S000073359 [Member] Average Annual Total Returns |
12 Months Ended | 51 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
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| Northern Trust ESG & Climate Developed Markets ex-US Core Index℠ | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | [1] | 27.20% | 7.03% | |
| MSCI World ex-US Index | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | [1] | 31.85% | 8.58% | |
| FlexShares ESG & Climate Developed Markets ex-US Core Index Fund | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 27.27% | 7.06% | ||
| Performance Inception Date | Sep. 20, 2021 | |||
| FlexShares ESG & Climate Developed Markets ex-US Core Index Fund | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 26.26% | 6.47% | ||
| FlexShares ESG & Climate Developed Markets ex-US Core Index Fund | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 16.66% | 5.50% | ||
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