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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading U.S. Government Securities
Objective [Heading] rr_ObjectiveHeading INVESTMENT GOAL
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment goal of the SunAmerica U.S. Government Securities Fund (the “U.S. Government Securities Fund” or the “Fund”) is high current income consistent with relative safety of capital.

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 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 the SunAmerica fund complex. More information about these and other discounts is available from your financial professional and in the “Shareholder Account Information-Sales Charge Reductions and Waivers” section on page 21 of the Fund’s Prospectus and in the “Additional Information Regarding Purchase of Shares” section on page 85 of the Fund’s statement of additional information.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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 shares are held in a taxable account. These costs, which are not reflected in 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 89% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 89.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of Class A shares of $1 million or more will be subject to a contingent deferred sales charge (CDSC) on redemptions made within two years of purchase. The CDSC on Class B shares applies only if shares are redeemed within six years of their purchase. The CDSC on Class C shares applies only if shares are redeemed within twelve months of their purchase. See pages 20-22 of the Prospectus for more information about the CDSCs.
Expense Breakpoint Discounts [Text] 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 the SunAmerica fund complex.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
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. Although your actual costs may be higher or lower, based on these assumptions and the net expenses shown in the fee table, your costs would be:

Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGY AND TECHNIQUES OF THE FUND
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund’s principal investment strategy is fixed income investing. The strategy of “fixed income investing” in which the Fund engages includes utilizing economic research and analysis of current economic conditions, potential fluctuations in interest rates, and, where relevant, the strength of the underlying issuer.


The principal investment technique of the Fund is active trading of U.S. government securities without regard to the maturities of such securities. Under normal market conditions, at least 80% of the Fund’s net assets, plus any borrowing for investment purposes, will be invested in such securities.


U.S. government securities, including bills, notes, bonds and other debt securities, are issued by the U.S. Treasury or agencies and instrumentalities of the U.S. government. Certain government securities are direct obligations of the U.S. Treasury (such as Treasury Bills) and, as such, are backed by the “full faith and credit” of the U.S. government. Other types of government securities are issued by agencies or instrumentalities of the U.S. government. These types of securities may or may not be backed by the “full faith and credit” of the U.S. government. When a U.S. government security is an obligation of an agency or instrumentality and not backed by the U.S. government, the holder of such security must look principally to the agency or instrumentality issuing or guaranteeing the security for all obligations due, including repayment of principal, and not the U.S. government.


The principal investment strategy and principal investment technique of the Fund may be changed without shareholder approval. You will receive at least sixty (60) days’ notice of any change to the 80% investment policy set forth above.

Risk [Heading] rr_RiskHeading PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

There can be no assurance that the Fund’s investment goal will be met or that the net return on an investment in the Fund will exceed what could have been obtained through other investment or savings vehicles. Shares of the Fund are not bank deposits and are not guaranteed or insured by any bank, government entity or the Federal Deposit Insurance Corporation. As with any mutual fund, there is no guarantee that the Fund will be able to achieve its investment goals. If the value of the assets of the Fund goes down, you could lose money.


The following is a summary description of the principal risks of investing in the Fund.


Interest Rate Fluctuations. Interest rates and bond prices typically move inversely to each other. Thus, as interest rates rise, bond prices typically fall and as interest rates fall, bond prices typically rise. Longer-term and lower coupon bonds tend to be more sensitive to changes in interest rates. In addition, the market tends to discount prices of securities issued by the Government National Mortgage Association (GNMA) for prepayment risk when interest rates decline. As a result, the prices of GNMA securities typically do not rise as much as the prices of comparable bonds during periods of falling interest rates.


Bond Market Volatility. The bond markets as a whole could go up or down (sometimes dramatically). This could affect the value of the securities in the Fund’s portfolio.


U.S. Government Securities Risk. Securities issued or guaranteed by federal agencies or authorities and U.S. government-sponsored instrumentalities or enterprises may or may not be backed by the full faith and credit of the U.S. government. For example, securities issued by the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association and the Federal Home Loan Bank are neither insured nor guaranteed by the U.S. government. These securities may be supported only by the credit of the issuing agency, authority, instrumentality or enterprise or by the ability to borrow from the U.S. Treasury and, as a result, are subject to greater credit risk than securities issued or guaranteed by the U.S. Treasury.


Prepayment Risk. The Fund may invest significantly in mortgage-backed securities, which entails the risk that the underlying principal may be “prepaid” at any time. As a general rule, prepayments increase during a period of falling interest rates and decrease during a period of rising interest rates. As a result of prepayments, the Fund may lose potential price appreciation and may be required to reinvest its assets in securities with lower interest rates. In periods of increasing interest rates, prepayments generally may decline, with the effect that the securities subject to prepayment risk held by the Fund may exhibit price characteristics of longer-term debt securities. Generally, long-term bonds are more interest-rate sensitive.


Active Trading.As part of the Fund’s principal investment technique, the Fund may engage in active trading of its portfolio securities. Because the Fund may sell a security without regard to how long it has held the security, active trading may have tax consequences for certain shareholders, involving a possible increase in short-term capital gains or losses. Active trading may result in high portfolio turnover and correspondingly greater brokerage commissions and other transaction costs, which will be borne directly by the Fund and which will affect the Fund’s performance. During periods of increased market volatility, active trading may be more pronounced.


Securities Selection. A strategy used by the Fund, or securities selected by a portfolio manager, may fail to produce the intended return.

Risk Lose Money [Text] rr_RiskLoseMoney As with any mutual fund, there is no guarantee that the Fund will be able to achieve its investment goals. If the value of the assets of the Fund goes down, you could lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Shares of the Fund are not bank deposits and are not guaranteed or insured by any bank, government entity or the Federal Deposit Insurance Corporation.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following Risk/Return Bar Chart and Table illustrates the risks of investing in the Fund by showing changes in the Fund’s performance from calendar year to calendar year, and compares the Fund’s average annual returns to those of the BofA Merrill Lynch U.S. Treasury Master Index, a broad measure of market performance. Sales charges are not reflected in the Bar Chart. If these amounts were reflected, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Of course, past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated information on the Fund’s performance can be obtained by visiting www.safunds.com or can be obtained by phone at 800-858-8850 ext. 6003.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following Risk/Return Bar Chart and Table illustrates the risks of investing in the Fund by showing changes in the Fund's performance from calendar year to calendar year, and compares the Fund's average annual returns to those of the BofA Merrill Lynch U.S. Treasury Master Index, a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-858-8850
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.safunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Of course, past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading U.S. GOVERNMENT SECURITIES FUND (Class A)
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales charges are not reflected in the Bar Chart. If these amounts were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the 10-year period shown in the Bar Chart, the highest return for a quarter was 7.86% (quarter ended December 31, 2008) and the lowest return for a quarter was -3.04% (quarter ended June 30, 2004).

The Fund's cumulative year-to-date return through the most recent calendar quarter ended June 30, 2013, was -3.88%.

Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (3.88%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2008
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.86%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2004
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.04%)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads However, the table includes all applicable fees and sales charges.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown were calculated using the historical highest 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 An investor's actual after-tax returns depend on the investor's tax situation and may differ from those shown in the above table. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class A shares. After-tax returns for other classes will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher When the return after taxes on distributions and sale of Fund shares is higher, it is because of realized losses. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns shown were calculated using the historical highest individual federal marginal income tax rates, and do not reflect the impact of state and local taxes. An investor’s actual after-tax returns depend on the investor’s tax situation and may differ from those shown in the above table. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.


After-tax returns are shown only for Class A shares. After-tax returns for other classes will vary.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of the periods ended December 31, 2012)
BofA Merrill Lynch U.S. Treasury Master Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 2.16%
Average Annual Returns, Past Five Years rr_AverageAnnualReturnYear05 5.44%
Average Annual Returns, Past Ten Years rr_AverageAnnualReturnYear10 4.78%
Class A
  
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 the lesser of the amount redeemed or original purchase cost) rr_MaximumDeferredSalesChargeOverOther none [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses rr_OtherExpensesOverAssets 0.39%
Total Annual Fund Operating Expenses Before Fee Waivers and/or Expense Reimbursements rr_ExpensesOverAssets 1.39%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.40%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.99% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 571
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 775
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 996
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,630
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 571
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 775
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 996
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,630
Annual Return 2003 rr_AnnualReturn2003 1.36%
Annual Return 2004 rr_AnnualReturn2004 3.51%
Annual Return 2005 rr_AnnualReturn2005 2.69%
Annual Return 2006 rr_AnnualReturn2006 2.91%
Annual Return 2007 rr_AnnualReturn2007 6.75%
Annual Return 2008 rr_AnnualReturn2008 11.52%
Annual Return 2009 rr_AnnualReturn2009 (2.87%)
Annual Return 2010 rr_AnnualReturn2010 4.23%
Annual Return 2011 rr_AnnualReturn2011 9.45%
Annual Return 2012 rr_AnnualReturn2012 1.25%
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 (3.55%)
Average Annual Returns, Past Five Years rr_AverageAnnualReturnYear05 3.57%
Average Annual Returns, Past Ten Years rr_AverageAnnualReturnYear10 3.50%
Class A | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 (4.66%)
Average Annual Returns, Past Five Years rr_AverageAnnualReturnYear05 2.44%
Average Annual Returns, Past Ten Years rr_AverageAnnualReturnYear10 2.26%
Class A | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 (2.31%) [4]
Average Annual Returns, Past Five Years rr_AverageAnnualReturnYear05 2.41% [4]
Average Annual Returns, Past Ten Years rr_AverageAnnualReturnYear10 2.25% [4]
Class B
  
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 the lesser of the amount redeemed or original purchase cost) rr_MaximumDeferredSalesChargeOverOther 4.00% [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.58%
Total Annual Fund Operating Expenses Before Fee Waivers and/or Expense Reimbursements rr_ExpensesOverAssets 2.23%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.59%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.64% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 567 [5]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 817 [5]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,092 [5]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,770 [5]
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 167 [5]
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 517 [5]
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 892 [5]
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,770 [5]
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 (3.32%)
Average Annual Returns, Past Five Years rr_AverageAnnualReturnYear05 3.54%
Average Annual Returns, Past Ten Years rr_AverageAnnualReturnYear10 3.47%
Class C
  
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 the lesser of the amount redeemed or original purchase cost) rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.44%
Total Annual Fund Operating Expenses Before Fee Waivers and/or Expense Reimbursements rr_ExpensesOverAssets 2.09%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.45%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.64% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 267
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 517
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 892
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,944
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 167
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 517
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 892
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,944
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 (0.39%)
Average Annual Returns, Past Five Years rr_AverageAnnualReturnYear05 3.91%
Average Annual Returns, Past Ten Years rr_AverageAnnualReturnYear10 3.33%
[1] Purchases of Class A shares of $1 million or more will be subject to a contingent deferred sales charge (CDSC) on redemptions made within two years of purchase. The CDSC on Class B shares applies only if shares are redeemed within six years of their purchase. The CDSC on Class C shares applies only if shares are redeemed within twelve months of their purchase. See pages 20-22 of the Prospectus for more information about the CDSCs.
[2] Pursuant to an Expense Limitation Agreement, SunAmerica Asset Management Corp. ("SunAmerica" or the "Adviser") is contractually obligated to waive its fees and/or reimburse expenses to the extent that the Total Annual Fund Operating Expenses exceed 0.99%, 1.64% and 1.64%, for Class A, B and C shares, respectively. For purposes of the Expense Limitation Agreement, "Total Annual Fund Operating Expenses" shall not include extraordinary expenses, as determined under generally accepted accounting principles, or acquired fund fees and expenses. This agreement will continue in effect indefinitely, unless terminated by the Board of Trustees, including a majority of the Independent Trustees.
[3] Any waivers and/or reimbursements made by SunAmerica are subject to recoupment from the Fund within two years after the occurrence of the waiver and/or reimbursement, provided that the Fund is able to effect such payment to SunAmerica and remain in compliance with the expense cap in effect at the time the waivers and/or reimbursements occurred.
[4] When the return after taxes on distributions and sale of Fund shares is higher, it is because of realized losses. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
[5] Class B shares generally convert to Class A shares approximately eight years after purchase. Therefore, the expense ratios used in the calculations for years 9 and 10 are the same for both Class A and Class B shares.