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ACQUISITIONS AND DISCONTINUED OPERATIONS - Narrative (Details)
 3 Months Ended 6 Months Ended
Mar. 27, 2026
USD ($)
Feb. 06, 2026
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Jan. 20, 2026
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Apr. 15, 2025
USD ($)
Jan. 27, 2025
USD ($)
Jun. 27, 2026
USD ($)
Dec. 31, 2025
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Sep. 27, 2025
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Jun. 28, 2025
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Dec. 31, 2021
project
Jun. 27, 2026
USD ($)
Jun. 28, 2025
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Disposal Group, Including Discontinued Operations [Line Items]                        
Business acquisition, net of cash acquired                     $ 439,600,000 $ 447,700,000
Net income (loss)           $ 78,400,000     $ 52,200,000   138,300,000 103,400,000
Selling, general and administrative — intangible amortization           27,200,000     24,600,000   51,400,000 44,300,000
Amortization of deferred compensation plan asset                     6,300,000 10,900,000
Acquisition-related costs           4,600,000     8,300,000   12,300,000 16,900,000
Loss on disposition of discontinued operation, net of tax           900,000     300,000   7,000,000.0 800,000
Discontinued Operations, Disposed of by Sale | Crawford United Corporation Non-Core Businesses                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Aggregate cash proceeds $ 60,000,000.0                      
Cash proceeds 59,200,000                      
Discontinued operation, cash 1,400,000                      
Discontinued operation debt contributed 2,200,000                      
Loss on disposition of discontinued operation, net of tax $ 5,700,000                      
Discontinued Operations | DBT Technologies                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Total assets - discontinued operations           5,500,000 $ 5,800,000       5,500,000  
Total liabilities of DBT           14,200,000 14,100,000       14,200,000  
Number of large power projects | project                   2    
Discontinued Operations | Heat Transfer                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Total assets - discontinued operations           300,000         300,000  
Total liabilities of DBT             0.0          
Sigma & Omega                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Receivables, fair value       $ 9,200,000                
Crawford United Corporation                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Receivables, fair value   $ 12,700,000                    
Crawford United Corporation                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Business acquisition, net of cash acquired   299,400,000                    
Cash acquired   600,000                    
Intangible assets   128,100,000                    
Gross amount of receivables acquired   12,800,000                    
Goodwill, expected tax deductible amount   0                    
Revenues           23,600,000         36,700,000  
Net income (loss)           1,000,000.0         600,000  
Selling, general and administrative — intangible amortization           7,000,000.0         11,500,000  
Inventory write-down                     100,000  
Crawford United Corporation | Customer relationships and contracts                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets   $ 81,800,000                    
Amortization period   11 years                    
Crawford United Corporation | Technology                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets   $ 17,700,000                    
Amortization period   12 years                    
Crawford United Corporation | Trademarks with indefinite lives                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets   $ 14,700,000                    
Amortization period   11 years                    
Crawford United Corporation | Customer Backlog                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets   $ 13,900,000                    
Amortization period   1 year                    
Thermolec Ltd                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Business acquisition, net of cash acquired     $ 140,200,000                  
Cash acquired     1,300,000                  
Intangible assets     79,400,000                  
Gross amount of receivables acquired     4,000,000.0                  
Goodwill, expected tax deductible amount     0                  
Revenues           8,400,000         15,800,000  
Net income (loss)           900,000         1,600,000  
Selling, general and administrative — intangible amortization           1,700,000         2,800,000  
Inventory write-down                     400,000  
Thermolec Ltd | Customer relationships and contracts                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets     $ 64,300,000                  
Amortization period     12 years                  
Thermolec Ltd | Technology                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets     $ 8,200,000                  
Amortization period     12 years                  
Thermolec Ltd | Trademarks with indefinite lives                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets     $ 6,900,000                  
Amortization period     15 years                  
Sigma & Omega                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Business acquisition, net of cash acquired       143,300,000                
Cash acquired       200,000                
Intangible assets       77,600,000                
Gross amount of receivables acquired       9,600,000                
Goodwill, expected tax deductible amount       0                
Revenues           15,100,000         15,100,000  
Net income (loss)           (400,000)         (400,000)  
Selling, general and administrative — intangible amortization           4,400,000         4,400,000  
Working capital acquired from acquisition             300,000          
Sigma & Omega | Customer relationships and contracts                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets       $ 56,300,000                
Amortization period       11 years                
Sigma & Omega | Technology                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets       $ 8,500,000                
Amortization period       9 years                
Sigma & Omega | Trademarks with indefinite lives                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets       $ 3,900,000                
Amortization period       8 years                
Sigma & Omega | Customer Backlog                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets       $ 8,900,000                
Amortization period       1 year                
Kranze Technology Solutions, Inc                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Business acquisition, net of cash acquired         $ 340,000,000.0              
Intangible assets         164,500,000              
Gross amount of receivables acquired         7,200,000              
Revenues                 21,600,000     30,100,000
Net income (loss)                 (2,500,000)     (8,900,000)
Selling, general and administrative — intangible amortization                 6,000,000.0     9,200,000
Inventory write-down                 500,000     800,000
Deferred compensation plan assets         46,500,000              
Working capital acquired from acquisition               $ 2,400,000        
Kranze Technology Solutions, Inc | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Deferred compensation plan assets         26,200,000              
Kranze Technology Solutions, Inc | Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Deferred compensation plan assets           6,900,000 11,400,000       6,900,000  
Kranze Technology Solutions, Inc | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Deferred compensation plan assets         $ 20,300,000 9,100,000 $ 10,900,000       9,100,000  
Kranze Technology Solutions, Inc | Retention Agreements                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Amortization of deferred compensation plan asset           $ 2,700,000     $ 6,600,000   $ 6,300,000 10,900,000
Kranze Technology Solutions, Inc | Minimum                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Employee retention agreement term         2 years              
Kranze Technology Solutions, Inc | Maximum                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Employee retention agreement term         8 years              
Kranze Technology Solutions, Inc | Customer relationships and contracts                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets         $ 70,700,000              
Amortization period         15 years              
Kranze Technology Solutions, Inc | Technology                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets         $ 79,800,000              
Amortization period         12 years              
Kranze Technology Solutions, Inc | Trademarks with indefinite lives                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets         $ 6,700,000              
Amortization period         9 years              
Kranze Technology Solutions, Inc | Customer Backlog                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Intangible assets         $ 7,300,000              
Amortization period         2 years              
HVAC reportable segment                        
Disposal Group, Including Discontinued Operations [Line Items]                        
Business acquisition, net of cash acquired                       $ 8,200,000