v3.26.1
Expense Example
Mar. 31, 2026
USD ($)
Mercer US Small/Mid Cap Equity Fund | Mercer US Small/Mid Cap Equity Fund | Adviser Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 103
Expense Example, with Redemption, 3 Years 362
Expense Example, with Redemption, 5 Years 641
Expense Example, with Redemption, 10 Years 1,438
Mercer US Small/Mid Cap Equity Fund | Mercer US Small/Mid Cap Equity Fund | Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 78
Expense Example, with Redemption, 3 Years 284
Expense Example, with Redemption, 5 Years 507
Expense Example, with Redemption, 10 Years 1,149
Mercer US Small/Mid Cap Equity Fund | Mercer US Small/Mid Cap Equity Fund | Class Y-2  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 67
Expense Example, with Redemption, 3 Years 252
Expense Example, with Redemption, 5 Years 453
Expense Example, with Redemption, 10 Years 1,031
Mercer US Small/Mid Cap Equity Fund | Mercer US Small/Mid Cap Equity Fund | Class Y-3  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 52
Expense Example, with Redemption, 3 Years 205
Expense Example, with Redemption, 5 Years 371
Expense Example, with Redemption, 10 Years 853
Mercer Non-US Core Equity Fund | Mercer Non-US Core Equity Fund | Adviser Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 90
Expense Example, with Redemption, 3 Years 328
Expense Example, with Redemption, 5 Years 585
Expense Example, with Redemption, 10 Years 1,320
Mercer Non-US Core Equity Fund | Mercer Non-US Core Equity Fund | Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 64
Expense Example, with Redemption, 3 Years 249
Expense Example, with Redemption, 5 Years 450
Expense Example, with Redemption, 10 Years 1,029
Mercer Non-US Core Equity Fund | Mercer Non-US Core Equity Fund | Class Y-2  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 54
Expense Example, with Redemption, 3 Years 218
Expense Example, with Redemption, 5 Years 395
Expense Example, with Redemption, 10 Years 910
Mercer Non-US Core Equity Fund | Mercer Non-US Core Equity Fund | Class Y-3  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 39
Expense Example, with Redemption, 3 Years 170
Expense Example, with Redemption, 5 Years 313
Expense Example, with Redemption, 10 Years 729
Mercer Emerging Markets Equity Fund | Mercer Emerging Markets Equity Fund | Adviser Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 87
Expense Example, with Redemption, 3 Years 336
Expense Example, with Redemption, 5 Years 604
Expense Example, with Redemption, 10 Years 1,371
Mercer Emerging Markets Equity Fund | Mercer Emerging Markets Equity Fund | Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 61
Expense Example, with Redemption, 3 Years 257
Expense Example, with Redemption, 5 Years 469
Expense Example, with Redemption, 10 Years 1,080
Mercer Emerging Markets Equity Fund | Mercer Emerging Markets Equity Fund | Class Y-2  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 51
Expense Example, with Redemption, 3 Years 225
Expense Example, with Redemption, 5 Years 415
Expense Example, with Redemption, 10 Years 962
Mercer Emerging Markets Equity Fund | Mercer Emerging Markets Equity Fund | Class Y-3  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 36
Expense Example, with Redemption, 3 Years 178
Expense Example, with Redemption, 5 Years 332
Expense Example, with Redemption, 10 Years 782
Mercer Core Fixed Income Fund | Mercer Core Fixed Income Fund | Adviser Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 66
Expense Example, with Redemption, 3 Years 249
Expense Example, with Redemption, 5 Years 447
Expense Example, with Redemption, 10 Years 1,020
Mercer Core Fixed Income Fund | Mercer Core Fixed Income Fund | Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 41
Expense Example, with Redemption, 3 Years 170
Expense Example, with Redemption, 5 Years 310
Expense Example, with Redemption, 10 Years 720
Mercer Core Fixed Income Fund | Mercer Core Fixed Income Fund | Class Y-2  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 31
Expense Example, with Redemption, 3 Years 138
Expense Example, with Redemption, 5 Years 255
Expense Example, with Redemption, 10 Years 598
Mercer Core Fixed Income Fund | Mercer Core Fixed Income Fund | Class Y-3  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 15
Expense Example, with Redemption, 3 Years 90
Expense Example, with Redemption, 5 Years 172
Expense Example, with Redemption, 10 Years 412
Mercer Opportunistic Fixed Income Fund | Mercer Opportunistic Fixed Income Fund | Adviser Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 102
Expense Example, with Redemption, 3 Years 357
Expense Example, with Redemption, 5 Years 632
Expense Example, with Redemption, 10 Years 1,416
Mercer Opportunistic Fixed Income Fund | Mercer Opportunistic Fixed Income Fund | Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 77
Expense Example, with Redemption, 3 Years 278
Expense Example, with Redemption, 5 Years 497
Expense Example, with Redemption, 10 Years 1,127
Mercer Opportunistic Fixed Income Fund | Mercer Opportunistic Fixed Income Fund | Class Y-2  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 66
Expense Example, with Redemption, 3 Years 247
Expense Example, with Redemption, 5 Years 443
Expense Example, with Redemption, 10 Years 1,009
Mercer Opportunistic Fixed Income Fund | Mercer Opportunistic Fixed Income Fund | Class Y-3  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 51
Expense Example, with Redemption, 3 Years 199
Expense Example, with Redemption, 5 Years 361
Expense Example, with Redemption, 10 Years 830
Mercer Short Duration Fixed Income Fund | Mercer Short Duration Fixed Income Fund | Adviser Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 72
Expense Example, with Redemption, 3 Years 310
Expense Example, with Redemption, 5 Years 567
Expense Example, with Redemption, 10 Years 1,304
Mercer Short Duration Fixed Income Fund | Mercer Short Duration Fixed Income Fund | Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 231
Expense Example, with Redemption, 5 Years 432
Expense Example, with Redemption, 10 Years 1,012
Mercer Short Duration Fixed Income Fund | Mercer Short Duration Fixed Income Fund | Class Y-2  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 36
Expense Example, with Redemption, 3 Years 200
Expense Example, with Redemption, 5 Years 377
Expense Example, with Redemption, 10 Years 893
Mercer Short Duration Fixed Income Fund | Mercer Short Duration Fixed Income Fund | Class Y-3  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 20
Expense Example, with Redemption, 3 Years 152
Expense Example, with Redemption, 5 Years 295
Expense Example, with Redemption, 10 Years $ 712