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Stock-Based Compensation HMCH Stock-Based Compensation - Schedule of Fair Value of Employee Stock Options (Details) - $ / shares
12 Months Ended
Aug. 22, 2018
Jul. 16, 2018
Jul. 18, 2017
Jul. 19, 2016
Jun. 02, 2018
Share-based Compensation Arrangement by Share-based Payment Award          
Risk-free interest rate 3.00% 3.00% 2.00% 1.00%  
Expected term of options 4 years 4 months 24 days 4 years 4 months 24 days 4 years 7 months 6 days 4 years  
Expected volatility 27.00% 27.00% 26.00% 26.00%  
Employee Stock Option | Herman Miller Consumer Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Risk-free interest rate         2.29%
Expected term of options         1 year 29 days
Expected volatility         35.00%
Strike Price (usd per share)         $ 30.64
Per share value (usd per share)         $ 8.24