S000038873 [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 Index℠ | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 17.11% | 13.09% | 12.25% | |
| FlexShares Quality Dividend Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 16.65% | 12.67% | 11.73% | ||
| FlexShares Quality Dividend Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 16.07% | 12.03% | 10.92% | ||
| FlexShares Quality Dividend Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 10.07% | 9.94% | 9.42% | ||
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