XML 28 R97.htm IDEA: XBRL DOCUMENT v2.4.0.6
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading 2025 Retirement Fund May 1, 2013
Objective [Heading] rr_ObjectiveHeading Investment Objective.
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks to achieve current income and capital appreciation appropriate for the asset allocation associated with its approximate year of retirement which is included in the Fund's name ("Target Retirement Date").

Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund.
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses you may pay if you buy and hold Fund shares. The expenses shown do not include Separate Account expenses which would increase costs if included.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment) N/A
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 result in higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the Fund's most recently completed fiscal year, the Fund's portfolio turnover rate was 8.59% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 8.59%
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: (a) 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, (b) a 5% return each year and (c) operating expenses remain the same. The expenses shown do not include Separate Account expenses which would increase costs if included.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, your cost based on these assumptions would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies.
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund invests in shares of other series of the Investment Company ("IC Funds") in proportions that are balanced to meet the objective of the Fund, which will move toward preservation of capital and production of income as the Target Retirement Date approaches.

Risk [Heading] rr_RiskHeading Principal Investment Risks.
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

An investment in the Fund is subject to the following risks which are described in more detail in the Prospectus.


•  General risk: The Fund may not achieve its investment objective. An investment in the Fund could decline in value, and you could lose money by investing in the Fund.


•  Underlying Fund risk: A Fund's ability to achieve its investment objective will depend largely on the performance of the selected underlying funds. There can be no assurance that either the Fund or the underlying funds will achieve its investment objective. A Fund is subject to the same risks as the underlying funds in which it invests. Although the proportion changes over time to meet the Fund's investment objective, currently the Fund has more stock risk than fixed income risk. These risks include Company, Market, Small-Cap, Mid-Cap, Value Stock, Growth Stock and Stock risks, which are all described in detail in the "Principal Risks" section of the prospectus.


•  Company risk: The price of the stock of a particular company can vary based on a variety of factors, such as the company's financial performance, changes in management and product trends, and the potential for takeover and acquisition. The prices of equity securities of smaller companies may fluctuate more than for more established companies. The equity securities of smaller companies may not be traded as often as for larger companies, therefore it may be difficult to trade securities at a desirable price. Investments in companies with small market capitalizations generally offer greater opportunities for appreciation, but are associated with more risks than for established companies.


•  Market risk: The risk that prices of securities will go down because of the interplay of market forces may affect a single issuer, industry or sector of the economy or may affect the market as a whole.


•  Small-Cap risk: Small-cap stocks generally are subject to greater, less predictable price changes than the securities of companies with larger market capitalizations.


•  Mid-Cap risk: Mid-cap stocks experience more market risk and sharper price fluctuations than for large-cap stocks due to the fact that the earnings of mid-size companies tend to be less predictable and the stocks are traded less frequently. At times it may be difficult for a Fund to sell mid-cap stocks at a price equal to their value.


•  Value Stock risk: Value stocks are generally undervalued in the marketplace, with high dividends and low prices relative to standard measures. Value stocks may remain undervalued.


•  Growth Stock risk: Growth stocks generally have above average growth potential, low dividends and high prices relative to standard measures. Growth stocks may not outperform value style investing.


•  Stock risk: The value of your investment will go up or down, depending on movements in the stock markets. The investment results may be better or worse than the results for the stock markets taken as a whole, or than the results of other funds that invest in the same types of securities. It may be more difficult for the Fund to sell a small capitalization stock or any stock that trades "over-the-counter", than a larger capitalization stock or stocks that trade on a national or regional stock exchange.


•  Fixed Income risk: The value of your investment will go up or down depending on movements in the bond markets. The Fund's investment results may differ from the results of a comparable bond market and from the results of other funds that invest in the same types of securities or particular debt securities. Mortgage-backed securities or certificates are subject to prepayment or extension risk when interest rates fall or rise, respectively. The prices of debt securities may be subject to significant volatility. Fixed income securities have an inverse relationship to interest rates, such that as interest rates rise, bond values decrease. During economic uncertainty, the value of corporate debt securities may decline relative to the value of U.S. government debt securities. Debt obligations are subject to the risk that issuers may not be able to pay off the principal and interest when due.


•  Retirement Fund risk:


•  The fund is subject to the same risks as the underlying Investment Corporation Funds ("IC Funds") in which it invests.


•  The Retirement Fund is a "fund of funds" where the allocations shift and there is no guarantee that the allocations in the Retirement Fund of the IC Funds will prove to be correct under all market and economic conditions. An investment in the Retirement Fund could decline in value, and you could lose money by investing in the Retirement Fund.


•  The Retirement Fund has assets allocated across equity and fixed income IC Funds, and is subject to the risks of investing in both equity and fixed income securities. The Retirement Fund has assets allocated to the International Fund and is subject to the risks of investing in international securities.


•  The Retirement Fund can allocate 41% of its assets, which can vary by plus or minus 10%, to equity IC Funds at the time the Target Retirement Date is reached and thereafter.


•  The appropriate Retirement Fund should suit your anticipated date of retirement, as well as your tolerance for risk and your personal financial goals. An investor with high risk tolerance may prefer a later Target Retirement Date with greater emphasis on capital appreciation; while an investor with lower risk tolerance may prefer an earlier Target Retirement Date with greater emphasis on capital preservation and current income.

Risk Lose Money [Text] rr_RiskLoseMoney An investment in the Fund could decline in value, and you could lose money by investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance/Annual Return.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below show the annual return and average annual returns of the Fund.


Below the bar chart are the Fund's highest and lowest total returns for any calendar quarter during the period covered by the chart, showing the volatility of the Fund's total returns. The numbers in parentheses are negative, representing a loss of principal.


The information indicates some of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for one year and the life of the Fund compare to those of a broad-based, unmanaged index for those periods. A fund's past performance does not necessarily indicate how it will perform in the future.


The total returns and average annual total returns shown do not include charges against the assets of the Separate Accounts that purchase Fund shares. If these charges were reflected, returns would be less than those shown. Updated performance information is available at no cost online at http://www.mutualofamerica.com or by calling 1-800-468-3785.


The information in the average annual total returns table shows how the Fund's performance compares with the returns of two indices with similar investment objectives:


(1)  The S&P 500® and S&P 500® Index refer to the Standard & Poor's 500 Composite Stock Price Index, a market value-weighted index of the common stock prices of companies included in the S&P 500®.


(2)  The Barclays Capital U.S. Aggregate Index represents U.S, fixed rate, investment grade securities, with index components for U.S. government, corporate, mortgage-backed and asset-backed securities. Each bond included in the index must have at least one year to final maturity regardless of call features and a rating of "Baa" or higher (investment grade) by a nationally recognized statistical rating agency.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below show the annual return and average annual returns of the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-468-3785
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://www.mutualofamerica.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture A fund's past performance does not necessarily indicate how it will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best and Worst Performing Quarters


   

Quarter/Year

 

Total Return

 

Best

 

Second quarter 2009

   

14.49

%

 

Worst

 

Fourth quarter 2008

   

(16.94

)%

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.49%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.94%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (Indices reflect no deduction of any charges against the assets)
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for periods ended December 31, 2012)
S&P 500® Index (Indices reflect no deduction of any charges against the assets)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.00%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.66%
Average Annual Returns, For Life of Fund rr_AverageAnnualReturnSinceInception 1.23%
Barclay's Capital Aggregate Bond Index (Indices reflect no deduction of any charges against the assets)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.21%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.95%
Average Annual Returns, For Life of Fund rr_AverageAnnualReturnSinceInception 6.05%
2025 Retirement Fund Class
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.05%
Other Expenses rr_OtherExpensesOverAssets none
Acquired Fund Fees & Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.38%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.43%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 44
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 139
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 243
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 554
Annual Return 2008 rr_AnnualReturn2008 (28.32%)
Annual Return 2009 rr_AnnualReturn2009 25.10%
Annual Return 2010 rr_AnnualReturn2010 15.49%
Annual Return 2011 rr_AnnualReturn2011 0.83%
Annual Return 2012 rr_AnnualReturn2012 12.90%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.90%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.35%
Average Annual Returns, For Life of Fund rr_AverageAnnualReturnSinceInception 2.85%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 05, 2007