v3.26.1
S000034097 [Member] Expense Example, No Redemption - Loomis Sayles Senior Floating Rate and Fixed Income Fund - Class C
Nov. 30, 2025
USD ($)
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 177
Expense Example, No Redemption, 3 Years 565
Expense Example, No Redemption, 5 Years 978
Expense Example, No Redemption, 10 Years $ 1,934