v3.25.4
Class A C R R6 Y [Member] Expense Example - Class A C R R6 Y - PUTNAM CONVERTIBLE SECURITIES FUND
Oct. 31, 2025
USD ($)
Class C Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 280
Expense Example, with Redemption, 3 Years 558
Expense Example, with Redemption, 5 Years 960
Expense Example, with Redemption, 10 Years 1,885
Class A Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 672
Expense Example, with Redemption, 3 Years 878
Expense Example, with Redemption, 5 Years 1,101
Expense Example, with Redemption, 10 Years 1,741
Class R Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 128
Expense Example, with Redemption, 3 Years 399
Expense Example, with Redemption, 5 Years 691
Expense Example, with Redemption, 10 Years 1,522
Class Y Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 78
Expense Example, with Redemption, 3 Years 243
Expense Example, with Redemption, 5 Years 423
Expense Example, with Redemption, 10 Years 944
Class R6 Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 73
Expense Example, with Redemption, 3 Years 228
Expense Example, with Redemption, 5 Years 396
Expense Example, with Redemption, 10 Years $ 882