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S000033313 [Member] Annual Fund Operating Expenses - Northern Trust Morningstar Developed Markets ex-US Factor Tilt ETF
Oct. 31, 2025
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination March 1, 2027
FlexShares Morningstar Developed Markets ex-US Factor Tilt Index Fund  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.39%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.02%
Expenses (as a percentage of Assets) 0.41%
Fee Waiver or Reimbursement (0.02%) [1]
Net Expenses (as a percentage of Assets) 0.39%
[1] Northern Trust Investments, Inc. (“NTI”) has contractually agreed to reimburse a portion of the operating expenses of the Fund (other than 12b-1 Fees, Tax Expenses, Extraordinary Expenses, and Acquired Fund Fees and Expenses) to the extent the “Total Annual Fund Operating Expenses” exceed 0.39%. This contractual limitation may not be terminated before March 1, 2027 without the approval of the Fund’s Board of Trustees. The Fund’s Board of Trustees may terminate the contractual agreement at any time if it determines that it is in the best interest of the Fund and its shareholders.