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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 Templeton Fund Allocator Series RTF-13 | Franklin LifeSmart™ 2055 Retirement Target Fund  
Risk/Return: rr_RiskReturnAbstract  
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The highest level of long-term total return consistent with its asset allocation.
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 187 in the Fund's Prospectus and under “Buying and Selling Shares” on page 92 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. For the period of May 1, 2015 through December 31, 2015, the Fund's portfolio turnover rate was 78.16% of the average value of its portfolio.
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. The Example reflects adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements by management as described above for the 1 Year numbers only. 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 employs an asset allocation strategy designed for investors who are expecting to retire and who are likely to stop making new investments in the Fund around the specific target year (target date), as indicated in the Fund’s name.

Under normal market conditions, the investment manager allocates the Fund’s assets among the broad asset classes of equity, fixed-income and alternative (non-traditional) investments by investing primarily in a distinctly-weighted combination of underlying funds, predominantly other Franklin Templeton mutual funds, based on each underlying fund's predominant asset class and strategy. A portion of the Fund’s assets may be invested in affiliated and unaffiliated exchange traded funds (ETFs). These underlying funds and ETFs, in turn, invest in a variety of U.S. and foreign equity, fixed-income and alternative investments. The alternative (or “non-traditional”) investment strategies that the underlying funds employ may include, but are not limited to, long/short equity, long/short credit, relative value, event driven and global macro strategies.

The investment manager uses a predetermined glide path as a guide in allocating the Fund’s assets among underlying funds in the broad asset classes. The target asset allocations in the glide path change over time, reducing their exposure to equity investments and becoming increasingly conservative until the stated target date. At approximately the target date, the Fund’s final asset allocation mix will be 30% equity funds, 65% fixed-income funds and 5% alternative investments funds. As of May 2016, the allocation of the Fund is approximately: 80% equity funds, 15% fixed-income funds and 5% alternative investments funds.

The underlying funds and the percentage allocations in the glide path may be changed from time to time by the Fund’s investment manager without the approval of shareholders, and, under normal market conditions, the percentage allocations for equity and fixed-income funds may vary up to 10% from the stated allocations, and the allocations for the alternative investments funds may vary up to 5%. The glide path is further described and illustrated in the “Fund Details” section.

When selecting equity funds, the investment manager considers the underlying funds’ foreign and domestic exposure, market capitalization ranges, and investment style (growth vs. value). When selecting fixed-income funds, the investment manager focuses primarily on maximizing income, appropriate to the Fund’s risk profile, and considers the credit quality, duration and maturity of the underlying funds’ portfolios. Certain fixed-income funds may hold securities across the credit quality spectrum, including below investment grade or "junk" bonds. In evaluating the risk level of the underlying funds, including alternative investments funds, the investment manager analyzes such factors as: (a) relative and absolute performance, including correlations with other underlying funds as well as corresponding benchmarks, and (b) their volatility (the variability of returns from one period to the next).

No more than 25% of the Fund’s assets may be invested in any one underlying fund, except that the Fund may invest up to 50% of its total assets in Franklin U.S. Government Securities Fund.

While the Fund is designed for investors expecting to retire around the target date, investors should also consider other factors besides their age or retirement date, such as their risk tolerance, personal circumstances, legal considerations, tax consequences and status, complete financial situation and needs and individual goals, some or all of which can change frequently. It is possible to lose money by investing in the Fund, including at and after the target date. The Fund does not guarantee a level of income or principal at or after the target date.
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.

Asset Allocation

The Fund’s ability to achieve its investment goal depends upon the investment manager’s skill in determining the Fund’s broad asset allocation mix and selecting underlying funds. There is the possibility that the investment manager’s evaluations and assumptions regarding asset classes and underlying funds will not successfully achieve the Fund's investment goal in view of actual market trends.

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.

Investing in ETFs

The Fund’s investment in ETFs may subject the Fund to additional risks than if the Fund would have invested directly in the ETFs’ underlying securities. These risks include the possibility that an ETF may experience a lack of liquidity that can result in greater volatility than its underlying securities; an ETF may trade at a premium or discount to its net asset value; or an ETF may not replicate exactly the performance of the benchmark index it seeks to track. In addition, investing in an ETF may also be more costly than if a Fund had owned the underlying securities directly. The Fund, and indirectly shareholders of the Fund, bears a proportionate share of the ETF’s expenses, which include management and advisory fees and other expenses. In addition, the Fund pays brokerage commissions in connection with the purchase and sale of shares of ETFs.

For purposes of the discussion below, “Fund” means the Fund and/or 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.

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.

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.

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.

Interest Rate

When interest rates rise, debt security prices generally fall. The opposite is also generally true: debt security prices rise when interest rates fall. Interest rate changes are influenced by a number of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, and supply and demand of bonds. In general, securities with longer maturities or durations are more sensitive to these interest rate changes.

Income

Because the Fund can only distribute what it earns, the Fund's distributions to shareholders may decline when prevailing interest rates fall or when the Fund experiences defaults on debt securities it holds.

Credit

An issuer of debt securities may fail to make interest payments and repay principal when due, in whole or in part. Changes in an issuer's financial strength or in a security's credit rating may affect a security's value. While securities issued by Ginnie Mae are backed by the full faith and credit of the U.S. government, not all securities of the various U.S. government agencies are, including those of Fannie Mae and Freddie Mac. Accordingly, securities issued by Fannie Mae and Freddie Mac may involve a risk of non-payment of principal and interest.

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.

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 Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's investment manager applies investment techniques and risk analyses in making investment decisions for the 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

Because the Fund does not yet have a full calendar year of performance, annual total return information is not available and therefore is not presented. You can obtain updated performance information at franklintempleton.com or by calling (800) DIAL BEN/342-5236.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Because the Fund does not yet have a full calendar year of performance, annual total return information is not available and therefore is not presented. You can obtain updated performance information at franklintempleton.com or by calling (800) DIAL BEN/342-5236.
Franklin Templeton Fund Allocator Series RTF-13 | Franklin LifeSmart™ 2055 Retirement Target 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 0.25%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25% [2]
Other expenses rr_OtherExpensesOverAssets 9.27%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.78% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 10.55% [3]
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (9.47%) [4]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.08% [3]
1 year rr_ExpenseExampleYear01 $ 679
3 years rr_ExpenseExampleYear03 2,633
5 years rr_ExpenseExampleYear05 4,377
10 years rr_ExpenseExampleYear10 $ 7,956
Franklin Templeton Fund Allocator Series RTF-13 | Franklin LifeSmart™ 2055 Retirement Target 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 0.25%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00% [2]
Other expenses rr_OtherExpensesOverAssets 9.27%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.78% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 11.30% [3]
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (9.47%) [4]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.83% [3]
1 year rr_ExpenseExampleYear01 $ 286
3 years rr_ExpenseExampleYear03 2,374
5 years rr_ExpenseExampleYear05 4,295
10 years rr_ExpenseExampleYear10 8,133
1 Year rr_ExpenseExampleNoRedemptionYear01 186
3 Years rr_ExpenseExampleNoRedemptionYear03 2,374
5 Years rr_ExpenseExampleNoRedemptionYear05 4,295
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 8,133
Franklin Templeton Fund Allocator Series RTF-13 | Franklin LifeSmart™ 2055 Retirement Target 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 0.25%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50% [2]
Other expenses rr_OtherExpensesOverAssets 9.27%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.78% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 10.80% [3]
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (9.47%) [4]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.33% [3]
1 year rr_ExpenseExampleYear01 $ 136
3 years rr_ExpenseExampleYear03 2,248
5 years rr_ExpenseExampleYear05 4,122
10 years rr_ExpenseExampleYear10 $ 7,935
Franklin Templeton Fund Allocator Series RTF-13 | Franklin LifeSmart™ 2055 Retirement Target Fund | Class R6  
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 0.25%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [2]
Other expenses rr_OtherExpensesOverAssets 9.79%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.78% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 10.82% [3]
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (10.04%) [4]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.78% [3]
1 year rr_ExpenseExampleYear01 $ 80
3 years rr_ExpenseExampleYear03 2,207
5 years rr_ExpenseExampleYear05 4,093
10 years rr_ExpenseExampleYear10 $ 7,928
Franklin Templeton Fund Allocator Series RTF-13 | Franklin LifeSmart™ 2055 Retirement Target 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 0.25%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [2]
Other expenses rr_OtherExpensesOverAssets 9.27%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.78% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 10.30% [3]
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (9.47%) [4]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.83% [3]
1 year rr_ExpenseExampleYear01 $ 85
3 years rr_ExpenseExampleYear03 2,120
5 years rr_ExpenseExampleYear05 3,944
10 years rr_ExpenseExampleYear10 $ 7,724
[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 and Class R 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.
[3] The Fund commenced operations on May 1, 2015. Total annual Fund operating expenses are annualized. 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.
[4] The investment manager has contractually agreed to waive or assume certain expenses so that total annual fund operating expenses (excluding Rule 12b-1 fees, acquired fund fees and expenses, and certain non-routine expenses) for each class of the Fund do not exceed (and could be less than) 0.05%, until April 30, 2017. The transfer agent has contractually agreed to cap transfer agency fees for Class R6 shares of the Fund so that transfer agency fees for that class do not exceed 0.01%, until at least April 30, 2017. Management also has contractually agreed in advance to reduce its fees as a result of the Fund's investment in a Franklin Templeton money fund (acquired fund) for at least the next 12-month period. Contractual fee waiver and/or expense reimbursement agreements may not be changed or terminated during the time period set forth above.