v3.26.1
Shareholder Report
 6 Months Ended
Jan. 31, 2026
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Putnam Funds Trust
Entity Central Index Key 0001005942
Entity Investment Company Type N-1A
Document Period End Date Jan. 31, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Class P  
Shareholder Report [Line Items]  
Fund Name Putnam Short Term Investment Fund
Class Name Class P
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Short Term Investment Fund for the period August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-internalusefunds-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-internalusefunds-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class P
$2
0.03%
[1],[2]
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03%
Net Assets $ 1,692,137,749
Holdings Count | $ / shares 96
Investment Company Portfolio Turnover 40.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Total Net Assets
$1,692,137,749
Total Number of Portfolio Holdings
96
Portfolio Turnover Rate
40%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Portfolio Composition* (% of Total Investments)
image
 [3]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-internalusefunds-documents
Class G  
Shareholder Report [Line Items]  
Fund Name Putnam Short Term Investment Fund
Class Name Class G
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Short Term Investment Fund for the period August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-internalusefunds-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-internalusefunds-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class G
$2
0.03%
[4],[5]
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03%
Net Assets $ 1,692,137,749
Holdings Count | $ / shares 96
Investment Company Portfolio Turnover 40.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Total Net Assets
$1,692,137,749
Total Number of Portfolio Holdings
96
Portfolio Turnover Rate
40%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Portfolio Composition* (% of Total Investments)
image
 [6]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-internalusefunds-documents
[1]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[2]
† Annualized.
[3]
* Does not include derivatives, except purchased options, if any.  
[4]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[5]
† Annualized.
[6]
* Does not include derivatives, except purchased options, if any.