Restructuring and Integration Expense - Summary of Restructuring Expenses by Segment (Details) - USD ($)	12 Months Ended
	May 28, 2022	May 29, 2021	May 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 0	$ 2,700,000	$ 26,400,000
Knoll Integration
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	107,900,000	0
America's Contract
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0	3,800,000
America's Contract \| Knoll Integration
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	5,100,000	0
International Contract
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0	(1,100,000)
International Contract \| Knoll Integration
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,100,000	0
Global Retail
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0
Global Retail \| Knoll Integration
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	500,000	0
Knoll
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0	0
Knoll \| Knoll Integration
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	60,300,000	0
Corporate \| Knoll Integration
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 40,900,000	$ 0