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ACQUISITIONS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 03, 2018
Jan. 26, 2018
Jul. 31, 2017
Apr. 30, 2016
Sep. 29, 2018
Sep. 29, 2018
Dec. 30, 2017
Jan. 31, 2019
Business Acquisition [Line Items]                
Goodwill         $ 389,594 $ 389,594 $ 337,720  
Walpar, LLC [Member]                
Business Acquisition [Line Items]                
Percentage acquired 72.00%              
Consideration transfered $ 57,805              
Goodwill $ 40,919              
Convert Italia S.p.A                
Business Acquisition [Line Items]                
Percentage acquired 75.00%              
Consideration transfered $ 43,504              
Contingent consideration liability 18,760              
Goodwill 41,432              
Derit Infrastructure Pvt. Ltd. [Member]                
Business Acquisition [Line Items]                
Consideration transfered $ 14,700              
Torrent Engineering and Equipment                
Business Acquisition [Line Items]                
Percentage acquired   60.00%            
Consideration transfered   $ 4,800            
Goodwill   3,922            
Annual revenue of acquiree   9,000            
Customer relationships and other intangible assets   $ 4,020            
Aircon                
Business Acquisition [Line Items]                
Consideration transfered     $ 5,362          
Goodwill     3,327          
Annual revenue of acquiree     10,000          
Customer relationships and other intangible assets     $ 2,109          
Walpart, Convert, and Torrent [Member]                
Business Acquisition [Line Items]                
Revenue of acquiree since acquisition         11,803 13,057    
Net earnings of acquiree since acquisition         $ 1,198 $ 1,055    
IGC Galvanizing Industries (M) Sdn Bhd [Member]                
Business Acquisition [Line Items]                
Percentage acquired       10.00%        
Consideration transfered       $ 5,510        
Scenario, Forecast [Member] | Walpar, LLC [Member]                
Business Acquisition [Line Items]                
Percentage acquired               28.00%
Customer Relationships                
Business Acquisition [Line Items]                
Finite-Lived Intangible Asset, Useful Life           13 years 13 years  
Customer Relationships | Walpar, LLC [Member]                
Business Acquisition [Line Items]                
Finite-Lived Intangible Asset, Useful Life 14 years              
Patents & Proprietary Technology                
Business Acquisition [Line Items]                
Finite-Lived Intangible Asset, Useful Life           14 years 11 years  
Patents & Proprietary Technology | Convert Italia S.p.A                
Business Acquisition [Line Items]                
Finite-Lived Intangible Asset, Useful Life 15 years