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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Aug. 01, 2011
S&P MidCap 400 Pure Value Fund (First Prospectus Summary) | S&P MidCap 400 Pure Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading S&P MIDCAP 400 PURE VALUE FUND
Investment Objective, Heading rr_ObjectiveHeading INVESTMENT OBJECTIVE -
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The S&P MidCap 400 Pure Value Fund (the "Fund") seeks to provide investment results that match,
before fees and expenses, the performance of a benchmark for mid-cap value securities on a daily
basis. The Fund's current benchmark is the S&P MidCap 400 Pure Value 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
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 407% 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 407.00%
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 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 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. 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 S&P MidCap 400 Pure
Value Index is narrow in focus, containing only those S&P MidCap 400 companies
with strong value characteristics. As of June 30, 2011, the S&P MidCap 400 Pure
Value Index included companies with capitalizations ranging from $750.56 million
to $5.71 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
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.

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.

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.

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.

Value Stocks Risk - Value stocks are subject to the risk that the intrinsic
value of the stock may never be realized by the market or that the price goes
down.
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 2.78%.
Bar Chart, Closing rr_BarChartClosingTextBlock 
Highest Quarter Return                      Lowest Quarter Return
(quarter ended 6/30/2009) 37.89%   (quarter ended 12/31/2008) -34.65%
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)
S&P MidCap 400 Pure Value Fund (First Prospectus Summary) | S&P MidCap 400 Pure Value 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 2.78%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 37.89%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (34.65%)
S&P MidCap 400 Pure Value Fund | S&P MidCap 400 Pure Value Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel S&P MidCap 400 Pure Value Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 23.18%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.40%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.64%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 20, 2004
Average Annual Returns, Since Inception Secondary ck0000899148_AverageAnnualReturnSinceInceptionSecondary 8.11%
Average Annual Returns, Inception Date Secondary ck0000899148_AverageAnnualReturnInceptionDateSecondary Sep. 01, 2004
S&P MidCap 400 Pure Value 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 0.55%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.55%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 157
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 489
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 843
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,842
Annual Return 2005 rr_AnnualReturn2005 8.62%
Annual Return 2006 rr_AnnualReturn2006 16.55%
Annual Return 2007 rr_AnnualReturn2007 (5.28%)
Annual Return 2008 rr_AnnualReturn2008 (43.96%)
Annual Return 2009 rr_AnnualReturn2009 50.25%
Annual Return 2010 rr_AnnualReturn2010 19.53%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 19.53%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.13%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.46%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 20, 2004
S&P MidCap 400 Pure Value 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 15.97%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.28%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.77%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 20, 2004
S&P MidCap 400 Pure Value 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 12.64%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.34%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.45%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 20, 2004