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. 29, 2025	Nov. 30, 2024	Nov. 29, 2025	Nov. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 955.2	$ 970.4	$ 1,910.9	$ 1,831.9
Workplace
Disaggregation of Revenue [Line Items]
Net sales	356.7	377.1	730.3	693.7
Performance Seating
Disaggregation of Revenue [Line Items]
Net sales	229.7	230.1	451.8	435.3
Lifestyle
Disaggregation of Revenue [Line Items]
Net sales	316.1	313.2	620.2	599.9
Other
Disaggregation of Revenue [Line Items]
Net sales	52.7	50.0	108.6	103.0
Operating Segments \| North America Contract
Disaggregation of Revenue [Line Items]
Net sales	508.5	524.7	1,042.4	1,000.9
Operating Segments \| International Contract
Disaggregation of Revenue [Line Items]
Net sales	170.9	182.4	338.4	328.8
Operating Segments \| Global Retail
Disaggregation of Revenue [Line Items]
Net sales	275.8	263.3	530.1	502.2
Operating Segments \| Workplace \| North America Contract
Disaggregation of Revenue [Line Items]
Net sales	309.9	324.0	637.0	603.0
Operating Segments \| Workplace \| International Contract
Disaggregation of Revenue [Line Items]
Net sales	44.7	51.0	89.2	86.0
Operating Segments \| Workplace \| Global Retail
Disaggregation of Revenue [Line Items]
Net sales	2.1	2.1	4.1	4.7
Operating Segments \| Performance Seating \| North America Contract
Disaggregation of Revenue [Line Items]
Net sales	101.1	96.0	204.5	190.0
Operating Segments \| Performance Seating \| International Contract
Disaggregation of Revenue [Line Items]
Net sales	72.3	80.9	145.4	148.3
Operating Segments \| Performance Seating \| Global Retail
Disaggregation of Revenue [Line Items]
Net sales	56.3	53.2	101.9	97.0
Operating Segments \| Lifestyle \| North America Contract
Disaggregation of Revenue [Line Items]
Net sales	52.9	61.2	109.0	116.8
Operating Segments \| Lifestyle \| International Contract
Disaggregation of Revenue [Line Items]
Net sales	46.3	44.3	88.2	83.2
Operating Segments \| Lifestyle \| Global Retail
Disaggregation of Revenue [Line Items]
Net sales	216.9	207.7	423.0	399.9
Operating Segments \| Other \| North America Contract
Disaggregation of Revenue [Line Items]
Net sales	44.6	43.5	91.9	91.1
Operating Segments \| Other \| International Contract
Disaggregation of Revenue [Line Items]
Net sales	7.6	6.2	15.6	11.3
Operating Segments \| Other \| Global Retail
Disaggregation of Revenue [Line Items]
Net sales	$ 0.5	$ 0.3	$ 1.1	$ 0.6