S000065839 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 78 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| MSCI Emerging Markets Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 33.57% | 4.20% | 6.99% | |
| Northern Trust Emerging Markets Quality Low Volatility Index℠ | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 22.08% | 6.10% | 6.25% | |
| FlexShares Emerging Markets Quality Low Volatility Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 21.72% | 5.20% | 5.44% | ||
| Performance Inception Date | Jul. 15, 2019 | ||||
| FlexShares Emerging Markets Quality Low Volatility Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 20.76% | 4.70% | 4.96% | ||
| FlexShares Emerging Markets Quality Low Volatility Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 13.44% | 4.14% | 4.35% | ||
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