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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Dec. 30, 2019
Entity Registrant Name dei_EntityRegistrantName PUTNAM FUNDS TRUST
Entity Central Index Key dei_EntityCentralIndexKey 0001005942
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Document Effective Date dei_DocumentEffectiveDate Oct. 19, 2020
Putnam Emerging Markets Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Strategy [Heading] rr_StrategyHeading Effective October 19, 2020, the sub-section  Investments in the section  Fund summary – Investments, risks, and performance is deleted in its entirety and replaced with the following:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

We invest mainly in common stocks (growth or value stocks or both) of emerging market companies of any size that we believe have favorable investment potential. For example, we may purchase stocks of companies with stock prices that reflect a value lower than that which we place on the company. We may also consider other factors that we believe will cause the stock price to rise. Under normal circumstances, we invest at least 80% of the fund’s net assets in equity securities of emerging market companies. This policy may be changed only after 60 days’ notice to shareholders.

Emerging markets include countries in the MSCI Emerging Market Index or that we consider to be emerging markets based on our evaluation of their level of economic development or the size and nature of their securities markets. We may consider, among other factors, a company’s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments. We may also use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and non-hedging purposes.