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Restructuring and Integration Expense - Additional Information (Details)	3 Months Ended			6 Months Ended		12 Months Ended			45 Months Ended
	Nov. 27, 2021 USD ($) position	Aug. 28, 2021 USD ($)	Nov. 28, 2020 USD ($)	Nov. 27, 2021 USD ($) position	Nov. 28, 2020 USD ($)	May 29, 2021 USD ($)	May 30, 2020 USD ($)	Jun. 01, 2019 USD ($)	Feb. 27, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 0		$ 2,400,000	$ 0	$ 1,200,000
Gain on disposition of assets		$ 3,400,000
Knoll
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0		0	0	0
International Contract
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0		1,600,000	0	(1,200,000)
Americas Contract
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0		800,000	0	2,400,000
Global Retail
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0		0	0	0
Knoll Integration
Restructuring Cost and Reserve [Line Items]
Restructuring expense	24,600,000		0	95,800,000	0
Knoll Integration | Severance and Employee Benefit
Restructuring Cost and Reserve [Line Items]
Restructuring expense				46,400,000
Knoll Integration | Exit and Disposal Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expense				15,500,000
Knoll Integration | Non-Cash Debt Extinguishment Member
Restructuring Cost and Reserve [Line Items]
Restructuring expense				13,400,000
Knoll Integration | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense				20,500,000
Knoll Integration | Knoll
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	100,000,000			100,000,000
Restructuring expense	11,600,000		0	56,500,000	0
Knoll Integration | International Contract
Restructuring Cost and Reserve [Line Items]
Restructuring expense	600,000		0	600,000	0
Knoll Integration | Americas Contract
Restructuring Cost and Reserve [Line Items]
Restructuring expense	3,400,000		0	4,400,000	0
Knoll Integration | Global Retail
Restructuring Cost and Reserve [Line Items]
Restructuring expense	500,000		$ 0	500,000	$ 0
Facilities Consolidation Plan | International Contract | Exit and Disposal Activities
Restructuring Cost and Reserve [Line Items]
Cost savings				3,000,000
Restructuring costs and asset impairment charges				1,900,000		$ 1,900,000	$ 1,900,000	$ 1,900,000	$ 5,900,000
Restructuring and related cost, expected cost remaining	0			0
Nemschoff Plan | Americas Contract
Restructuring Cost and Reserve [Line Items]
Restructuring expense				100,000
Restructuring and related cost, expected cost remaining	0			0
Restructuring expenses	3,100,000			3,100,000
North American Sales and Global Product Teams Plan | Americas Contract
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	0			0
North American Sales and Global Product Teams Plan | Global Retail
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges									$ 2,600,000
May 2020 Restructuring Plan | Severance and Employee Benefit
Restructuring Cost and Reserve [Line Items]
Restructuring expense				0		$ 3,400,000
Cost savings				40,000,000
Restructuring expenses	$ 18,700,000			$ 18,700,000
Number of full-time positions eliminated | position	400			400

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