S000038876 [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 Index℠ | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 35.65% | 10.58% | 8.75% | |
| FlexShares International Quality Dividend Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 35.24% | 10.16% | 8.43% | ||
| FlexShares International Quality Dividend Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 34.17% | 8.76% | 7.19% | ||
| FlexShares International Quality Dividend Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 21.59% | 7.67% | 6.47% | ||
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