00010 - Document - Document and Entity Information {Elements}
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00020 - Document - Risk/Return Summary (GMO Benchmark-Free Allocation Fund) {Unlabeled}
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00030 - Disclosure - Risk/Return Detail Data (GMO Benchmark-Free Allocation Fund) {Elements}
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00040 - Document - Risk/Return Summary (GMO Global Asset Allocation Fund) {Unlabeled}
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00050 - Disclosure - Risk/Return Detail Data (GMO Global Asset Allocation Fund) {Elements}
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00060 - Document - Risk/Return Summary (GMO Global Equity Allocation Fund) {Unlabeled}
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00070 - Disclosure - Risk/Return Detail Data (GMO Global Equity Allocation Fund) {Elements}
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00080 - Document - Risk/Return Summary (GMO Global Developed Equity Allocation Fund) {Unlabeled}
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00090 - Disclosure - Risk/Return Detail Data (GMO Global Developed Equity Allocation Fund) {Elements}
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00100 - Document - Risk/Return Summary (GMO International Equity Allocation Fund) {Unlabeled}
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00110 - Disclosure - Risk/Return Detail Data (GMO International Equity Allocation Fund) {Elements}
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00120 - Document - Risk/Return Summary (GMO International Developed Equity Allocation Fund) {Unlabeled}
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00130 - Disclosure - Risk/Return Detail Data (GMO International Developed Equity Allocation Fund) {Elements}
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00140 - Document - Risk/Return Summary (GMO Benchmark-Free Fund) {Unlabeled}
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00150 - Disclosure - Risk/Return Detail Data (GMO Benchmark-Free Fund) {Elements}
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00160 - Document - Risk/Return Summary (GMO Implementation Fund) {Unlabeled}
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00170 - Disclosure - Risk/Return Detail Data (GMO Implementation Fund) {Elements}
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00180 - Document - Risk/Return Summary (GMO Risk Premium Fund) {Unlabeled}
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00190 - Disclosure - Risk/Return Detail Data (GMO Risk Premium Fund) {Elements}
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00200 - Document - Risk/Return Summary (GMO Strategic Opportunities Allocation Fund) {Unlabeled}
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00210 - Disclosure - Risk/Return Detail Data (GMO Strategic Opportunities Allocation Fund) {Elements}
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