage or investment management activities. 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 invests in the securities of a limited number of issuers conducting
business in the banking sector and therefore may be concentrated in an industry or
group of industries within the banking sector. The Fund is non-diversified and,
therefore, mayinvest 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.

Banking Sector Concentration Risk - To the extent that the Fund's investments
are concentrated in issuers conducting business in the banking sector, the Fund
is subject to the risk that the securities of such issuers will underperform the
market as a whole due to legislative or regulatory changes, adverse market
conditions and/or increased competition affecting that economic sector. The
prices of the securities of Banking Companies also may fluctuate widely in
response to such events.

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.

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.

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.

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.

Mid-Capitalization Securities Risk - The Fund is subject to the risk that
medium-capitalization stocks may underperform other segments of the equity
market or the equity market as a whole.

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.

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.

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 -5.82%.
Bar Chart, Closing rr_BarChartClosingTextBlock 
Highest Quarter Return                         Lowest Quarter Return
       (quarter ended 9/30/2009) 19.74%   (quarter ended 3/31/2009) -32.41%
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)
Banking Fund (Second Prospectus Summary) | Banking 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 (5.82%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.74%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (32.41%)
Banking Fund | S&P 500® Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel S&P 500® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.06%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.29%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.41%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.17%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 01, 2004
Average Annual Returns, Since Inception Secondary ck0000899148_AverageAnnualReturnSinceInceptionSecondary 2.77%
Average Annual Returns, Inception Date Secondary ck0000899148_AverageAnnualReturnInceptionDateSecondary Mar. 30, 2001
Banking 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 0.85%
Distribution (12b-1) and/or Shareholder Service Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.54%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.64%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 634
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 968
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,324
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,326
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.13%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (13.45%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (10.25%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 01, 2004
Banking 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 7.02%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (14.07%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (10.95%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 01, 2004
Banking 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 4.63%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (11.17%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (8.58%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 01, 2004
Banking 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 0.85%
Distribution (12b-1) and/or Shareholder Service Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.53%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.38%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 341
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 742
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,270
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,716
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 241
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 742
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,270
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,716
Annual Return 2002 rr_AnnualReturn2002 (3.14%)
Annual Return 2003 rr_AnnualReturn2003 30.13%
Annual Return 2004 rr_AnnualReturn2004 12.58%
Annual Return 2005 rr_AnnualReturn2005 (4.37%)
Annual Return 2006 rr_AnnualReturn2006 9.65%
Annual Return 2007 rr_AnnualReturn2007 (28.15%)
Annual Return 2008 rr_AnnualReturn2008 (41.44%)
Annual Return 2009 rr_AnnualReturn2009 (4.03%)
Annual Return 2010 rr_AnnualReturn2010 11.71%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 10.71%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (13.13%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (4.11%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 2001
Banking 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 10.59%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (13.78%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (4.89%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 2001
Banking 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 6.95%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (10.94%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (3.73%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 2001