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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
Aug. 30, 2025
Aug. 31, 2024
Disaggregation of Revenue [Line Items]    
Net sales $ 955.7 $ 861.5
Workplace    
Disaggregation of Revenue [Line Items]    
Net sales 373.6 316.6
Performance Seating    
Disaggregation of Revenue [Line Items]    
Net sales 222.1 205.2
Lifestyle    
Disaggregation of Revenue [Line Items]    
Net sales 304.1 286.7
Other    
Disaggregation of Revenue [Line Items]    
Net sales 55.9 53.0
Operating Segments | North America Contract    
Disaggregation of Revenue [Line Items]    
Net sales 533.9 476.2
Operating Segments | International Contract    
Disaggregation of Revenue [Line Items]    
Net sales 167.5 146.4
Operating Segments | Global Retail    
Disaggregation of Revenue [Line Items]    
Net sales 254.3 238.9
Operating Segments | Workplace | North America Contract    
Disaggregation of Revenue [Line Items]    
Net sales 327.1 279.0
Operating Segments | Workplace | International Contract    
Disaggregation of Revenue [Line Items]    
Net sales 44.5 35.0
Operating Segments | Workplace | Global Retail    
Disaggregation of Revenue [Line Items]    
Net sales 2.0 2.6
Operating Segments | Performance Seating | North America Contract    
Disaggregation of Revenue [Line Items]    
Net sales 103.4 94.0
Operating Segments | Performance Seating | International Contract    
Disaggregation of Revenue [Line Items]    
Net sales 73.1 67.4
Operating Segments | Performance Seating | Global Retail    
Disaggregation of Revenue [Line Items]    
Net sales 45.6 43.8
Operating Segments | Lifestyle | North America Contract    
Disaggregation of Revenue [Line Items]    
Net sales 56.1 55.6
Operating Segments | Lifestyle | International Contract    
Disaggregation of Revenue [Line Items]    
Net sales 41.9 38.9
Operating Segments | Lifestyle | Global Retail    
Disaggregation of Revenue [Line Items]    
Net sales 206.1 192.2
Operating Segments | Other | North America Contract    
Disaggregation of Revenue [Line Items]    
Net sales 47.3 47.6
Operating Segments | Other | International Contract    
Disaggregation of Revenue [Line Items]    
Net sales 8.0 5.1
Operating Segments | Other | Global Retail    
Disaggregation of Revenue [Line Items]    
Net sales $ 0.6 $ 0.3