S000043008 [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 World Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 21.09% | 12.15% | 12.17% | |
| FTSE EPRA/NAREIT Developed Index℠ | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 9.58% | 2.76% | 3.25% | |
| Northern Trust Global Quality Real Estate Index℠ | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 8.46% | 3.61% | 3.57% | |
| FlexShares Global Quality Real Estate Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 8.58% | 3.80% | 3.68% | ||
| FlexShares Global Quality Real Estate Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 6.72% | 2.60% | 2.49% | ||
| FlexShares Global Quality Real Estate Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 5.26% | 2.50% | 2.41% | ||
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