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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Nov. 30, 2016
Registrant Name dei_EntityRegistrantName PUTNAM MULTI-CAP GROWTH FUND
Central Index Key dei_EntityCentralIndexKey 0000865177
Amendment Flag dei_AmendmentFlag false
Trading Symbol dei_TradingSymbol PNOPX
Document Creation Date dei_DocumentCreationDate Aug. 01, 2016
Document Effective Date dei_DocumentEffectiveDate Sep. 01, 2016
Prospectus Date rr_ProspectusDate Oct. 30, 2015
Putnam Multi-Cap Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses
(expenses you pay each year as a percentage of the value of your investment)
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent

Restated to reflect current fees resulting from a change to the fund’s investor servicing arrangements effective September 1, 2016
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.
Putnam Multi-Cap Growth Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.56% [1]
Distribution and Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.26% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.07%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 678
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 896
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,131
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,806
Putnam Multi-Cap Growth Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.56% [1]
Distribution and Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.26% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 685
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 873
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,185
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,940
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 185
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 573
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 985
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,940
Putnam Multi-Cap Growth Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.56% [1]
Distribution and Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.26% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 285
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 573
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 985
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,137
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 185
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 573
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 985
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,137
Putnam Multi-Cap Growth Fund | Class M  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.56% [1]
Distribution and Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses rr_OtherExpensesOverAssets 0.26% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 504
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 828
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,175
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,152
Putnam Multi-Cap Growth Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.56% [1]
Distribution and Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.26% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.32%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 134
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 418
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 723
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,590
Putnam Multi-Cap Growth Fund | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.56% [1]
Other expenses rr_OtherExpensesOverAssets 0.26% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 84
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 455
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,014
[1] Management fees are subject to a performance adjustment.
[2] Restated to reflect current fees resulting from a change to the fund's investor servicing arrangements effective September 1, 2016.