v3.26.3
Prospectus 1 [Member] Expense Example - Prospectus 1 - PUTNAM MORTGAGE OPPORTUNITIES FUND
May 31, 2026
USD ($)
Class Y Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 62
Expense Example, with Redemption, 3 Years 232
Expense Example, with Redemption, 5 Years 416
Expense Example, with Redemption, 10 Years 950
Class A Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 484
Expense Example, with Redemption, 3 Years 698
Expense Example, with Redemption, 5 Years 930
Expense Example, with Redemption, 10 Years 1,595
Class C Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 264
Expense Example, with Redemption, 3 Years 546
Expense Example, with Redemption, 5 Years 953
Expense Example, with Redemption, 10 Years 1,889
Class R6 Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 51
Expense Example, with Redemption, 3 Years 200
Expense Example, with Redemption, 5 Years 361
Expense Example, with Redemption, 10 Years $ 831