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Revenue from Contracts with Customers - Differences Due to Adoption Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 01, 2018
Sep. 02, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net sales $ 624.6 $ 580.3
Cost of sales 399.5 363.4
Gross margin 225.1 216.9
Total operating expenses 179.1 167.4
Operating Earnings (Loss): 46.0 49.5
Income tax expense 8.9 14.2
Net earnings 35.9 33.1
Net income attributable to Herman Miller, Inc. 35.8 $ 33.1
Performance Obligation Change | Accounting Standards Update 2014-09    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net sales (10.7)  
Cost of sales (5.8)  
Gross margin (4.9)  
Total operating expenses (0.1)  
Operating Earnings (Loss): (4.8)  
Income tax expense (1.1)  
Net income attributable to Herman Miller, Inc. (3.7)  
Gross vs. Net Change | Accounting Standards Update 2014-09    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net sales (8.5)  
Cost of sales (8.5)  
Legacy GAAP    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net sales 605.4  
Cost of sales 385.2  
Gross margin 220.2  
Total operating expenses 179.0  
Operating Earnings (Loss): 41.2  
Income tax expense 7.8  
Net income attributable to Herman Miller, Inc. $ 32.2