v3.26.1
Expense Example - LOOMIS SAYLES FUNDS II
Dec. 31, 2025
USD ($)
Loomis Sayles High Income Fund | Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 518
Expense Example, with Redemption, 3 Years 793
Expense Example, with Redemption, 5 Years 1,088
Expense Example, with Redemption, 10 Years 1,927
Loomis Sayles High Income Fund | Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 273
Expense Example, with Redemption, 3 Years 615
Expense Example, with Redemption, 5 Years 1,084
Expense Example, with Redemption, 10 Years 2,188
Loomis Sayles High Income Fund | Class N  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 66
Expense Example, with Redemption, 3 Years 288
Expense Example, with Redemption, 5 Years 527
Expense Example, with Redemption, 10 Years 1,214
Loomis Sayles High Income Fund | Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 72
Expense Example, with Redemption, 3 Years 306
Expense Example, with Redemption, 5 Years 559
Expense Example, with Redemption, 10 Years 1,283
Loomis Sayles International Growth Fund | Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 690
Expense Example, with Redemption, 3 Years 1,076
Expense Example, with Redemption, 5 Years 1,485
Expense Example, with Redemption, 10 Years 2,625
Loomis Sayles International Growth Fund | Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 298
Expense Example, with Redemption, 3 Years 753
Expense Example, with Redemption, 5 Years 1,334
Expense Example, with Redemption, 10 Years 2,738
Loomis Sayles International Growth Fund | Class N  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 428
Expense Example, with Redemption, 5 Years 787
Expense Example, with Redemption, 10 Years 1,800
Loomis Sayles International Growth Fund | Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 97
Expense Example, with Redemption, 3 Years 454
Expense Example, with Redemption, 5 Years 835
Expense Example, with Redemption, 10 Years 1,906
Loomis Sayles Investment Grade Bond Fund | Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 496
Expense Example, with Redemption, 3 Years 659
Expense Example, with Redemption, 5 Years 835
Expense Example, with Redemption, 10 Years 1,346
Loomis Sayles Investment Grade Bond Fund | Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 251
Expense Example, with Redemption, 3 Years 478
Expense Example, with Redemption, 5 Years 829
Expense Example, with Redemption, 10 Years 1,617
Loomis Sayles Investment Grade Bond Fund | Class N  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 44
Expense Example, with Redemption, 3 Years 142
Expense Example, with Redemption, 5 Years 250
Expense Example, with Redemption, 10 Years 565
Loomis Sayles Investment Grade Bond Fund | Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 49
Expense Example, with Redemption, 3 Years 165
Expense Example, with Redemption, 5 Years 291
Expense Example, with Redemption, 10 Years 660
Loomis Sayles Investment Grade Bond Fund | Admin Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 100
Expense Example, with Redemption, 3 Years 323
Expense Example, with Redemption, 5 Years 564
Expense Example, with Redemption, 10 Years 1,255
Loomis Sayles Strategic Income Fund | Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 515
Expense Example, with Redemption, 3 Years 722
Expense Example, with Redemption, 5 Years 947
Expense Example, with Redemption, 10 Years 1,591
Loomis Sayles Strategic Income Fund | Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 270
Expense Example, with Redemption, 3 Years 543
Expense Example, with Redemption, 5 Years 941
Expense Example, with Redemption, 10 Years 1,858
Loomis Sayles Strategic Income Fund | Class N  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 63
Expense Example, with Redemption, 3 Years 207
Expense Example, with Redemption, 5 Years 364
Expense Example, with Redemption, 10 Years 819
Loomis Sayles Strategic Income Fund | Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 68
Expense Example, with Redemption, 3 Years 232
Expense Example, with Redemption, 5 Years 409
Expense Example, with Redemption, 10 Years 923
Loomis Sayles Strategic Income Fund | Admin Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 119
Expense Example, with Redemption, 3 Years 389
Expense Example, with Redemption, 5 Years 679
Expense Example, with Redemption, 10 Years $ 1,504