v3.25.4
Annual Fund Operating Expenses - PUTNAM MORTGAGE SECURITIES FUND
Sep. 30, 2025
Class A Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.37%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.30%
Expenses (as a percentage of Assets) 0.92%
Class C Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.37%
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.30%
Expenses (as a percentage of Assets) 1.67%
Class R Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.37%
Distribution and Service (12b-1) Fees 0.50%
Other Expenses (as a percentage of Assets): 0.30%
Expenses (as a percentage of Assets) 1.17%
Class Y Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.37%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.30%
Expenses (as a percentage of Assets) 0.67%
Class R6 Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.37%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.14%
Expenses (as a percentage of Assets) 0.51%