S000054499 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 114 Months Ended | ||||
|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| STOXX® Global ESG Select KPIs Index℠ | |||||||
| Prospectus [Line Items] | |||||||
| Average Annual Return, Percent | [1],[2] | 23.64% | 12.48% | 13.27% | |||
| MSCI World Index | |||||||
| Prospectus [Line Items] | |||||||
| Average Annual Return, Percent | [2] | 21.09% | 12.15% | 12.52% | |||
| FlexShares STOXX Global ESG Select Index Fund | |||||||
| Prospectus [Line Items] | |||||||
| Average Annual Return, Percent | 23.58% | 12.42% | 13.22% | ||||
| Performance Inception Date | Jul. 13, 2016 | ||||||
| FlexShares STOXX Global ESG Select Index Fund | After Taxes on Distributions | |||||||
| Prospectus [Line Items] | |||||||
| Average Annual Return, Percent | 23.14% | 11.96% | 12.74% | ||||
| FlexShares STOXX Global ESG Select Index Fund | After Taxes on Distributions and Sales | |||||||
| Prospectus [Line Items] | |||||||
| Average Annual Return, Percent | 14.22% | 9.82% | 10.90% | ||||
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