S000038875 [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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| Russell 1000® Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 17.37% | 13.59% | 14.59% | |
| Northern Trust Quality Dividend Defensive Index℠ | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 17.71% | 13.80% | 12.62% | |
| FlexShares Quality Dividend Defensive Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 17.28% | 13.39% | 12.11% | ||
| FlexShares Quality Dividend Defensive Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 16.69% | 12.77% | 11.27% | ||
| FlexShares Quality Dividend Defensive Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 10.48% | 10.56% | 9.75% | ||
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