S000038877 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| MSCI ACWI ex USA Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 32.39% | 7.91% | 8.41% | |
| Northern Trust International Quality Dividend Dynamic Index℠ | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 37.56% | 11.51% | 10.41% | |
| FlexShares International Quality Dividend Dynamic Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 37.11% | 11.07% | 10.01% | ||
| FlexShares International Quality Dividend Dynamic Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 36.02% | 9.69% | 8.84% | ||
| FlexShares International Quality Dividend Dynamic Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 22.71% | 8.45% | 7.88% | ||
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