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Revenue from Contracts with Customers - Schedule of Revenue Disaggregated By Product Type and Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Dec. 02, 2023	Nov. 30, 2024	Dec. 02, 2023
Disaggregation of Revenue [Line Items]
Net sales	$ 970.4	$ 949.5	$ 1,831.9	$ 1,867.2
Americas Contract | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	504.2	476.1	958.8	966.5
Americas Contract | Workplace | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	330.8	311.3	615.3	635.5
Americas Contract | Performance Seating | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	106.1	103.8	212.3	207.1
Americas Contract | Lifestyle | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	63.6	56.0	121.0	116.6
Americas Contract | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	3.7	5.0	10.2	7.3
International Contract & Specialty | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	246.3	241.2	459.8	469.5
International Contract & Specialty | Workplace | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	44.2	36.5	73.7	75.2
International Contract & Specialty | Performance Seating | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	70.8	64.3	126.0	116.9
International Contract & Specialty | Lifestyle | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	85.3	88.9	167.9	177.3
International Contract & Specialty | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	46.0	51.5	92.2	100.1
Global Retail | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	219.9	232.2	413.3	431.2
Global Retail | Workplace | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	2.1	3.3	4.7	7.5
Global Retail | Performance Seating | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	53.2	55.6	97.0	97.7
Global Retail | Lifestyle | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	164.3	172.9	311.0	325.4
Global Retail | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	$ 0.3	$ 0.4	$ 0.6	$ 0.6

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