Fair Value Measurements Fair Value Measurements (Details) - USD ($)		1 Months Ended	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 12, 2017	Sep. 30, 2016	Nov. 30, 2019	Aug. 31, 2019	Dec. 01, 2018	Sep. 01, 2018	Nov. 30, 2019	Dec. 01, 2018	Nov. 28, 2020	Jun. 01, 2019
Derivative [Line Items]
Debt conversion rate		1.949%
Interest rate swaps			$ 3,400,000		$ 1,000,000.0		$ (5,300,000)	$ 500,000
Other Comprehensive Income (Loss), Net of Tax			17,800,000	$ (17,300,000)	(3,100,000)	$ (7,800,000)	500,000	(10,900,000)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			0		0		0	0
Other comprehensive income (loss), reclassification adjustment from aoci on derivatives, before tax			0		$ 100,000		100,000	0
Redeemable Noncontrolling Interest, Equity, Carrying Amount			0				0			$ 20,600,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners										5.00%
Payments to Acquire Additional Interest in Subsidiaries							20,300,000	10,100,000
Herman Miller Consumer Holdings
Derivative [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests							20,400,000
Interest rate swap agreement
Derivative [Line Items]
Derivative Liability, Notional Amount	$ 75,000,000.0	$ 150,000,000.0
Debt conversion rate	2.387%
Other Liabilities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Interest rate swap agreement
Derivative [Line Items]
Interest rate swap agreement - liability			$ 8,300,000				8,300,000			$ 2,200,000
Scenario, Forecast
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Gross Amount to be Transferred									$ 900,000
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred									$ 700,000
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Net of Tax							$ (5,300,000)	$ 500,000