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Restructuring and Integration Expense - Schedule of Restructuring Expenses by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Nov. 30, 2024
Dec. 02, 2023
Nov. 30, 2024
Dec. 02, 2023
Restructuring Cost and Reserve [Line Items]        
Restructuring expense $ 0 $ 1,800,000 $ 0 $ 7,000,000.0
Americas Contract        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense 0 0 0 4,300,000
International Contract & Specialty        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense 0 800,000 0 1,500,000
Global Retail        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense 0 1,000,000.0 0 1,200,000
Knoll Integration        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense 0 6,900,000 28,300,000 10,800,000
Knoll Integration | Corporate        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense 0 0 0 100,000
Knoll Integration | Americas Contract | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense 0 6,400,000 22,500,000 9,500,000
Knoll Integration | International Contract & Specialty | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense 0 500,000 5,500,000 1,200,000
Knoll Integration | Global Retail | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense $ 0 $ 0 $ 300,000 $ 0