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Acquisitions and Divestitures (Details) - USD ($) $ in Millions					3 Months Ended
	Aug. 31, 2018	Jun. 07, 2018	Jul. 31, 2017	Jan. 01, 2017	Sep. 01, 2018	Mar. 03, 2018	Sep. 02, 2017	Jun. 02, 2018
Business Acquisition [Line Items]
Payments to Acquire Intangible Assets					$ 4.8		$ 0.0
Proceeds from sale of property and dealers					0.0		2.0
MAARS [Member]
Business Acquisition [Line Items]
Purchase price	$ 6.1
Percentage of voting interests acquired	48.00%
Nine United Denmark A/S [Member]
Business Acquisition [Line Items]
Purchase price		$ 65.5
Percentage of voting interests acquired		33.00%
Payments to Acquire Intangible Assets		$ 4.8
CANADA | Wholly-owned contract furniture dealership [Member]
Business Acquisition [Line Items]
(Gain) loss on sales of property and dealers							$ 1.1
Proceeds from sale of property and dealers			$ 2.0
PENNSYLVANIA | Wholly-owned contract furniture dealership [Member]
Business Acquisition [Line Items]
(Gain) loss on sales of property and dealers						$ 0.7
Proceeds from sale of property and dealers				$ 3.0
Accounts and Notes Receivable, Net					$ 2.5			$ 2.5

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Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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