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Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 29, 2015
Aug. 30, 2014
Redeemable Noncontrolling Interest [Line Items]    
Redeemable Noncontrolling Interests, Beginning $ 30.4  
Redeemable Noncontrolling Interests, Ending 31.5  
Herman Miller Consumer Holdings    
Redeemable Noncontrolling Interest [Line Items]    
Redeemable Noncontrolling Interests, Beginning 30.4 $ 0.0
Increase due to business combination 0.0 25.7
Net income attributable to redeemable noncontrolling interests 0.2 0.0
Noncontrolling interests redemption value adjustment 0.8 0.0
Other adjustments 0.1 0.1
Redeemable Noncontrolling Interests, Ending $ 31.5 $ 25.8