S000034352 [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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| Bloomberg U.S. Aggregate Bond Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 7.30% | (0.36%) | 2.01% | |
| Bloomberg US TIPS Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 7.01% | 1.13% | 3.08% | |
| iBoxx 5-Year Target Duration TIPS Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 7.94% | 2.01% | 3.38% | |
| FlexShares iBoxx 5-Year Target Duration TIPS Index Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 7.86% | 1.83% | 3.21% | ||
| FlexShares iBoxx 5-Year Target Duration TIPS Index Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 5.88% | (0.14%) | 1.82% | ||
| FlexShares iBoxx 5-Year Target Duration TIPS Index Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 4.63% | 0.54% | 1.87% | ||
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