v3.26.3
Expense Example - ETF Class
Sep. 29, 2026
USD ($)
GMO Benchmark-Free Allocation Fund | GMO Benchmark-Free Allocation Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 137
Expense Example, with Redemption, 3 Years 491
Expense Example, with Redemption, 5 Years 869
Expense Example, with Redemption, 10 Years 1,929
GMO Global Asset Allocation Fund | GMO Global Asset Allocation Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 86
Expense Example, with Redemption, 3 Years 309
Expense Example, with Redemption, 5 Years 550
Expense Example, with Redemption, 10 Years 1,242
GMO Emerging Markets Fund | GMO Emerging Markets Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 105
Expense Example, with Redemption, 3 Years 375
Expense Example, with Redemption, 5 Years 665
Expense Example, with Redemption, 10 Years 1,492
GMO Emerging Markets ex-China Fund | GMO Emerging Markets ex-China Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 88
Expense Example, with Redemption, 3 Years 360
Expense Example, with Redemption, 5 Years 653
Expense Example, with Redemption, 10 Years 1,487
GMO Global Developed Equity Allocation Fund | GMO Global Developed Equity Allocation Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 55
Expense Example, with Redemption, 3 Years 223
Expense Example, with Redemption, 5 Years 405
Expense Example, with Redemption, 10 Years 933
GMO Global Equity Allocation Fund | GMO Global Equity Allocation Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 59
Expense Example, with Redemption, 3 Years 225
Expense Example, with Redemption, 5 Years 405
Expense Example, with Redemption, 10 Years 925
GMO International Developed Equity Allocation Fund | GMO International Developed Equity Allocation Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 64
Expense Example, with Redemption, 3 Years 247
Expense Example, with Redemption, 5 Years 445
Expense Example, with Redemption, 10 Years 1,018
GMO International Equity Allocation Fund | GMO International Equity Allocation Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 72
Expense Example, with Redemption, 3 Years 263
Expense Example, with Redemption, 5 Years 470
Expense Example, with Redemption, 10 Years 1,068
GMO International Equity Fund | GMO International Equity Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 77
Expense Example, with Redemption, 3 Years 272
Expense Example, with Redemption, 5 Years 484
Expense Example, with Redemption, 10 Years 1,094
GMO Quality Fund | GMO Quality Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 52
Expense Example, with Redemption, 3 Years 198
Expense Example, with Redemption, 5 Years 357
Expense Example, with Redemption, 10 Years 819
GMO U.S. Equity Fund | GMO U.S. Equity Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 50
Expense Example, with Redemption, 3 Years 203
Expense Example, with Redemption, 5 Years 359
Expense Example, with Redemption, 10 Years 851
GMO U.S. Small Cap Value Fund | GMO U.S. Small Cap Value Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 60
Expense Example, with Redemption, 3 Years 262
Expense Example, with Redemption, 5 Years 481
Expense Example, with Redemption, 10 Years 1,112
GMO Emerging Country Debt Fund | GMO Emerging Country Debt Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 231
Expense Example, with Redemption, 3 Years 403
Expense Example, with Redemption, 5 Years 591
Expense Example, with Redemption, 10 Years 1,135
GMO High Yield Fund | GMO High Yield Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 37
Expense Example, with Redemption, 3 Years 211
Expense Example, with Redemption, 5 Years 401
Expense Example, with Redemption, 10 Years 949
GMO Multi-Asset Credit Fund | GMO Multi-Asset Credit Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 62
Expense Example, with Redemption, 3 Years 312
Expense Example, with Redemption, 5 Years 581
Expense Example, with Redemption, 10 Years 1,349
GMO Opportunistic Income Fund | GMO Opportunistic Income Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 59
Expense Example, with Redemption, 3 Years 223
Expense Example, with Redemption, 5 Years 400
Expense Example, with Redemption, 10 Years 914
GMO Alternative Allocation Fund | GMO Alternative Allocation Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 293
Expense Example, with Redemption, 3 Years 952
Expense Example, with Redemption, 5 Years 1,636
Expense Example, with Redemption, 10 Years 3,457
GMO U.S. Treasury Fund | GMO U.S. Treasury Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 9
Expense Example, with Redemption, 3 Years 71
Expense Example, with Redemption, 5 Years 138
Expense Example, with Redemption, 10 Years $ 337