Class I [Member] Expense Example - Class I - PUTNAM CONVERTIBLE SECURITIES FUND - CLASS I	Oct. 31, 2025 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 69
Expense Example, with Redemption, 3 Years	217
Expense Example, with Redemption, 5 Years	378
Expense Example, with Redemption, 10 Years	$ 846

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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