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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Jul. 29, 2011
Tax Exempt Insured (Prospectus Summary) | Tax Exempt Insured
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Tax Exempt Insured Fund
Investment Objective, Heading rr_ObjectiveHeading Investment Goal
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The investment goal of the SunAmerica Tax Exempt Insured Fund (the "Tax Exempt
Insured Fund" or the "Fund") is as high a level of current income exempt from
federal income taxes as is consistent with preservation of capital.
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
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 27 of the
Fund's Prospectus and in the "Additional Information Regarding Purchase of
Shares" section on page 87 of the Fund's statement of additional information.
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 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 2% of the
average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 2.00%
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 the SunAmerica fund complex.
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 and the net expenses shown in the fee table, 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 Strategy and Techniques of the Fund
Investment Strategy, Narrative 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 municipal
bonds and other municipal securities. Under normal market conditions, at least
80% of the Fund's net assets plus any borrowing for investment purposes will be
invested in municipal bonds and other municipal securities, the income of which
is exempt from federal income taxes (including the federal alternative minimum
tax), and that are insured as to the scheduled payment of principal and interest
for as long as such securities are held by the Fund, without regard to the
maturities of such securities.

The principal investment strategy of the Fund may be changed without shareholder
approval. However, the principal investment technique of the Fund as set forth
above, including the 80% investment policy, may not be changed without
shareholder approval.
Risk, Heading rr_RiskHeading Principal Risks of Investing in the Fund
Risk, Narrative rr_RiskNarrativeTextBlock 
There can be no assurance that the Fund's investment goals 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.

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.

Credit Risk. The Fund will invest in bonds with various credit ratings. The
creditworthiness of the issuer is always a factor in analyzing fixed-income
securities. An issuer with a lower credit rating will be more likely than a
higher-rated issuer to default or otherwise become unable to honor its financial
obligations. In addition, with respect to the insured bonds held by the Fund,
while the insurance reduces credit risk by insuring that the Fund will receive
payment of principal and interest, it does not protect against fluctuations in
the value of the Fund's shares caused by changes in interest rates or other
factors. Moreover, rating agency downgrades of an insurer, or other events in
the credit markets that may affect the insured bond market as a whole, may
adversely  affect the value of the insured bonds held by the Fund. It is also
important to note that, although insurance may increase the credit safety of
investments held by the Fund, it decreases the Fund's yield as the Fund may pay
for the insurance directly or indirectly.

Municipal Market Risk. Special factors relating to municipal securities could
have a significant effect on the yield or value of the Fund's investments in
municipal securities. These factors include, generally, political, or
legislative changes and uncertainties related to the tax status of municipal
securities or the rights of investors in these securities. In addition, in order
to pay interest that is exempt from federal income taxes, tax-exempt securities
must meet certain legal requirements. Failure to meet such requirements may
cause the interest received and distributed by the Fund to shareholders to be
taxable, even retroactively. In addition, the number of municipal insurers is
relatively small, and, as a result, changes in the financial condition of an
individual municipal insurer may affect the overall municipal market and the
value of Fund securities insured by that insurer. To the extent that the Fund
invests a larger portion of its assets in a particular named state's municipal
securities, it will be more vulnerable to events adversely affecting that state,
including economic, political or regulatory occurrences and terrorism or
catastrophic natural disasters, such as hurricanes or earthquakes.

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 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 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 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, before and after
taxes, to those of the Barclays Capital Municipal Bond 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.sunamericafunds.com or can be obtained by phone
at 800-858-8850 ext. 6003.
Performance, Information Illustrates Variability of Returns 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, before and after taxes, to those of the Barclays Capital Municipal Bond 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.
Performance, Availability Phone Number rr_PerformanceAvailabilityPhone 800-858-8850 ext. 6003
Performance, Availability Website Address rr_PerformanceAvailabilityWebSiteAddress www.sunamericafunds.com
Performance, Past Does Not Indicate Future 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 TAX EXEMPT INSURED FUND (Class A)
Bar Chart, Closing rr_BarChartClosingTextBlock 
During the 10-year period sh own in the Bar Chart, the highest return for a
quarter was 5.66% (quarter ended September 30, 2009) and the lowest return for
a quarter was -4.77% (quarter ended December 31, 2010).

The Fund's cumulative year-to-date return through the most recent calendar
quarter ended June 30, 2011 was 3.45%.
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 rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class A. After-tax returns for other classes will vary.
Performance Table, Narrative rr_PerformanceTableNarrativeTextBlock 
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. After-tax returns for other
classes will vary.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of the periods ended December 31, 2010)
Tax Exempt Insured (Prospectus Summary) | Tax Exempt Insured | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.45%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.66%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.77%)
Tax Exempt Insured | Barclays Capital Municipal Bond Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Barclays Capital Municipal Bond Index
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.38%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.09%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.84%
Tax Exempt Insured | 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_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses rr_OtherExpensesOverAssets 0.42% [3]
Total Annual Fund Operating Expenses Before Fee Waivers and/or Expense Reimbursements rr_ExpensesOverAssets 1.27%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.35%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.92% [2]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 564
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 754
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 960
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,553
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 564
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 754
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 960
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,553
Annual Return 2001 rr_AnnualReturn2001 3.37%
Annual Return 2002 rr_AnnualReturn2002 8.39%
Annual Return 2003 rr_AnnualReturn2003 4.75%
Annual Return 2004 rr_AnnualReturn2004 3.18%
Annual Return 2005 rr_AnnualReturn2005 2.34%
Annual Return 2006 rr_AnnualReturn2006 3.95%
Annual Return 2007 rr_AnnualReturn2007 2.42%
Annual Return 2008 rr_AnnualReturn2008 (0.55%)
Annual Return 2009 rr_AnnualReturn2009 9.25%
Annual Return 2010 rr_AnnualReturn2010 0.50%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.26%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.06%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.22%
Tax Exempt Insured | Class A | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions (Class A)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.34%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.99%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.03%
Tax Exempt Insured | Class A | 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 (Class A) [4]
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.58%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.24%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.16%
Tax Exempt Insured | 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_MaximumDeferredSalesChargeOverOfferingPrice 4.00% [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.91% [3]
Total Annual Fund Operating Expenses Before Fee Waivers and/or Expense Reimbursements rr_ExpensesOverAssets 2.41%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.35%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 2.06% [2]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 609
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 946
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,308
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,096
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 209
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 646
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,108
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,096
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class B
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.43%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.72%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.08%
Tax Exempt Insured | 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_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.48% [3]
Total Annual Fund Operating Expenses Before Fee Waivers and/or Expense Reimbursements rr_ExpensesOverAssets 1.98%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.35%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.63% [2]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 266
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 514
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 887
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,933
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 166
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 514
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 887
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,933
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.10%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.41%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.04%
[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 26-28 of the Prospectus for more information about the CDSCs.
[2] Pursuant to a Fee Waiver Agreement, SunAmerica is contractually obligated to waive its advisory fee with respect to the Fund so that the advisory fee payable by the Fund to SunAmerica Asset Management Corp. under the Investment Advisory and Management Agreement equals 0.15% of average daily net assets. This Fee Waiver Agreement will continue in effect indefinitely, unless terminated by the Board of Trustees, including a majority of the Independent Trustees.
[3] "Other Expenses" include "acquired fund fees and expenses."
[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.