v3.26.1
Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended
Dec. 10, 2025
Apr. 30, 2025
Jul. 04, 2026
Jun. 28, 2025
Jul. 04, 2026
Jun. 28, 2025
Jul. 04, 2026
Jan. 03, 2026
Business Combination [Line Items]                
Acquisition and related costs     $ 4.2 $ 0.0 $ 7.8 $ 0.0    
Goodwill measurement period adjustments         124.7      
Inventory         31.3 $ 0.0    
Discontinued Operations, Disposed of by Sale | HNI India                
Business Combination [Line Items]                
Consideration   $ 9.5            
Net of cash and transaction fees   8.1            
Pre-tax loss on the sale   6.5            
Foreign currency translation benefit   6.0            
Transaction-related expenses   $ 0.6            
Workplace furnishings                
Business Combination [Line Items]                
Goodwill measurement period adjustments         124.7      
Income Statement Location [Axis]: us-gaap:BusinessCombinationAcquisitionRelatedCosts                
Business Combination [Line Items]                
Acquisition and related costs             $ 102.4 $ 94.6
Income Statement Location [Axis]: us-gaap:BusinessCombinationAcquisitionRelatedCosts | General Corporate                
Business Combination [Line Items]                
Acquisition and related costs             93.8  
Income Statement Location [Axis]: us-gaap:BusinessCombinationAcquisitionRelatedCosts | Workplace furnishings                
Business Combination [Line Items]                
Acquisition and related costs             8.5  
Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNonoperatingNet                
Business Combination [Line Items]                
Acquisition and related costs             $ 9.5 9.5
Steelcase Inc                
Business Combination [Line Items]                
Total acquisition date fair value of purchase consideration $ 1,922.3              
Payment to acquire building 864.5              
Acquisition and related costs     11.3   19.9      
Purchase accounting adjustments     $ 21.9   86.1      
Steelcase Inc | Balance Sheet Location [Axis]: us-gaap:LongTermDebtNoncurrent                
Business Combination [Line Items]                
Capitalized transaction costs               12.0
Steelcase Inc | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent                
Business Combination [Line Items]                
Capitalized transaction costs               2.0
Steelcase Inc | Balance Sheet Location [Axis]: us-gaap:PrepaidExpenseAndOtherAssetsCurrent                
Business Combination [Line Items]                
Capitalized transaction costs               0.5
Steelcase Inc | Balance Sheet Location [Axis]: us-gaap:StockholdersEquity                
Business Combination [Line Items]                
Capitalized transaction costs               $ 2.1
Steelcase Inc | Workplace furnishings                
Business Combination [Line Items]                
Provisional valuation adjustments, intangibles         281.0      
Inventory         31.3      
Provisional valuation adjustments, deferred tax assets         (41.2)      
Provisional valuation adjustments, property, plant, and equipment         71.0      
Provisional valuation adjustments, other assets         85.2      
Recognized at the acquisition date         16.6      
Cost of sales         11.6      
Selling and administrative expenses         $ 5.0      
Steelcase Inc | Line of Credit                
Business Combination [Line Items]                
Borrowings 865.0              
Steelcase Inc | Common Stock                
Business Combination [Line Items]                
Fair value of total number of shares for cash consideration 1,012.5              
Common stock, fair value issued 826.8              
Steelcase Inc | Common stock equivalents excluded because their inclusion would be anti-dilutive                
Business Combination [Line Items]                
Fair value of total number of shares for cash consideration 45.4              
Steelcase Inc | Share-Based Awards For Services Provided                
Business Combination [Line Items]                
Common stock, fair value issued $ 37.6