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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName MAXIM SERIES FUND INC
Prospectus Date rr_ProspectusDate Nov. 20, 2011
Maxim SecureFoundation Balanced Portfolio | Class G
 
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.10%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets none
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58% [1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.68% [2]
1 Year rr_ExpenseExampleYear01 69
3 Years rr_ExpenseExampleYear03 218
5 Years rr_ExpenseExampleYear05 379
10 Years rr_ExpenseExampleYear10 847
Annual Return 2010 rr_AnnualReturn2010 11.02%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.45%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.03%)
One Year rr_AverageAnnualReturnYear01 11.02%
Since Inception rr_AverageAnnualReturnSinceInception 10.36%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 13, 2009
Maxim SecureFoundation Balanced Portfolio | Class G1
 
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.10%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets none
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58% [1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.78% [2]
1 Year rr_ExpenseExampleYear01 80
3 Years rr_ExpenseExampleYear03 249
5 Years rr_ExpenseExampleYear05 433
10 Years rr_ExpenseExampleYear10 966
One Year rr_AverageAnnualReturnYear01 10.92%
Since Inception rr_AverageAnnualReturnSinceInception 10.27%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 13, 2009
Maxim SecureFoundation Balanced Portfolio | Class L
 
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.10%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets none
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58% [1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.93% [2]
1 Year rr_ExpenseExampleYear01 95
3 Years rr_ExpenseExampleYear03 296
5 Years rr_ExpenseExampleYear05 515
10 Years rr_ExpenseExampleYear10 1,143
One Year rr_AverageAnnualReturnYear01 11.02% [3]
Since Inception rr_AverageAnnualReturnSinceInception 10.36% [3]
Maxim SecureFoundation Balanced Portfolio
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Objective [Heading] rr_ObjectiveHeading
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Expense [Heading] rr_ExpenseHeading
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 57.76%
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates The Acquired Fund (Underlying Portfolio) Fees and Expenses are restated based on estimated amounts for the Portfolio's 2011 fiscal year
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Portfolio Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Portfolio's Financial Highlights, which reflects the operating expenses of the Portfolio and does not include Acquired Fund (Underlying Portfolio) Fees and Expenses
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
Strategy [Heading] rr_StrategyHeading
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Risk [Heading] rr_RiskHeading
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Risk Lose Money [Text] rr_RiskLoseMoney The following are risks associated with Underlying Portfolio investments that may indirectly result in a loss of your investment in a Portfolio.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Portfolio is classified as non-diversified. As a result, the Portfolio's securities may be more susceptible to any single economic, political or regulatory event than that experienced by a similarly structured diversified portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide an indication of the risk of investment in the Portfolio by showing the performance of the Portfolio's Class G shares in each full calendar year since inception and comparing its average annual total return to the performance of broad based securities market indices and a Composite Index which has investment characteristics similar to those of the Portfolio.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.maximfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The returns shown below are historical and are not an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Performance Table Heading rr_PerformanceTableHeading
Maxim SecureFoundation Balanced Portfolio | Wilshire 5000 Index (reflects no deduction for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 17.16%
Since Inception rr_AverageAnnualReturnSinceInception 18.45%
Maxim SecureFoundation Balanced Portfolio | Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 6.54%
Since Inception rr_AverageAnnualReturnSinceInception 5.31%
Maxim SecureFoundation Balanced Portfolio | Composite Index (reflects no deduction for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 11.92%
Since Inception rr_AverageAnnualReturnSinceInception 12.24%
[1] The Acquired Fund (Underlying Portfolio) Fees and Expenses are restated based on estimated amounts for the Portfolio's 2011 fiscal year.
[2] The Total Annual Portfolio Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Portfolio's Financial Highlights, which reflects the operating expenses of the Portfolio and does not include Acquired Fund (Underlying Portfolio) Fees and Expenses.
[3] Class L shares are new and had not commenced operations as of December 31, 2010. For the periods prior to the commencement of operations of Class L shares, the performance information shown above is for the Portfolio's Class G shares and has not been adjusted to reflect the expenses of the Class L shares. Class G, Class G1, and Class L shares invest in the same portfolio of securities and will have substantially similar annual returns, except to the extent that the expenses borne by each share class differ. Class L shares have higher expenses (and therefore lower performance) resulting from its Rule 12b-1 plan, which provides for a maximum fee equal to an annual rate of 0.25% (expressed as a percentage of average daily net assets).