S000065837 [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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| Russell 1000® Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 17.37% | 13.59% | 14.99% | |
| Northern Trust Quality Low Volatility Index℠ | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 12.25% | 11.56% | 11.44% | |
| FlexShares US Quality Low Volatility Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 12.13% | 11.35% | 11.21% | ||
| Performance Inception Date | Jul. 15, 2019 | ||||
| FlexShares US Quality Low Volatility Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 11.69% | 10.93% | 10.81% | ||
| FlexShares US Quality Low Volatility Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 7.47% | 8.97% | 8.97% | ||
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