S000065838 [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 World ex-US Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 31.85% | 9.47% | 9.55% | |
| Northern Trust Developed Markets ex-US Quality Low Volatility Index℠ | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 23.45% | 6.98% | 6.91% | |
| FlexShares Developed Markets ex-US Quality Low Volatility Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 23.56% | 6.87% | 6.74% | ||
| Performance Inception Date | Jul. 15, 2019 | ||||
| FlexShares Developed Markets ex-US Quality Low Volatility Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 22.59% | 6.24% | 6.15% | ||
| FlexShares Developed Markets ex-US Quality Low Volatility Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 14.40% | 5.38% | 5.31% | ||
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