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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FRANKLIN FUND ALLOCATOR SERIES
Prospectus Date rr_ProspectusDate May 01, 2016
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund  
Risk/Return: rr_RiskReturnAbstract  
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at least $50,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under “Your Account” on page 44 in the Fund's Prospectus and under “Buying and Selling Shares” on page 73 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

A mutual fund generally 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 mutual fund shares are held in a taxable account. During the most recent fiscal year, the Fund's portfolio turnover rate was 0.53% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 0.53%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at least $50,000 in Franklin Templeton funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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 the period. 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:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If you do not sell your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund is a "fund to funds" meaning that it seeks to achieve its investment goal by investing its assets in a combination of the Franklin Flex Cap Growth Fund (25%), Franklin Growth Fund (25%), Mutual Shares Fund (25%) and Templeton Growth Fund (25%) (underlying funds). The Fund makes allocations to each of the underlying funds on a fixed percentage basis. The administrator rebalances the Fund's investments in the underlying funds periodically. The Fund's Board may approve additional or different underlying funds for investment (without the approval of shareholders). These underlying funds, in turn, invest primarily in U.S. and foreign equity securities.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money by investing in the Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. government.

Investing in Underlying Funds

Because the Fund invests in underlying funds, and the Fund’s performance is directly related to the performance of the underlying funds held by it, the ability of the Fund to achieve its investment goal is directly related to the ability of the underlying funds to meet their investment goals. In addition, shareholders of the Fund will indirectly bear the fees and expenses of the underlying funds. The risks described below are the principal risks of the Fund and the underlying funds.

For purposes of the discussion below, “Fund” means one or more of the underlying funds in which the Fund invests.

Market

The market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. The market value of a security or other investment may be reduced by market activity or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more buyers than sellers, prices tend to rise.

Stock prices tend to go up and down more dramatically than those of debt securities. A slower-growth or recessionary economic environment could have an adverse effect on the prices of the various stocks held by the Fund.

Growth Style Investing

Growth stock prices reflect projections of future earnings or revenues, and can, therefore, fall dramatically if the company fails to meet those projections. Prices of these companies’ securities may be more volatile than other securities, particularly over the short term.

Value Style Investing

A value stock may not increase in price as anticipated by the investment manager if other investors fail to recognize the company's value and bid up the price, the markets favor faster-growing companies, or the factors that the investment manager believes will increase the price of the security do not occur.

Foreign Securities

Investing in foreign securities typically involves more risks than investing in U.S. securities, and includes risks associated with: internal and external political and economic developments – e.g., the political, economic and social policies and structures of some foreign countries may be less stable and more volatile than those in the U.S. or some foreign countries may be subject to trading restrictions or economic sanctions; trading practices – e.g., government supervision and regulation of foreign securities and currency markets, trading systems and brokers may be less than in the U.S.; availability of information – e.g., foreign issuers may not be subject to the same disclosure, accounting and financial reporting standards and practices as U.S. issuers; limited markets – e.g., the securities of certain foreign issuers may be less liquid (harder to sell) and more volatile; and currency exchange rate fluctuations and policies. The risks of foreign investments may be greater in developing or emerging market countries.

Focus

To the extent that the Fund focuses on particular countries, regions, industries, sectors or types of investment from time to time, the Fund may be subject to greater risks of adverse developments in such areas of focus than a fund that invests in a wider variety of countries, regions, industries, sectors or investments.

Smaller and Midsize Companies

Securities issued by smaller and midsize companies may be more volatile in price than those of larger companies, involve substantial risks and should be considered speculative. Such risks may include greater sensitivity to economic conditions, less certain growth prospects, lack of depth of management and funds for growth and development, and limited or less developed product lines and markets. In addition, smaller and midsize companies may be particularly affected by interest rate increases, as they may find it more difficult to borrow money to continue or expand operations, or may have difficulty in repaying any loans.

Derivative Instruments

The performance of derivative instruments depends largely on the performance of an underlying instrument, such as a currency, security, interest rate or index, and such instruments often have risks similar to the underlying instrument, in addition to other risks. Derivatives involve costs and can create economic leverage in the Fund’s portfolio which may result in significant volatility and cause the Fund to participate in losses (as well as gains) in an amount that exceeds the Fund’s initial investment. Other risks include illiquidity, mispricing or improper valuation of the derivative instrument, and imperfect correlation between the value of the derivative and the underlying instrument so that the Fund may not realize the intended benefits. When a derivative is used for hedging, the change in value of the derivative may also not correlate specifically with the currency, security, interest rate, index or other risk being hedged. Derivatives also may present the risk that the other party to the transaction will fail to perform.

Management

The underlying funds are subject to management risk because they are each an actively managed investment portfolio. Each underlying funds' investment manager will apply investment techniques and risk analyses in making investment decisions for the underlying fund, but there can be no guarantee that these decisions will produce the desired results.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You can obtain updated performance information at franklintempleton.com or by calling (800) DIAL BEN/342-5236.

The secondary indices in the table below show how the Fund's performance compares to a group of securities in an index of equity securities of issuers located in developed markets countries, including the United States.

Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) DIAL BEN/342-5236
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress franklintempleton.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's 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 Class A Annual Total Returns
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:Q3'0917.75%
Worst Quarter:Q4'08-21.86%
As of March 31, 2016, the Fund's year-to-date return was -1.79%.
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns
(figures reflect sales charges)

For the periods ended December 31, 2015
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

No one index is representative of the Fund's portfolio.

The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns for other classes will vary.
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets none
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25% [2]
Other expenses rr_OtherExpensesOverAssets 0.19%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.02% [3]
1 year rr_ExpenseExampleYear01 $ 673
3 years rr_ExpenseExampleYear03 881
5 years rr_ExpenseExampleYear05 1,106
10 years rr_ExpenseExampleYear10 $ 1,751
2006 rr_AnnualReturn2006 15.25%
2007 rr_AnnualReturn2007 5.20%
2008 rr_AnnualReturn2008 (38.13%)
2009 rr_AnnualReturn2009 32.74%
2010 rr_AnnualReturn2010 13.13%
2011 rr_AnnualReturn2011 (2.90%)
2012 rr_AnnualReturn2012 14.80%
2013 rr_AnnualReturn2013 31.01%
2014 rr_AnnualReturn2014 6.48%
2015 rr_AnnualReturn2015 (1.20%)
Year to Date Return, Label rr_YearToDateReturnLabel As of March 31, 2016, the Fund's year-to-date return was -1.79%.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.75%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.86%)
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management fees rr_ManagementFeesOverAssets none
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.19%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.77% [3]
1 year rr_ExpenseExampleYear01 $ 280
3 years rr_ExpenseExampleYear03 557
5 years rr_ExpenseExampleYear05 959
10 years rr_ExpenseExampleYear10 2,084
1 Year rr_ExpenseExampleNoRedemptionYear01 180
3 Years rr_ExpenseExampleNoRedemptionYear03 557
5 Years rr_ExpenseExampleNoRedemptionYear05 959
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,084
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets none
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.19%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.27% [3]
1 year rr_ExpenseExampleYear01 $ 129
3 years rr_ExpenseExampleYear03 403
5 years rr_ExpenseExampleYear05 697
10 years rr_ExpenseExampleYear10 $ 1,534
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets none
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.19%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.77% [3]
1 year rr_ExpenseExampleYear01 $ 79
3 years rr_ExpenseExampleYear03 246
5 years rr_ExpenseExampleYear05 428
10 years rr_ExpenseExampleYear10 $ 954
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | Return Before Taxes | Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Franklin Corefolio Allocation Fund
Label rr_AverageAnnualReturnLabel Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (6.89%)
Past 5 years rr_AverageAnnualReturnYear05 7.68%
Past 10 years rr_AverageAnnualReturnYear10 5.01%
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | Return Before Taxes | Class C  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 (2.85%)
Past 5 years rr_AverageAnnualReturnYear05 8.18%
Past 10 years rr_AverageAnnualReturnYear10 4.89%
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | Return Before Taxes | Class R  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 (1.43%)
Past 5 years rr_AverageAnnualReturnYear05 8.72%
Past 10 years rr_AverageAnnualReturnYear10 5.42%
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | Return Before Taxes | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 (0.96%)
Past 5 years rr_AverageAnnualReturnYear05 9.25%
Past 10 years rr_AverageAnnualReturnYear10 5.94%
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Franklin Corefolio Allocation Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 (8.10%)
Past 5 years rr_AverageAnnualReturnYear05 7.11%
Past 10 years rr_AverageAnnualReturnYear10 4.51%
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | After Taxes on Distributions and Sales | Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Franklin Corefolio Allocation Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 (2.78%)
Past 5 years rr_AverageAnnualReturnYear05 6.10%
Past 10 years rr_AverageAnnualReturnYear10 4.05%
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | S&P 500® Index (index reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 1.38%
Past 5 years rr_AverageAnnualReturnYear05 12.57%
Past 10 years rr_AverageAnnualReturnYear10 7.31%
Franklin Fund Allocator Series FAS2-10 | Franklin Corefolio Allocation Fund | MSCI World Index (index reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 (0.32%)
Past 5 years rr_AverageAnnualReturnYear05 8.20%
Past 10 years rr_AverageAnnualReturnYear10 5.56%
[1] There is a 1% contingent deferred sales charge that applies to investments of $1 million or more (see "Investments of $1 Million or More" under "Choosing a Share Class") and purchases by certain retirement plans without an initial sales charge.
[2] Class A distribution and service (12b-1) fees have been restated to reflect the maximum annual rate set by the board of trustees. Consequently, the total annual Fund operating expenses differ from the ratio of expenses to average net assets shown in the Financial Highlights due to a different 12b-1 fee rate paid in the Fund’s most recent fiscal year.
[3] Total annual Fund operating expenses differ from the ratio of expenses to average net assets shown in the Financial Highlights, which reflect operating expenses of the Fund and do not include acquired fund fees and expenses.