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Restructuring and Integration Expense - Schedule of Severance and Employee Benefit Costs (Details) - USD ($)
 12 Months Ended
May 28, 2022
May 29, 2021
May 30, 2020
Restructuring Cost and Reserve [Line Items]      
Integration Costs $ 0 $ 2,700,000 $ 26,400,000
Knoll Integration      
Restructuring Cost and Reserve [Line Items]      
Integration Costs 107,900,000 0  
Knoll Integration | Severance and Employee Benefit      
Restructuring Cost and Reserve [Line Items]      
Beginning balance 0    
Integration Costs 51,100,000    
Amounts Paid (35,200,000)    
Non-cash costs (14,500,000)    
Ending balance 1,400,000 0  
Knoll Integration | Exit and Disposal Activities      
Restructuring Cost and Reserve [Line Items]      
Beginning balance 0    
Integration Costs 15,500,000    
Amounts Paid 0    
Non-cash costs (15,500,000)    
Ending balance 0 0  
Knoll Integration | Severance And Employee Benefits And Exit And Disposal Activities      
Restructuring Cost and Reserve [Line Items]      
Beginning balance 0    
Integration Costs 66,600,000    
Amounts Paid (35,200,000)    
Non-cash costs (30,000,000.0)    
Ending balance $ 1,400,000 $ 0