Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Aug. 01, 2011
U.S. Government Money Market Fund (First Prospectus Summary) | U.S. Government Money Market Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	U.S. GOVERNMENT MONEY MARKET FUND
Investment Objective, Heading	rr_ObjectiveHeading	INVESTMENT OBJECTIVE -
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	The U.S. Government Money Market Fund (the "Fund") seeks to provide security of principal, high current income, and liquidity.
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 Advisor Class Shares or Investor 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 invests primarily in money market instruments issued or guaranteed as to principal and interest by the U.S. government, its agencies or instrumentalities, and enters into repurchase agreements fully collateralized by U.S. government securities. The Fund may also invest in 2a-7 eligible securities, including, but not limited to Eurodollar Time Deposits, securities issued by the International Bank for Reconstruction and Development (the World Bank), and high-quality commercial paper certificates of deposit, and short-term corporate bonds. The Fund operates under U.S.Securities and Exchange Commission rules, which impose certain liquidity, maturity and diversification requirements on all money market funds. All securities purchased by the Fund must have remaining maturities of 397 days or less, and must be found by the Advisor to represent minimal credit risk and be of eligible quality. Under normal circumstances, the Fund will invest at least 80% of its net assets, plus any borrowings for investment purposes, in fixed income securities issued by the U.S. government (and derivatives thereof).
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: Credit Risk - The Fund could lose money if the issuer or guarantor of a debt instrument in which it invests becomes unwilling or unable to make timely principal and/or interest payments, or to otherwise meet its obligations. Income Risk - Income Risk involves the potential for decline in the Fund's yield (the rate of dividends the Fund pays) in the event of declining interest rates. Interest Rate Risk - The market value of fixed income investments and related financial instruments will change in response to interest rate changes. During periods of falling interest rates, the values of fixed income securities generally rise. Conversely, during periods of rising interest rates, the values of such securities generally decline. Stable Price Per Share Risk - The Fund's assets are valued using the amortized cost method, which enables the Fund to maintain a stable price of $1.00 per share. Although the Fund is managed to maintain a stable price per share of $1.00, there is no guarantee that the price will be constantly maintained, and it is possible to lose money.
Risk, Money Market Fund	rr_RiskMoneyMarketFund	As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money.
Bar Chart and Performance Table, Heading	rr_BarChartAndPerformanceTableHeading	PERFORMANCE INFORMATION -
Performance, Narrative	rr_PerformanceNarrativeTextBlock	The following bar chart shows the performance of the Advisor 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 Advisor Class Shares and Investor Class Shares of the Fund as an average over different periods of time.The figures in the bar chart and table assume the reinvestment of dividends and capital gains distributions. Of course, this past performance 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 does not necessarily indicate how the Fund will perform in the future.
Bar Chart, Narrative	rr_BarChartNarrativeTextBlock	The performance information shown below for Investor 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 0.00%.
Bar Chart, Closing	rr_BarChartClosingTextBlock	Highest Quarter Return Lowest Quarter Return (quarter ended 3/31/2001) 1.23% (quarter ended 3/31/2010) 0.00%
Performance Table, Closing	rr_PerformanceTableClosingTextBlock	YIELD Call 800.820.0888 for the Fund's current yield.
Average Annual Returns, Caption	rr_AverageAnnualReturnCaption	AVERAGE ANNUAL TOTAL RETURN (for periods ended December 31, 2010)
U.S. Government Money Market Fund (First Prospectus Summary) | U.S. Government Money Market Fund | Investor
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	0.00%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest Quarter Return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2001
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	1.23%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest Quarter Return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	0.00%
U.S. Government Money Market Fund | Advisor
Risk/Return:	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.50%
Distribution (12b-1) and/or Shareholder Service Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.69%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.44%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	147
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	456
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	787
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	1,724
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Return Before Taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	0.01%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.67%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	1.35%
U.S. Government Money Market Fund | Investor
Risk/Return:	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.50%
Distribution (12b-1) and/or Shareholder Service Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.44%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.94%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	96
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	300
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	520
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	1,155
Annual Return 2001	rr_AnnualReturn2001	3.33%
Annual Return 2002	rr_AnnualReturn2002	0.86%
Annual Return 2003	rr_AnnualReturn2003	0.24%
Annual Return 2004	rr_AnnualReturn2004	0.45%
Annual Return 2005	rr_AnnualReturn2005	2.33%
Annual Return 2006	rr_AnnualReturn2006	4.08%
Annual Return 2007	rr_AnnualReturn2007	4.22%
Annual Return 2008	rr_AnnualReturn2008	1.65%
Annual Return 2009	rr_AnnualReturn2009	0.05%
Annual Return 2010	rr_AnnualReturn2010	0.01%
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Return Before Taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	0.01%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.98%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	1.71%