S000042071 [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 Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 22.34% | 11.19% | 11.72% | |
| STOXX® Global Broad Infrastructure Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 18.11% | 5.76% | 7.02% | |
| S&P Global Infrastructure NR Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 21.54% | 10.02% | 8.47% | |
| FlexShares STOXX Global Broad Infrastructure Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 18.12% | 5.85% | 7.13% | ||
| FlexShares STOXX Global Broad Infrastructure Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 15.78% | 4.87% | 6.27% | ||
| FlexShares STOXX Global Broad Infrastructure Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 11.16% | 4.34% | 5.53% | ||
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