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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName PUTNAM CONVERTIBLE SECURITIES FUND
Prospectus Date rr_ProspectusDate Feb. 28, 2014
PUTNAM CONVERTIBLE SECURITIES FUND
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund summary
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Putnam Convertible Securities Fund seeks, with equal emphasis, current income and capital appreciation.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock Its secondary objective is conservation of capital.
Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses 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 $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 14 of the fund’s prospectus and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
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 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-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 72%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 72.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 14 of the fund’s prospectus and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.
Strategy [Heading] rr_StrategyHeading Investments
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock We invest mainly in convertible securities of U.S. companies. Convertible securities combine the investment characteristics of bonds and common stocks. Convertible securities include bonds, preferred stocks and other instruments that can be converted into or exchanged for common stock or equivalent value. A significant portion of the convertible securities we buy are below- investment-grade. The convertible bonds we buy usually have intermediate-to long-term stated maturities (three years or longer), but often contain “put” features, which allow bondholders to sell the bond back to the company under specified circumstances, that result in shorter effective maturities. When deciding whether to buy or sell investments, we may consider, among other factors: (i) a security’s structural features, such as its position in a company’s capital structure and “put” and “call” features (a company’s right to repurchase the security under specified circumstances is a “call” feature); (ii) credit and prepayment risks; and (iii) with respect to a company’s common stock underlying a convertible security, the stock’s valuation and the company’s financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock It is important to understand that you can lose money by investing in the fund.

The value of convertible securities in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including both general financial market conditions and factors related to a specific company or industry. These risks are generally greater for convertible securities issued by small and midsize companies (which may constitute a significant portion of the fund’s investments from time to time). The value of convertible securities may be adversely affected by changes in the prices of underlying common stocks. Convertible securities tend to provide higher yields than common stocks. However, a higher yield may not protect investors against the risk of loss or adequately mitigate any loss associated with a decline in the price of a convertible security. Convertible securities are subject to credit risk, which is the risk that an issuer of the fund’s investments may default on payment of interest or principal. The value of convertible securities is also affected by changing market perceptions of the risk of default. Credit risk is generally greater for below-investment-grade convertible securities (a significant part of the fund’s investments). Generally, convertible securities may be less sensitive to interest rate changes than non-convertible bonds as a result of convertible securities’ convertibility and “put” features. Interest rate risk is generally greater for longer-term bonds and convertible securities whose underlying stock price has fallen significantly below the conversion price.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges. If it did, performance would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best calendar
quarter
Q2 2009		 19.05%
Worst calendar
quarter
Q4 2008		 -26.03%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.05%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.03%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges
(for periods ending 12/31/13)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect 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 shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.

Class B share performance reflects conversion to class A shares after eight years.
PUTNAM CONVERTIBLE SECURITIES FUND | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 1.08%
1 year rr_ExpenseExampleYear01 679
3 years rr_ExpenseExampleYear03 899
5 years rr_ExpenseExampleYear05 1,136
10 years rr_ExpenseExampleYear10 1,816
2004 rr_AnnualReturn2004 11.36%
2005 rr_AnnualReturn2005 2.07%
2006 rr_AnnualReturn2006 14.55%
2007 rr_AnnualReturn2007 5.88%
2008 rr_AnnualReturn2008 (39.46%)
2009 rr_AnnualReturn2009 53.75%
2010 rr_AnnualReturn2010 19.55%
2011 rr_AnnualReturn2011 (6.47%)
2012 rr_AnnualReturn2012 15.09%
2013 rr_AnnualReturn2013 21.96%
1 year rr_AverageAnnualReturnYear01 14.94%
5 years rr_AverageAnnualReturnYear05 17.86%
10 years rr_AverageAnnualReturnYear10 6.62%
PUTNAM CONVERTIBLE SECURITIES FUND | 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 original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther 5.00% [2]
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 1.83%
1 year rr_ExpenseExampleYear01 686
3 years rr_ExpenseExampleYear03 876
5 years rr_ExpenseExampleYear05 1,190
10 years rr_ExpenseExampleYear10 1,951
1 year rr_ExpenseExampleNoRedemptionYear01 186
3 years rr_ExpenseExampleNoRedemptionYear03 576
5 years rr_ExpenseExampleNoRedemptionYear05 990
10 years rr_ExpenseExampleNoRedemptionYear10 1,951
1 year rr_AverageAnnualReturnYear01 16.03%
5 years rr_AverageAnnualReturnYear05 18.16%
10 years rr_AverageAnnualReturnYear10 6.60%
PUTNAM CONVERTIBLE SECURITIES FUND | 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 original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 1.83%
1 year rr_ExpenseExampleYear01 286
3 years rr_ExpenseExampleYear03 576
5 years rr_ExpenseExampleYear05 990
10 years rr_ExpenseExampleYear10 2,148
1 year rr_ExpenseExampleNoRedemptionYear01 186
3 years rr_ExpenseExampleNoRedemptionYear03 576
5 years rr_ExpenseExampleNoRedemptionYear05 990
10 years rr_ExpenseExampleNoRedemptionYear10 2,148
1 year rr_AverageAnnualReturnYear01 20.04%
5 years rr_AverageAnnualReturnYear05 18.37%
10 years rr_AverageAnnualReturnYear10 6.45%
PUTNAM CONVERTIBLE SECURITIES FUND | Class M
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.50%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther 0.65% [1]
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 1.58%
1 year rr_ExpenseExampleYear01 505
3 years rr_ExpenseExampleYear03 831
5 years rr_ExpenseExampleYear05 1,180
10 years rr_ExpenseExampleYear10 2,163
1 year rr_AverageAnnualReturnYear01 17.16%
5 years rr_AverageAnnualReturnYear05 17.84%
10 years rr_AverageAnnualReturnYear10 6.34%
PUTNAM CONVERTIBLE SECURITIES FUND | Class R
  
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 original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 1.33%
1 year rr_ExpenseExampleYear01 135
3 years rr_ExpenseExampleYear03 421
5 years rr_ExpenseExampleYear05 729
10 years rr_ExpenseExampleYear10 1,601
1 year rr_AverageAnnualReturnYear01 21.69%
5 years rr_AverageAnnualReturnYear05 18.97%
10 years rr_AverageAnnualReturnYear10 6.99%
PUTNAM CONVERTIBLE SECURITIES FUND | Class Y
  
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 original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets   
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 0.83%
1 year rr_ExpenseExampleYear01 85
3 years rr_ExpenseExampleYear03 265
5 years rr_ExpenseExampleYear05 460
10 years rr_ExpenseExampleYear10 $ 1,025
1 year rr_AverageAnnualReturnYear01 22.27%
5 years rr_AverageAnnualReturnYear05 19.56%
10 years rr_AverageAnnualReturnYear10 7.52%
PUTNAM CONVERTIBLE SECURITIES FUND | after taxes on distributions | Class A
  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 13.82%
5 years rr_AverageAnnualReturnYear05 16.82%
10 years rr_AverageAnnualReturnYear10 5.79%
PUTNAM CONVERTIBLE SECURITIES FUND | after taxes on distributions and sale of fund shares | Class A
  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 8.52%
5 years rr_AverageAnnualReturnYear05 14.13%
10 years rr_AverageAnnualReturnYear10 5.06%
PUTNAM CONVERTIBLE SECURITIES FUND | BofA Merrill Lynch All U.S. Convertibles Index ( no d eduction for f ees, expenses or t axes)
  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 24.92%
5 years rr_AverageAnnualReturnYear05 18.85%
10 years rr_AverageAnnualReturnYear10 7.13%
[1] Applies only to certain redemptions of shares bought with no initial sales charge.
[2] This charge is phased out over six years.
[3] This charge is eliminated after one year.