| 
											FlexShares Core Select Bond Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-5.91
									 | 
									
											-1.09
									 | 
									
											4.88
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Credit-Scored US Corporate Bond Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-3.70
									 | 
									
											5.08
									 | 
									
											10.37
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Credit-Scored US Long Corporate Bond Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-12.46
									 | 
									
											3.12
									 | 
									
											7.00
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Developed Markets ex-US Quality Low Volatility Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-6.02
									 | 
									
											34.32
									 | 
									
											-
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Disciplined Duration MBS Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-4.14
									 | 
									
											-5.05
									 | 
									
											2.92
									 | 
									
											
									 | 
							
							
									| 
											FlexShares ESG & Climate Emerging Markets Core Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-
									 | 
									
											-
									 | 
									
											-
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Emerging Markets Quality Low Volatility Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-10.56
									 | 
									
											24.64
									 | 
									
											-
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Global Quality Real Estate Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-24.16
									 | 
									
											31.84
									 | 
									
											-1.84
									 | 
									
											
									 | 
							
							
									| 
											FlexShares International Quality Dividend Defensive Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-9.20
									 | 
									
											42.25
									 | 
									
											-5.18
									 | 
									
											
									 | 
							
							
									| 
											FlexShares International Quality Dividend Dynamic Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-7.57
									 | 
									
											64.41
									 | 
									
											8.62
									 | 
									
											
									 | 
							
							
									| 
											FlexShares International Quality Dividend Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-6.67
									 | 
									
											49.74
									 | 
									
											-0.33
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Morningstar Developed Markets ex-US Factor Tilt Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-7.29
									 | 
									
											62.38
									 | 
									
											4.31
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Morningstar Emerging Markets Factor Tilt Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-11.40
									 | 
									
											43.03
									 | 
									
											-10.53
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Morningstar Global Upstream Natural Resources Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-7.63
									 | 
									
											129.81
									 | 
									
											45.58
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Morningstar US Market Factors Tilt Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-12.05
									 | 
									
											83.77
									 | 
									
											42.15
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Quality Dividend Defensive Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-6.92
									 | 
									
											58.47
									 | 
									
											37.46
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Quality Dividend Dynamic Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-10.30
									 | 
									
											84.50
									 | 
									
											42.97
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Quality Dividend Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-9.40
									 | 
									
											64.35
									 | 
									
											33.46
									 | 
									
											
									 | 
							
							
									| 
											FlexShares Real Assets Allocation Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-13.34
									 | 
									
											49.34
									 | 
									
											20.76
									 | 
									
											
									 | 
							
							
									| 
											FlexShares STOXX Global Broad Infrastructure Index Fund
									 | 
									
											
									 | 
									
											Flexshares Trust
									 | 
									
											USD
									 | 
									
											-8.88
									 | 
									
											33.81
									 | 
									
											22.17
									 | 
									
											
									 |